AIC1742
Low Noise, Low Quiescent Current,
150mA Linear Regulator with Noise Bypass
Analog Integrations Corporation Si-Soft Research Center DS-1742P-02 010405
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
FEATURES
Very Low Noise, 25μVRMS @ f=10~100kHz.
Very Low Quiescent Current, 35μA.
Very Low Dropout Voltage, 90mV @ 50mA.
Active Low Shutdown Control.
Short Circuit and Thermal Protection.
1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 2.85V, 2.9V, 3.0V,
3.3V Output Voltage.
Available in ±2% Output Tolerance.
Low Profile Package: SOT-23-5
APPLICATIONS
Cellular Telephones.
Pagers.
Personal Communication Equipment.
Cordless Telephones.
Portable Instrumentation.
Portable Consumer Equipment.
Radio Control Systems.
Low Voltage Systems.
Battery Powered Systems
DESCRIPTION
AIC1742 is a low noise, low dropout linear
regulator, and is housed in a small SOT-23-5
package. The device is in the “ON” state when
the SHDN pin is set to logic high level. A low
dropout voltage of 90mV at 50mA load current
is performed. It offers high precision output
voltage of ±2%. The quality of low quiescent
current and low dropout voltage makes this
device ideal for battery power applications.
The internal reverse bias protection eliminates
the requirement for a reverse voltage
protection diode. The high ripple rejection and
low noise of AIC1742 provide enhanced
performance for critical applications. The
noise bypass pin can be connected an
external capacitor to reduce the output noise
level.
TYPICAL APPLICATION CIRCUIT
CIN
1µF
VIN
BP
VOUT
SHDN
GND
VIN
AIC1742
COUT
2.2µF
CBP
0.01
µ
F
VSHDN
VOUT
* CIN : TAIYO YUDEN, CEJMK107BJ105MA-T
*COUT : TAIYO YUDEN, CEJMK107BJ225Mθ-T
Low Noise Low Dropout Linear Regulator
TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1
AIC1742
ORDERING INFORMATION
PIN CONFIGURATION
Example: AIC1742-15ACVTR
1.5V Version, in SOT-23-5 Package & Tape &
Reel Packing Type
AIC1742-15APVTR
1.5V Version, in SOT-23-5 Lead Free
Package & Tape & Reel Packing Type
AIC1742-XXX XXX XX
PACKING TYPE
TR: TAPE & REEL
BG: BAG
C: COMMERCIAL
ACV: SOT-23-5
BCV: SOT-23-5
P: LEAD FREE COMMERCIAL
APV: SOT-23-5
BPV: SOT-23-5
OUTPUT VOLTAGE
15: 1.5V
18: 1.8V
20: 2.0V
25: 2.5V
28: 2.8V
285: 2.85V
29: 2.9V
30: 3.0V
33: 3.3V
(Of a unit of 0.1V within the voltage
range from 1.5V to 3.3V, additional
voltage versions for this product line
may be available on demand with prio
r
consultation with AIC.)
3
2 1
45
SOT-23-5
FRONT VIEW
(AXV)
1. VIN
2. GND
3. SHDN
4. BP
5. VOUT
(BXV)
1. VOUT
2. GND
3. VIN
4. SHDN
5. BP
2
AIC1742
• SOT-23-5 Marking
Part No. ACV APV Part No. BCV BPV
AIC1742-15AXV ER15 ER15P AIC1742-15BXV ES15 ES15P
AIC1742-18AXV ER18 ER18P AIC1742-18BXV ES18 ES18P
AIC1742-20AXV ER20 ER20P AIC1742-20BXV ES20 ES20P
AIC1742-25AXV ER25 ER25P AIC1742-25BXV ES25 ES25P
AIC1742-28AXV ER28 ER28P AIC1742-28BXV ES28 ES28P
AIC1742-285AXV ER2J ER2JP AIC1742-285BXV ES2J ES2JP
AIC1742-29AXV ER29 ER29P AIC1742-29BXV ES29 ES29P
AIC1742-30AXV ER30 ER30P AIC1742-30BXV ES30 ES30P
AIC1742-33AXV ER33 ER33P AIC1742-33BXV ES33 ES33P
ABSOLUTE MAXIMUM RATINGS
Supply Voltage 9V
Shutdown Terminal Voltage .9V
Power Dissipation 500mW
Operating Temperature Range -40ºC~85ºC
Maximum Junction Temperature 125°C
Storage Temperature Range -65ºC~150ºC
