LP3971 Datasheet | National Semiconductor

Description The LP3971 is a multi-function, programmable Power Management Unit, designed especially for advanced application processors. The LP3971 is optimized for low power handheld applications and provides 6 low dropout, low noise linear regulators, three DC/DC magnetic buck regulators, a back-up battery charger and two GPIO’s. A high speed serial interface is included to program individual regulator output voltages as well as on/off control. .. Features n patible with advanced applications processors requiring DVM (Dynamic Voltage Management) n Three buck regulators for powering high current processor functions or I/O’s n 6 LDO’s for powering RTC, peripherals, and I/O’s n Backup battery charger with automatic switch for lithium-manganese coin cell batteries and Super capacitors n I2C patible high speed serial interface n Software control of regulator functions and settings n Precision internal reference n Thermal overload protection n Current overload protection n Tiny 40-pin 5x5 mm LLP package Key Specifications Buck Regulators n Programmable VOUT from 0.8 to 3.3V n Up to 95% efficiency n Up to 1.6A output current n ± 3% output voltage accuracy LDO’s n Programmable VOUT of 1.0V- 3.3V n ± 3% output voltage accuracy n 150/300/370 m A output currents - LDO RTC 30 m A - LDO 1 300 m A - LDO 2 150 m A - LDO 3 150 m A - LDO 4 150 m A - LDO 5 370 m A n 100 m V (typ) dropout Applications n n n n n PDA phones Smart phones Personal Media Players Digital cameras Application processors - Intel Xscale - Freescale - Samsung © 2006 National Semiconductor Corporation DS201807 .national. Simplified Application Circuit .. Connection Diagrams and Package Mark Information 40-Pin Leadless Leadframe Package NS Package Number SQF40A Note: Circle marks pin 1 position. .national. Connection Diagrams and Package Mark Information Package Mark (Continued) Top View .. Note: The actual physical placement of the package marking will vary...