General Description

The MAX1501 intelligent, constant-current, constant voltage (CCCV), temperature-regulated battery charger charges a single lithium-ion (Li+) cell or three-cell NiMH/NiCd batteries. The device integrates the current sense resistor, PMOS pass element, and thermal regulation circuitry, while eliminating the reverse blocking Schottky diode to create the simplest charging solution for hand-held equipment.

Features

♦ Stand-Alone 1-Cell Li+ Charging, MicroprocessorControlled 3-Cell NiMH/NiCd Charging

♦ No FET, Reverse-Blocking Diode, or CurrentSense Resistor Required

♦ 1.4A (max) Programmable Fast-Charge Current

♦ +95°C, +115°C, and +135°C Proprietary Programmable Die Temperature Regulation Control

♦ 4.5V to 13V Input Voltage Range with Input Overvoltage (OVLO) Protection Above 6.5V

♦ Programmable Top-Off Current Threshold: 10, 20, or 30 of the Fast-Charge Current

♦ Charge-Current Monitor for Fuel Gauging

♦ Programmable Safety Timer (3, 4.5, or 6 hours)

♦ Input Power Detection Output (ACOK) and Charge Enable Input (CHGEN)

♦ Automatic Recharge

♦ Digital Soft-Start Limits Inrush Current

♦ Charge Status Outputs for LEDs or µP Interface

Applications

    Cellular and Cordless Phones

    PDAs

    Digital Cameras and MP3 Players

    USB Appliances

    Charging Cradles and Docks

    Bluetooth™ Equipment