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

34 of 37

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ACT4910

Power Loss Protection with 6A eFuse

®

CMI 125: ACT4910QW125

CMI 125 is designed for standard 12V applications. CMI 125 default settings are appropriate for most typical applications.

It uses a 950mA boost current limit setting to limit inrush current and still quickly charge up the storage caps. It provides

a 1130kHz buck switching frequency. The default storage voltage is 28V 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

EN_OV_REF setting is changed to 1V to allow a wider undervoltage to overvoltage range than with CMI 121. The table

below shows the default register settings.

Table 13: CMI 125 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

96%

0x20h

HMON_THR[3:0] = 0101

Enable Overvoltage Reference

1.00V

0x20h

EN_OV_REF[2:0] = 011

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

28V

0x21h

BST_VSET[4:0] = 10111

Buck Peak Current Limit

9A

0x26h

BK_CLIM[1:0] = 11

Buck Switching Frequency

1130kHz

0x28h

BK_FREQ[2:0] = 111

I2C Address

The CMI 125 7-bit I2C address is 0x5Ah. This results in 0xB4h for a write address and 0xB5h for a read address.

Device ID

The CMI 125 Device ID (register 0x3Bh) = 0x06h. 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.