1/24October 2003
■VO1 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3V FIXED
■VO2 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3V FIXED OR
ADJUSTABLE FROM 1.25 TO VI-V
DROP
■GUARANTEED OUTPUT1 CURRENT: 1A
■GUARANTEED OUTPUT2 CURRENT: 1A
■± 2% OUTPUT TOLERANCE (AT 25°C)
■± 3% OUTPUT TOLERANCE OVER TEMP.
■TYPICAL DROPOUT 1.1V (IO1 =I
O2 =1A)
■INTERNAL POWER AND THERMAL LIMIT
■STABLE WITH LOW ESR OUTPUT
CAPACITOR
■OPERATING TEMPERATURE RANGE:
0°C TO 125°C
■VERY LOW QUIESCENT CURRENT: 7mA
MAX OVER TEMP.
■AVAILABLE IN PPAK, SPAK AND IN DFN
5x6mm PACKAGE
DESCRIPTION
Specifically designed for data storage
applications, this device integrates two voltage
regulators, each one able to supply 1A and it is
assembled in PPAK, in SPAK and in a new 8-PIN
surface mounting package named DFN 5x6mm at
8 pins. The first regulator block supplies 1.5V,
1.8V, 2.5V, 2.8V, 3.0V, 3.3V depending on the
chosen version. The second one may be fixed to
the same values or adjustable from 1.25V to VI-
VDROP that could power several kind of different
micro-controllers. Both outputs are current limited
and over temperature protected. It is worth
underlining the very good thermal performance of
the packages SPAK and DFN with only 2°C/W of
Thermal Resistance Junction to Case.
Applications are HARD DISK, CD/DVD-ROM, CD/
DVD-R/RW, COMBO (DVD-ROM+CD-R/RW).
ST2L05
VERY LOW QUIESCENT CURRENT
DUAL VOLTAGE REGULATOR
BLOCK DIAGRAM OF FIXED/ADJ VERSION
PPAK
DFN
SPAK-5L
ST2L05
2/24
BLOCK DIAGRAM OF FIXED/FIXED VERSION
ST2L05
3/24
ORDERING CODES
(*) Available on request.
(1) For Tube Shipment, change "R" with "-" in the relevant ordering code, DFN is available only in Tape & Reel.
VO1 VO2 SPAK PPAK DFN SHIPMENT (1)
1.5 V 1.5 V ST2L05R1515K5 (*) ST2L05R1515PT (*) ST2L05R1515PS (*) Tape & Reel
1.5 V 1.8 V ST2L05R1518K5 (*) ST2L05R1518PT (*) ST2L05R1518PS (*) Tape & Reel
1.5 V 2.5 V ST2L05R1525K5 (*) ST2L05R1525PT (*) ST2L05R1525PS (*) Tape & Reel
1.5 V 2.8 V ST2L05R1528K5 (*) ST2L05R1528PT (*) ST2L05R1528PS (*) Tape & Reel
1.5 V 3.0 V ST2L05R1530K5 (*) ST2L05R1530PT (*) ST2L05R1530PS (*) Tape & Reel
1.5 V 3.3 V ST2L05R1533K5 (*) ST2L05R1533PT (*) ST2L05R1533PS (*) Tape & Reel
1.5 V ADJ ST2L05R1500K5 (*) ST2L05R1500PT ST2L05R1500PS (*) Tape & Reel
1.8 V 1.5 V ST2L05R1815K5 (*) ST2L05R1815PT (*) ST2L05R1815PS (*) Tape & Reel
1.8 V 1.8 V ST2L05R1818K5 (*) ST2L05R1818PT (*) ST2L05R1818PS (*) Tape & Reel
1.8 V 2.5 V ST2L05R1825K5 (*) ST2L05R1825PT ST2L05R1825PS (*) Tape & Reel
1.8 V 2.8 V ST2L05R1828K5 (*) ST2L05R1828PT (*) ST2L05R1828PS (*) Tape & Reel
