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AS1353
,
AS1356
L i n e a r L o w - D r o p o u t 1 5 0 m A Vo l ta g e R e g u l a t o r s
Data Sheet
1 General Description
The AS1353/AS1356 are high-performance, fixed-volt-
age linear LDOs designed for use with capacitors of 1 to
10µF. The devices can deliver superior performance
even under low dropout conditions when the power tran-
sistor operates in linear mode.
The integrated P-channel MOSFET output allows the
devices to maintain a low supply-current at loads of up
to150mA. A shutdown mode includes logic-controlled
circuitry which reduces shutdown current to less than
1µA (max).
Integrated over-temperature and over-current protec-
tion circuitry switches the devices off in case of thermal
overload or output short-circuit conditions.
2 Key Features
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Ultra-Low Dropout Voltage: 40mV @ 100mA load
Output Voltage Range: +1.5 to +3.6V (100mV steps)
Max Output Current: 150mA
Output Voltage Accuracy: ±1%
Low Shutdown Current: 1µA
High PSRR: 60dB at 100Hz
The AS1353/AS1356 are optimized for low equivalent-
series resistance (ESR) output capacitors. Additionally,
all devices contain reversed battery protection which dis-
connects the internal circuitry and parasitic diodes if the
battery is connected incorrectly.
The AS1356 also features power-OK circuitry which can
be used to monitor output regulation.
All devices also feature an integrated error amplifier and
built-in 1.25V reference, and output current is limited
(380mA typ) via the on-chip current limiting circuitry.
Multiple output voltages are available as standard prod-
ucts: 3.6, 3.3, 3.0, 2.7, 2.5, or 1.5V. All devices are avail-
able in a 5-pin SOT23 package.
Figure 1. Pinout and Application Diagrams
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+2.5 to
+5.5V
On
Off
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Power-OK Output (AS1356)
Minimal External Components Required
5-pin SOT23 Package
Integrated Overtemperature/Overcurrent Protection
Reverse-Battery Protection (AS1353/AS1356)
Operating Temperature Range: -40 to +85°C
3 Applications
The devices are ideal for powering cordless and mobile
phones, MP3 players, CD and DVD players, PDAs,
handheld computers, digital cameras, and any other
hand-held and/or battery-powered device.
IN 1
5 OUT
IN 1
GND 2
3
AS1353
GND 2
3
AS1356
SHDNM
4 BP
SHDNM
4 POK
IN
OUT
C
IN
1µF
AS1353
SHDNM
BP
GND
C
OUT
1µF
Preset Output
1.5 to 3.6V,
150mA
+2.5 to
+5.5V
IN
C
IN
1µF
OUT
C
OUT
1µF
AS1356
On
Off
SHDNM
GND
POK
100kΩ
To Micro-
processor
C
BP
0.01µF
Revision 1.03
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5 OUT
Preset Output
1.5 to 3.6V,
150mA
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AS1353/AS1356
Data Sheet
- P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
SHDNM
3
4 BP
SHDNM
3
Pin Descriptions
Pin Number
1
2
3
4
5
Table 1. AS1353 Pin Descriptions
Table 2. AS1356 Pin Descriptions
Pin Number
1
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Pin Name
IN
Description
GND
SHDNM
BP
OUT
Pin Name
IN
Description
2
3
GND
SHDNM
4
POK
5
OUT
Revision 1.03
LDO Input.
Supply voltage can range from 2.5 to 5.5V. Bypass with a 1µF
capacitor to GND (see Capacitor Selection and Regulator Stability on page 10).
Ground.
This pin also functions as a heat sink. Solder to a large pad or the
circuit-board ground plane to maximize power dissipation.
Active-Low Shutdown Input.
A logic low reduces the supply current to < 1µA.
Note:
Connect to IN for normal operation.
Reference-Noise Bypass.
Bypass with a low-leakage, 0.01µF ceramic
capacitor for reduced noise at the output.
LDO Output.
Fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6V output. Sources up to
150mA.
LDO Input.
Input voltage can range from 2.5 to 5.5V. Bypass with 1µF to GND
(see Capacitor Selection and Regulator Stability on page 10).
Ground.
This pin also functions as a heat sink. Solder to a large pad or the
circuit-board ground plane to maximize power dissipation.
Active-Low Shutdown Input.
A logic low reduces the supply current to < 1µA.
Note:
Connect to pin IN for normal operation.
Power-OK Output.
Active-low, open-drain output indicates an out-of-regulation
condition. Connect a 100kΩ pull-up resistor to pin OUT for logic levels.
Note:
Leave this pin unconnected if the power-OK feature is not used.
LDO Output.
