MAX888ECJ中文資料美信數(shù)據(jù)手冊PDF規(guī)格書

General Description

The MAX886/MAX888/MAX1863 power-management ICs are complete power systems for wireless and satellite handsets. The devices operate from 3- to 6-cell NiCd/NiMH batteries or from 1- or 2-cell lithium-ion (Li+) batteries. They incorporate a high-efficiency, step-down DC-DC converter, a regulated 5V charge pump, and four linear regulators. The regulators 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 I2C?-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 startup timer.

Features

? 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+ Operation

? +2.7V to +12V Input Voltage Range

? 250μA Standby (PFM) Quiescent Current

? 5μA Shutdown Current

? I2C-Compatible Serial Interface

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

?? (or Synchronizable) Switching Frequency

? Power-On Reset and Startup Timer

? Thermal Overload Protection

? Pushbutton On/Off Control

? Space-Saving 32-Pin TQFP Package (9mm x 9mm)

Applications

?? Satellite Phones

?? Private Mobile Radio (PMR)

?? Wireless Handsets

?? GSM Cellular/PCS Telephones