19-4340; Rev 1; 9/09
KIT ATION EVALU E L B A AVAIL
28V Linear Li+ Battery Chargers with Battery Detection and Overvolt...
19-4340; Rev 1; 9/09
KIT ATION EVALU E L B A AVAIL
28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output
General Description
The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W are intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated linear chargers designed for charging a single-cell lithium-ion (Li+) battery. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminate the external reverse-blocking
Schottky diode to create the simplest and smallest charging solutions for handheld equipment. The ICs control the charging sequence from the prequalification state through constant current fast-charge, top-off charge, and full-charge indication. Proprietary thermal-regulation circuitry limits the die temperature during fast-charging or when the ICs are exposed to high ambient temperatures, allowing maximum charging current without damaging the ICs. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W achieve high flexibility by providing adjustable fastcharge currents (SETI) and an adjustable top-off current threshold (MIN) through external resistors. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W feature a booting assistant circuit that distinguishes input sources and battery connection and provides an enable signal (ABO—MAX8845Z and ABO — MAX8845Y/MAX8845X/MAX8845W) for system booting. The MAX8845Z/MAX8845Y/MAX8845X/MAX8845W also integrate an overvoltage-protect...