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. Applications * Backup Battery Charger * Battery-Powered Applications * Cell Phones * Cordless Phones * Handy Terminals * Laptop, Notebook, and Palmtop Computers * PCS Phones * Portable Consumer Products * 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) https://elecena.pl/product/22317443/adjustable-output-switch-mode-current-sources-with-synchronous-rectifier 2022-12-27 https://elecena.pl/product/22317443/adjustable-output-switch-mode-current-sources-with-synchronous-rectifier 2024-10-02 https://elecena.pl/product/22317443/adjustable-output-switch-mode-current-sources-with-synchronous-rectifier 2024-11-09 https://elecena.pl/product/22317443/adjustable-output-switch-mode-current-sources-with-synchronous-rectifier 2025-01-19