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Product Features

  • Wide 2.7-to-18V Operating Input Range
  • 24V Max Input Blocking Voltage
  • Adjustable Bus Voltage Start-Up Slew Rate for In-rush Current Control
  • Programmable up to 10A Input Current Limit
  • eFuse, Boost, and Buck UV/OV/OC Protection
  • Programmable 5V to 36V Boost Storage Voltage
  • Undetectable Transition from Input Supply to Capacitor Bank Power
  • Compatible with Different Types of Storage Caps:
    • Super Caps, Electrolytic, Tantalum, POSCAP etc.
  • ADC Monitoring of Critical Signals
  • Autonomous Health Monitoring for Detection of Earlier Storage Capacitor Failures
  • Configurable Interrupts to Inform Host for any Faults/Status Change

The ACT4910 device is a highly integrated power loss protection IC. It provides backup storage power in the event of an input power failure. A built-in boost converter provides high voltage energy storage to minimize storage capacitor size requirements. The built-in buck converter regulates the storage voltage to a fixed output voltage. It contains internal, back-to-back eFuse FETs to provide bi-directional input to output isolation. The IC also provides hot swap and inrush current control.

The ACT4910 is very flexible and can easily be configured with I2五分快三计划C and external components. It features programmable storage capacitor voltage to optimize the storage capacitor sizing and system run time. The internal ADC and health monitoring provide an extra layer of protection and improve system reliability and early capacitor failure notification. It automatically checks the storage capacitor health and notifies the user when the energy in the storage caps is not sufficient for backup power. The ADC also measures the input voltage, output voltage, storage voltage, eFuse current, and die temperature. The built-in synchronous buck converter maximizes energy transfer from the storage caps to the system.

ACT4910 provides an I2C bus interface to allow MCU control and monitoring. There are supervisor monitors for the input voltage, output voltage, and storage voltage. It is available with the thermal enhanced QFN 5×5 28 pins package.

Orderable Partnumbers

PART NUMBER Input Voltage Storage Voltage Fsw PACKAGE
ACT4910QW121-T 12V 28V 1130kHz FCQFN5x5-28
ACT4910QW122-T 12V 36V 900kHz FCQFN5x5-28
ACT4910QW123-T 12V 27V 900kHz FCQFN5x5-28
ACT4910QW302-T 3.3V 27V 560kHz FCQFN5x5-28

Advantages of our Power Loss Protection

17m? eFuse Rds(on) at any input voltage Special gate driver circuit design make it suitable for both high voltage and low voltage applications.
High frequency, high efficiency synchronous Buck High backup converter efficiency and current capability, small inductor size.
Autonomous storage cap health monitoring Monitor cap capacitance & ESR and inform host when it’s abnormal, with programmable checking time & threshold.
ADC with programmable UV/OV thresholds Suitable for system monitoring and controlling.



  • Solid State Drive
  • Industrial Applications
  • Backup Power
  • Hot Plug Devices


ACT4910EVK1-121 Evaluation Tool User’s Guide

五分快三计划This document describes the characteristic and operation of the Active Semi ACT4910EVK1-121 evaluation kit (EVK). It provides setup and operation instructions, schematic, layout, BOM, and test data. This EVK demonstrates the ACT4910QW121 eFuse power management IC.

五分快三计划Other ACT4910QWxxx options can be evaluated on this EVK by replacing the IC and any other necessary components.

?ACT4910EVK1-121 GUI

The Active Semi ACT4910?GUI is a graphical interface that gives the user access to the ACT4910 internal registers. It is specifically designed for use with the ACT4910 EVK. The GUI allows the user to both read and modify the registers to configure the EVK specifically for the desired operating conditions. Note that GUI communication with the ACT4910 EVK requires the Active Semi USB-TO-I2C dongle.