MAX887HCSLASHD中文資料美信數(shù)據(jù)手冊PDF規(guī)格書

General Description

The MAX887 high-efficiency, step-down DC-DC converter provides an adjustable output from 1.25V to 10.5V. It accepts inputs from 3.5V to 11V and delivers 600mA. Operation to 100% duty cycle minimizes dropout voltage (300mV typ at 500mA). Synchronous rectification reduces output rectifier losses, resulting in efficiency as high as 95%.

Fixed-frequency pulse-width modulation (PWM) reduces noise in sensitive communications applications. Using a high-frequency internal oscillator allows tiny surface-mount components to reduce PC board area, and eliminates audio-frequency interference. A SYNC input allows synchronization to an external clock to avoid interference with sensitive RF and data acquisition circuits.

Features

? 95% Efficiency

? 600mA Output Current

? Cycle-by-Cycle Current Limiting

? Low-Dropout, 100% Duty-Cycle Operation, 300mV at 500mA

? Internal 0.6? (typ) MOSFET

? Internal Synchronous Rectifier

? High-Frequency Current-Mode PWM

? External SYNC or Internal 300kHz Oscillator

? Guaranteed 260kHz to 340kHz Internal Oscillator Frequency Limits

? 2.5μA Shutdown Mode

Applications

? Portable Instruments

? Cellular Phones and Radios

? Personal Communicators

? Distributed Power Systems

? Computer Peripherals

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