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

• ADC08832 - 具有多路复用器和采样/保持功能的 8 位串行 I/O CMOS A/D 转换器
• SN74S1051 - 12 位肖特基屏障二极管总线终端阵列
• SN74F38 - 具有集电极开路输出的四路 2 输入正与非缓冲器
• DS92LV3221 - 20-50 MHz 32 位频道链接 II 串行器
• DAC7718 - 12-Bit, Octal, Ultra-Low-Glitch, Voltage-Output, Digital-to-Analog Converter
• SN74AUC08 - 四路 2 输入正与门
• SN74S260 - 双路 5 输入正或非门
• TS3DS10224 - 高速 2:4 差动多路复用器/多路解复用器
• SN75ALS161 - 八路通用接口总线收发器
• TAS5182 - 100W 立体声数字放大器功率级控制器