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MAX888 - Wireless and Satellite Handset Power-Management ICs

General Description

The MAX886/MAX888 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 Li-Ion batteries.

Key Features

  • o 90% Efficient, 500mA Step-Down Converter o Two 100mA DAC-Controlled LDOs One 200mA DAC-Controlled LDO One 20mA DAC-Controlled LDO o 3 to 6-Cell NiCd or NiMH Operation 1 or 2-Cell Li-Ion Operation o +2.7V to +12V Input Voltage Range o 250µA Standby (PFM) Quiescent Current o 5µA Shutdown Current o I2C-Compatible Serial Interface o Selectable 375kHz, 535kHz, 670kHz, 925kHz (or Synchronizable) Switching Frequency o Power-On Reset and Start-Up Timer o Thermal Overload Protection o Pushbutton On/Off.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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MAX886/MAX888 19-1438; Rev 0; 3/99 EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL Wireless and Satellite Handset Power-Management ICs General Description The MAX886/MAX888 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 Li-Ion 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.