AS3709 Power Management Unit

5 buck DC-DCs, 2 LDOs, programmable startup


  • 5 DC-DC step down regulators (2-4MHz)
  • 2 universal IO LDOs
  • OTP programmable boot and power-down sequence
  • Standby function with programmable sequence and voltages
  • Control Interface, I2C/SPI control lines, ON key with 4/8s emergency shut down, POR with RESET I/O


  • Compact design due to small coils for IO and memory voltage generation
  • Independent voltage rails for general purpose IO supplies
  • Flexible and fast adaptation to different processors/applications
  • Power saving control according to the processor’s needs
  • Self-contained start up and control for single-cell battery applications; safety shutdown feature

Product parameters

DC-DC Step Up Converters
DC-DC Step Down Converters 5x1A or 3x1A + 1x2A or 2x1A + 1x3A or 1x1A + 2x2A or 1x2A + 1x3A
Special LDOs [mA]
Universal LDOs [mA] 2x300
Current Sinks [mA]
Charge Pump [V/mA]
Audio DAC [dB SNR]
Audio ADC [dB SNR]
Audio Features
General Purpose ADC [bit]
Customizable Startup Sequences Programmable
Package QFN-32 (4x4)

General Description

The AS3709 features 5 high-efficiency, constant-frequency synchronous buck converters and two universal LDOs. The input voltage range (2.7V to 5.5V), automatic power save mode and minimal external component requirements make the AS3709 perfect for any single Li-ion battery-powered or fixed 3.3V/5V supply application.

Not Recommended for New Designs
ams AG is discontinuing production of this device.

This product suits for the following applications:

  • SSDs, mobile communication devices
  • Laptops and PDAs
  • Ultra-low power systems
  • Medical instruments or any other space-limited application with low power consumption requirements


Title Category Headline Buy
AS3709EvalKit Application Board Evaluation Kit for AS3709

Technical Documents

Type Description Language
Datasheet Document version 1-06 English


Type Description Language
EoL Notification AS2540, AS13xx, AS3668, AS3709, AS371x, AS7620 (issued 2019-Jun) English

Other Information

Type Description Language
Block Diagram AS3709 Block Diagram English