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Qorvo

ACT4921 Datasheet Preview

ACT4921 Datasheet

Power Loss Protection

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ACT4921
Power Loss Protection with 6A eFuse
FEATURES
Optimized for Low Voltage Applications
2.6-to-7V Operating Input Range
8V Max Input Blocking Voltage
Adjustable In-rush Current Control
Configurable Input Power Failure Level
Programmable up to 6A Input Current Limit
Programmable 5V to 28V Boost Storage Voltage
28V@4A Synchronous Buck Supports 100%
Duty Cycle
Programmable up to 2.25MHz Buck Operating
Frequency for Small Inductor Size
Power Loss, Vout Power Good, and Storage Cap
Power Good Indicators
Compatible with Different Types of Storage Caps:
Super Caps, Electrolytic, Tantalum, POSCAP etc.
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 4x4-32 package
APPLICATIONS
Solid State Drives
Power Backup Systems
Industrial Applications
eFuse
Hot Plug Devices
GENERAL DESCRIPTION
The ACT4921 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 ACT4921 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 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 built-in synchronous
buck converter maximizes energy transfer from the
storage caps to the system.
ACT4921 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
4x4 32 pin package.
Input 2.6V7V
Blocking up to 8V
eFuse 20mΩ
Inrush Controller
2.6V6V
Caps
Health Monitor/
5V-28V
ADC
Blocking
FET
5V-28V
28V Buck/Boost
Controller
40mΩ
FET
25mΩ
FET
PMU
System
Core/Flash
Data Sheet Rev. 2.0, January 27, 2020 | Subject to change without notice
1 of 35
www.qorvo.com




Qorvo

ACT4921 Datasheet Preview

ACT4921 Datasheet

Power Loss Protection

No Preview Available !

ACT4921
Power Loss Protection with 6A eFuse
FUNCTIONAL BLOCK DIAGRAM
ISET
SS
VINS
EN
VIN
QeFuse1
VOUT
QeFuse2
QBLOCK
VB
STR
Health
Monitor
DISCH
HSB
FET Controller
QHS
SW
UV
PGND
OV
QLS_BOOST
QLS_BUCK
ENB
Main
SCL
Controller
SDA
Bu ck/Bo ost
Controller
FB
COMP
nIRQ
PLI
PG_STR
VREF
BSET
REF
PG_VO
AGND
Data Sheet Rev. 2.0, January 27, 2020 | Subject to change without notice
2 of 35
www.qorvo.com


Part Number ACT4921
Description Power Loss Protection
Maker Qorvo
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