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Battery Management 
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MAX1640
Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier
High-Accuracy Current Sources Remain Cool While Fast Charging
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Key Features
Applications/Uses
Parametric specs for Battery Chargers
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.2 |
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Parameters
Parametric specs for Battery Chargers
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 3.2 |
Key Features
- 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)
Applications/Uses
- Backup Battery Charger
- Battery-Powered Applications
- Cell Phones
- Cordless Phones
- Handy Terminals
- Laptop, Notebook, and Palmtop Computers
- PCS Phones
- Portable Consumer Products
Description
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.
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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