Fixed 1.5, 2.5, 2.7, 3.0, 3.3, and 3.6V output. Sources up to
150mA.
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GND 2
AS1353
GND 2
AS1356
id
IN 1
5 OUT
IN 1
5 OUT
AS1353/AS1356
Data Sheet
- A b s o l u t e
Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in Section 6 Electrical
Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may
affect device reliability.
Table 3. Absolute Maximum Ratings
IN, SHDNM to GND
SHDNM to IN
POK, BP, OUT to GND
Output Short-Circuit Duration
Continuous Power Dissipation
(T
AMB
= +70ºC)
Operating Temperature Range
Junction Temperature
Θ
JA
-40
-7
-7
-0.3
Indefinite
571
+85
+7
+0.3
V
IN
+
+0.3
V
V
V
V
mW
ºC
Derate 7.1mW/ºC above +70ºC
Storage Temperature Range
Package Body Temperature
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+150
ºC
Internally limited
+140
ºC/W
ºC
-65
+150
+260
ºC
Revision 1.03
The reflow peak soldering temperature
(body temperature) specified is in
accordance with
IPC/JEDEC J-STD-020C
“Moisture/Reflow Sensitivity Classification
for non-hermetic Solid State Surface
Mount Devices”
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Parameter
Min
Max
Typ
Units
Comments
AS1353/AS1356
Data Sheet
- E l e c t r i c a l
Characteristics
6 Electrical Characteristics
(V
IN
= V
OUT(Nominal)
+ 1V, SHDNM = IN, T
AMB
= -40 to +85ºC (unless otherwise specified). Typical values are at T
AMB
=
+25ºC. Limits are 100% production tested at T
AMB
= +25ºC.
Table 4. Electrical Characteristics
Symbol
V
IN
Parameter
Input Voltage
Output Voltage Accuracy
I
OUT
I
LIM
I
Q
Maximum Output Current
Current Limit
Ground Pin Current
I
OUT
= 100µA
I
OUT
= 150mA
I
OUT
= 100µA
I
OUT
= 50mA
I
OUT
= 100mA
I
OUT
= 150mA
V
IN
= 2.5V or (V
OUT
+ 0.1) to 4.5V,
I
OUT
= 1mA
V
IN
= 2.5V or (V
OUT
+ 0.1) to 5.5V,
I
OUT
= 1mA
I
OUT
= 100µA to 150mA, C
OUT
= 1µF
C
OUT
= 1µF,
f = 10Hz to 100kHz,
AS1353
C
BP
= 0.01µF
C
OUT
= 1µF,
AS1356
f = 10Hz to 100kHz
f = 100Hz, C
OUT
= 1µF,
(C
BP
= 0.01µF, AS1353)
Conditions
T
AMB
= +25ºC, I
OUT
= 100µA
T
AMB
= -40 to +85ºC, I
OUT
= 100µA to 150mA
Min
2.5
-1
-3
150
160
Typ
Max
5.5
1
3
Unit
V
V
IN
-V
OUT
Dropout Voltage
1
ΔV
LNR
ΔV
LDR
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-0.2
-0.8
0
0
Line Regulation
Load Regulation
30
Output Voltage Noise
110
60
Output Voltage AC
Power-Supply Rejection
Ratio
Exit Delay from
34
Shutdown ,
2
380
70
115
0.05
20
40
60
en
PSRR
Shutdown
t
ON
C
BP
= 0.01µF, no load
(AS1353)
SHDNM = GND
I
OFF
V
IH
V
IL
Shutdown Supply
Current
T
AMB
= +25ºC
T
AMB
= +85ºC
SHDNM Input Threshold
SHDNM Input Bias
Current
Power-OK Voltage
Threshold
V
IN
= 2.5 to 5.5V
I
SHDNM
SHDNM = IN or GND
T
AMB
= +25ºC
T
AMB
= +85ºC
Power-OK Output (AS1356 only)
V
POK
V
OL
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POK Output Voltage Low
POK Output Leakage
Current
Thermal Protection
T
SHDNM
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
I
OUT
= 0, V
OUTFALLING
Hysteresis, I
OUT
= 0
I
SINK
= 1mA
0
≤
V
POK
≤
5.5V, V
OUT
in regulation
AS1353
AS1356
AS1353
AS1356
150
165
15
20
ΔT
SHDNM
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Revision 1.03
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100
0.2
0.8
dB
30
150
1
µs
µA
V
nA
0.01
0.04
2.0
0.03
0.2
95
1
0.4
100
92
97
0.4
1
V
µA
ºC
ºC
ºC
0.001 0.02 %/mA
al
180
µA
mV
%/V
µV
RMS
%
V
OUT
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%
mA
mA
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