Datasheet
AS1374
D u a l 2 0 0 m A , L o w - N o i s e , H i g h - P S RR , L o w D r o p o u t R e g u l a t o r s
1 General Description
The AS1374 is a low-noise, low-dropout linear regulator with two
separated outputs. Designed to deliver 200mA continuous output
current at each output pin, the LDOs can achieve a low 120mV
dropout for 200mA load current and are designed and optimized to
work with low-cost, small-capacitance ceramic capacitors.
An integrated P-channel MOSFET pass transistor allows the devices
to maintain extremely low quiescent current (30µA).
The AS1374 uses an advanced architecture to achieve ultra-low
output voltage noise of 20µV
RMS
and a power-supply rejection-ratio
of better than 85dB (@ 1kHz).
Two active-High enable pins allows to switch on or off each output
independently from each other.
2 Key Features
Preset Output Voltages: 1.2V to 3.6V (in 50mV steps)
Power-Supply Rejection Ratio: 85dB @ 1kHz
Low Dropout: 120mV @ 200mA Load
Stable with 1µF Ceramic Capacitor for any Load
Guaranteed 200mA output
Pull-Down Option in Shutdown (factory set)
Extremely-Low Quiescent Current: 30µA
Excellent Load/Line Transient
The AS1374 requires only 1µF output capacitor for stability at any
load.
The device is available in a 6-bump WLP package.
Figure 1. AS1374 - Typical Application Circuit
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Overcurrent and Thermal Protection
6-bump WLP Package
3 Applications
The devices are ideal for mobile phones, wireless phones, PDAs,
handheld computers, mobile phone base stations, Bluetooth portable
radios and accessories, wireless LANs, digital cameras, personal
audio devices, and any other portable, battery-powered application.
Input
2V to 5.5V
2
3
Output1
1.2V to 3.6V
C2
1µF
C1
1µF
VDD
OUT 1
6
AS1374
1
Output2
1.2V to 3.6V
EN 1
OUT 2
C3
1µF
4
EN 2
5
GND
Revision 1.8
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Output Noise: 20µV
RMS
@ 100Hz to 100kHz
AMSCO [ AUSTRIAMICROSYSTEMS AG ]
