AS1374

200mA, Ultra-Low-Noise, High-PSRR, Dual Low

Dropout Regulators

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Revision 1.03

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Datasheet

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

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.

Figure 1. AS1374 - Typical Application Circuit

2 Key Features

!

Preset Output Voltages: 1.2 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

!

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.

AS1374

5

GND

4

EN 2

2

VDD

3

OUT 1

6

EN 1

1µF

Input

2V to 5.5V

Output1

1.2V to 3.6V

1

OUT 2

1µF

1µF

Output2

1.2V to 3.6V