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

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.

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)
功能框图
MAX1640、MAX1641:典型工作电路
产品应用
  • 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
关键参数
Part NumberProtected VIN
(V)
Charging VIN
(V)
Charge Rate Set byCharge TerminationCharge RegulationOper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX16402626ResistorExternal ControlSwitchmode-40 to +85
QSOP/16
$3.05 @1k
MAX1641
数据手册DataSheet
英文MAX1640-MAX1641.pdfRev 2; 03/2010
开发工具
技术资料
质量和环境数据
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX1640C/D停止供货DICE SALES,;NA引脚;DICE;参考数据资料
MAX1640EEE生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1640EEE+生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1640EEE+T生产中QSOP,;16引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1640EEE-T停止供货MAX1640EEE+TQSOP;16引脚-40°C至+85°C参考数据资料
MAX1640-MAX1641.pdf MAX1641
How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues MAX846A
New Developments in Battery Chargers MAX6023
MAX1640.pdf MAX1640
MAX1640-MAX1641.pdf MAX1641