AS1367
150mA, Adaptive Low Drop-Out Linear Regulator
www.austriamicrosystems.com Revision 1.02 1 - 14
Datasheet
1 General Description
The AS1367 is a precise, low noise, high speed, low
dropout regulator with adaptive operation. Features
included are high ripple rejection and low dropout volt
-
age, a reference voltage source, an error amplifier and a
current limiter.
The AS1367 provides high speed operation, low power
consumption and high efficiency by automatically
switching between a light load and a heavy load mode
depending upon the output current level .
The EN function enables the output to be turned off,
while the electric charge at the output capacitor is
discharged via the internal auto-discharge resistance,
and as a result the V
OUT pin quickly returns to the GND
level.
Furthermore a Bypass Pin is included to reduce noise.
The device features integrate short-circuit and over
current protection. Under-Voltage lockout prevents
erratic operation when the input voltage is slowly
decaying. Thermal Protection shuts down the device
when die temperature reaches 160°C. This is a useful
protection when the device is under sustained short
circuit conditions.
The device is available in a 8-pin TDFN 2x 2 package.
2 Key Features
! Low Dropout V oltage: 110mV @ 150mA load
! Operating Input Voltage Range: 2.0V to 5.5V
! Output Voltage Range: 1.2V to 5.0V (50mV steps)
! Max. Output Current: 150mA
! Low Shutdown Current: 100nA
! High PSRR: 60dB @ 10kHz
! Integrated Overtemperature/Overcurrent Protection
! Under-Voltage Lockout Feature
! Chip Enable Input
! Power-OK
! Low Quiescent Current: 10µA
! Low Output Noise: 15µV @ 100kHz Bandwidth
! Operating Temperature Range: -40°C to +85°C
! 8-pin TDFN 2x2 Package
3 Applications
The AS1367 is ideal for cellular phones, cordless
phones, wireless communication equipment, portable
games, cameras, video recorders, portable audio-video
equipment and personal digital assistants.
Figure 1. AS1367 - Typical Application Diagram
Input
2V to 5.5V
C
IN
1µF
R
PU
100kΩ
C
OUT
3.3µF
Output
1.2V to 5.0V
IN
IN
BYP
OUT
AS1367
POK
GND
SET
ON /
OFF
EN
C
BYP
10nF