LT3060 Series
1
3060fc
For more information www.linear.com/LT3060
Typical applicaTion
DescripTion
45V VIN, Micropower,
Low Noise, 100mA Low
Dropout, Linear Regulator
The LT
®
3060 series are micropower, low dropout voltage
(LDO) linear regulators that operate over a 1.6V to 45V
input supply range. The devices supply 100mA of output
current with a typical dropout voltage of 300mV. A single
external capacitor provides programmable low noise
reference performance and output soft-start functional-
ity. The LT3060’s quiescent current is merely 40μA and
provides fast transient response with a minimum 2.2μF
output capacitor. In shutdown, quiescent current is less
than 1μA and the reference soft-start capacitor is reset.
The LT3060 regulators optimize stability and transient
response with low ESR, ceramic output capacitors.
The regulators do not require the addition of ESR as is
common with other regulators.
Internal protection circuitry includes reverse-battery
protection, reverse-output protection, reverse-current
protection, current limit with foldback and thermal
shutdown. The LT3060 series are available in fixed output
voltages of 1.2V
, 1.5V, 1.8V, 2.5V
, 3.3V, 5V and 15V, and as
an adjustable voltage regulator with an output voltage range
from the 600mV reference to 44.5V. The LT3060 regulators
are offered in the thermally enhanced 8-lead TSOT-23 and
8-lead (2mm × 2mm × 0.75mm) DFN packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
2.5V Low Noise Regulator
FeaTures
applicaTions
n Input Voltage Range: 1.6V to 45V
n Output Current: 100mA
n Quiescent Current: 40µA
n Dropout Voltage: 300mV
n Low Noise: 30µVRMS (10Hz to 100kHz)
n Adjustable Output: VREF = 600mV
n Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V,
5V, 15V
n Output Tolerance: ±2% Over Line, Load and
Temperature
n Single Capacitor Soft-Starts Reference and Lowers
Output Noise
n Shutdown Current: < 1µA
n Reverse Battery Protection
n Current Limit Foldback Protection
n Thermal Limit Protection
n 8-Lead 2mm × 2mm × 0.75mm DFN and 8-Lead
ThinSOT™ Packages
n Battery-Powered Systems
n Automotive Power Supplies
n Industrial Power Supplies
n Avionic Power Supplies
n Portable Instruments
3060 TA01
IN
SHDN
OUT
ADJ
GND REF/BYP
LT3060-2.5
VIN
3V TO
45V
VOUT
2.5V AT 100mA
30µVRMS NOISE
1µF 10µF
CFF
10nF
10nF
Dropout Voltage
OUTPUT CURRENT (mA)
0
0
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
350
10 60 70 80 90 10020 30 40
3060 TA02
50
TJ = 25°C
LT3060 Series
2
3060fc
For more information www.linear.com/LT3060
absoluTe MaxiMuM raTings
IN Pin Voltage ........................................................ ±50V
OUT Pin Voltage ..................................................... ±50V
Input-to-Output Differential Voltage (Note 2) ......... ±50V
ADJ Pin Voltage ..................................................... ±50V
SHDN Pin Voltage .................................................. ±50V
REF/BYP Pin Voltage ....................................... – 0.3V, 1V
(Note 1)
TOP VIEW
REF/BYP
ADJ
OUT
OUT
GND
SHDN
IN
IN
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
9
GND
4
1
2
36
5
7
8
TJMAX = 125°C, θJA = 48°C/W TO 60°C/W*, θJC = 20°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
SHDN 1
GND 2
GND 3
GND 4
8 REF/BYP
7 ADJ
6 OUT
5 IN
TOP VIEW
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
TJMAX = 150°C, θJA = 57°C/W TO 67°C/W*, θJC = 25°C/W
* SEE APPLICATIONS INFORMATION SECTION
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3060EDC#PBF LT3060EDC#TRPBF LDTD 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC#PBF LT3060IDC#TRPBF LDTD 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-1.2#PBF LT3060EDC-1.2#TRPBF LFVT 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-1.2#PBF LT3060IDC-1.2#TRPBF LFVT 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-1.5#PBF LT3060EDC-1.5#TRPBF LFVV 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-1.5#PBF LT3060IDC-1.5#TRPBF LFVV 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-1.8#PBF LT3060EDC-1.8#TRPBF LFVW 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-1.8#PBF LT3060IDC-1.8#TRPBF LFVW 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-2.5#PBF LT3060EDC-2.5#TRPBF LFVX 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-2.5#PBF LT3060IDC-2.5#TRPBF LFVX 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-3.3#PBF LT3060EDC-3.3#TRPBF LFVY 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-3.3#PBF LT3060IDC-3.3#TRPBF LFVY 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-5#PBF LT3060EDC-5#TRPBF LFVZ 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-5#PBF LT3060IDC-5#TRPBF LFVZ 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060EDC-15#PBF LT3060EDC-15#TRPBF LGSK 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
LT3060IDC-15#PBF LT3060IDC-15#TRPBF LGSK 8-Lead (2mm × 2mm) Plastic DFN –40°C to 125°C
Output Short-Circuit Duration .......................... Indefinite
Operating Junction Temperature (Notes 3, 5, 13)
E-, I-Grades .......................................–40°C to 125°C
MP-Grade .......................................... –55°C to 150°C
H-Grade ............................................. –40°C to 150°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (TS8 Soldering, 10 sec) ...........300°C
LT3060 Series
3
3060fc
For more information www.linear.com/LT3060
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3060ETS8#PBF LT3060ETS8#TRPBF LTDTF 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8#PBF LT3060ITS8#TRPBF LTDTF 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8#PBF LT3060MPTS8#TRPBF LTDTF 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8#PBF LT3060HTS8#TRPBF LTDTF 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-1.2#PBF LT3060ETS8-1.2#TRPBF LTFWB 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-1.2#PBF LT3060ITS8-1.2#TRPBF LTFWB 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-1.2#PBF LT3060MPTS8-1.2#TRPBF LTFWB 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-1.2#PBF LT3060HTS8-1.2#TRPBF LTFWB 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-1.5#PBF LT3060ETS8-1.5#TRPBF LTFWC 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-1.5#PBF LT3060ITS8-1.5#TRPBF LTFWC 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-1.5#PBF LT3060MPTS8-1.5#TRPBF LTFWC 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-1.5#PBF LT3060HTS8-1.5#TRPBF LTFWC 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-1.8#PBF LT3060ETS8-1.8#TRPBF LTFWD 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-1.8#PBF LT3060ITS8-1.8#TRPBF LTFWD 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-1.8#PBF LT3060MPTS8-1.8#TRPBF LTFWD 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-1.8#PBF LT3060HTS8-1.8#TRPBF LTFWD 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-2.5#PBF LT3060ETS8-2.5#TRPBF LTFWF 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-2.5#PBF LT3060ITS8-2.5#TRPBF LTFWF 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-2.5#PBF LT3060MPTS8-2.5#TRPBF LTFWF 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-2.5#PBF LT3060HTS8-2.5#TRPBF LTFWF 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-3.3#PBF LT3060ETS8-3.3#TRPBF LTFWG 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-3.3#PBF LT3060ITS8-3.3#TRPBF LTFWG 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-3.3#PBF LT3060MPTS8-3.3#TRPBF LTFWG 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-3.3#PBF LT3060HTS8-3.3#TRPBF LTFWG 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-5#PBF LT3060ETS8-5#TRPBF LTFWH 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-5#PBF LT3060ITS8-5#TRPBF LTFWH 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-5#PBF LT3060MPTS8-5#TRPBF LTFWH 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-5#PBF LT3060HTS8-5#TRPBF LTFWH 8-Lead Plastic ThinSOT –40°C to 150°C
LT3060ETS8-15#PBF LT3060ETS8-15#TRPBF LTGSM 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060ITS8-15#PBF LT3060ITS8-15#TRPBF LTGSM 8-Lead Plastic ThinSOT –40°C to 125°C
LT3060MPTS8-15#PBF LT3060MPTS8-15#TRPBF LTGSM 8-Lead Plastic ThinSOT –55°C to 150°C
LT3060HTS8-15#PBF LT3060HTS8-15#TRPBF LTGSM 8-Lead Plastic ThinSOT –40°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
orDer inForMaTion
LT3060 Series
4
3060fc
For more information www.linear.com/LT3060
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage
(Notes 4, 12)
ILOAD = 100mA l1.6 2.1 V
Regulated Output Voltage
(Note 5)
LT3060-1.2: VIN = 2.1V, ILOAD = 1mA
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
1.188
1.176
1.170
1.2
1.2
1.2
1.212
1.224
1.224
V
V
V
LT3060-1.5: VIN = 2.1V, ILOAD = 1mA
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
1.485
1.470
1.463
1.5
1.5
1.5
1.515
1.530
1.530
V
V
V
LT3060-1.8: VIN = 2.35V, ILOAD = 1mA
2.35V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
2.35V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
1.782
1.764
1.755
1.8
1.8
1.8
1.818
1.836
1.836
V
V
V