1.8 V 3.0 V ST2L05R1830K5 (*) ST2L05R1830PT (*) ST2L05R1830PS (*) Tape & Reel
1.8 V 3.3 V ST2L05R1833K5 (*) ST2L05R1833PT (*) ST2L05R1833PS (*) Tape & Reel
1.8 V ADJ ST2L05R1800K5 (*) ST2L05R1800PT ST2L05R1800PS (*) Tape & Reel
2.5 V 1.5 V ST2L05R2515K5 (*) ST2L05R2515PT (*) ST2L05R2515PS (*) Tape & Reel
2.5 V 1.8 V ST2L05R2518K5 (*) ST2L05R2518PT (*) ST2L05R2518PS (*) Tape & Reel
2.5 V 2.5 V ST2L05R2525K5 (*) ST2L05R2525PT (*) ST2L05R2525PS (*) Tape & Reel
2.5 V 2.8 V ST2L05R2528K5 (*) ST2L05R2528PT (*) ST2L05R2528PS (*) Tape & Reel
2.5 V 3.0 V ST2L05R2530K5 (*) ST2L05R2530PT (*) ST2L05R2530PS (*) Tape & Reel
2.5 V 3.3 V ST2L05R2533K5 (*) ST2L05R2533PT (*) ST2L05R2533PS (*) Tape & Reel
2.5 V ADJ ST2L05R2500K5 (*) ST2L05R2500PT ST2L05R2500PS (*) Tape & Reel
2.8 V 1.5 V ST2L05R2815K5 (*) ST2L05R2815PT (*) ST2L05R2815PS (*) Tape & Reel
2.8 V 1.8 V ST2L05R2818K5 (*) ST2L05R2818PT (*) ST2L05R2818PS (*) Tape & Reel
2.8 V 2.5 V ST2L05R2825K5 (*) ST2L05R2825PT (*) ST2L05R2825PS (*) Tape & Reel
2.8 V 2.8 V ST2L05R2828K5 (*) ST2L05R2828PT (*) ST2L05R2828PS (*) Tape & Reel
2.8 V 3.0 V ST2L05R2830K5 (*) ST2L05R2830PT (*) ST2L05R2830PS (*) Tape & Reel
2.8 V 3.3 V ST2L05R2833K5 (*) ST2L05R2833PT (*) ST2L05R2833PS (*) Tape & Reel
2.8 V ADJ ST2L05R2800K5 (*) ST2L05R2800PT (*) ST2L05R2800PS (*) Tape & Reel
3.0 V 1.5 V ST2L05R3015K5 (*) ST2L05R3015PT (*) ST2L05R3015PS (*) Tape & Reel
3.0 V 1.8 V ST2L05R3018K5 (*) ST2L05R3018PT (*) ST2L05R3018PS (*) Tape & Reel
3.0 V 2.5 V ST2L05R3025K5 (*) ST2L05R3025PT (*) ST2L05R3025PS (*) Tape & Reel
3.0 V 2.8 V ST2L05R3028K5 (*) ST2L05R3028PT (*) ST2L05R3028PS (*) Tape & Reel
3.0 V 3.0 V ST2L05R3030K5 (*) ST2L05R3030PT (*) ST2L05R3030PS (*) Tape & Reel
3.0 V 3.3 V ST2L05R3033K5 (*) ST2L05R3033PT (*) ST2L05R3033PS (*) Tape & Reel
3.0 V ADJ ST2L05R3000K5 (*) ST2L05R3000PT (*) ST2L05R3000PS (*) Tape & Reel
3.3 V 1.5 V ST2L05R3315K5 (*) ST2L05R3315PT (*) ST2L05R3315PS (*) Tape & Reel
3.3 V 1.8 V ST2L05R3318K5 (*) ST2L05R3318PT ST2L05R3318PS (*) Tape & Reel
3.3 V 2.5 V ST2L05R3325K5 (*) ST2L05R3325PT ST2L05R3325PS Tape & Reel
3.3 V 2.8 V ST2L05R3328K5 (*) ST2L05R3328PT (*) ST2L05R3328PS (*) Tape & Reel
3.3 V 3.0 V ST2L05R3330K5 (*) ST2L05R3330PT (*) ST2L05R3330PS (*) Tape & Reel
3.3 V 3.3 V ST2L05R3333K5 (*) ST2L05R3333PT (*) ST2L05R3333PS (*) Tape & Reel
3.3 V ADJ ST2L05R3300K5 ST2L05R3300PT ST2L05R3300PS Tape & Reel
ST2L05
4/24
ABSOLUTE MAXIMUM RATINGS
(*) Storage temperatures > 125°C are only acceptable if the Dual Regulator is soldered to a PCBA.