Lead Temperature (Soldering, 10 sec) 260°C
Thermal Resistance Junction to Case 130ºC/W
Thermal Resistance Junction to Ambient 220ºC/W
(Assume no ambient airflow, no heatsink)
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT
3
AIC1742
ELECTRICAL CHARACTERISTICS
(TJ=25°C, unless otherwise specified) (Note1)
PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
Quiescent Current VIN = VOUT+ 1V,
VSHDN=1.6V, IOUT = 0mA IQ 35 45
µA
Standby Current VIN = VOUT+ 1V to 8V,
VSHDN=0.6V, Output OFF ISTBY 0.1
µA
GND Pin Current IOUT = 50mA IGND 2.5 3.5 mA
Continuous Output Current VIN = VOUT + 1V to 8V IOUT 150 mA
Output Current Limit VIN = VOUT + 1V, VOUT = 0V IIL 150 250 mA
Output Voltage Tolerance VIN = VOUT + 1V, no load VOUT -2 2 %
Temperature Coefficient TC 50 150 ppm/ºC
Line Regulation VIN = VOUT（TYP） + 1V to 8V ∆VLIR 2 5 mV
Load Regulation VIN = 5V,
IOUT = 0.1~150mA ∆VLOR 0.005 0.01 %/mA
IOUT = 50 mA 90 160
IOUT = 100 mA 140 230
IOUT = 150 mA
Vout≥2.5V
200 350
Dropout Voltage
IOUT = 150 mA Vout<2.5V
VDROP
500 800
mV
Noise Bypass Terminal
Voltage VREF 1.25 V
Ripple Rejection f=1KHz, Ripple=0.5VP-P,
CBP = 0.1µF RR 65 dB
Output Noise CBP = 0.1µF, f = 10~100KHz еn 25
µVrms
SHUTDOWN TERMINAL SPECIFICATIONS
Shutdown Pin Current VSHDN=1.6V ISHDN 2
µA
Shutdown Pin Voltage (ON) Output ON VSHDN
（ON）1.6 V
Shutdown Pin Voltage (OFF) Output OFF VSHDN
（OFF） 0.6 V
Shutdown Exit Delay Time CBP = 0.1µF, COUT = 1µF,
IOUT=30mA △t 300 µS
Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 2: The dropout voltage is defined as VIN – VOUT when VOUT is 1% below the value of VOUT for
VIN = VOUT + 0.5V. (Only applicable for VOUT = 2.5V ~ 5V)
4
AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS
2 3 4 5 6 7 8 910
0
10
20
30
40
50
60
Fig. 1 Quiescent Current
Quiescent Current (µA)
Input Voltage (V)
A
IC1742
TA=25°C
VSHDN=1.6V
IOUT=0mA
Fig. 2 Ground Current
Ground Current (mA)
020 40 60 80 100 120 140
0
2
4
6
8
10
12
14
Output Current (mA)
TA=25°C
A
IC1742
Fig. 3 Short-Circuit Current
Short-Circuit Current
(
mA
)
0 1 2 3 4 5 6 7
0
50
100
150
200
250
300
350
Input Voltage (V)
A
IC1742
T=25°C
Fig. 4 Output Voltage
Output Voltage Deviation (%)
-40 -20 020 40 60 80 100 120
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
A
IC1742-33
A
IC1742-15
Temperature
(
°
C)
VIN=5V
VSHDN=1.6V
IOUT=0mA
Fig. 5 Load Regulation
Load Regulation (mV)
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
0
5
10
15
20
25
30
35
A
IC1742-33
A
IC1742-15
Output Current (mA)
A
IC1742
VIN=5V
VSHDN=1.6V
TA=25°C
Load Regulation (mV)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
0
10
20
30
40
50
IOUT=100mA
IOUT=150mA
Fig. 6 Load Regulation
Input Voltage (V)
A
IC1742-15
VSHDN=1.6V
TA=25°C
5
AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Fig. 7 Load Regulation
Load Regulation (mV)
3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0
18
20
22
24
26
28
30
32
34
IOUT=100mA
Input Voltage (V)
VSHDN=1.6V
TA=25°C
IOUT=150mA
A
IC1742-33
Dropout Voltage (mV)
Fig. 8 Dropout Voltage
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
0
50
100
150
200
250
300
Out
p
ut Current
(
mA
)
TA=25°C
A
IC1742-25
Dropout Voltage (mV)
Fig. 9 Dropout Voltage
Out
p
ut Current
(
mA
)
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
0
100
200
300
400
500
600
700
800
TA=25°C
A