LT3060-2.5: VIN = 3.05V, ILOAD = 1mA
3.05V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
3.05V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
2.475
2.450
2.438
2.5
2.5
2.5
2.525
2.550
2.550
V
V
V
LT3060-3.3: VIN = 3.85V, ILOAD = 1mA
3.85V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
3.85V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
3.267
3.234
3.218
3.3
3.3
3.3
3.333
3.366
3.366
V
V
V
LT3060-5: VIN = 5.55V, ILOAD = 1mA
5.55V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
5.55V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
4.950
4.900
4.875
5
5
5
5.050
5.100
5.100
V
V
V
LT3060-15: VIN = 15.55V, ILOAD = 1mA
15.55V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
15.55V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
14.85
14.70
14.63
15
15
15
15.15
15.30
15.30
V
V
V
ADJ Pin Voltage
(Notes 4, 5)
LT3060: VIN = 2.1V, ILOAD = 1mA
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (E-, I-Grades)
2.1V < VIN < 45V, 1mA < ILOAD < 100mA (MP-, H-Grades)
l
l
594
588
585
600
600
600
606
612
612
mV
mV
mV
Line Regulation LT3060-1.2: ΔVIN = 2.1V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 2.1V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
0.9 3.5
7
mV
LT3060-1.5: ΔVIN = 2.1V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 2.1V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
1 4.2
8
mV
LT3060-1.8: ΔVIN = 2.35V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 2.35V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
1.1 4.5
12
mV
LT3060-2.5: ΔVIN = 3.05V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 3.05V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
1.2 5.4
15
mV
LT3060-3.3: ΔVIN = 3.85V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 3.85V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
1.3 7
19
mV
LT3060-5: ΔVIN = 5.55V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 5.55V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
1.5 8.5
25
mV
LT3060-15: ΔVIN = 15.55V to 45V, ILOAD = 1mA (E-, I-Grades)
ΔVIN = 15.55V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
2.2 22
55
mV
LT3060: ΔVIN = 2.1V to 45V, ILOAD = 1mA (E-, I-Grades)
(Note 4) ΔVIN = 2.1V to 45V, ILOAD = 1mA (MP-, H-Grades)
l
l
0.6 3.5
4
mV
LT3060 Series
5
3060fc
For more information www.linear.com/LT3060
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Load Regulation
(Note 15)
LT3060-1.2: VIN = 2.1V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 2.1V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
2.4 10
18
mV
mV
LT3060-1.5: VIN = 2.1V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 2.1V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
2.5 12
22
mV
mV
LT3060-1.8: VIN = 2.35V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 2.35V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
2.6 14
27
mV
mV
LT3060-2.5: VIN = 3.05V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 3.05V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
2.8 19
37
mV
mV
LT3060-3.3: VIN = 3.85V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 3.85V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
3.1 24
49
mV
mV
LT3060-5: VIN = 5.55V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 5.55V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
3.7 35
75
mV
mV
LT3060-15: VIN = 15.55V, ILOAD = 1mA to 100mA (E-, I-Grades)
VIN = 15.55V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
7 100
225
mV
mV
LT3060: VIN = 2.1V, ILOAD = 1mA to 100mA (E-, I-Grades)
(Note 4) VIN = 2.1V, ILOAD = 1mA to 100mA (MP-, H-Grades)
l
l
0.2 4
9
mV
mV
Dropout Voltage
VIN = VOUT(NOMINAL)
(Notes 6, 7)
ILOAD = 1mA
ILOAD = 1mA
l
75 110
180
mV
mV
ILOAD = 10mA
ILOAD = 10mA
l
150 200
300
mV
mV
ILOAD = 50mA (Note 14)
ILOAD = 50mA (Note 14)
l
240 280
410
mV
mV
ILOAD = 100mA (Note 14)
ILOAD = 100mA (Note 14)
l
300 350
510
mV
mV
GND Pin Current
VIN = VOUT(NOMINAL) +
0.55V
(Notes 6, 8)
ILOAD = 0µA
ILOAD = 1mA
ILOAD = 10mA
ILOAD = 50mA
ILOAD = 100mA
l
l
l
l
l
40
60
160
0.8
2
80
100
350
1.8
4
µA
µA
µA
mA
mA
Quiescent Current in
Shutdown
VIN = 45V, VSHDN = 0V 0.3 1 µA
ADJ Pin Bias Current
(Note 9)
VIN = 2.1V l15 60 nA
Output Voltage Noise COUT = 10µF, ILOAD = 100mA, CBYP = 0.01µF
VOUT = 600mV, BW = 10Hz to 100kHz
30 µVRMS
Shutdown Threshold VOUT = Off to On
VOUT = On to Off
l
l
0.3
0.8
0.7
1.5 V
V
SHDN Pin Current
(Note 10)
VSHDN = 0V
VSHDN = 45V
l
l
0.9
1
3
µA
µA
Ripple Rejection
VRIPPLE = 0.5VP-P,
fRIPPLE = 120Hz,
ILOAD = 100mA
LT3060-1.2: VIN = 2.7V (Avg) 64 79 dB
LT3060-1.5: VIN = 3V (Avg) 62 77 dB
LT3060-1.8: VIN = 3.3V (Avg) 60 75 dB
LT3060-2.5: VIN = 4V (Avg) 58 73 dB
LT3060-3.3: VIN = 4.8V (Avg) 55 70 dB
LT3060-5: VIN = 6.5V (Avg) 52 67 dB
LT3060-15: VIN = 16.5V (Avg) 45 60 dB
LT3060: VIN = 2.1V (Avg) (Note 4) 70 85 dB
Current Limit VIN = 7V, VOUT = 0
VIN = VOUT(NOMINAL) + 1V (Notes 6, 12), ΔVOUT = –5%
l
110
200 mA
mA
LT3060 Series
6
3060fc
For more information www.linear.com/LT3060
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Absolute maximum input-to-output differential voltage is not
achievable with all combinations of rated IN pin and OUT pin voltages.
With the IN pin at 50V, the OUT pin may not be pulled below 0V. The total
measured voltage from IN to OUT must not exceed ±50V. If OUT is above
ground, do not actively pull OUT above IN by more than 40V.
Note 3: The LT3060 regulators are tested and specified under pulse load
conditions such that TJ ≅ TA. The LT3060E regulators are 100% tested
at TA = 25°C. Performance at –40°C to 125°C is assured by design,
characterization and correlation with statistical process controls. The
LT3060I regulators are guaranteed over the full –40°C to 125°C operating
junction temperature range. The LT3060MP regulators are 100% tested
over the –55°C to 150°C operating junction temperature range. The
LT3060H regulators are 100% tested at the 150°C operating junction
temperature. High junction temperatures degrade operating lifetimes.
Operating lifetime is derated at junction temperatures greater than 125°C.
Note 4: The LT3060 adjustable version is tested and specified for these
conditions with the ADJ connected to the OUT pin.
Note 5: Maximum junction temperature limits operating conditions. The
regulated output voltage specification does not apply for all possible
combinations of input voltage and output current. Limit the output current
range if operating at the maximum input-to-output voltage differential.
Limit the input-to-output voltage differential if operating at maximum
output current. Current limit foldback will limit the maximum output
current as a function of input-to-output voltage. See Current Limit vs
VIN – VOUT in the Typical Performance Characteristics section.
Note 6: To satisfy minimum input voltage requirements, the LT3060
adjustable version is tested and specified for these conditions with an
external resistor divider (bottom 115k, top 365k) for an output voltage of
2.5V. The external resistor divider adds 5µA of DC load on the output. This
external current is not factored into GND pin current.
Note 7: Dropout voltage is the minimum input-to-output voltage
differential needed to maintain regulation at a specified output current.
In dropout, the output voltage equals: (VIN – VDROPOUT). For the
LT3060, LT3060-1.2, LT3060-1.5 and LT3060-1.8, dropout is limited
by the minimum input specification under some output voltages and
load conditions. See the Minimum Input Voltage curve in the Typical
Performance Characteristics section.
Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.55V and a
current source load. GND pin current will increase in dropout. See GND pin
current curves in the Typical Performance Characteristics section.
Note 9: ADJ pin bias current flows out of the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin.
Note 11: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out of the GND pin.
Note 12: To satisfy requirements for minimum input voltage, current
limit is tested at VIN = VOUT(NOMINAL) + 1V or VIN = 2.1V, whichever is
greater.
Note 13: This IC includes overtemperature protection that protects the
device during momentary overload conditions. Junction temperature
will exceed 125°C (LT3060E, LT3060I) or 150°C (LT3060MP, LT3060H)
when overtemperature circuitry is active. Continuous operation above the
specified maximum junction temperature may impair device reliability.
Note 14: The dropout voltage specification is guaranteed for the DFN
package. The dropout voltage specification for high output currents cannot
be guaranteed for the TS8 package due to production test limitations.
Note 15: The load regulation specification is guaranteed for the fixed
voltage options in the DFN package. The load regulation specification
cannot be guaranteed for the fixed voltage options in the TS8 package due
to production test limitations. The TS8 packages are tested similarly to the
LT3060 adjustable version with the ADJ connected to the OUT pin.
