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MAX1640

Maxim
Part Number MAX1640
Manufacturer Maxim
Description Adjustable-Output / Switch-Mode Current Sources
Published May 6, 2005
Detailed Description 19-1245; Rev 0; 7/97 KIT ATION EVALU LE B A IL A AV Adjustable-Output, Switch-Mode Current Sources with Synchronous Re...
Datasheet PDF File MAX1640 PDF File

MAX1640
MAX1640

Overview
19-1245; Rev 0; 7/97 KIT ATION EVALU LE B A IL A AV Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier ____________________________Features o 95% Efficiency o +5.
5V to +26V Input Supply Range o 2V to 24V Adjustable-Output Voltage Range o 100% Maximum Duty Cycle (Low Dropout) o Up to 500kHz PWM Operation o Optional Synchronous Rectifier o 16-Pin QSOP Package o Current-Sense Accuracy: 2% (MAX1641) 5.
3% (MAX1640) _______________General 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 highside 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.
MAX1640/MAX1641 ______________Ordering Information PART MAX1640C/D MAX1640EEE MAX1641C/D MAX1641EEE TEMP.
RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PIN-PACKAGE Dice* 16 QSOP Dice* 16 QSOP ________________________Applications Battery-Powered Equipment Laptop, Notebook, and Palmtop Computers Handy Terminals Portable Consumer Products Cordless Phones Cellular Phones PCS Phones Backup Battery Charger *Dice are specified at TA = +25°C, DC parameters only.
__________Typical Operati...


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