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Power Management Unit for Advanced Application Processors



  • Compatible with advanced applications processors requiring DVM (Dynamic Voltage Management)
  • Three buck regulators for powering high current processor functions or I/O's
  • 6 LDO's for powering RTC, peripherals, and I/O's
  • Backup battery charger with automatic switch for lithium-manganese coin cell batteries and Super capacitors
  • I 2C compatible high speed serial interface
  • Software control of regulator functions and settings
  • Precision internal reference
  • Thermal overload protection
  • Current overload protection
  • Tiny 40-pin 5 x 5 mm LLP package


  • PDA phones
  • Smart phones
  • Personal Media Players
  • Digital cameras
  • Application processors
         __Intel Xscale


Texas Instruments  LP3971SQ-B410EV

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.

Key Specifications:

Buck Regulators:

  • Programmable V QUT from 0.725 to 3.3V
  • Up to 95% efficiency
  • Up to 1.6A output current