MAX887H - 100%占空比、低噪声、降压型、PWM DC-DC转换器

MAX887H是Maxim美信半导体公司的一款美信芯片产品，MAX887H是100%占空比、低噪声、降压型、PWM DC-DC转换器，本站介绍了MAX887H的封装应用图解、特点和优点、功能等，并给出了与MAX887H相关的Maxim元器件型号供参考。

MAX887H - 100%占空比、低噪声、降压型、PWM DC-DC转换器 - 美信芯片 - 内置功率MOSFET和检流电路，减少元件数并节省空间 - 美信半导体

产品概述

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.

The MAX887 features current-mode operation for superior load/line-transient response. Cycle-by-cycle current limiting protects the internal MOSFET and rectifier. A low-current (2.5µA typ) shutdown mode conserves battery life.

关键特性

以下关键特性由Maxim美信半导体提供：

95% Efficiency

600mA Output Current

Cycle-by-Cycle Current Limiting

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

Internal 0.6Ω (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

热门应用

蜂窝电话

计算机外设

分布式供电系统

个人通信装置

便携式仪表

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