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

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ACT4910

Power Loss Protection with 6A eFuse

®

CMI 302: ACT4910QW302

CMI 302 is designed for standard 3.3V applications. CMI 302 default settings are appropriate for most typical

applications. It uses a 650mA boost current limit setting to limit inrush current and still quickly charge up the storage

caps. It provides a 560kHz buck switching frequency. The default storage voltage is 27V for compatibility with 80%

derated 35V capacitors. 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 302 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

95%

0x20h

HMON_THR[3:0] = 0000

Enable Overvoltage Reference

0.82V

0x20h

EN_OV_REF[2:0] = 001

Startup Delay

125ms

0x20h

EN_STARTDELAY = 1

Latch Supplement Mode

Yes

0x21h

EN_LATCH_SPLMNT = 1

Boost Current Limit

650mA

0x21h

BST_CLIM[1:0] = 01

Boost Voltage

27V

0x21h

BST_VSET[4:0] = 10110

Buck Peak Current Limit

5A

0x26h

BK_CLIM[1:0] = 00

Buck Switching Frequency

560kHz

0x28h

BK_FREQ[2:0] = 100

I2C Address

The CMI 302 7-bit I2C address is 0x5Ah. This results in 0xB4h for a write address and 0xB5h for a read address.

Device ID

The CMI 302 Device ID (register 0x3Bh) = 0x05h. 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 values are set to 0x00h and

all overvoltage register values are set to 0xFF

Health Check

The health check function is disabled by default.