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MAX8845Z

Maxim Integrated Products
Part Number MAX8845Z
Manufacturer Maxim Integrated Products
Description 28V Linear Li+ Battery Chargers
Published Jun 5, 2009
Detailed Description 19-4405; Rev 0; 3/09 28V Linear Li+ Battery Chargers with Battery Detection and Overvoltage Protected Output www.datash...
Datasheet PDF File MAX8845Z PDF File

MAX8845Z
MAX8845Z

Overview
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 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—MA...


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