MAX888ECJ Maxim, MAX888ECJ Datasheet

MAX888ECJ

Manufacturer Part Number

MAX888ECJ

Description

Wireless and Satellite Handset Power-Management ICs

Manufacturer

Maxim

Datasheet

1.MAX888ECJ.pdf (20 pages)

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The MAX886/MAX888 power-management ICs are com-

plete power systems for wireless and satellite handsets.

The devices operate from 3 to 6-cell NiCd/NiMH batter-

ies or from 1 or 2-cell Li-Ion batteries. They incorporate a

high-efficiency, step-down DC-DC converter, a regulated

5V charge pump, and four linear regulators. The regula-

tors supply power to the SIM, LCD, BB, DSP, and RF

sections of a cellular telephone handset. The step-down

converter and linear regulator outputs are adjustable by

internal 4-bit DACs, programmable through the I

compatible serial interface. A pushbutton on/off scheme

activates a 5µA low-power shutdown mode. The devices

also feature a low-battery detector output and an internal

start-up timer.

The MAX886/MAX888 differ in output voltage range and

power-on reset voltage. The MAX886 has a higher preset

voltage range and is intended for 2-cell Li-Ion or 5/6-cell

NiCd/NiMH batteries. The MAX888 has a lower preset

voltage range and is intended for 1-cell Li-Ion or 3/4-cell

NiCd/NiMH batteries. Both devices are available in a

space-saving, 32-pin TQFP package.

Satellite Phones

Wireless Handsets

19-1438; Rev 0; 3/99

Pin Configuration appears at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

C is a trademark of Philips Corp.

SERIAL INTERFACE

ON/OFF CONTROL

C-COMPATIBLE

LOW-BATTERY

________________________________________________________________ Maxim Integrated Products

2.7V TO 12V

(OPTIONAL)

DETECT

General Description

GSM Cellular/PCS Telephones

Private Mobile Radio (PMR)

Applications

BATT

LBI

LBO

SCL

SDA

OFF

SYNC

C+

C-

Wireless and Satellite Handset

MAX886

MAX888

GND

C™-

ONSTAT

RESET

PGND

OUT4

OUT5

OUT0

OUT1

OUT2

OUT3

Power-Management ICs

Future product—contact factory for availability.

MAX886ECJ*

MAX888ECJ

90% Efficient, 500mA Step-Down Converter

Two 100mA DAC-Controlled LDOs

One 200mA DAC-Controlled LDO

One 20mA DAC-Controlled LDO

3 to 6-Cell NiCd or NiMH Operation

1 or 2-Cell Li-Ion Operation

+2.7V to +12V Input Voltage Range

250µA Standby (PFM) Quiescent Current

5µA Shutdown Current

Selectable 375kHz, 535kHz, 670kHz, 925kHz

(or Synchronizable) Switching Frequency

Power-On Reset and Start-Up Timer

Thermal Overload Protection

Pushbutton On/Off Control

Space-Saving 32-Pin TQFP Package (7mm x 7mm)

C-Compatible Serial Interface

PART

Tx SECTION POWER (UP TO 100mA)

DSP POWER (UP TO 200mA)

POWER-ON RESET

3V/5V SIM CARD POWER (UP TO 20mA)

LCD/VCO/TXCO POWER (UP TO 100mA)

Rx SECTION POWER (UP TO 100mA)

ON STATUS

Typical Operating Circuit

-40°C to +85°C

TEMP. RANGE

Ordering Information

MAIN POWER (UP TO 500mA)

32 TQFP

PIN-PACKAGE

Features

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