LP3972
LP3972 is Power Management manufactured by National Semiconductor.
Description
The LP3972 is a multi-function, programmable Power Management Unit, designed especially for advanced application processors. The LP3972 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 0.725 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 150/300/400 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 5 400 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
DS202076
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Simplified Application Circuit
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Simplified Application Circuit
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- The I2C lines are pulled up via a I/O source
- VINLDO4, 5 can either be powered from main battery source, or by a buck regulator or VIN.
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Connection Diagrams and Package Mark Information
40-Pin Leadless Leadframe Package NS Package Number...
