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ACT2861QI---30V Buck-Boost Charger with Integrated MOSFETs and OTG

BENEFITS and FEATURES • Wide VIN Range: 3.9V to 29V (No Dead Zone) • Supports 2 to 5 Cell Lithium-ion Batteries • Supports OTG Function (5V ~ 22.5V Input) with wide range of output voltages • OTG output supports QC3.0 / USB PD + PPS output levels and transition times • Programmable Frequency: 125KHz, 250KHz, 500kHz, and 1MHz • 2V ~ 5.1V/100mA Programmable Output LDO • Precision 0.5% Voltage Reference • +/-4% Output Constant Current Regulation • < 5 μA Leakage Current from Battery in Shipping Mode • Programmable Charge Voltage via I2C • Programmable Charge Current via Pin and I2C • Programmable Soft-Start • Programmable Safety Timer • Battery Path Impedance Compensation • JEITA Compliant • Cycle-by-Cycle Current Limit • Built in ADC for Temperature, Input and Output Voltage and Current monitoring • Thermal Regulation and Protection • 25mΩ FET from VIN to SW1 • 25mΩ FET from SW2 to VOUT • 35mΩ FET from SW1 to PGND • 35mΩ FET from SW2 to PGND • Low Output Ripple • Thermally Enhanced 32-Lead 4mx4mm QFN APPLICATIONS • Multi Cell Battery Charger • Portable Battery-Powered Devices • Car Charger • Power Bank • 24V Industrial Applications • Automotive Power Systems • Multiple Power Source Supplies • DC UPS • Solar Powered Devices • Solid-State Lighting GENERAL DESCRIPTION The ACT286x is a buck-boost charger with 4 integrated MOSFETs. It offers a high efficiency, low component counts, compact solution for 2 to 5 cell battery charging application. It can operate from an input voltage range from 3.9V to 29V. The 4 internal low resistance NMOS switches minimize the size of the application circuit and reduce power losses to maximize efficiency. Internal high side gate drivers, which require only the addition of two small external capacitors, further simplify the design process. An advanced switch control algorithm allows the buckboost converter to maintain output voltage regulation with input voltages that are above, below or equal to the output voltage. Transitions between these operating modes are seamless and free of transients and subharmonic switching. The ACT286x has been optimized to reduce input current in shipping, shutdown, and standby for applications which are sensitive to quiescent current draw, such as battery-powered devices. Both the input side and output side voltages and currents can be configured by resistors or the I2C serial interface. The system can be monitored and configured by I2C as well. The build-in ADC can be read for the information of input/output voltages and currents, and the die temperature. With a MCU, it can easy to charge a multi cell battery pack from a variety of input power sources. The IC provides various safety features for system operation. The thermal regulation reduces output current when the junction temperature exceeds 120°C (programmable). The ACT286x is available in 32-pin, 4x4 mm QFN package.
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