General Description
The MAX1909/MAX8725 highly integrated control ICs simplify construction of accurate and efficient multichemistry battery chargers. The MAX1909/MAX8725 use analog inputs to control charge current and voltage, and can be programmed by a host microcontroller (µC) or hardwired. High efficiency is achieved through use of buck topology with synchronous rectification.

FEATUREs
♦ ±0.5% Accurate Charge Voltage (0°C to +85°C)
♦ ±3% Accurate Input Current Limiting
♦ ±5% Accurate Charge Current
♦ Programmable Charge Current >4A
♦ Automatic System Power-Source Selection
♦ Analog Inputs Control Charge Current and Charge Voltage
♦ Monitor Outputs for Current Drawn from AC Input Source AC Adapter Presence
♦ Up to 17.65V (max) Battery Voltage
♦ Maximum 28V Input Voltage
♦ Greater than 95% Efficiency
♦ Charge Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.

APPLICATIONs
  Notebook and Subnotebook Computers
  Hand-Held Data Terminals