Data Sheet Rev. E August 2021 | Subject to change without notice

32 of 37

www.qorvo.com

ACT4910

Power Loss Protection with 6A eFuse

®

CMI 122: ACT4910QW122

CMI 122 is designed for standard 12V applications. CMI 122 default settings are appropriate for most typical applications.

It provides the 900kHz buck switching frequency to compromise size and efficiency. The default storage voltage is 36V

which allows for maximum capacitor energy storage. Placing a resistor between BSET and VSS can program the default

storage voltage to a lower value. The table below shows the default register settings.

CMI 122 Default Register Settings

Function

Value

Register

Register Settings

PLI Pin Function

PLI & VOUT OK

0x19h

PLI_FUNC_SEL[1:0] = 11

Health Monitor Time

32ms

0x1Fh

HMON_TSET[3:0] = 0100

Health Monitor Threshold

97.2%

0x20h

HMON_THR[3:0] = 1011

Enable Overvoltage Reference

0.92V

0x20h

EN_OV_REF[2:0] = 010

Startup Delay

0ms

0x20h

EN_STARTDELAY = 0

Latch Supplement Mode

Yes

0x21h

EN_LATCH_SPLMNT = 1

Boost Current Limit

950mA

0x21h

BST_CLIM[1:0] = 10

Boost Voltage

36V

0x21h

BST_VSET[4:0] = 11111

Buck Peak Current Limit

9A

0x26h

BK_CLIM[1:0] = 11

Buck Switching Frequency

900kHz

0x28h

BK_FREQ[2:0] = 110

I2C Address

The CMI 122 7-bit I2C address is 0x5Ah. This results in 0xB4h for a write address and 0xB5h for a read address.

Device ID

The CMI 122 Device ID (register 0x3Bh) = 0x03h. This can be used to distinguish between different CMI versions.

Autonomous ADC Supervisory Function

The autonomous ADC supervisory function is disabled by default. All undervoltage register value are set to 0x00h and

all overvoltage register values are set to 0xFFh.