28V Dual Input Linear Li+ Battery Chargers - Maxim Integrated Products
Description
19-4279; Rev 0; 3/09
EVALUATION KIT AVAILABLE
28V Dual Input Linear Li+ Battery Chargers with Battery Detection and Overvoltage-Protected Output
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General Description
Features
♦ CCCV, Thermally Regulated Linear One-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 ♦ Input Overvoltage Protected 4.
7V Output (SAFEOUT) from IN ♦ Input Overvoltage Protected 4.
7V Output (SAFEUSB) from USB ♦ 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, MAX8844Z) ♦ Output for Autobooting (ABO, MAX8844Y) ♦ Tiny 3mm x 3mm, 14-Pin TDFN Package, 0.
8mm Height (max)
MAX8844Z/MAX8844Y
The MAX8844Z/MAX8844Y intelligent, stand-alone constant-current, constant-voltage (CCCV), thermally regulated dual input linear chargers are designed for charging a single-cell lithium-ion (Li+) battery.
The MAX8844Z/MAX8844Y 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 IC controls 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 IC is exposed to high ambient temperatures, allowing maximum charging current without damaging the IC.
The MAX8844Z/MAX8844Y achieve high flexibility by providing adjustable fast-charge currents (SETI) and an adjustable top-off current threshold (MIN) through external resistors.
The IC features a booting assistant c...
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