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Datasheet
AS1376
1 A , L o w I n p u t Vo l t a g e , L o w Q u ie sc e n t C u r r en t L D O
1 General Description
The AS1376 is a Dual Supply Rail Linear Regulator designed to
deliver 1A of load current while consuming only 67µA (typ) of ground
current. In the typical post regulation application V
BIAS
is directly
connected to the main input supply, (range 2.5V...5.5V) and V
IN
is
supplied by the output voltage of a host DC-DC Converter (range
0.7V...4.5V).
The device offers excellent dropout (120mV @ 1A) and transient
performance.
In shutdown (Enable pin pulled low), the device turns off and reduces
quiescent current consumption to 10nA (typ) at both V
BIAS
and V
IN
terminals.
In shutdown, a 100 (typ) discharge path is connected between
output and ground to provide rapid discharge of the overall load
capacitance connected to the AS1376 output terminal. Auto-
discharge minimizes the possibility that V
OUT
> V
IN
during
shutdown. When V
OUT
> V
IN
, reverse current flows through the
inherent body diode of the N-channel series pass transistor.
The AS1376 also features internal protection against over-
temperature, over-current and under-voltage conditions.
2 Key Features
Ultra-Low Dropout Voltage: <120mV @ 1A load
Input voltage: 0.7V to 3.6V
Bias Supply Voltage: 2.5V to 5.5V
Maximum Output
Current: 1A
Output Voltage Accuracy: ±2%
Low Shutdown Current: 20nA
Wide band V
BIAS
PSRR 45dB (typ) 10mA load
Integrated Overtemperature /
Chip Enable Input
The device is available in an 8-pin 2x2 TDFN package and is
qualified for operation over the -40ºC to +85ºC temperature range.
The device is available in fixed output voltages from 0.5V up to 2.2V
in 100mV steps (50mV from 0.5V to 1.1V). See
Ordering Information
on page 18.
Figure 1. AS1376 - Typical Application Diagram
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Minimal external components required
Operating Temperature Range: -40°C to +85°C
8-pin 2x2mm TDFN Package
Overcurrent Protection
2 weeks availability for non-standard devices between 0.5V and
1.1V in 50mV steps and between 1.1V and 2.2V in 100mV
steps.
3 Applications
The devices are ideal for powering cordless and mobile phones,
MP3 players, CD and DVD players, PDAs, hand-held computers,
digital cameras and any other hand-held and/or battery-powered
device.
Revision 1.4
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Output voltages: 0.5V to 2.2V
AS1376
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
VIN 1
VIN
2
8 VOUT
7 FB
AS1376
VBIAS 3
GND 4
9
6 NC
5 EN
4.1 Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1, 2
3
4
5
6
7
8
9
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Pin Name
VIN
VBIAS
GND
EN
NC
FB
VOUT
Revision 1.4
Description
Unregulated Input Voltage.
0.7V to 3.6V. Bypass this pin with a capacitor to GND.
Bias Input Voltage.
2.5V to 5.5V. Bypass this pin with a capacitor to GND.
Ground.
Enable.
Pull this pin to low to disable the device.
Leave this pin unconnected.
Feedback Pin.
Connect to VOUT to select the factory-preset output voltage. For the adjustable version
connect to an external resistor divider to set output voltage.
Regulated Output Voltage.
0.5V to 3.3V. Bypass this pin with a capacitor to GND.
Exposed Pad.
This pad is not connected internally. Ensure a good connection to the PCB to achieve
optimal thermal performance.
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AS1376
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in
Table 2
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 2. Absolute Maximum Ratings
Parameter
Electrical Parameters
VIN to GND
VBIAS,
EN
to GND
VOUT to GND
Output Short-Circuit Duration
Input Current (latch-up immunity)
Electrostatic Discharge
Electrostatic Discharge HBM
2
kV
Temperature Ranges and Storage Conditions
-100
-0.3
-0.3
-0.3
5
+6.5
V
IN
+ 0.3
Indefinite
100
mA
V
V
V
JEDEC 78
Min
Max
Units
Notes
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Thermal Resistance
JA
97
ºC/W
Junction Temperature
+125
+150
85
ºC
ºC
%
Storage Temperature Range
Humidity non-condensing
-55
5
Package Body Temperature
+260
ºC
Humidity non-condensing
5
85
%
Revision 1.4
Norm: MIL 883 E method 3015
Junction-to-ambient thermal resistance is very
dependent on application and board-layout. In
situations where high maximum power
dissipation exists, special attention must be paid
to thermal dissipation during board design.
