LP3921

LP3921 www.ti.com SNVS580A – AUGUST 2008 – REVISED MAY 2013 LP3921 Battery Charger Management and Regulator Unit with Integrated Boomer™ Audio Amplifier Check for Samples: LP3921 FEATURES 1 23 Charger – DC Adapter or USB Input – Thermally Regulated Charge Current – Under Voltage Lockout – 50 to 950 mA Programmable Charge Current 3.0V to 5.5V Input Voltage Range Thermal Shutdown I2C-Compatible Interface for Controlling Charger, LDO Outputs and Enabling Audio Output LDO's 7 Low-Noise LDO’s – 2 x 300 mA – 3 x 150 mA – 2 x 80 mA 2% (typ.) Output Voltage Accuracy on LDO's Audio – Fully Differential Amplification – Ability to Drive Capacitive Loads up to 100 pF – No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required Space-Efficient 32-pin 5 x 5 mm WQFN Package APPLICATIONS CDMA Phone Handsets Low Power Wireless Handsets Handheld Information Appliances Personal Media Players DESCRIPTION The LP3921 is a fully integrated charger and multiregulator unit with a fully differential Boomer audio power amplifier designed for CDMA cellular phones. The LP3921 has a high-speed serial interface which allows for the integration and control of a Li-Ion battery charger, 7 low-noise low-dropout (LDO) voltage regulators and a Boomer audio amplifier. The Li-Ion charger integrates a power FET, reverse current blocking diode, sense resistor with current monitor output, and requires only a few external components. Charging is thermally regulated to ob...