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