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Reverse Leakage
Current
VIN = –45V, VOUT = 0 l300 µA
Reverse Output Current
(Note 11) LT3060-1.2: VOUT = 1.2V, VIN = 0V 5 10 µA
LT3060-1.5: VOUT = 1.5V, VIN = 0V 5 10 µA
LT3060-1.8: VOUT = 1.8V, VIN = 0V 5 10 µA
LT3060-2.5: VOUT = 2.5V, VIN = 0V 5 10 µA
LT3060-3.3: VOUT = 3.3V, VIN = 0V 5 10 µA
LT3060-5: VOUT = 5V, VIN = 0V 5 10 µA
LT3060-15: VOUT = 15V, VIN = 0V 5 10 µA
LT3060: VOUT = 1.2V, VIN = 0V 0.2 10 µA
LT3060 Series
7
3060fc
For more information www.linear.com/LT3060
OUTPUT CURRENT (mA)
0
0
DROPOUT VOLTAGE (mV)
450
350
400
300
250
200
150
100
50
550
500
10 60 70 80 90 10020 30 40
3060 G01
50
TJ = 25°C
TJ = 125°C
OUTPUT CURRENT (mA)
0
0
GUARANTEED DROPOUT VOLTAGE (mV)
450
400
350
300
250
200
150
100
50
550
500
10 60 70 80 90 10020 30 40
3060 G02
50
TJ ≤ 150°C
TJ ≤ 25°C
= TEST POINTS
TEMPERATURE (°C)
–75
0
DROPOUT VOLTAGE (mV)
450
500
400
350
300
250
200
150
100
50
550
–50 75 100 125 150 175–25 0 25
3060 G03
50
IL = 100mA
IL = 50mA
IL = 10mA
IL = 1mA
Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage
Typical perForMance characTerisTics
TEMPERATURE (°C)
–75
0
QUIESCENT CURRENT (µA)
50
60
70
40
30
20
10
80
–50 75 100 125 150 175–25 0 25
3060 G04
50
VIN = 6V, VSHDN = VIN
RL = ∞ (120k FOR LT3060)
IL = 0 (5µA FOR LT3060)
LT3060
VSHDN = 0V
LT3060-1.2/-1.5/-1.8/-2.5/-3.3/-5
Quiescent Current LT3060-1.2 Output Voltage LT3060-1.5 Output Voltage
LT3060-1.8 Output Voltage LT3060-2.5 Output Voltage LT3060-3.3 Output Voltage
TA = 25°C, unless otherwise noted.
TEMPERATURE (°C)
–75
1.176
OUTPUT VOLTAGE (V)
1.200
1.204
1.208
1.212
1.216
1.220
1.196
1.192
1.188
1.184
1.180
1.224
–50 75 100 125 150 175–25 0 25
3060 G05
50
IL = 1mA
TEMPERATURE (°C)
–75
1.470
OUTPUT VOLTAGE (V)
1.500
1.505
1.510
1.515
1.520
1.525
1.495
1.490
1.485
1.480
1.475
1.530
–50 75 100 125 150 175–25 0 25
3060 G06
50
IL = 1mA
TEMPERATURE (°C)
–75
1.764
OUTPUT VOLTAGE (V)
1.800
1.806
1.812
1.818
1.824
1.830
1.794
1.788
1.782
1.776
1.770
1.836
–50 75 100 125 150 175–25 0 25
3060 G07
50
IL = 1mA
TEMPERATURE (°C)
–75
2.45
OUTPUT VOLTAGE (V)
2.49
2.50
2.51
2.52
2.53
2.54
2.48
2.47
2.46
2.55
–50 75 100 125 150 175–25 0 25
3060 G08
50
IL = 1mA
TEMPERATURE (°C)
–75
3.234
OUTPUT VOLTAGE (V)
3.300
3.311
3.322
3.333
3.344
3.355
3.289
3.278
3.267
3.256
3.245
3.366
–50 75 100 125 150 175–25 0 25
3060 G09
50
IL = 1mA
LT3060 Series
8
3060fc
For more information www.linear.com/LT3060
Typical perForMance characTerisTics
TA = 25°C, unless otherwise noted.
TEMPERATURE (°C)
–75
0.588
ADJ PIN VOLTAGE (V)
0.600
0.602
0.604
0.606
0.608
0.610
0.598
0.596
0.594
0.592
0.590
0.612
–50 75 100 125 150 175–25 0 25
3060 G11
50
IL = 1mA
VIN = 2.1V
LT3060 ADJ Pin Voltage
0 1 2 7 8 9 103 4 5 6
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G15
TJ = 25°C
RL = ∞
VOUT = 2.5V
VSHDN = 0V
VSHDN = VIN
LT3060-2.5 Quiescent Current
LT3060-5 Output Voltage LT3060-15 Output Voltage
TEMPERATURE (°C)
–75
4.90
OUTPUT VOLTAGE (V)
4.98
5.00
5.02
5.04
5.06
5.08
4.96
4.94
4.92
5.10
–50 75 100 125 150 175–25 0 25
3060 G10
50
IL = 1mA
LT3060-1.2 Quiescent Current
INPUT VOLTAGE (V)
0 1
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
2 7 8 9 103 4 5
3060 G12
6
TJ = 25°C
RL = ∞
VOUT = 1.2V
VSHDN = 0V
VSHDN = VIN
LT3060-1.5 Quiescent Current
0 1 2 7 8 9 103 4 5 6
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G13
TJ = 25°C
RL = ∞
VOUT = 1.5V
VSHDN = 0V
VSHDN = VIN
LT3060-1.8 Quiescent Current
0 1 2 7 8 9 103 4 5 6
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G14
TJ = 25°C
RL = ∞
VOUT = 1.8V
VSHDN = 0V
VSHDN = VIN
LT3060-3.3 Quiescent Current
0 1 2 7 8 9 103 4 5 6
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G16
TJ = 25°C
RL = ∞
VOUT = 3.3V
VSHDN = 0V
VSHDN = VIN
LT3060-5 Quiescent Current
0 1 2 7 8 9 103 4 5 6
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G17
TJ = 25°C
RL = ∞
VOUT = 5V
VSHDN = 0V
VSHDN = VIN
TEMPERATURE (°C)
–75
14.70
OUTPUT VOLTAGE (V)
15.00
15.05
15.10
15.15
15.20
15.25
14.95
14.90
14.80
14.85
14.75
15.30
–50 75 100 125 150 175–25 0 25
3060 G10a
50
IL = 1mA
LT3060 Series
9
3060fc
For more information www.linear.com/LT3060
INPUT VOLTAGE (V)
0
0
QUIESCENT CURRENT (µA)
70
60
50
40
30
20
10
80
5 30 35 40 4510 15 20
3060 G18
25
TJ = 25°C
RL = 120k
VOUT = 0.6V
VSHDN = VIN
VSHDN = 0
LT3060 Quiescent CurrentLT3060-15 Quiescent Current
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G22
5
TJ = 25°C
*FOR VOUT = 2.5V
VSHDN = VIN
RL = 25Ω
IL = 100mA*
RL = 50Ω
IL = 50mA*
RL = 250Ω
IL = 10mA*
RL = 2.5k
IL = 1mA*
LT3060-2.5 GND Pin Current
Typical perForMance characTerisTics
TA = 25°C, unless otherwise noted.