Absolute Maximum Ratings are those beyond which damage to the device may occur. Functional operation under these condition is not im-
plied.
RECOMMENDED OPERATING CONDITIONS
THERMAL DATA
CONNECTION DIAGRAM (top view for PPAK and SPAK, top through view for DFN8)
PIN DESCRIPTION
Symbol Parameter Value Unit
VIOperating Input Voltage 10 V
PDPower Dissipation Internally Limited
IOSH Short Circuit Output Current - 3.3 V and adjustable output Internally Limited
Top Operating Junction Temperature Range 0 to 150 °C
Tstg Storage Temperature Range(*) -65 to 150 °C
TLEAD Lead Temperature (Soldering) 10 Sec. 260 °C
Symbol Parameter Value Unit
VIInput Voltage 4.5 to 7 V
∆VIInput Voltage Ripple ±0.15 V
t
RISE Input Voltage Rise Time (from 10% to 90%) ≥ 1 µsec
tFALL Input Voltage Fall Time (from 10% to 90%) ≥1 µsec
Symbol Parameter SPAK DFN PPAK Unit
Rthj-case Thermal Resistance Junction-case 228°C/W
R
thj-amb Thermal Resistance Junction-ambient 26 36 100 °C/W
DFN8PPAK SPAK
PPAK/SPAK DFN Symbol Name and Function
13V
I
Bypass with a 4.7µF capacitor to GND
2 4 ADJ/N.C. Resistor divider connection/Not Connected
3 8 GND Ground
45V
O2 Adjustable output voltage: bypass with a 4.7µF capacitor to GND
57V
O1 Fixed output voltage: bypass with a 4.7µF capacitor to GND
1, 2, 6 NC Not Connected
ST2L05
5/24
APPLICATION CIRCUIT OF FIXED/FIXED VERSION
APPLICATION CIRCUIT OF FIXED/ADJ VERSION
NOTE: The regulator is designed to be stable with either tantalum or ceramic capacitors on the input and outputs. The expected values of
the input and output X7R ceramic capacitors are from 4.7µF to 22µF with 4.7µF typical. The input capacitor must be connected within 0.5
inches of the VIterminal. The output capacitors must also be connected within 0.5 inches of output pins VO1 and VO2. There is no upper limit
to the size of the input capacitor (for more details see the Application Hints section).
NOTE: In the Fixed/ADJ version, the adjustable output voltage VO2 is designed to support output voltages from 1.25V to VI-V
DROP.The
adjustable output voltage VO2 is set by a resistor divider connected between VO2 (pin4) and Ground (pin3) with its centre tap connected to
VO2 ADJ (pin2). The voltage divider resistors are: R1connected to VO2 and VO2 ADJ and R2connected to VO2 ADJ and GND. VO2 is deter-
mined by VREF,R
1
,R
2
, and IADJ as follows (for more details see the Application Hints section):
VO2 =V
REF (1+R1/R2)+I
ADJR1
ST2L05
6/24
OUTPUT1 AND OUTPUT2 DUAL SPECIFICATION (IO=10mAto1A,T
J= 0 to 125°C, VI=4.5Vto7V,
C
I=4.7µF,C
O1 =C
O2 =4.7µF, otherwise specified)
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 1.5V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
IGND Quiescent Current (Fixed/ADJ) VI≤7V IOUT1,2 = 5mA to 1A 5 mA
IGND Quiescent Current (Fixed/Fixed) VI≤7V IOUT1,2 = 5mA to 1A 7 mA
IST Total Current Limit IO1 +I
O2 2A
T
SHDN Thermal Shutdown 175 °C
DTSHDN Thermal Shutdown Hysteresis 5 °C
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 1.5V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 1.47 1.5 1.53 V
VOOutput Voltage 1.5V IO= 5mA to 1A, VI= 4.75 to 5.25V 1.455 1.5 1.545 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
7/24
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 1.8V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 1.8V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 1.764 1.8 1.836 V
VOOutput Voltage 1.8V IO= 5mA to 1A, VI= 4.75 to 5.25V 1.746 1.8 1.854 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
8/24
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 2.5V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 2.5V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 2.45 2.5 2.55 V
VOOutput Voltage 2.5V IO= 5mA to 1A, VI= 4.75 to 5.25V 2.425 2.5 2.575 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
9/24
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 2.8V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 2.8V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 2.744 2.8 2.856 V
VOOutput Voltage 2.8V IO= 5mA to 1A, VI= 4.75 to 5.25V 2.716 2.8 2.884 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
10/24
