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.

• 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
• I2C Compatible High Speed Serial Interface
• Software Control of Regulator Functions and Settings
• Precision Internal Reference
• Thermal Overload Protection
• Current Overload Protection
• Tiny 40-pin 5x5 mm WQFN Package

Key Specifications

• Buck Regulators
  • Programmable VOUT from 0.725 to 3.3V
  • Up to 95% Efficiency
  • Up to 1.6A Output Current
  • ±3% Output Voltage Accuracy
• LDO’s
  • Programmable VOUT of 1.0V–3.3V
  • ±3% output voltage accuracy
  • 150/300/370 mA output currentsLDO RTC 30 mALDO 1 300 mALDO 2 150 mALDO 3 150 mALDO 4 150 mALDO 5 370 mA
  • 100 mV (typ) dropout