LP3917 - National Semiconductor

LP3917 CDMA Cellular Phone Power Management

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 regula.

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
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■ Key Specifications
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■ 3.0V to 5.5V Input Voltage Range 170 mV typ Dropout Voltage on LDO's @ 3.