LP3974 - High Performance Power Management Unit for Application Processors.
LP3974是TI公司的一款无产品，LP3974是High Performance Power Management Unit for Application Processors.，本页介绍了LP3974的产品说明、应用、特性等，并给出了与LP3974相关的TI元器件型号供参考。
LP3974 - High Performance Power Management Unit for Application Processors. - 无 - 电源管理多通道IC(PMIC)解决方案 - TI公司（Texas Instruments，德州仪器）
产品描述
The LP3974 is designed to meet the power management requirements of the latest cellular phones. The LP3974 PMU contains a single-input Li-Ion battery charger, 16 low-dropout voltage regulators (including 5 wide input low-output regulators, 2 over-voltage protected voltage regulators, and 4 buck regulators), dual DPDT analog switches, real time clock, and backup battery charger. Programming is handled via an I 2C-compatible high-speed Serial Interface allowing control of program on/off conditions and the output voltages of individual regulators, and to read status information of the PMU.
It can charge and maintain a single cell Li-Ion battery operating from an AC adapter or USB power source.
The Li-Ion charger requires few external components and integrates the power FET. Charging is thermally regulated to obtain the most efficient charging rate for a given ambient temperature.
Over-Voltage Protection (OVP) circuit at the charger input protects the PMU from input voltages up to +28V, eliminating the need for any external protection circuitry.
Buck regulators have an automatic switch to ECO mode at low load conditions providing very good efficiency at low output currents.
General-type LDO regulators provide excellent PSRR and ULTRA LOW NOISE, 45 μV typ., ideally suited for supplying voltage to RF section.
The real-time clock/calendar provides time interval information as well as two programmable alarms.
To accommodate different processor requirements, the LP3974 PMU can have three different default voltage settings and startup sequences selected by external pin.
Notice: This document is not a full datasheet. For more information regarding this product or to order samples please contact your local National Semiconductor sales office or visit http://www.national.com/support/dir.html
产品特性
Linear charger with single inputUSB or AC adapter input28V OVP on the charger input Four high-efficiency Synchronous Magnetic Buck Regulators:2 x 1A, 2 x 800 mA2 regulators have DVS supportHigh-efficiency ECO mode @ low IOUTCan be used with inductors as low as 1µH @ 4MHz clockBuck1, Buck2 and Buck4 have ramp control to change rate of change of output 11 General-type Low Noise LDOs7 x 300 mA2 x 450 mA2 x 150 mA 5 wide-input low-output (WILO) LDOs 2 x 10 mA1 x 50 mA2 x 150 mA All LDOs S/W configurable Two over-voltage protected outputs for USB transceivers Real time clock with two alarms Back-up battery charger Momentary Power Loss detection Interrupt Request to reduce S/W polling I 2C-compatible Serial Interface 100-bump 0.4 mm pitch micro SMDxt package
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