MAX8845Y Datasheet | Maxim Integrated

19-4405; Rev 0; 3/09 28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output .. 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 (300m V at 500m A) - 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 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 achieve high flexibility by providing adjustable fast-charge currents (SETI) and an adjustable top-off current threshold (MIN) through external resistors. The MAX8845Z/ MAX8845Y feature a booting assistant circuit that distinguishes input sources and battery connection and provides an enable signal (ABO- MAX8845Z and ABO-...