AT73C239-EK【PDF 1/4 页】KIT EVAL FOR AT73C239

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Sheet目录1196

[1页]2页 3页 4页

Features

Main Supply 3.0V to 3.6V

Independent 2.5V to 3.6V Auxiliary Supply for Backup Section

Internal State Machine for Startup

25 mA/1.8V-2.75V Linear Low Drop Out Regulator with High PSRR and Low Noise

(LDO1)

30 mA/1.5V-1.8V Linear Low Drop Out Regulator with High PSRR and Low Noise

(LDO2)

60 mA/1.23V-1.5V-1.8V Linear Low Drop Out Regulator with High PSRR (LDO3)

2 mA/1.2V-1.5V-1.8V Linear Low Drop Out Regulator with Very Low Quiescent Current

(LDO4)

HPBG Economic High Performance Voltage Reference for LDO Supply to RF Sections

LPBG Low Power Voltage Reference to LDO4 During Backup Battery Operation

Internal Oscillator Generates Internal Master Clock

Internal Reset Generator for Main Supply

Additional External Reset Input

Two Wire Interface (TWI) for Independent Activation and Output Voltage Programming

for Each LDO

Available in 3 x 3 x 0.9 mm 16-pin QFN Package

Applications: GPS Modules, WLAN Devices, Wireless Modules

Power

Management for

Mobiles (PM)

AT73C239

4-channel Power

1. Description

The AT73C239 is a 4-channel Power Supply Power Management Unit (PMU) avail-

able in a QFN 3 x 3 mm package. It is a fully integrated, low cost, combined Power

Management device for wireless modules, GPS and WLAN devices. It integrates four

Linear Low Drop Out (LDO) Regulators, three of which provide high-accuracy RF per-

formance and one (LDO4) with very low quiescent current that is supplied by an

external backup battery. A Low Power Bandgap (LPBG) requiring no external capaci-

tor for decoupling, is used as reference voltage for LDO4 and starts when VBAT is

Management for

Wireless

Modules

Summary

present. LDO4 regulates output voltage with extremely low quiescent current, maxi-

mizing the lifetime of the backup battery. An Internal State Machine manages the

startup of the other LDOs in the order of LDO3 then LDO1 then LDO2. An economic

High Power Bandgap (HPBG) provides highly accurate, low noise voltage reference

to LDOs 1, 2, 3. HPBG operates in switching mode thereby decreasing its current con-

sumption and becomes inactive when not directly supplied by VIN current. When the

RF LDOs are in idle mode, quiescent current is decreased to a minimum.

The AT73C239 features a Two-wire Interface (TWI) to increase the efficiency of the

system by disabling LDOs when not needed.

6201AS–PMAAC–24-Oct-05

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