LT3060-1.2 GND Pin Current
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G19
5
TJ = 25°C
*FOR VOUT = 1.2V
VSHDN = VIN
RL = 12Ω
IL = 100mA*
RL = 24Ω
IL = 50mA*
RL = 120Ω
IL = 10mA*
RL = 1.2k
IL = 1mA*
LT3060-1.5 GND Pin Current
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G20
5
TJ = 25°C
*FOR VOUT = 1.5V
VSHDN = VIN
RL = 15Ω
IL = 100mA*
RL = 30Ω
IL = 50mA*
RL = 150Ω
IL = 10mA*
RL = 1.5k
IL = 1mA*
LT3060-1.8 GND Pin Current
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G21
5
TJ = 25°C
*FOR VOUT = 1.8V
VSHDN = VIN
RL = 18Ω
IL = 100mA*
RL = 36Ω
IL = 50mA*
RL = 180Ω
IL = 10mA*
RL = 1.8k
IL = 1mA*
LT3060-3.3 GND Pin Current
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G23
5
TJ = 25°C
*FOR VOUT = 3.3V
VSHDN = VIN
RL = 33Ω
IL = 100mA*
RL = 66Ω
IL = 50mA*
RL = 330Ω
IL = 10mA*
RL = 3.3k
IL = 1mA*
LT3060-5 GND Pin Current LT3060-15 GND Pin Current
0 5
10
35 40 4515 20 25 30
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
100
125
150
175
75
50
25
200
3060 G17a
TJ = 25°C
RL = ∞
VOUT = 15V
VSHDN = 0V
VSHDN = VIN
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
6 7 8 9 1021 3 4
3060 G24
5
TJ = 25°C
*FOR VOUT = 5V
VSHDN = VIN
RL = 50Ω
IL = 100mA*
RL = 100Ω
IL = 50mA*
RL = 500Ω
IL = 10mA*
RL = 5k
IL = 1mA*
0 5
10
35 40 4515 20 25 30
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (mA)
1.50
1.25
1.75
2.00
2.25
1.00
0.75
0.50
0.25
2.50
3060 G24a
TJ = 25°C
*FOR VOUT = 15V
VSHDN = VIN
RL = 150Ω
IL = 100mA*
RL = 300Ω
IL = 50mA*
RL = 1.5k
IL = 10mA*
RL = 15k
IL = 1mA*
LT3060 Series
10
3060fc
For more information www.linear.com/LT3060
SHDN Pin Input Current
TEMPERATURE (°C)
–75
0
SHDN PIN INPUT CURRENT (µA)
1.4
1.6
1.8
1.2
1.0
0.8
0.4
0.6
0.2
2.0
–50 75 100 125 150 175–25 0 25
3060 G29
50
VSHDN = 45V
ADJ Pin Bias Current
TEMPERATURE (°C)
–75
–50
ADJ PIN BIAS CURRENT (nA)
20
30
40
10
0
–10
–30
–20
–40
50
–50 75 100 125 150 175–25 0 25
3060 G30
50
Current Limit vs VIN–VOUT
INPUT/OUTPUT DIFFERENTIAL (V)
0
0
CURRENT LIMIT (mA)
225
150
175
200
125
100
50
75
25
250
5 30 35 40 4510 15 20
3060 G31
25
∆VOUT = – 5%
TJ = 25°C
TJ = 125°C
TJ = –50°C
6-PHASE
4-PHASE
3-PHASE
2-PHASE
1-PHASE
Current Limit vs Temperature
TEMPERATURE (°C)
–75
0
CURRENT LIMIT (mA)
175
200
225
150
125
100
50
75
25
250
–50 75 100 125 150 175–25 0 25
3060 G32
50
VIN = 7V
VOUT = 0V
LT3060 Reverse Output Current
OUTPUT VOLTAGE (V)
0
0
REVERSE OUTPUT CURRENT (mA)
1.4
1.6
1.8
1.2
1.0
0.8
0.4
0.6
0.2
2.0
5 30 35 40 4510 15 20
3060 G33
25
ADJ
OUT
TJ = 25°C
VIN = 0V
CURRENT FLOWS
INTO OUT PIN
VOUT = VADJ
Typical perForMance characTerisTics
SHDN Pin Threshold
TEMPERATURE (°C)
–75
0
SHDN PIN THRESHOLD (V)
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
0.6
0.5
0.4
0.2
0.3
0.1
1.5
–50 75 100 125 150 175–25 0 25
3060 G27
50
ON TO OFF
OFF TO ON
SHDN Pin Input Current
SHDN PIN VOLTAGE (V)
0
0
SHDN PIN INPUT CURRENT (µA)
1.4
1.6
1.8
1.2
1.0
0.8
0.4
0.6
0.2
2.0
5 30 35 40 4510 15 20
3060 G28
25
TA = 25°C, unless otherwise noted.
GND Pin Current vs ILOAD
OUTPUT CURRENT (mA)
0
0
GND PIN CURRENT (mA)
3.5
3.0
2.5
2.0
1.0
1.5
0.5
4.0
10 60 70 80 90 10020 30 40
3060 G26
50
VIN = VOUT(NOMINAL) + 1V
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
2.50
1 6 7 8 9 102 3 4
3060 G25
5
TJ = 25°C
*FOR VOUT = 0.6V
VSHDN = VIN
RL = 6Ω
IL = 100mA*
RL = 12Ω
IL = 50mA*
RL = 60Ω
IL = 10mA*
RL = 600Ω
IL = 1mA*
LT3060 GND Pin Current
LT3060 Series
11
3060fc
For more information www.linear.com/LT3060
Reverse Output Current
TEMPERATURE (°C)
–75
0
REVERSE OUTPUT CURRENT (µA)
35
40
45
30
25
20
10
15
5
50
–50 75 100 125 150 175–25 0 25
3060 G35
50
VIN = 0V, VOUT = VADJ = 1.2V (LT3060)
VOUT = 1.2V (LT3060-1.2)
VOUT = 1.5V (LT3060-1.5)
VOUT = 1.8V (LT3060-1.8)
VOUT = 2.5V (LT3060-2.5)
VOUT = 3.3V (LT3060-3.3)
VOUT = 5V (LT3060-5)
VOUT = 15V (LT3060-15)
OUT (LT3060)
ADJ (LT3060)
OUT (LT3060-1.2/-1.5/
-1.8/2.5/-3.3/-5/-15)
LT3060-1.2/-1.5/-1.8/-2.5/-3.3/-5
/-15 Reverse Output Current
OUTPUT VOLTAGE (V)
0
0
REVERSE OUTPUT CURRENT (µA)
250
150
200
100
50
350
300
5 30 35 40 4510 15 20
3060 G34
25
LT3060-1.2
LT3060-5
LT3060-15
LT3060-1.5
LT3060-1.8
LT3060-2.5
LT3060-3.3
TJ = 25°C
VIN = 0V
Typical perForMance characTerisTics
Input Ripple Rejection
IL = 100mA
CREF/BYP = CFF = 0
VIN = VOUT(NOMINAL) + 1.5V +
50mVRMS RIPPLE
FREQUENCY (Hz)
10
0
RIPPLE REJECTION (dB)
60
70
80
90
50
40
30
20
10
100
100 10M1k 10k 100k
3060 G36
1M
VOUT = 0.6V
COUT = 10µF
COUT = 2.2µF
VOUT = 5V
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 0.6V, COUT = 2.2µF
LT3060-5 Input Ripple Rejection LT3060-15 Input Ripple Rejection
FREQUENCY (Hz)
10
0
RIPPLE REJECTION (dB)
60
70
80
90
50
40
30
20
10
100
100 10M1k 10k 100k
3060 G37
1M
IL = 100mA
VOUT = 5V
COUT = 10µF
VIN = 6V + 50mVRMS RIPPLE
CREF/BYP = CFF = 10nF
CREF/BYP = 10nF, CFF = 0
CREF/BYP = CFF = 0
Ripple Rejection vs Temperature
TEMPERATURE (°C)
–75
0
RIPPLE REJECTION (dB)
90
80
70
60
40
50
30
20
10
100
–50 75 100 125 150 175–25 0 25
3060 G38
50
CREF/BYP = 10nF
CREF/BYP = 0
IL = 100mA
VOUT = 0.6V
VIN = 2.6V + 0.5VP-P RIPPLE AT f = 120Hz
Minimum Input Voltage
TEMPERATURE (°C)
–75
0
MINIMUM INPUT VOLTAGE (V)
1.4
1.6
1.8
2.0
1.2
1.0
0.8
0.4
0.6
0.2
2.2
–50 75 100 125 150 175–25 0 25
3060 G39
50
IL = 50mA
IL = 100mA
VSHDN = VIN
Load Regulation Load Regulation
TEMPERATURE (°C)
–75
LOAD REGULATION (mV)
5
0
–5
–10
–20
–15
–25 –50 75 100 125 150 175–25 0 25
3060 G40
50
VIN = VOUT(NOMINAL) + 0.55V (LT3060-1.8/-2.5/-3.3/-5)
VIN = 2.1V (LT3060/-1.2/-1.5)
∆IL = 1mA TO 100mA
LT3060-5
LT3060-3.3
LT3060-2.5
LT3060-1.8
LT3060-1.5
LT3060-1.2
LT3060
TA = 25°C, unless otherwise noted.
FREQUENCY (Hz)
10
0
RIPPLE REJECTION (dB)
60
70
80
90
50
40
30
20
10
100
100 10M1k 10k 100k
3060 G37a
1M
IL = 100mA
VOUT = 15V
COUT = 10µF
VIN = 16V + 50mVRMS RIPPLE
CREF/BYP = CFF = 10nF
CREF/BYP = 10nF, CFF = 0
CREF/BYP = CFF = 0
TEMPERATURE (°C)
–75
LOAD REGULATION (mV)
0
–5
–10
–15
–25
–30
–35
–40
–45
–20
–50 –50 75 100 125 150 175–25 0 25
3060 G40a
50
VIN = VOUT(NOMINAL) + 0.55V
∆IL = 1mA TO 100mA
LT3060-2.5
LT3060-5
LT3060-15
LT3060 Series
12
3060fc
For more information www.linear.com/LT3060
RMS Output Noise vs Load Current
vs CREF/BYP, CFF = 0
LOAD CURRENT (mA)
0.01
0
OUTPUT NOISE VOLTAGE (µV
RMS
)
40
30
20
10
110
100
90
80
70
60
50
101 100
3060 G44
0.1
VOUT = 0.6V
COUT = 10µF CREF/BYP = 0
CREF/BYP = 10pF
CREF/BYP = 100pF
CREF/BYP = 1nF
CREF/BYP = 10nF
CREF/BYP = 100nF
Typical perForMance characTerisTics
RMS Output Noise
vs Feedforward Capacitor (CFF)
RMS Output Noise
vs Feedforward Capacitor (CFF)
RMS Output Noise vs Load Current
CREF/BYP = 10nF, CFF = 0
RMS Output Noise vs Load Current
CREF/BYP = 10nF, CFF = 0
LOAD CURRENT (mA)
0.01
0
OUTPUT NOISE VOLTAGE (µVRMS)
50
40
30
20
10
170
120
130
140
150
160
110
100
90
80
70
60
101 100
3060 G45
0.1
VOUT = 5V
VOUT = 3.3V
VOUT = 1.2V
VOUT = 2.5V
VOUT = 1.8V
VOUT = 1.5V
VOUT = 0.6V
f = 10Hz TO 100kHz
COUT = 10µF
IFB-DIVIDER = 5µA
FEEDFORWARD CAPACITOR, CFF (F)
10p
0
OUTPUT NOISE VOLTAGE (µVRMS)
10
120
70
80
90
100
110
60
50
40
30
20
1n 10n
3060 G46
100p
f = 10Hz TO 100kHz
CREF/BYP = 10nF
COUT = 10µF
IFB-DIVIDER = 5µA
IL = 100mA
VOUT = 0.6V
VOUT = 5V
VOUT = 1.8V
VOUT = 1.5V
VOUT = 1.2V
VOUT = 2.5V
VOUT = 3.3V
TA = 25°C, unless otherwise noted.
