The RAR-eSR-qLR Retention Alternating Regulator combines two regulation sub-components: a high-efficiency switching regulator (eSR) and an ultra low quiescent linear regulator (qLR). A Regulation Control Unit (RCU) manages booting and transitions between each regulation functions.

Key Benefits

  • Perfect fit for battery-powered IoT applications that require both high-efficiency during active mode and ultra-low power consumption in AON domain during sleep and deep sleep mode
  • Embedded RCU (Regulator Control Unit) to manage booting and mode transitions and to ensure data integrity
  • Configurable output current to fit the application
  • Support of input voltage from 2.7V to 5.5V (Li-Ion, USB supplies)

Key Features

Minimum value
Typical value
Maximum value
Input Voltage
- 2.7 V 5.5 V
Output Voltage
- 0.55 V 3.3 V
Output current configuration
- - 100 mA;200 mA;300 mA;400 mA;500 mA -


  • Smart Headset
  • TWS Earpods
  • Smart Speaker
  • Voice Assistant
  • Hearing aids
  • Voice-controlled devices
  • Bluetooth
  • NB-IoT
  • WiFi
  • GNSS
  • Cellular IoT

Key Performances

  • High Efficiency (up to 95% peak efficiency)
  • Support of input voltage from 2.7V to 5.5V (Li-Ion, USB supplies)
  • 1 mA output current in sleep mode to supply the AON domains
  • Programmable output voltage from 0.55V to 3.3V

Technical information

  • Technology: TSMC 40 uLP