MP5981

– 16V, 50A, 1.1mΩ RDS(ON), HOT-SWAP INTELLI-FUSE SOLUTION

MP5981 Rev. 1.3

MonolithicPower.com

5

5/16/2022

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PIN FUNCTIONS

Pin #

Name

Description

9-16

VIN

System input power supply. The MP5981 operates from a 4V to 16V input rail.

1, 2,

25-32

VOUT

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

MOSFET.

3

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.

4

ON/PD

Power FET on/off control and VOUT pull-down mode control. Drive ON/PD between

1.4V and 3V to turn the power FET on; drive ON/PD low to turn the power FET off. Do not

float ON/PD. To pull down VOUT after a 2.1ms delay, use an integrated

500Ω resistor to

force ON/PD to about 1V. If the MP5981 is controlled by the hot-swap controller, connect

a 10k

Ω resistor from ON/PD to GND.

5

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.

6, 7

NC

No connection.

8

MODE

Latch or hiccup operation. If the mode pin is pulled to GND, the MP5981 operates in

hiccup mode and automatically retries after ~560ms. The MODE pin has an internal pull

up, and if not pulled low externally will default to latch mode operation.

17

NC

No connection. Connect this pin to GND.

18

VTEMP

Junction temperature sense output.

19

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.

20

GND

Signal ground.

21

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.

22

IMON

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

the power device.

23

CS

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

compared with CLREF to determine the current limit.

24

CLREF

Current-limit reference voltage input.

ABSOLUTE MAXIMUM RATINGS (1)

VIN (DC) .......................................-0.3V to +20V

VIN (1

μs).................................................... +24V

VIN (25ns).................................................. +29V

VOUT ............................................-0.3V to +20V

All other pins ................................-0.3V to +4.2V

Continuous power dissipation (TA = 25°C) (2)

................................................................. 5.34W

Junction temperature ................................150°C

Lead temperature .....................................260°C

Storage temperature ................ -65°C to +155°C

Recommended Operating Conditions (3)

Input voltage operating range ............. 4V to 16V

Operating junction temp (TJ) .... -40°C to +125°C

Thermal Resistance (4)

θJA

θJC

LGA-32 (5mmx5mm) ............ 23.4 ....12.5 . °C/W

Notes:

1) Exceeding these ratings may damage the device.

2) The maximum allowable power dissipation is a function of the

maximum junction temperature TJ (MAX), the junction-to-

ambient thermal resistance θ

JA, and the ambient temperature

TA. The maximum allowable continuous power dissipation at

any ambient temperature is calculated by PD (MAX) = (TJ

(MAX) - TA) / θJA. Exceeding the maximum allowable power

dissipation produces an excessive die temperature, causing

the regulator to go into thermal shutdown. Internal thermal

shutdown circuitry protects the device from permanent

damage.

3) The device is not guaranteed to function outside of its

operating conditions.

4) Measured on JESD51-7, 4-layer PCB.