Output Noise Spectral Density
CREF/BYP = 0, CFF = 0
VOUT = 1.8V
VOUT = 1.5V
VOUT = 1.2V
VOUT = 0.6V
VOUT = 15V
VOUT = 5V
VOUT = 3.3V
VOUT = 2.5V
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
10
1
0.1
100
10k 100k100
3060 G41
1k
COUT = 10µF
IL = 100mA
Output Noise Spectral Density
vs CREF/BYP, CFF = 0
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
1
0.1
10
10k1k 100k
3060 G42
100
VOUT = 5V
CREF/BYP = 10nF
CREF/BYP = 1nF
VOUT = 0.6V
COUT = 10µF
IL = 100mA
CREF/BYP = 100pF
Output Noise Spectral Density
vs CFF, CREF/BYP = 10nF
FREQUENCY (Hz)
10
0.01
OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz)
1
0.1
10
10k1k 100k
3060 G43
100
CFF = 0
CFF = 100pF
CFF = 10nF
VOUT = 5V
COUT = 10µF
IL = 100mA
CFF = 1nF
LOAD CURRENT (mA)
0.01
0
OUTPUT NOISE VOLTAGE (µVRMS)
125
100
75
50
25
350
250
275
300
325
225
200
175
150
101 100
3060 G45a
0.1
VOUT = 15V
VOUT = 5V
VOUT = 2.5V
VOUT = 0.6V
f = 10Hz TO 100kHz
COUT = 10µF
IFB-DIVIDER = 5µA
FEEDFORWARD CAPACITOR, CFF (F)
10p
0
OUTPUT NOISE VOLTAGE (µVRMS)
25
250
150
175
200
225
125
100
75
50
1n 10n
3060 G46a
100p
f = 10Hz TO 100kHz
CREF/BYP = 10nF
COUT = 10µF
IFB-DIVIDER = 5µA
IL = 100mA
VOUT = 0.6V
VOUT = 15V
VOUT = 5V
VOUT = 2.5V
LT3060 Series
13
3060fc
For more information www.linear.com/LT3060
LT3060-5 10Hz to 100kHz Output
Noise, CREF/BYP = 10nF, CFF = 10nF
LT3060-5 Transient Response,
CFF = 0
LT3060-5 Transient Response,
CFF = 10nF
1ms/DIVCOUT = 10µF
IL = 100mA
VOUT = 5V
VOUT
100µV/DIV
3060 G48 100µs/DIVVIN = 6V
COUT = CIN = 10µF
IFB-DIVIDER = 5µA
VOUT
50mV/DIV
IOUT
50mA/DIV
3060 G49
∆IOUT = 10mA TO 100mA
VOUT = 5V
20µs/DIVVIN = 6V
COUT = CIN = 10µF
IFB-DIVIDER = 5µA
VOUT
20mV/DIV
IOUT
50mA/DIV
3060 G50
∆IOUT = 10mA TO 100mA
VOUT = 5V
LT3060-5 10Hz to 100kHz Output
Noise, CREF/BYP = 10nF, CFF = 0
1ms/DIVCOUT = 10µF
IL = 100mA
VOUT = 5V
VOUT
100µV/DIV
3060 G47
Typical perForMance characTerisTics
LT3060-5 Transient Response
Load Dump
SHDN Transient Response
CREF/BYP = 0
SHDN Transient Response
CREF/BYP = 10nF
2ms/DIV
COUT = CIN = 2.2µF
CREF/BYP = CFF = 10nF
IFB-DIVIDER = 5µA
VOUT
10mV/DIV
VIN
10V/DIV
3060 G51
VIN = 12V TO 45V
VOUT = 5V
4ms/DIV
VOUT
2V/DIV
RL = 50Ω
REF/BYP
500mV/DIV
SHDN
1V/DIV
3060 G52
COUT = CIN = 2.2µF
CFF = 0
4ms/DIV
VOUT
2V/DIV
RL = 50Ω
REF/BYP
500mV/DIV
SHDN
1V/DIV
3060 G53
COUT = CIN = 2.2µF
CFF = 0
TA = 25°C, unless otherwise noted.
LT3060 Series
14
3060fc
For more information www.linear.com/LT3060
Start-Up Time
vs REF/BYP Capacitor
REF/BYP CAPACITOR (F)
10p
0.01
START-UP TIME (ms)
10
1
0.1
100
10n 100n100p
3060 G54
1n
CFF = 0
Start-Up Time vs CFF
LT3060-5
LT3060-15
FEEDFORWARD CAPACITOR, CFF (F)
10p
START-UP TIME (ms)
10n1n 100n
3060 G55
100p
CREF/BYP = 0
IFB-DIVIDER = 5µA
0.01
1
10
1000
100
0.1
LT3060-3.3
LT3060-1.2
LT3060-1.5
LT3060-1.8
LT3060-2.5
Typical perForMance characTerisTics
TA = 25°C, unless otherwise noted.
LT3060 Series
15
3060fc
For more information www.linear.com/LT3060
pin FuncTions
REF/BYP (Pin 1/Pin 8): Reference/Bypass. Connecting
a single capacitor from this pin to GND bypasses the
LT3060’s reference noise and soft-starts the reference.
A 10nF bypass capacitor typically reduces output voltage
noise to 30µVRMS in a 10Hz to 100kHz bandwidth. Soft-
start time is directly proportional to the REF/BYP capacitor
value. If the LT3060 is placed in shutdown, REF/BYP is
actively pulled low by an internal device to reset soft-start.
If low noise or soft-start performance is not required, this
pin must be left floating (unconnected). Do not drive this
pin with any active circuitry.
ADJ (Pin 2/Pin 7): Adjust. This pin is the error ampli-
fier’s inverting terminal. It’s typical bias current of 15nA
flows out of the pin (see curve of ADJ Pin Bias Current vs
Temperature in the Typical Performance Characteristics
section). The ADJ pin voltage is 600mV referenced to GND.
Connecting a capacitor from ADJ to OUT reduces output
noise and improves transient response for output voltages
greater than 600mV. See the Applications Information sec-
tion for calculating the value of the feedforward capacitor.
For fixed voltage versions of the LT3060, if low noise and
fast transient response is not required, this pin must be
left floating (unconnected).
OUT (Pins 3, 4/Pin 6): Output. These pin(s) supply power to
the load. Stability requirements demand a minimum 2.2µF
ceramic output capacitor to prevent oscillations. Large
load transient applications require larger output capaci-
tors to limit peak voltage transients. See the Applications
Information section for details on transient response and
reverse output characteristics. Permissible output voltage
range is 600mV to 44.5V.
IN (Pins 5, 6/Pin 5): Input. These pin(s) supply power to
the device. The LT3060 requires a local IN bypass capacitor
if it is located more than six inches from the main input
filter capacitor. In general, battery output impedance rises
with frequency, so adding a bypass capacitor in battery-
powered circuits is advisable.
An input bypass capacitor in the range of 1µF to 10µF
suffices. The LT3060 withstands reverse voltages on the
IN pin with respect to its GND and OUT pins. In a reversed
input situation, such as a battery plugged in backwards,
the LT3060 behaves as if a large resistor is in series with
its input. Limited reverse current flows into the LT3060
and no reverse voltage appears at the load. The device
protects itself and the load.
SHDN (Pin 7/Pin 1): Shutdown. Pulling the SHDN pin
low puts the LT3060 into a low power state and turns
the output off. Drive the SHDN pin with either logic or an
open collector/drain with a pull-up resistor. The resistor
supplies the pull-up current to the open collector/drain
logic, normally several microamperes, and the SHDN
pin current, typically less than 3µA. If unused, connect
the SHDN pin to IN. The LT3060 does not function if the
SHDN pin is not connected. The SHDN pin cannot be
driven below GND unless tied to the IN pin. If the SHDN
pin is driven below GND while IN is powered, the output
may turn on. SHDN pin logic cannot be referenced to a
negative supply voltage.
GND (Pin 8, Exposed Pad Pin 9/Pins 2, 3, 4): Ground.
For the adjustable LT3060, connect the bottom of the ex-
ternal resistor divider that sets the output voltage directly
to GND for optimum regulation. For the DFN package, tie
exposed pad Pin 9 directly to Pin 8 and the PCB ground.
This exposed pad provides enhanced thermal performance
with its connection to the PCB ground. See the Applica-
tions Information section for thermal considerations and
calculating junction temperature.
(DC8/TS8)
LT3060 Series
16
3060fc
For more information www.linear.com/LT3060
The LT3060 series are micropower, low noise, low drop-
out voltage, 100mA linear regulators with shutdown. The
devices supply up to 100mA at a typical dropout voltage
of 300mV and operate over a 1.6V to 45V input range.
