General Description
The MAX745 provides all functions necessary for charging lithium-ion battery packs. It provides a regulated charging current of up to 4A without getting hot, and a regulated voltage with only ±0.75% total error at the battery terminals. It uses low-cost, 1% resistors to set the output voltage, and a low-cost N-channel MOSFET as the power switch.

Features
♦ Charges 1 to 4 Lithium-Ion Battery Cells
♦ ±0.75% Voltage-Regulation Accuracy Using 1% Resistors
♦ Provides up to 4A without Excessive Heating
♦ 90% Efficient
♦ Uses Low-Cost Set Resistors and N-Channel Switch
♦ Up to 24V Input
♦ Up to 18V Maximum Battery Voltage
♦ 300kHz PWM Operation: Low-Noise, Small Components
♦ Stand-Alone Operation; No Microcontroller Needed

Applications
   Lithium-Ion Battery Packs
   Desktop Cradle Chargers
   Cellular Phones
   Notebook Computers
   Hand-Held Instruments