30V Li+ Linear Battery Charger with GSM Test Mode in 3mm x 2mm TDFN

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 1-Wire® serial interface. The charger status and valid input power are indicated by two open-drain outputs (active-low CHG and active-low POK).

The fast-charge current is defaulted to 400mA and programmable through the 1-Wire interface (active-low EN/SET). The MAX8922L also can be programmable to GSM test mode through the 1-Wire interface.

The MAX8922L is available in a tiny (3mm x 2mm x 0.8mm) 10-pin TDFN package.

Applications

* Digital Cameras * GSM/EDGE/UMTS/CDMA Cell Phones * PDAs * Portable Media Players and MP3 Players * Wireless Appliances

* 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

* 1-Wire Easy Programmable Fast-Charge and GSM Test Mode (Active-Low EN/SET)

* Resistor-Programmable Fast-Charge Current (SETI)

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

* Prequalification Charge

* Power-OK Monitor Output (Active-Low POK)

* Charging-Status Output (Active-Low CHG)

* Die Temperature Regulation for Optimized Charge Rate

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