AS1371
400mA, Low Input Voltage, Low Quiescent Current LDO
Datasheet
www.austriamicrosystems.com/LDOs/AS1371 Revision 1.6 1 - 17
1 General Description
The AS1371 low input voltage, positive voltage regulator is designed
to deliver up to 400mA while consuming typically only 15µA of
quiescent current. The device operates from input voltages of 1.2V
to 3.6V, and is available in fixed output voltages between 0.6V and
3.3V (programmable in 50mV steps).
Operation at the full 400mA load current is dependent upon the
maximum power dissipation available from package and
environment.
The low input voltage and ultra-low dropout voltage (20mV @
100mA load and 80mV @ 400mA load) supports single primary cell
operation in small applications, when operated with minimum input-
to-output voltage differentials. In addition, the regulator provides a
power management life extension by operating from pre-existing
1.8V and 2.5V outputs to provide low output voltages for new
generation portable processor cores.
The device features stable output voltage with ceramic capacitors
down to a value of 1µF, strict output voltage regulation tolerances
(±1%), and good line- and load-regulation.
The AS1371 is available in a 6-pin 2x2 TDFN package and is
qualified for -40°C to +85°C operation.
Figure 1. AS1371 - Typical Application Diagram
2 Key Features
Ultra-Low Dropout Voltage: 20mV @ 100mA load
Operating Input Voltage Range: 1.2V to 3.6V
Output Voltages: 0.6V to 3.3V in 50mV steps
Max. Output Current: 400mA
Output Voltage Accuracy: ±1%
Low Shutdown Current: 10nA
Low Quiescent Current: 50µA @ max load
Integrated Overtemperature/Overcurrent Protection
Under-Voltage Lockout Feature
Chip Enable Input
Power-OK and Low Battery Detection
Sense Input Option
Minimal External Components Required
Operating Temperature Range: -40°C to +85°C
6-pin 2x2 TDFN Package
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.
Input
1.2V to 3.6V
C
IN
1µF
ON
OFF
100k
C
OUT
1µF
Output
0.6V to 3.3V
IN
EN
GND
SENSE
OUT
AS1371
POK
