BENEFITS and FEATURES

• Wide 2.7-to-8V Operating Input Range

• 10V Max Input Blocking Voltage

• Adjustable Bus Voltage Start-Up Slew Rate for In-rush Current Control

• Configurable Input power Failure Level

• Programmable up to 10A Input Current Limit

• Programmable 5V to 36V Boost Storage Voltage

• 36V@6A Synchronous Buck Supports 100% Duty Cycle

• Programmable up to 1.13MHz Buck Operating Frequency for Small Inductor Size

• 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

• eFuse, Boost, and Buck UV/OV/OC Protection

• Thermal Alert and Protection

• Thermal Enhanced FCQFN 5x5-28 package

APPLICATIONS

• Solid State Drives

• Industrial Applications

• Backup Power

• Hot Plug Devices

GENERAL DESCRIPTION

The ACT4911 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 ACT4911 is very flexible and can easily be configured with I2C 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.

ACT4911 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 5x5 28 pins package.