A single external capacitor provides programmable low
noise reference performance and output soft-start func-
tionality. For example, connecting a 10nF capacitor from
the REF/BYP pin to GND lowers output noise to 30µVRMS
over a 10Hz to 100kHz bandwidth. This capacitor also
soft-starts the reference and prevents output voltage
overshoot at turn-on.
The LT3060’s quiescent current is merely 40μA for the
adjustable version and 45µA for the fixed voltage versions,
while providing fast transient response with a minimum
low ESR 2.2μF ceramic output capacitor. In shutdown,
quiescent current is less than 1μA and the reference soft-
start capacitor is reset.
The LT3060 regulators optimize stability and transient
response with low ESR, ceramic output capacitors. The
regulators do not require the addition of ESR as is com-
mon with other regulators. The LT3060 adjustable version
typically provides 0.1% line regulation and 0.03% load
regulation. For fixed voltage versions, load regulation is
slightly increased due to 20mΩ of typical resistance in
series with the output. Curves of load regulation appear
in the Typical Performance Characteristics section.
Internal protection circuitry includes reverse-battery pro-
tection, reverse-output protection, reverse-current protec-
tion, current limit with foldback and thermal shutdown.
This “bullet-proof” protection set makes it ideal for use in
battery-powered systems. In battery backup applications
where the output is held up by a backup battery and the
input is pulled to ground, the LT3060 acts like it has a di-
ode in series with its output and prevents reverse current
flow. Additionally, in dual supply applications where the
regulator load is returned to a negative supply, the output
can be pulled below ground by as much as 45V and the
device still starts normally and operates.
applicaTions inForMaTion
3060 F01
IN
SHDN
OUT
ADJ
GND REF/BYP
LT3060
VIN
VOUT
R2
R1
Figure 1. Adjustable Operation
VOUT =0.6V 1+R2
R1
– IADJ •R2
( )
VADJ =0.6V
IADJ =15nA at 25º C
OUTPUT RANGE =0.6V to 44.5V
Adjustable Operation
The LT3060 adjustable version has an output voltage
range of 0.6V to 44.5V. The output voltage is set by the
ratio of two external resistors, as shown in Figure 1.
The device servos the output to maintain the ADJ pin
voltage at 0.6V referenced to ground. The current in
R1 is then equal to 0.6V/R1, and the current in R2
is the current in R1 minus the ADJ pin bias current.
The ADJ pin bias current, 15nA at 25°C, flows from the
ADJ pin through R1 to GND. Calculate the output voltage
using the formula in Figure 1. The value of R1 should be no
greater than 124k to provide a minimum 5µA load current
so that errors in the output voltage, caused by the ADJ pin
bias current, are minimized. Note that in shutdown, the
output is turned off and the divider current is zero. Curves
of ADJ Pin Voltage vs Temperature and ADJ Pin Bias Cur-
rent vs Temperature appear in the Typical Performance
Characteristics section.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin, yielding VOUT = 0.6V. Specifications
for output voltages greater than 0.6V are proportional to
the ratio of the desired output voltage to 0.6V: VOUT/0.6V.
For example, load regulation for an output current change
of 1mA to 100mA is 0.2mV (typical) at VOUT = 0.6V. At
VOUT = 12V, load regulation is:
12V
0.6V
•(0.2mV) =4mV
LT3060 Series
17
3060fc
For more information www.linear.com/LT3060
Table 1 shows 1% resistor divider values for some common
output voltages with a resistor divider current of about 5µA.
Table 1. Output Voltage Resistor Divider Values
VOUT
(V)
R1
(kΩ)
R2
(kΩ)
1.2 118 118
1.5 121 182
1.8 124 249
2.5 115 365
3 124 499
3.3 124 562
5 115 845
12 124 2370
15 124 3010
Bypass Capacitance, Output Voltage Noise and
Transient Response
The LT3060 regulators provide low output voltage noise
over the 10Hz to 100kHz bandwidth while operating at
full load with the addition of a reference bypass capacitor
(CREF/BYP) from the REF/BYP pin to GND. A good quality,
low leakage capacitor is recommended. This capacitor
bypasses the internal reference of the regulator, provid-
ing a low frequency noise pole. With the use of 10nF for
CREF/BYP, the output voltage noise decreases to as low as
30µVRMS when the output voltage is set for 0.6V. For higher
output voltages (generated by using a feedback resistor
divider), the output voltage noise gains up accordingly
when using CREF/BYP by itself.
To lower the output voltage noise for higher output volt-
ages, include a feedforward capacitor (CFF) from VOUT
to the ADJ pin. A good quality, low leakage capacitor is
recommended. This capacitor bypasses the error amplifier
of the regulator, providing a low frequency noise pole. With
the use of 10nF for both CFF and CREF/BYP, output voltage
noise decreases to 30µVRMS when the output voltage is
set to 5V by a 5µA feedback resistor divider. If the current
in the feedback resistor divider is doubled, CFF must also
be doubled to achieve equivalent noise performance.
Higher values of output voltage noise are often measured
if care is not exercised with regard to circuit layout and
testing. Crosstalk from nearby traces induces unwanted
noise onto the LT3060’s output. Power supply ripple rejec-
tion must also be considered. The LT3060 regulators do
not have unlimited power supply rejection and will pass
a small portion of the input noise through to the output.
Using a feedforward capacitor (CFF) from VOUT to the ADJ
pin has the added benefit of improving transient response
for output voltages greater than 0.6V. With no feedforward
capacitor, the settling time will increase as the output
voltage is raised above 0.6V. Use the equation in Figure 2
to determine the minimum value of CFF to achieve a
transient response that is similar to 0.6V output voltage
performance regardless of the chosen output voltage
(see Figure 3 and Transient Response in the Typical Perf-
ormance Characteristics section).
Figure 2. Feedforward Capacitor for Fast Transient Response
Figure 3. Transient Response vs Feedforward Capacitor
applicaTions inForMaTion
3060 F02
IN
SHDN
OUT
ADJ
GND REF/BYP
LT3060
VIN
VOUT
CREF/BYP
CFF COUT
R2
R1
100µs/DIV
VOUT = 5V
COUT = 10µF
IFB-DIVIDER = 5µA
0
1nF
10nF
LOAD CURRENT
100mA/DIV
FEEDFORWARD
CAPACITOR, CFF
100pF
3060 F03
VOUT
50mV/DIV
CFF ≥4.7nF
5µA •IFB−DIVIDER
( )
IFB−DIVIDER =VOUT
R1+R2
LT3060 Series
18
3060fc
For more information www.linear.com/LT3060
During start-up, the internal reference soft-starts if a
reference bypass capacitor is present. Regulator start-
up time is directly proportional to the size of the bypass
capacitor, slowing to 6ms with a 10nF bypass capacitor
(See Start-up Time vs REF/BYP Capacitor in the Typical
Performance Characteristics section). The reference by-
pass capacitor is actively pulled low during shutdown to
reset the internal reference.
Start-up time is also affected by the use of a feedforward
capacitor. Start-up time is directly proportional to the size
of the feedforward capacitor and output voltage, and is
inversely proportional to the feedback resistor divider
current, slowing to 15ms with a 4.7nF feedforward ca-
pacitor and a 10µF output capacitor for an output voltage
set to 5V by a 5µA feedback resistor divider.
Output Capacitance
The LT3060 regulators are stable with a wide range of
output capacitors. The ESR of the output capacitor af-
fects stability, most notably with small capacitors. Use
a minimum output capacitor of 2.2µF with an ESR of 3Ω
or less to prevent oscillations. If a feedforward capacitor
is used with output voltages set for greater than 24V, use
a minimum output capacitor of 4.7µF. The LT3060 is a
micropower device and output load transient response is
a function of output capacitance. Larger values of output
capacitance decrease the peak deviations and provide
improved transient response for larger load current
changes. Bypass capacitors, used to decouple individual
components powered by the LT3060, increase the effec-
tive output capacitor value. For applications with large
load current transients, a low ESR ceramic capacitor in
parallel with a bulk tantalum capacitor often provides an
optimally damped response.
Give extra consideration to the use of ceramic capacitors.
Manufacturers make ceramic capacitors with a variety of
dielectrics, each with different behavior across tempera-
ture and applied voltage. The most common dielectrics
are specified with EIA temperature characteristic codes
of Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics
provide high C-V products in a small package at low cost,
but exhibit strong voltage and temperature coefficients, as
shown in Figures 4 and 5. When used with a 5V regulator,
a 16V 10µF Y5V capacitor can exhibit an effective value
as low as 1µF to 2µF for the DC bias voltage applied, and
over the operating temperature range. The X5R and X7R
dielectrics yield much more stable characteristics and
are more suitable for use as the output capacitor.
