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100%占空比、低噪声、降压型、PWM DC-DC转换器

内置功率MOSFET和检流电路,减少元件数并节省空间

产品详情

主要特征

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 10
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 440
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.04
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 3.5
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 10
IOUT1 (A) (max) 0.6
Switch Type Internal
Output Adjust. Method Resistor
# DC-DC Outputs 1
Switching Frequency (kHz) 440
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
3.04

主要特征

  • 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

应用/用途

  • 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

描述

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.

简化框图

MAX887、MAX887H:典型工作电路 MAX887、MAX887H:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心