RT9941

RT9941 Power Management ICs for Handheld Device General Description The RT9941 is a complete power management IC (PMIC) for handheld device platform. This PMIC contains a fully integrated linear charger for a single cell Lithium Ion battery, five LDO linear regulators and two high efficiency buck converters, a comparator, a reset and an I2C serial interface to program one buck and one regulator output voltages as well as power on timing control for complete flexibility. The linear charger integrates LDO, MOSFET pass element and thermal-regulation circuitry. The proprietary thermalregulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the IC. z Features z Charger Adapter & Battery Two Input with Auto Power Dynamic Path. ` PWR_IN LDO support continuous 1.5A, peak 2A current ` 4.5V to 5.5V Operation Voltage Range with Max. Input 18V from PWR_IN Pin ` Switch Well for LDO and Charger Power MOSFET ` Set Charge Current by ISETA Pin ` Charge Status Indicator ` Interrupt for PWR_IN Plug In/Out Time Out and Charger Done. ` Battery Temperature Monitoring Hysteretic Buck ` Buck 1 for DDR Memory, Adjustable Voltage and 600mA Output Current 2 ` Buck 2 for PDN with 25mV/step I C Adjustable 800mA Output Current ` Max. Efficiency Up to 90% LDO ` LDO1 : 3.3V/500mA for I/O, Default ON ` LDO2 : 1.2V/80mA for PLL, Default ON 2 ` LDO3 : 1.2V/80mA for Pre-Core. I C Adiustable, Sync. with ...