Features and Benefits
- 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)
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.
- Backup Battery Charger
- Battery-Powered Applications
- Cell Phones
- Cordless Phones
- Handy Terminals
- Laptop, Notebook, and Palmtop Computers
- PCS Phones
- Portable Consumer Products
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
MAX1640 Reliability Data1/12/2023154K
New Developments in Battery Chargers3/15/2000
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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