MP5921

– 16V, 50A, 1mΩ RDS(ON), HOT-SWAP INTELLI-FUSE SOLUTION

MP5921 Rev. 1.1

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14

5/17/2022

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PIN FUNCTIONS

Pin #

Name

Description

1 - 4, 18

VIN

System input power supply. The MP5921 operates from a 4V to 16V input rail.

5 - 17

OUT

Output voltage controlled by the IC. OUT is connected to the source of the

integrated MOSFET.

19

D_OC

Digital output of the over-current indication. D_OC is an open-drain output. When

the CS voltage (VCS) is higher than 85% of CLREF, the D_OC logic is pulled low.

20

ON/PD

Power FET on/off control or OUT voltage pull-down mode control. Drive ON/PD

above 1.4V to turn on the power FET. Drive ON/PD low to turn off the power FET.

Force the ON/PD voltage to around 1V to pull down VOUT with an integrated 500

Ω

resistor after a 2.1ms delay. Connect a 10k

Ω resistor from ON/PD to the hot-swap

controller when the MP5921 is controlled by the controller. Do not float ON/PD.

21

CLREF

Current-limit reference voltage input.

22

CS

Current sense output. CS requires an external resistor. The CS voltage (VCS) is

compared with CLREF to determine the current limit.

23

IMON

Current monitor output. The output current is proportional to the current flowing

through the power device.

24

VDD3

Internal 3.0V LDO output. VDD3 can be driven with an external 3.3V to reduce loss

from VIN. Place a 1µF decoupling capacitor close to VDD3 and GND.

25

GND

Signal ground.

26

SS

Soft-start set. An external capacitor connected to SS sets the soft-start time of the

output voltage. The internal circuit controls the slew rate of the output voltage during

turn-on.

27

GOK

Intelli-Fuse fault reporting output. GOK asserts low and latches after a fault occurs.

The faults that can trigger GOK include over-current fault (during normal operation),

short-circuit fault, over-temperature fault, and FET health fault. GOK is an open-drain

output pin.

28

VTEMP

Junction temperature sense output.