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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 I<sup>2</sup>C serial interface to program one buck and one regulator output voltages as well as power on timing control for complete flexibility.<br />The linear charger integrates LDO, MOSFET pass element and thermal-regulation circuitry. The proprietary thermal- regulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the IC.<br />The two step-down converters are optimized for small size inductor and high efficiency applications. They utilize a proprietary hysteretic PWM control scheme that switches with nearly fixed frequency and is adjustable, allowing the customer to trade some efficiency for smaller external component as desired.<br />The LDO linear regulators provide high power supply rejection rate and have only 45μV<sub>RMS</sub> of output noises for 100Hz to 10kHz frequency range to power noise sensitive RF sections.<br />The RT9941 is available in WQFN-40L 5x5 package. </p>
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<div class="spec-list"><ul class="lv1"><li>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 </li><li>Hysteretic Buck♦ Buck 1 for DDR Memory, Adjustable Voltage and 600mA Output Current♦ Buck 2 for PDN with 25mV/step I<sup>2</sup>C Adjustable 800mA Output Current♦ Max. Efficiency Up to 90% </li><li>LDO♦ LDO1 : 3.3V/500mA for I/O, Default ON♦ LDO2 : 1.2V/80mA for PLL, Default ON♦ LDO3 : 1.2V/80mA for Pre-Core. I<sup>2</sup>C Adiustable, Sync. with Buck2, Default ON♦ LDO4 : 2.5V/50mA for AVDD of USB, ADC, TSC, Default ON♦ LDO5 : 3.3V/50mA for AVDD of USB, Default ON♦ Minimize the External Component Counts </li><li>Other♦ System Reset♦ Low Voltage Detector♦ I<sup>2</sup>C Compatible Interface♦ Power ON Timing Control </li><li>RoHS Compliant and Halogen Free </li></ul></div>
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<div class="spec-list"><ul class="lv1"><li>GPS and PDA </li><li>Handheld Devices </li></ul></div>
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