Datasheet
AS1374
200mA, Ultra-Low-Noise, High-PSRR, Dual Low
Dropout Regulators
1 General Description
The AS1374 is a ultra-low-noise, low-dropout linear reg-
ulator with two seperated outputs. Specifically designed
to deliver 200mA continuous output current at each out-
put 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 capaci-
tors.
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.
The AS1374 requires only 1µF output capacitor for sta-
bility at any load.
The device is available in a 6-bump WLP package.
2 Key Features
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Preset Output Voltages: 1.2 to 3.6V (in 50mV steps)
Output Noise: 20µV
RMS
@ 100Hz to 100kHz
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
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 accesso-
ries, wireless LANs, digital cameras, personal audio
devices, and any other portable, battery-powered appli-
cation.
Figure 1. AS1374 - Typical Application Circuit
Input
2V to 5.5V
C
IN
1µF
2
VDD
3
OUT 1
Output1
1.2V to 3.6V
C
OUT1
1µF
6
EN 1
AS1374
1
OUT 2
C
OUT2
1µF
Output2
1.2V to 3.6V
4
EN 2
5
GND
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