The X7R type works over a wider temperature range
and has better temperature stability, while the X5R is
less expensive and is available in higher values. Care
still must be exercised when using X5R and X7R ca-
pacitors; the X5R and X7R codes only specify operating
temperature range and maximum capacitance change
over temperature. Capacitance change due to DC bias
with X5R and X7R capacitors is better than Y5V and Z5U
Figure 4. Ceramic Capacitor DC Bias Characteristics
applicaTions inForMaTion
DC BIAS VOLTAGE (V)
CHANGE IN VALUE (%)
3060 F04
20
0
–20
–40
–60
–80
–100 04810
2 6 12 14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
TEMPERATURE (°C)
–50
40
20
0
–20
–40
–60
–80
–100 25 75
3060 F05
–25 0 50 100 125
Y5V
CHANGE IN VALUE (%)
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10µF
Figure 5. Ceramic Capacitor Temperature Characteristics
LT3060 Series
19
3060fc
For more information www.linear.com/LT3060
4ms/DIV
3060 F06
VOUT
500µV/DIV
VOUT = 0.6V
COUT = 10µF
CREF/BYP = 10nF
ILOAD = 100mA
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
applicaTions inForMaTion
capacitors, but can still be significant enough to drop
capacitor values below appropriate levels. Capacitor DC
bias characteristics tend to improve as component case
size increases, but expected capacitance at operating
voltage should be verified.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
similar to the way a piezoelectric accelerometer or mi-
crophone works. For a ceramic capacitor, the stress is
induced by vibrations in the system or thermal transients.
The resulting voltages produced cause appreciable
amounts of noise. A ceramic capacitor produced the trace
in Figure 6 in response to light tapping from a pencil.
Similar vibration induced behavior can masquerade as
increased output voltage noise.
allowing the regulator to supply large output currents.
With a high input voltage, a problem can occur wherein
the removal of an output short will not allow the output
to recover. Other regulators, such as the LT1083/LT1084/
LT1085 family and LT1764A also exhibit this phenomenon,
so it is not unique to the LT3060. The problem occurs
with a heavy output load when the input voltage is high
and the output voltage is low. Common situations are: (1)
immediately after the removal of a short-circuit or (2) if
the shutdown pin is pulled high after the input voltage is
already turned on. The load line intersects the output current
curve at two points creating two stable output operating
points for the regulator. With this double intersection, the
input power supply needs to be cycled down to zero and
brought up again for the output to recover.
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125°C for
LT3060E, LT3060I or 150°C for LT3060MP, LT3060H). Two
components comprise the power dissipated by the device:
1. Output current multiplied by the input/output voltage
differential: IOUT • (VIN–VOUT), and
2. GND pin current multiplied by the input voltage:
IGND • VIN
GND pin current is determined using the GND Pin Current
curves in the Typical Performance Characteristics section.
Power dissipation equals the sum of the two components
listed above.
The LT3060 regulators have internal thermal limiting that
protects the device during overload conditions. For continu-
ous normal conditions, the maximum junction temperature
of 125°C (E-grade, I-grade) or 150°C (MP-grade, H-grade)
must not be exceeded. Carefully consider all sources of
thermal resistance from junction-to-ambient including
other heat sources mounted in proximity to the LT3060.
The underside of the LT3060 DFN package has exposed
metal (1mm2) from the lead frame to the die attachment.
The package allows heat to directly transfer from the die
junction to the printed circuit board metal to control maxi-
mum operating junction temperature. The dual-in-line pin
arrangement allows metal to extend beyond the ends of
Overload Recovery
Like many IC power regulators, the LT3060 has safe
operating area protection. The safe operating area protec-
tion decreases current limit as input-to-output voltage
increases, and keeps the power transistor inside a safe
operating region for all values of input-to-output voltage.
The LT3060 provides some output current at all values of
input-to-output voltage up to the specified 45V operational
maximum.
When power is first applied, the input voltage rises and the
output follows the input; allowing the regulator to start-up
into very heavy loads. During start-up, as the input voltage
is rising, the input-to-output voltage differential is small,
LT3060 Series
20
3060fc
For more information www.linear.com/LT3060
the package on the topside (component side) of a PCB.
Connect this metal to GND on the PCB. The multiple IN
and OUT pins of the LT3060 also assist in spreading heat
to the PCB.
For surface mount devices, heat sinking is accomplished
by using the heat spreading capabilities of the PC board
and its copper traces. Copper board stiffeners and plated
through-holes also can spread the heat generated by
power devices.
Tables 2 and 3 list thermal resistance for several different
board sizes and copper areas. All measurements were taken
in still air on a 4 layer FR-4 board with 1oz solid internal
planes and 2oz top/bottom external trace planes with a total
board thickness of 1.6mm. The four layers were electrically
isolated with no thermal vias present. PCB layers, copper
weight, board layout and thermal vias will affect the resul-
tant thermal resistance. For more information on thermal
resistance and high thermal conductivity test boards,
refer to JEDEC standard JESD51, notably JESD51-12 and
JESD51-7. Achieving low thermal resistance necessitates
attention to detail and careful PCB layout.
Table 2. DC Package, 8-Lead DFN
COPPER AREA
BOARD AREA
(mm2)
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*
(mm2)
BACKSIDE
(mm2)
2500 2500 2500 48°C/W
1000 2500 2500 49°C/W
225 2500 2500 50°C/W
100 2500 2500 54°C/W
50 2500 2500 60°C/W
*Device is mounted on topside
Table 3. TS8 Package, 8 Lead TSOT-23
COPPER AREA
BOARD AREA
(mm2)
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*
(mm2)
BACKSIDE
(mm2)
2500 2500 2500 57°C/W
1000 2500 2500 58°C/W
225 2500 2500 59°C/W
100 2500 2500 63°C/W
50 2500 2500 67°C/W
*Device is mounted on topside
Calculating Junction Temperature
Example: Given an output voltage of 2.5V, an input volt-
age range of 12V ±5%, an output current range of 0mA
to 50mA and a maximum ambient temperature of 85°C,
what will the maximum junction temperature be?
The power dissipated by the device equals:
IOUT(MAX) • (VIN(MAX)–VOUT) + IGND • VIN(MAX)
where,
IOUT(MAX) = 50mA
VIN(MAX) = 12.6V
IGND at (IOUT = 50mA, VIN = 12.6V) = 0.6mA
So,
P = 50mA • (12.6V – 2.5V) + 0.6mA • 12.6V = 0.513W
Using a DFN package, the thermal resistance ranges from
48°C/W to 60°C/W depending on the copper area with
no thermal vias. So the junction temperature rise above
ambient approximately equals:
0.513W • 54°C/W = 27.8°C
The maximum junction temperature equals the maximum
ambient temperature plus the maximum junction tempera-
ture rise above ambient or:
TJMAX = 85°C + 27.8°C = 112.8°C
Protection Features
The LT3060 regulators incorporate several protection
features that make it ideal for use in battery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the device also protects
against reverse-input voltages, reverse-output voltages
and reverse output-to-input voltages.
Current limit protection and thermal overload protection
protect the device against current overload conditions at
the output of the device. The typical thermal shutdown
temperature is 165°C. For normal operation, do not exceed
a junction temperature of 125°C (LT3060E, LT3060I) or
150°C (LT3060MP, LT3060H).
applicaTions inForMaTion
LT3060 Series
21
3060fc
For more information www.linear.com/LT3060
applicaTions inForMaTion
The LT3060 IN pin withstands reverse voltages up to 50V.
The device limits current flow to less than 300µA (typi-
cally less than 50µA) and no negative voltage appears at
OUT. The device protects both itself and the load against
batteries that are plugged in backwards.
The SHDN pin cannot be driven below GND unless tied to
the IN pin. If the SHDN pin is driven below GND while IN is
powered, the output may turn on. SHDN pin logic cannot
be referenced to a negative supply voltage.
The LT3060 incurs no damage if its output is pulled be-
low ground. If the input is left open-circuit or grounded,
the output can be pulled below ground by 50V. No cur-
rent flows through the pass transistor from the output.
However, current flows in (but is limited by) the resistor
divider that sets the output voltage. Current flows from
the bottom resistor in the divider and from the ADJ pin’s
internal clamp through the top resistor in the divider to
the external circuitry pulling OUT below ground. If the
input is powered by a voltage source, the output sources
current equal to its current limit capability and the LT3060
protects itself by thermal limiting. In this case, grounding
the SHDN pin turns off the device and stops the output
from sourcing current.
The LT3060 incurs no damage if the ADJ pin is pulled
above or below ground by less than 50V. For the adjust-
able version, if the input is left open-circuit or grounded,
the ADJ pin performs like a large resistor (typically 30k)
in series with a diode when pulled below ground, and like
30k in series with two diodes when pulled above ground.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or left open-
circuit. Current flow back into the output follows the curve
shown in Figures 7 and 8.
If the LT3060’s IN pin is forced below the OUT pin or the
OUT pin is pulled above the IN pin, input current typically
drops to less than 1µA. This occurs if the LT3060 input
is connected to a discharged (low voltage) battery and
either a backup battery or a second regulator holds up
the output. The state of the SHDN pin has no effect on
the reverse current if the output is pulled above the input.