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/
JEDEC J-STD-020 “Moisture/Reflow Sensitivity
Classification for Non-Hermetic Solid State
Surface Mount Devices”.
The lead finish for Pb-free leaded packages is
matte tin (100% Sn).
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AS1376
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
V
IN
= V
OUT
+ 0.2V, V
BIAS
= V
OUT
+ 1.5V (or 2.5V whichever is larger), EN = V
BIAS
, C
IN
= C
OUT
= 1µF, C
BIAS
= 4.7µF, T
AMB
= -40ºC to
+85ºC. Typical values are at T
AMB
= +25ºC (unless otherwise specified).
Table 3. Electrical Characteristics
Symbol
T
AMB
V
IN
V
BIAS
V
OUT
V
OUT(NOM)
- V
OUT
V
FB
Parameter
Operating Temperature Range
Input Voltage
Bias Supply Voltage
Output Voltage
Output Voltage Accuracy
1
Conditions
Min
-40
0.7
2.5
Typ
Max
+85
3.6
5.5
3.3
Units
Available in 100mV steps
(see Ordering Information on page 18)
I
OUT
= 100µA
I
OUT
= 0A to 1A
I
OUT
= 100µA
I
OUT
= 0A to 1A
I
OUT
= 100µA
I
OUT
= 100µA
0.5
-1.5
-2
492
490
V
OUT
/
V
IN
V
OUT
/
V
BIAS
V
LDR
I
OUT
I
LIM
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500
40
510
Line Regulation V
IN
Line Regulation V
BIAS
Load Regulation
Output Current
Current Limit
2
Feedback Voltage
I
OUT
= 1mA to 1A
1
V
OUT
forced to 90% of nominal V
OUT
V
BIAS
= V
OUT
+ 1.5V, I
OUT
= 1A
V
BIAS
= V
OUT
+ 1.8V, I
OUT
= 1A
V
BIAS
= V
OUT
+ 2.1V, I
OUT
= 1A
V
BIAS
= 5.5V, I
OUT
= 1A
I
OUT
= 500mA
I
OUT
= 1A
V
DROP
-V
IN
Output Voltage Dropout V
IN
V
DROP
-
V
BIAS
En
Output Voltage Dropout V
BIAS
Output Voltage Noise
f = 10Hz to 100kHz, I
OUT
= 1mA
f = 100Hz, I
OUT
= 10mA
f = 1kHz, I
OUT
= 10mA
f = 10kHz, I
OUT
= 10mA
PSRR - V
IN
Power-Supply Rejection Ratio
Sine modulated V
IN
f = 100kHz, I
OUT
= 10mA
f = 100Hz, I
OUT
= 10mA
f = 1kHz, I
OUT
= 10mA
f = 10kHz, I
OUT
= 10mA
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PSRR -
V
BIAS
Power-Supply Rejection Ratio
Sine modulated V
BIAS
f = 100kHz, I
OUT
= 10mA
I
OUT
= 0mA
I
Q_VBIAS
I
Q_VIN
I
SHDN
-
V
BIAS
Quiescent Current into V
BIAS
Quiescent Current into V
IN
Shutdown Current into V
BIAS
V
EN
= 0V
Shutdown Current into V
IN
I
SHDN
-
V
IN
www.austriamicrosystems.com/LODs/AS1376
Revision 1.4
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500
508
mV
µV/V
µV/V
%/mA
A
A
mV
mV
135
0.0002
1.35
120
115
110
105
1.1
65
78
0.85
V
µV
RMS
61
54
60
dB
69
51
45
45
60
6.5
0.02
µA
0.02
120
8
µA
dB
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