Power Management 49-Pin uSMDXT T/R

LP3917 is a complete Power Management Unit designed for CDMA cellular phones. LP3917 PMU contains 9 low noise low dropoutvoltage regulators, 2 buck regulators, an USB Transceiver, two comparators and a high speed serial interface to program on/offconditions 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 outputcurrents. 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.

Two high efficiency Synchronous Magnetic Buck Regulators, I_OUT 800 mA and 600 mA
High efficiency PFM mode @ low I_OUT
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