GENERAL DESCRIPTION
FEATURES
o Input Current Limiting o ±0.5% Output Voltage Accuracy Using Internal Reference (0°C to +85°C) o Programmable Battery Charge Current >4A o Analog Inputs Control Charge Current and Charge Voltage o Monitor Outputs for: Current Drawn from AC Input Source Charging Current AC Adapter Present o Up to 18.2V (max) Battery Voltage o 8V to 28V Input Voltage o >95% Efficiency o 99.99% (max) Duty Cycle for Low-Dropout Operation o Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. MAX1772 High efficiency is achieved by a buck topology with synchronous rectification. Maximum current drawn from the AC adapter is programmable to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. The MAX1772 provides outputs that can be used to monitor the current drawn from the AC adapter, battery-charging current, and the presence of an AC adapter. The MAX1772 can charge two to four lithium-ion (Li+) series cells, easily providing 4A.
Maxim Integrated
