LP3917

www.DataSheet4U.com LP3917 CDMA Cellular Phone Power Management Unit December 2006 LP3917 CDMA Cellular Phone Power Management Unit General Description LP3917 is a complete Power Management Unit designed for CDMA cellular phones. LP3917 PMU contains 9 low noise low dropout voltage regulators, 2 buck regulators, an USB Transceiver, two comparators and a high speed serial interface to program on/off conditions and output voltages of individual regulators, and to read status information of the PMU. Buck regulators have an automatic switch to PFM mode at low load conditions allowing very good efficiency also at low output currents. LDO regulators provide very low noise, 35 uV typ, ideally suited for supplying voltage to RF section. Two comparators can be used for detecting external accessories like ear plug etc. LP3917 can use interrupt for alerting BB processor of status changes instead of using inefficient status polling. Features ■ Two high efficiency Synchronous Magnetic Buck Regulators, IOUT 800 mA and 600 mA High efficiency PFM mode @ low IOUT Auto Mode PFM/PWM switch Low inductance 2.2 uH @ 2 MHz clock 9 Low Noise LDO's 3 x 300 mA 5 x 150 mA 1 x 80 mA SW controllable LDO outputs USB 2.0 compatible Transceiver (12 Mbps) Thermal Shutdown with Early Warning Alarm Very low Sleep mode current Battery Voltage Monitor output Interrupt Request for reducing SW polling Ultra small 3.5x3.5 mm Micro SMDxt 49 bump package ■ ■ Key Specifications ■ ■ ■ ■ ■ 3.0V to 5.5V Input Voltag...