IC1742-20
Ripple Rejection (dB)
Fig. 10 Input Ripple Rejection
10 10
2
10
3
10
4
10
5
10
6
0
20
40
60
80
100
COUT=2.2µF Ceramic
IOUT=0mA
CBP=0.1µF
Frequency (Hz)
CBP=0.01µF
A
IC1742-20
Ripple Rejection (dB)
Fig. 11 Input Ripple Rejection
0
20
40
60
80
100
Frequency (Hz)
COUT=2.2µF Ceramic
IOUT=0mA
CBP=0.1µF CBP=0.01µF
A
IC1742-30
10 10
2
10
3
10
4
10
5
10
6
Ripple Rejection (dB)
Fig. 12 Input Ripple Rejection
Frequency (Hz)
0
20
40
60
80
100
COUT=2.2µF Ceramic
IOUT=100mA
CBP=0.01µF
CBP=0.1µF
AIC1742-20
10 10
2
10
3
10
4
10
5
10
6
6
AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Ripple Rejection (dB)
Fig. 13 Input Ripple Rejection
Frequency (Hz)
10 10
2
10
3
10
4
10
5
10
6
0
20
40
60
80
100
COUT=2.2µF Ceramic
IOUT=100mA
CBP=0.01µF
CBP=0.1µF
A
IC1742-30
Fig. 14 Shutdown Delay
VSHDN, 2V/Div
VOUT, 1V/Div
1↓2↓
1) Ch 1: 500 mVolt 25 us
2) Ch 2: 20 mVolt 25 us
Fig. 15 Line Transient Response
Vout, 20mV/Div
Vin, 500mV/Div
VIN=3.5~4.5V VOUT=2.5V
COUT=2.2µF Ceramic
IOUT=60mA
1
↓
2
↓
1) Ch 1: 500 mVolt 100 us
2) Ch 2: 20 mVolt 100 us
Fig. 16 Line Transient Response
Vout, 20mV/Div
Vin, 500mV/Div
VIN=4.5~3.5V VOUT=2.5V
COUT=2.2µF Ceramic
IOUT=60mA
1↓
2 >
1) Ch 1: 20 mVolt 10 us
2) Ch 2: 10 mVolt 10 us
Fig. 17 Transient Response 2
VIN=5V VOUT=2.5V
COUT=2.2µF Ceramic
IOUT=0~100mA
Vout, 20mV/Div
Iout, 50mA/Div
1
↓
2
>
1) Ch 1: 20 mVolt 10 us
2) Ch 2: 10 mVolt 10 us
Fig. 18 Load Transient Response
VIN=5V VOUT=2.5V
COUT=2.2µF Ceramic
Iout=0~100mA
CH1:20mV/Div
Iout, 50mA/Div
7
AIC1742
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
Output Noise (µV)
Fig. 19 Output Noise RMS
Output Current (mA)
0.1 1 10 100
0
10
20
30
40
50
60
A
IC1742-15
A
IC1742-33
COUT=4.7µF Ceramic
CNB=0.01µF
f=10Hz to 100KHz
BLOCK DIAGRAM
Amp
Error
VOUT
BP
Circuit
Bias
Circuit
Disconnect
VIN
SHDN Circuit
Control
1.25V
REF
Limit
Current Thermal
Shutdown
-
+
GND
PIN DESCRIPTIONS
VIN PIN - Power supply input pin. Bypass
with a 1µF capacitor to GND.
BP PIN - Noise bypass pin. An external
bypass capacitor connecting to BP
pin to reduce noises at the output.
GND PIN - Ground pin.
SHDN PIN - Active-Low shutdown input pin. VOUT PIN - Output pin. Sources up to 150 mA.
8
AIC1742
9
DETAILED DESCRIPTION OF TECHNICAL TERMS
DROPOUT VOLTAGE (VDROP)
The dropout voltage is defined as the difference
between the input voltage and output voltage at
which the output voltage drops 100mV. Below
this value, the output voltage will fall as the input
voltage reduces. It depends on the load current
and junction temperature.
LINE REGULATION
Line regulation is the ability of the regulator to
maintain a constant output voltage as the input
voltage changes. The line regulation is specified
as the input voltage changes from VIN = VOUT +
1V to VIN = 8V and IOUT = 1mA.
LOAD REGULATION
Load regulation is the ability of the regulator to
maintain a constant output voltage as the load
current changes. A pulsed measurement with an
input voltage set to VIN = VOUT + VDROP can
minimize temperature effects. The load
regulation is specified by the output current
ranging from 0.1mA to 150mA.
QUIESCENT CURRENT (IQ)
Quiescent current is the current flowing through
ground pin with no output load.
GROUND CURRENT (IGND)
Ground current is the current flowing through the
ground pin with output load.
