General Description

The MAX8922L linear battery charger safely charges a single-cell lithium-ion (Li+) battery. Charging rate is optimized to accommodate the thermal characteristics of a given application. There is no need to reduce the maximum charge current at the worst-case charger power dissipation. Charging is optimized for a single Li+ cell using a control algorithm that includes low-battery precharging, voltage and current-limited fast charging, and top-off charging, while continuously monitoring for input overvoltage and device die-temperature conditions. The fast-charge current and top-off current thresholds are programmable by a simple single-pin serial interface. The charger status and valid input power are indicated by two open-drain outputs (CHG and POK).

Features

♦ Overvoltage-Protected 30VDC Rated Input (IN)

♦ Input Overvoltage-Protected Safe 4.94V LDO Output

♦ 2.3A GSM RF Test Mode

♦ No External FET, Blocking Diode, or Sense Resistor Required

♦ Single-Pin Easy Programmable Fast-Charge and GSM Test Mode (EN/SET)

♦ Resistor-Programmable Fast-Charge Current (SETI)

♦ Resistor-Programmable Top-Off Current Threshold (MIN)

♦ Prequalification Charge

♦ Power-OK Monitor Output (POK)

♦ Charging-Status Output (CHG)

♦ Die Temperature Regulation for Optimized Charge Rate

♦ Tiny (3mm x 2mm x 0.8mm) 10-Pin TDFN Package

Applications

GSM/EDGE/UMTS/CDMA Cell Phones

Digital Cameras

PDAs

Portable Media Players and MP3 Players

Wireless Appliances