AT73C202-EK1【PDF 1/21 页】KIT EVAL FOR AT73C202

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Features

300mA/1.8V/2.5V Switching Regulator for Baseband Supply

2.8V/80mA LDO for Baseband Pad Supply

Two 130mA/2.8V Low-noise, High PSRR RF LDO Voltage Regulators

130mA/2.7V/2.8V Baseband Low-noise, High PSRR Analog LDO Regulator

Ultra Low-power RTC LDO Voltage Regulator

Backup Battery Charger

Li-Ion or Li-polymer Battery Charger Controller

Buzzer and Vibrator Drivers

Charging LED Driver

Power Management Start-up Controller and Reset Generation

SIM Level Shifters and SIM 10mA/1.8V/2.8V LDO Voltage Regulator

Ultra-low Sleep Mode Current Consumption (17 μA typ)

Over and Under Voltage Protections

Over Temperature Protection

Low-power Mode and Sleep Mode

Straight and Easy Interfacing to any Baseband Controller

Small 5x5mm, Forty-nine Ball FBGA Package

Power

Management for

Mobiles (PM)

Description

The AT73C202 is a low-cost, ultra low-power, power and battery management IC

designed to interface directly with state-of-the-art cellular phones, for example with

2.5G GSM phones. It includes all required power supplies tailored to be fully compati-

ble with the sub-systems of recent mobile phone chipsets, including the RF, analog

and digital (DSP, microcontroller, memories) sections.

The AT73C202 integrates a step-down DC-DC converter that supplies 300 mA with

internal switches and two levels of voltage programming for the baseband core (1.8V

and 2.5V). A low-power mode is available in order to minimize standby current con-

sumption during the “quiet” transmission periods.

In addition, the AT73C202 includes a lowcost battery charger, using a simple external

PNP transistor for Li-Ion or Li-Polymer batteries. Battery operating conditions are

maintained within safe limits under hardware control during the start-up procedure

AT73C202

Power and

Battery

Management

Unit for Cellular

Phone

Preliminary

(when the phone is turned on or a charger is plugged in). The battery pre-charge is

also integrated and self-operated by the AT73C202. On completion the fast charge

and end-of-charge procedure is transferred to the baseband software.

The AT73C202 integrates 7 low-dropout linear regulators specifically designed to sup-

ply RF (x2), analog, memories, etc. It also includes a back-up battery charger and an

ultra low-power regulator dedicated to the baseband real-time clock (RTC) supply dur-

ing sleep mode.

The hardwired start-up mechanism (power management controller state machine)

ensures safe telephone operation during the wake-up and shut-down procedures, and

during the multiple real-life operating conditions of a mobile phone (such charger plug-

in, plug-out, battery plug-in, plug-out, low or dead battery, etc.).

The AT73C202 is packaged into a 49 ball (7x7 matrix), 0.65mm pitch, 5mm x 5mm

outline FBGA package.

2740B–PMGMT–05/03

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