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 3.0V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 3.0V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 2.94 3.0 3.06 V
VOOutput Voltage 3.0V IO= 5mA to 1A, VI= 4.75 to 5.25V 2.91 3.0 3.09 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
11/24
ELECTRICAL CHARACTERISTICS OF FIXED OUTPUT 3.3V (IO=10mAto1A,T
J= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOOutput Voltage 3.3V IO= 5mA to 1A, VI= 4.75 to 5.25V
T = 25°C 3.234 3.3 3.366 V
VOOutput Voltage 3.3V IO= 5mA to 1A, VI= 4.75 to 5.25V 3.2 3.3 3.4 V
∆VOLine Regulation VI= 4.75 to 5.25V, IO= 5mA to 1A 15 mV
∆VOLoad Regulation VI= 4.75V, IO= 10mA to 1A 12 mV
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IOMIN Min Output Current for
regulation 0mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O
/∆I
OTransient Response
Change of VOwith step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO1/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO/∆IOTransient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
12/24
ELECTRICAL CHARACTERISTICS OF ADJUSTABLE OUTPUT (IO= 10mA to 1A, TJ= 0 to 125°C,
VI=4.5Vto7V,C
I= 4.7µF, CO1 =C
O2 =4.7µF, otherwise specified)
NOTE 1: Bandwidth of 10 Hz to 10KHz.
NOTE 2: 120Hz input ripple.
NOTE 3: CI= 20µF, C1and CO2 = 10µF. CI,C
O1 and CO2 are all X7R ceramic capacitors.
NOTE 4: Guaranteed by design, not tested in production.
NOTE 5: % undershoot or overshoot of VO.
APPLICATION HINTS
EXTERNAL CAPACITORS
Like any low-dropout regulator, the ST2L05 requires external capacitors for stability. We suggest
soldering both capacitors as close as possible to the relative pins (1, 4 and 5).
INPUT CAPACITOR
An input capacitor, whose value is, at least, 2.2µF is required; the amount of the input capacitance can be
increased without limit if a good quality tantalum or aluminium capacitor is used.SMD X7R or Y5V ceramic
multilayer capacitors could not ensure stability in any condition because of their variable characteristics
with Frequency and Temperature; the use of this capacitor is strictly related to the use of the output
capacitors. For more details read the “OUTPUT CAPACITOR SECTION”.The input capacitor must be
located at a distance of not more than 0.5" from the input pin of the device and returned to a clean analog
ground.
OUTPUT CAPACITOR
The ST2L05 is designed specifically to work with Ceramic and Tantalum capacitors.Special care must be
taken when a Ceramic multilayer capacitor is used.Due to their characteristics they can sometimes have
an ESR value lower than the minimum required by the ST2L05 and their relatively large capacitance can
Symbol Parameter Test Conditions Min. Typ. Max. Unit
VOReference Voltage IO= 5mA to 1A, VI= 4.75 to 5.25V,
T = 25°C 1.225 1.25 1.275 V
VOReference Voltage IO= 5mA to 1A, VI= 4.75 to 5.25V 1.212 1.25 1.287 V
∆VO2 Line Regulation 2 VI= 4.75 to 5.25V, IO= 5mA to 1A 0.35 %
∆VO2 Load Regulation 2 VI= 4.75V, IO= 10mA to 1A 0.4 %
VDDropout Voltage ∆VO= -1% IO= 1A 1.3 V
ISCurrent Limit VI= 5.5V 1 A
IADJ Adjustable Current (sinking) 1 µA
I∆ADJ Adjustable Current Change IO= 10mA to 1A 200 nA
IOMIN Min Output Current for
regulation 2mA
e
NRMS Output Noise (1)(4) T = 25°C 0.003 %
SVR Supply Voltage
Rejection (2)(4) VI=5V 60 dB
∆V
O2/∆IO2 Transient Response
Change of VO1 with step
load change(3)(4)
VI=5V, I
O= 1mA to 1A, tr≥ 1µs 10(5) %
VI=5V, I
O=1Ato1mA, t
f≥ 1µs 10(5)
∆VO2/∆VITransient Response
Change of VOUT1 with
application of VI(3)(4)
0 to 5V step input, IO= 1mA to 1A,
tr≥ 1µs 10(5) %
∆VO2/∆IO2 Transient Response Short
Circuit Removal
Response (3)(4)
VI=5V, I
O= short to IO= 10mA 20(5) %
TRThermal Regulation (4) IO= 1A, tPULSE = 30ms 0.1 %/W
STemperature Stability (4) 0.5 %
SLong Term Stability (4)
(1000Hrs) TJ= 125°C 0.3 %
ST2L05
13/24
change a lot depending on the ambient temperature.The test results of the ST2L05 stability using
multilayer ceramic capacitors show that a minimum value of 2.2µF is needed for both regulators. This
value can be increased without limit if the input capacitor value is major or equal to 4.7µF, and up to 10µF
if the input capacitor is minor than 4.7µF.Surface-mountable solid tantalum capacitors offer a good
combination of small physical size for the capacitance value and ESR in the range needed by the ST2L05.
