MAX8845Z

19-4405; Rev 0; 3/09 28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output www.datasheet4u.com General Description Features ♦ CCCV, Thermally Regulated Linear 1-Cell Li+ Battery Charger ♦ No External MOSFET, Reverse Blocking Diode, or Current-Sense Resistor ♦ Programmable Fast-Charge Currents (1ARMS max) ♦ Programmable Top-Off Current Threshold (MIN) ♦ Input Overvoltage Protected 4.7V Output (SAFEOUT) ♦ Proprietary Die Temperature Regulation Control (+115°C) ♦ 4.25V to 28V Input Voltage Range with Input Overvoltage Protection Above +7.5V ♦ Low-Dropout Voltage (300mV at 500mA) ♦ Input Power-Source Detection Output (POK), Charge Status Output (CHG), Charge-Enable Input (EN) ♦ Output for Autobooting (ABO—MAX8845Z, ABO—MAX8845Y) ♦ Tiny, 3mm x 3mm 12-Pin Thin QFN Package, 0.8mm Height (max) MAX8845Z/MAX8845Y The MAX8845Z/MAX8845Y 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 integrate a current-sense circuit, MOSFET pass element, thermal-regulation circuitry, and eliminates 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 d...