General Description

The MAX1870A step-up/step-down multichemistry battery charger charges with battery voltages above and below the adapter voltage. This highly integrated charger requires a minimum number of external components. The MAX1870A uses a proprietary step-up/step down control scheme that provides efficient charging. Analog inputs control charge current and voltage, and can be programmed by the host or hardwired.

Features

♦ Patented Step-Up/Step-Down Control Scheme*

♦ ±0.5% Charge-Voltage Accuracy

♦ ±9% Charge-Current Accuracy

♦ ±8% Input Current-Limit Accuracy

♦ Programmable Maximum Battery Charge Current

♦ Analog Inputs Control Charge Current, Charge Voltage, and Input Current Limit

♦ Analog Output Indicates Adapter Current

♦ Input Voltage from 8V to 28V

♦ Battery Voltage from 0 to 17.6V

♦ Charges Li+ or NiCd/NiMH Batteries

♦ Tiny 32-Pin Thin QFN (5mm x 5mm) Package