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General Description

The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4- series lithium-ion cells at up to 4A or more. It provides a regulated charging current and voltage with less than ±0.75 total voltage error at the battery terminals. An external P-channel MOSFET operates in a step-down DC-DC configuration to efficiently charge batteries in low-cost designs.

Features

? Low-Cost and Simple Circuit

? Charges 2-, 3-, or 4-Series Lithium-Ion Cells

? AC Adapter Input-Current-Limit Loop

? Also Charges Ni-Based Batteries

? Analog Output Monitors Charge Current

? ±0.75 Battery-Regulation Voltage

? 5μA Shutdown Battery Current

? Input Voltage Up to 28V

? 200mV Dropout Voltage/100 Duty Cycle

? Adjustable Charging Current

? 300kHz PWM Oscillator Reduces Noise

? Space-Saving 16-Pin QSOP

? MAX1873 Evaluation Kit Available to Speed Designs

Applications

Notebook Computers

Portable Internet Tablets

2-, 3-, or 4-cell Li+ Battery Pack Chargers

6-, 9-, or 10-cell Ni Battery Pack Chargers

Hand-Held Instruments

Portable Desktop Assistants (PDAs)

Desktop Cradle Chargers