The test results show good stability for both outputs with values of at least 1µF. The value can be
increased without limit for even better performance such as transient response and noise.
IMPORTANT:
The output capacitor must maintain its ESR in the stable region over the full operating temperature to
assure stability. More over, capacitor tolerance and variations due to temperature must be considered to
assure that the minimum amount of capacitance is provided at all times. For this reason, when a Ceramic
multilayer capacitor is used, the better choice for temperature coefficient is the X7R type, which holds the
capacitance within ±15%. The output capacitor should be located not more than 0.5" from the output pins
of the device and returned to a clean analog ground.
ADJUSTABLE REGULATOR
The ST2L05 has a 1.25V reference voltage between the output and the adjust pins (respectively pin 4 and
2). When a resistor R1is placed between these two terminals, a constant current flows through R1and
down to R2to set the overall (VO2 to GND) output voltage. Minimum load current is 2mA max in all
temperature conditions.
APPLICATION CIRCUIT
VO=V
REF(1+R1/R2)+IADJR1
IADJ is very small (typically 35µA) and constant: in the VOcalculation it can be ignored.
ST2L05
14/24
TYPICAL CHARACTERISTICS
Figure 1 : Reference Voltage vs Temperature
Figure 2 : Reference Line Regulation vs
Temperature
Figure 3 : Reference Load Regulation vs
Temperature
Figure 4 : Reference Voltage vs Input Voltage
Figure 5 : Dropout Voltage vs Temperature
(Adjustable Output)
Figure 6 : Dropout Voltage vs Input Voltage
(Adjustable Output)
ST2L05
15/24
Figure 7 : Minimum Load Current vs
Temperature (Adjustable Output)
Figure 8 : Adjust Pin Current vs Temperature
(Adjustable Output)
Figure 9 : Output Voltage vs Temperature
Figure 10 : Line Regulation vs Temperature
Figure 11 : Load Regulation vs Temperature
Figure 12 : Output Voltage vs Input Voltage
ST2L05
16/24
Figure 13 : Dropout Voltage vs Temperature
(Fixed Output)
Figure 14 : Dropout Voltage vs Input Voltage
Figure 15 : Supply Voltage Rejection vs
Temperature
Figure 16 : Supply Voltage Rejection vs
Frequency
Figure 17 : Quiescent Current vs Temperature
(Fixed/ADJ Version)
Figure 18 : Quiescent Current vs Temperature
(Fixed/Fixed Version)
ST2L05
17/24
Figure 19 : Short Circuit Removal Response
Figure 20 : Change of VOwith Step Load
Change
Figure 21 : Change of VOwith Step Load
Change
Figure 22 : Change of VOwith Step Load
Change
Figure 23 : Short Circuit Removal Response
Figure 24 : Change of VOwith Step Load
Change
V
I=5
V
,
I
O=s
h
ort c
i
rcu
i
tto
10
m
A
,
C
O
=
10
µ
F
,
C
I
=
22
µ
F
a
ll
ceram
i
c
X5R, TJ=25°C
V
I=5
V
,
I
O=
1
m
A
to
1A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C
V
I=5
V
,
I
O=
1
m
A
to
1A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C, tRISE=1µs
V
I=5
V
,
I
O=
1A
to
1
m
A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C, tFALL=1µs