STANDBY CURRENT (ISTBY)
Standby current is the current flowing into the
regulator when the output is shutdown by setting
VSHDN at 0V and VIN at 8 V.
CURRENT LIMIT (IIL)
Current limiting of AIC1742 monitors and controls
the maximum output current, in case of a shorted
output. It protects device from the damage
resulting from any unexpected current.
RIPPLE REJECTION (RR)
Ripple rejection is the ability of the regulator to
reduce voltage ripple, which comes from input, at
output terminal. It is specified with a signal of
0.5VP-P at 1KHz frequency applying to input,
output capacitor at 2.2µF as well as a noise
bypass of 0.1µF. Ripple rejection, expressed in
dB, is the ratio of output ripple to input.
THERMAL PROTECTION
Thermal sensor protects device when the
junction temperature exceeds TJ= +155ºC. It
signals shutdown logic, turning off pass transistor
and allowing IC to cool down. After the IC’s
junction temperature cools by 15ºC, the thermal
sensor will turn the pass transistor back on.
Thermal protection is designed to protect the
device in the event of fault conditions. For a
continuous operation, do not exceed the absolute
maximum junction-temperature rating of TJ=
150ºC, or damage may occur to the device.
AIC1742
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear regulators require input and output
capacitors to maintain stability. Input capacitor
at 1µF with 1uF aluminum electrolytic or 2.2µF
ceramic output capacitor is recommended. And
it should be selected within the Equivalent
Series Resistance (ESR) range as shown in
the figure 20,21. ESR of ceramic capacitor is
lower and its electrical characteristics
(capacitance and ESR) vary widely over
temperature. In general, tantalum or electric
output capacitor is suggested for heavy load.
Normally, the output capacitor should be 1µF
(aluminum electrolytic) at least and rates for
operating temperature range. Note that it’s
important to check selected manufactures
electrical characteristics (capacitance and ESR)
over temperature.
NOISE BYPASS CAPACITOR
0.01µF bypass capacitor at BP pin reduces
output voltage noise. And the BP pin has to
connect a capacitor to GND.
POWER DISSIPATION
The maximum power dissipation of AIC1742
depends on the thermal resistance of its case
and circuit board, the temperature difference
between the die junction and ambient air, and
the rate of airflow. The rate of temperature rise
is greatly affected by the mounting pad
configuration on the PCB, the board material,
and the ambient temperature. When the IC
mounting with good thermal conductivity is
used, the junction temperature will be low even
when large power dissipation applies.
The power dissipation across the device is
P = IOUT (VIN-VOUT).
The maximum power dissipation is:
)Rθ(Rθ
)T(T
P
BAJB
AJ
MAX +
−
=
Where TJ-TA is the temperature difference
between the die junction and the surrounding
air, RθJB is the thermal resistance of the
package, and RθBA is the thermal resistance
through the PCB, copper traces, and other
materials to the surrounding air.
As a general rule, the lower temperature is, the
better reliability of the device is. So the PCB
mounting pad should provide maximum
thermal conductivity to maintain low device
temperature.
GND pin performs a dual function of providing
an electrical connection to ground and
channeling heat away. Therefore, connecting
the GND pin to ground with a large pad or
ground plane would increase the power
dissipation and reduce the device temperature.
10
AIC1742
11
Serial Resistor (Ω)
F
COUT ESR (Ω)
ent
020 40 60 80 100 120 140
0.01
0.1
1
10
100
Stable Region
COUT=4.7µF
COUT=2.2µF
ig. 20 Stable Region with extra Serial Resistor vs.
Load Current
Load Current (mA)
0 20 40 60 80 100 120 140
1
Fig. 21 Region of Stable COUT ESR vs. Load Curr
Load Current (mA)
0.0
0.1
10
100
Stable Region
COUT=1µF
PHYSICAL DIMENSIONS
SOT-23-5 (unit: mm)
c
A
A2
b
WITH PLATING
VIEW B
θ
L1
L
SEATING PLANE
GAUGE PLANE
0.25
A1
SECTION A-A
BASE METAL
e1
D
E
AA
E1
SEE VIEW B
e
0°
0.90
0.30
1.50
2.60
2.80
0.08
0.30
0.05
e
θ
L1
L
e1
c
E
E1
D
b
A2
A1
0.95 BSC
8°
0.60
1.90 BSC
0.60 REF
1.30
1.70
3.00
3.00
0.22
0.50
0.15
0.95
MIN.
S
Y
M
B
O
L
A1.45
MAX.
SOT-25
MILLIMETERS
AIC1742
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any
circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties
that may result from its use. We reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or
systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose
failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably
expected to result in a significant injury to the user.
12