OUTPUT VOLTAGE (V)
0
0
REVERSE OUTPUT CURRENT (mA)
1.4
1.6
1.8
1.2
1.0
0.8
0.4
0.6
0.2
2.0
5 30 35 40 4510 15 20
3060 F07
25
ADJ
OUT
TJ = 25°C
VIN = 0V
CURRENT FLOWS
INTO OUT PIN
VOUT = VADJ
Figure 7. LT3060 Reverse Output Current Figure 8. LT3060-1.2/-1.5/-1.8/-2.5/-3.3/-5/-15
Reverse Output Current
OUTPUT VOLTAGE (V)
0
0
REVERSE OUTPUT CURRENT (µA)
250
150
200
100
50
350
300
5 30 35 40 4510 15 20
3060 F08
25
LT3060-1.2
LT3060-5
LT3060-15
LT3060-1.5
LT3060-1.8
LT3060-2.5
LT3060-3.3
TJ = 25°C
VIN = 0V
LT3060 Series
22
3060fc
For more information www.linear.com/LT3060
Typical applicaTion
+IN
GND REF/BYP
SHDN
OUT
ADJ
LT3060
IN
GND REF/BYP
SHDN
OUT
ADJ
LT3060
VIN > 2.9V C1
2.2µF
R1
0.15Ω
R2
0.15Ω
R3
200Ω
R4
200Ω
C5
10nF
C4
1nF
C3
1nF
2.5V
200mA
C2
4.7µF
R5
1k
3
2
7
4
6
SHDN
–
+
R8
1.91k
1%
R6
1.74k
1%
R7
604Ω
1%
R9
604Ω
1%
LT1637
3060 TA03
Paralleling of Regulators for Higher Output Current
LT3060 Series
23
3060fc
For more information www.linear.com/LT3060
DC Package
8-Lead Plastic DFN (2mm × 2mm)
(Reference LTC DWG # 05-08-1719 Rev A)
2.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
0.40 ± 0.10
BOTTOM VIEW—EXPOSED PAD
0.64 ± 0.10
(2 SIDES)
0.75 ±0.05
R = 0.115
TYP
R = 0.05
TYP
1.37 ±0.10
(2 SIDES)
1
4
85
PIN 1 BAR
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DC8) DFN 0409 REVA
0.23 ± 0.05
0.45 BSC
0.25 ± 0.05
1.37 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
0.64 ±0.05
(2 SIDES)
1.15 ±0.05
0.70 ±0.05
2.55 ±0.05
PACKAGE
OUTLINE
0.45 BSC
PIN 1 NOTCH
R = 0.20 OR
0.25 × 45°
CHAMFER
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
LT3060 Series
24
3060fc
For more information www.linear.com/LT3060
1.50 – 1.75
(NOTE 4)
2.80 BSC
0.22 – 0.36
8 PLCS (NOTE 3)
DATUM ‘A’
0.09 – 0.20
(NOTE 3)
TS8 TSOT-23 0710 REV A
2.90 BSC
(NOTE 4)
0.65 BSC
1.95 BSC
0.80 – 0.90
1.00 MAX 0.01 – 0.10
0.20 BSC
0.30 – 0.50 REF
PIN ONE ID
NOTE:
1. DIMENSIONS ARE IN MILLIMETERS
2. DRAWING NOT TO SCALE
3. DIMENSIONS ARE INCLUSIVE OF PLATING
4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR
5. MOLD FLASH SHALL NOT EXCEED 0.254mm
6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.40
MAX
0.65
REF
RECOMMENDED SOLDER PAD LAYOUT
PER IPC CALCULATOR
1.4 MIN
2.62 REF
1.22 REF
TS8 Package
8-Lead Plastic TSOT-23
(Reference LTC DWG # 05-08-1637 Rev A)
package DescripTion
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
LT3060 Series
25
3060fc
For more information www.linear.com/LT3060
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
revision hisTory
REV DATE DESCRIPTION PAGE NUMBER
A 7/10 Added fixed voltage options for 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and 5V 1-26
B 5/11 Extended MP-Grade to 150°C
Updated test conditions for ADJ Pin Bias Current and Reverse Output Current in Applications Information section
2-7
19-20
C 9/14 Added fixed voltage options for 15V
Updated available packaging in Related Parts section
1 to 14, 17, 21
26
LT3060 Series
26
3060fc
For more information www.linear.com/LT3060
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
LINEAR TECHNOLOGY CORPORATION 2010
LT 0914 REV C • PRINTED IN USA
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT3060
relaTeD parTs
PART
NUMBER DESCRIPTION COMMENTS
LT1761 100mA, Low Noise LDO 300mV Dropout Voltage, Low Noise: 20µVRMS, VIN = 1.8V to 20V, ThinSOT Package
LT1762 150mA, Low Noise LDO 300mV Dropout Voltage, Low Noise: 20µVRMS, VIN = 1.8V to 20V, MS8 Package
LT1763 500mA, Low Noise LDO 300mV Dropout Voltage, Low Noise: 20µVRMS, VIN = 1.8V to 20V, SO8 and 4mm × 3mm DFN Packages
LT1764/
LT1764A 3A, Fast Transient Response,
Low Noise LDO 340mV Dropout Voltage, Low Noise: 40µVRMS, VIN = 2.7V to 20V, TO-220 and DD Packages, LT1764A
Version Stable Also with Ceramic Capacitors
LT1962 300mA, Low Noise LDO 270mV Dropout Voltage, Low Noise: 20µVRMS, VIN = 1.8V to 20V, MS8 Package
LT1963/
LT1963A 1.5A Low Noise, Fast Transient
Response LDO 340mV Dropout Voltage, Low Noise: 40µVRMS, VIN = 2.5V to 20V, LT1963A Version Stable with
Ceramic Capacitors; TO-220, DD, SOT-223 and SO8 Packages
LT1964 200mA, Low Noise, Negative LDO 340mV Dropout Voltage, Low Noise 30µVRMS, VIN = –1.8V to –20V, ThinSOT and 3mm × 3mm DFN
Packages
LT1965 1.1A, Low Noise, Low Dropout
Linear Regulator 290mV Dropout Voltage, Low Noise: 40µVRMS, VIN: 1.8V to 20V, VOUT: 1.2V to 19.5V, Stable with
Ceramic Capacitors; TO-220, DD-Pak, MSOP and 3mm × 3mm DFN Packages
LT3008 20mA, 45V, 3µA IQ Micropower LDO 300mV Dropout Voltage, Low IQ: 3µA, VIN = 2V to 45V, VOUT = 0.6V to 39.5V; ThinSOT and
2mm × 2mm DFN-6 Packages
LT3009 20mA, 3µA IQ Micropower LDO 280mV Dropout Voltage, Low IQ: 3µA, VIN = 1.6V to 20V, 2mm × 2mm DFN and SC70 Packages
LT3050 100mA, Low Noise Linear Regulator
with Precision Current Limit and
Diagnostic Functions.
340mV Dropout Voltage, Low Noise: 30µVRMS, VIN: 1.6V to 45V, VOUT: 0.6V to 44.5V, Programmable
Precision Current Limit: ±5%, Programmable Minimum IOUT Monitor, Output Current Monitor, Fault
Indicator, Reverse Protection; 12-Lead 2mm × 3mm DFN and MSOP Packages.
LT3080/
LT3080-1 1.1A, Parallelable, Low Noise,
Low Dropout Linear Regulator 300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V,
VOUT: 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT Set; Directly Parallelable (No Op
Amp Required), Stable with Ceramic Capacitors; TO-220, SOT-223, MSOP and 3mm × 3mm DFN
Packages; LT3080-1 Version Has Integrated Internal Ballast Resistor
LT3082 200mA, Parallelable, Single Resistor,
Low Dropout Linear Regulator Outputs May Be Paralleled for Higher Output, Current or Heat Spreading, Wide Input Voltage Range:
1.2V to 40V Low Value Input/Output Capacitors Required: 0.22μF, Single Resistor Sets Output Voltage,
Initial Set Pin Current Accuracy: 1%, Low Output Noise: 40μVRMS (10Hz to 100kHz) Reverse-Battery
Protection, Reverse-Current Protection; 8-Lead SOT-23, 3-Lead SOT-223 and
8-Lead 3mm × 3mm DFN Packages
LT3085 500mA, Parallelable, Low Noise,
Low Dropout Linear Regulator 275mV Dropout Voltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V,
VOUT: 0V to 35.7V, Current-Based Reference with 1-Resistor VOUT Set, Directly Parallelable
(No Op Amp Required), Stable with Ceramic Capacitors; MS8E and 2mm × 3mm DFN-6 Packages
LT3092 200mA 2-Terminal Programmable
Current Source Programmable 2-Terminal Current Source, Maximum Output Current: 200mA, Wide Input Voltage
Range: 1.2V to 40V, Resistor Ratio Sets Output Current, Initial Set Pin Current Accuracy: 1%, Current
Limit and Thermal Shutdown Protection, Reverse-Voltage Protection, Reverse-Current Protection;
8-Lead SOT-23, 3-Lead SOT-223 and 8-Lead 3mm × 3mm DFN Packages
12V Low Noise Regulator
Typical applicaTion
3060 TA04
IN
SHDN
OUT
ADJ
GND REF/BYP
LT3060
VIN
13V TO
45V
V
OUT
12V AT 100mA
30µVRMS NOISE
1µF 10µF
CFF
10nF
2.37M
1%
10nF
124k
1%
0 0.1 0.2 0.7 0.8 0.9 1.00.3 0.4 0.5 0.6
TIME (ms)
OUTPUT VOLTAGE DEVIATION
50mV/DIV
LOAD
CURRENT
100mA/DIV
3060 TA04b
VIN = 13V
CFF = 0
CFF = 10nF
∆IL = 10mA TO 100mA