V
I=5
V
,
I
O=s
h
ort c
i
rcu
i
tto
10
m
A
,
C
O
=
10
µ
F
,
C
I
=
22
µ
F
a
ll
ceram
i
c
X5R, TJ=25°C
V
I=5
V
,
I
O=
1
m
A
to
1A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C, tRISE=1µs
ST2L05
18/24
Figure 25 : Change of VOwith Step Load
Change
Figure 26 : Change of VOwith Step Load
Change
Figure 27 : Start-Up Transient
Figure 28 : Start-Up Transient
V
I=5
V
,
I
O=
1
m
A
to
1A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C, tRISE=tFALL=1µs
V
I=5
V
,
I
O=
1A
to
1
m
A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
TJ=25°C, tFALL=1µs
V
I=
0
to5
V
,
I
O=
1
m
A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
T
J=
2
5
°C
,
tRISE ≤1µs
V
I=
0
to 5
V
,
I
O=
1A
,
C
O=
10
µ
F
,
C
I=
22
µ
F
a
ll
ceram
i
c
X
5
R
,
T
J=
2
5
°C
,
tRISE ≤1µs
ST2L05
19/24
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.78 2.03 0.070 0.080
A2 0.03 0.13 0.001 0.005
C 0.25 0.010
C1 0.25 0.010
D 1.02 1.27 0.040 0.050
D1 7.87 8.13 0.310 0.320
F 0.63 0.79 0.025 0.031
G 1.69 0.067
G1 6.8 0.268
H1 5.59 0.220
H2 9.27 9.52 0.365 0.375
H3 8.89 9.14 0.350 0.360
L 10.41 10.67 0.410 0.420
L1 7.49 0.295
L2 8.89 9.14 0.350 0.360
M 0.79 1.04 0.031 0.041
N 0.25 0.010
V3˚ 6˚3˚ 6˚
SPAK-5L MECHANICAL DATA
PO13F1/B
ST2L05
20/24
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 2.2 2.4 0.086 0.094
A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009
B 0.4 0.6 0.015 0.023
B2 5.2 5.4 0.204 0.212
C 0.45 0.6 0.017 0.023
C2 0.48 0.6 0.019 0.023
D 6 6.2 0.236 0.244
E 6.4 6.6 0.252 0.260
G 4.9 5.25 0.193 0.206
G1 2.38 2.7 0.093 0.106
H 9.35 10.1 0.368 0.397
L2 0.8 0.031
L4 0.6 1 0.023 0.039
PPAK MECHANICAL DATA
0078180-B
ST2L05
21/24
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 0.80 0.90 1.00 0.032 0.035 0.039
A1 0.02 0.005 0.001 0.002
A3 0.20 0.008
b 0.35 0.40 0.47 0.014 0.016 0.018
D 5.00 0.197
D2 4.15 4.2 4.25 0.163 0.165 0.167
E 6.00 0.236
E2 3.55 3.6 3.65 0.140 0.142 0.144
e 1.27 0.049
F 1.99 0.078
G 2.20 0.086
H 0.40 0.015
I 0.219 0.0086
L 0.70 0.90 0.028 0.035
DFN8 (5x6) MECHANICAL DATA
7286463/B
ST2L05
22/24
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 180 7.086
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N 60 2.362
T 14.4 0.567
Ao 9.70 9.80 9.90 0.382 0.386 0.390
Bo 10.85 10.95 11.05 0.423 0.427 0.431
Ko 2.30 2.40 2.50 0.090 0.094 0.098
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 11.9 12.0 12.1 0.468 0.472 0.476
Tape & Reel SPAK-xL MECHANICAL DATA
ST2L05
23/24
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.0 13.2 0.504 0.512 0.519
D 20.2 0.795
N 60 2.362
T 14.4 0.567
Ao 6.80 6.90 7.00 0.268 0.272 0.2.76
Bo 10.40 10.50 10.60 0.409 0.413 0.417
Ko 2.55 2.65 2.75 0.100 0.104 0.105
Po 3.9 4.0 4.1 0.153 0.157 0.161
P 7.9 8.0 8.1 0.311 0.315 0.319
Tape & Reel DPAK-PPAK MECHANICAL DATA
ST2L05
24/24
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its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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