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MAX781 - PDA/Hand-Held Computer Power Controller

Description

The MAX781 is a system-engineered power-supply controller for subnotebook computers, PDAs, or similar battery-powered equipment.

It provides high-performance, step-down (buck), pulse-width modulated (PWM) control for generating +3.3V and constant-current battery charging.

Features

  • o +3.3V Step-Down Controller o Dual PCMCIA 2.0 Compatible VPP Outputs (0V/3.3V/5V/12V) o Digitally Adjustable Switching Current Source for Battery Charging o 5 High-Side Switch Gate-Driver Outputs o SPI Serial Interface o 300kHz Switching Frequency o Oscillator SYNC Input o 2.5V ±1.5% Reference Output o 36-Pin SSOP Package MAX781 ________________________.

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Full PDF Text Transcription

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19-0205; Rev 0; 7/94 KI ION UAT BLE L A EV ILA AVA T PDA/Hand-Held Computer Power Controller _______________General Description The MAX781 is a system-engineered power-supply controller for subnotebook computers, PDAs, or similar battery-powered equipment. It provides high-performance, step-down (buck), pulse-width modulated (PWM) control for generating +3.3V and constant-current battery charging. Dual PCMCIA VPP outputs are powered by a regulated flyback winding. Five high-side gate drivers and a buffered analog multiplexer are also included. All functions are controlled by an SPI/Microwire™ compatible four-wire serial interface. The MAX781 generates +3.3V with high efficiency through synchronous rectification and PWM operation at heavy loads.
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