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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)

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关键参数

数据手册DataSheet

开发工具

• MAX1640EVKIT

技术资料

• How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues
• New Developments in Battery Chargers

质量和环境数据

• MAX1640.pdf

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