AS1371
400mA, Low Input Voltage, Low Quiescent Current LDO
www.austriamicrosystems.com Revision 1.04 1 - 14
Datasheet
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 ge neration 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.
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 fo r 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.
Figure 1. AS1371 - Typical Application Diagram
Input
1.2V to 3.6V
C
IN
1µF
ON
OFF
100kΩ
C
OUT
1µF
Output
0.6V to 3.3V
IN
EN
GND
SENSE
OUT
AS1371
POK
