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MAX1640

MAX1640

可调输出、开关模式电流源，内置同步整流

高精度电流源，快速充电时仍可保持低温状态

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概述

说明

The MAX1640/MAX1641 CMOS, adjustable-output, switch-mode current sources operate from a +5.5V to +26V input, and are ideal for microprocessor-controlled battery chargers. Charging current, maximum output voltage, and pulse-trickle charge are programmed with external resistors. Programming the off-time modifies the switching frequency, suppressing undesirable harmonics in noise-sensitive circuits. The MAX1640's high-side current sensing allows the load to connect directly to ground, eliminating ground-potential errors. The MAX1641 incorporates a low-side current sense.

The MAX1640/MAX1641 step-down pulse-width-modulation (PWM) controllers use an external P-channel MOSFET switch and an optional, external N-channel MOSFET synchronous rectifier for increased efficiency. An internal low-dropout linear regulator provides power for the internal reference and circuitry as well as the gate drive for the N-channel synchronous rectifier.

The MAX1640/MAX1641 are available in space-saving, 16-pin narrow QSOP packages.
MAX1640、MAX1641：典型工作电路 MAX1640、MAX1641：典型工作电路 放大+

关键特性

  • 95% Efficiency
  • +5.5V to +26V Input Supply Range
  • 2V to 24V Adjustable-Output Voltage Range
  • 100% Maximum Duty Cycle (Low Dropout)
  • Up to 500kHz PWM Operation
  • Optional Synchronous Rectifier
  • 16-Pin QSOP Package
  • Current-Sense Accuracy:
    • 2% (MAX1641)
    • 5.3% (MAX1640)

应用

  • 备用电池充电器
  • 电池供电应用
  • 蜂窝电话
  • 无绳电话
  • 手持终端
  • 笔记本电脑、笔记本电脑与掌上电脑
  • PCS电话
  • 便携式消费类产品

参数规格


Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

设计资源


MAX1640EVKIT: MAX1640、MAX1641评估板

技术资料

设计指南 680 How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues
应用笔记 676 New Developments in Battery Chargers

质量与环境

产品可靠性报告: MAX1640.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注： 通过技术手段对故障率进行汇总，并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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技术文档

参考设计

类型 编号 标题
评估板1752MAX1640EVKIT MAX1640、MAX1641评估板
评估板1752MAX1640_EVKIT MAX1640、MAX1641评估板