MP5991

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

MP5991 Rev. 1.0

MonolithicPower.com

7

4/27/2022

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© 2022 MPS. All Rights Reserved.

PIN FUNCTIONS

Pin #

Name

Description

1, 2,

25, 26, 27,

28, 29, 30,

31, 32

VOUT

Output voltage. The VOUT pin is connected to the source of the integrated power

MOSFET.

3

D_OC

Over-current indication digital output. The D_OC pin is an open-drain output. In

standalone mode, D_OC is pulled low once the CS voltage (VCS) exceeds 85% of the

OCREF voltage (VOCREF). In slave mode, D_OC is pulled low once VCS exceeds the

OCWREF voltage (VOCWREF).

4

ON

MOSFET on/off control. Pull the ON pin above 1.4V to turn the power MOSFET on;

pull ON below 1.2V to turn it off. Do not float ON.

5

GOK

Intelli-Fuse fault reporting output. The GOK pin is an open-drain output. If a fault

occurs, then GOK is pulled low and latches. The following faults that can trigger GOK:

an input over-voltage (OV) fault, an output over-current (OC) fault, a short circuit (SC)

fault, an over-temperature (OT) fault, or a MOSFET health fault.

6

FLT_TYPE

Intelli-Fuse fault type indication output. If a fault occurs, then the FLT_TYPE pin

indicates a voltage level based on the fault type.

7

NC

Not connected. Float the NC pin.

8

MODE

Mode selection. Connect a resistor between the MODE and GND pins to select the

operation mode (latch-off mode, hiccup mode, or slave mode).

9, 10, 11,

12, 13, 14,

15, 16, 33

VIN

System input power supply. The VIN pin is connected to the drain of the MOSFET.

17

SCREF_

OCWREF

Multifunctional (short-circuit current limit and over-current warning reference in

slave mode). The SCREF_OCWREF pin is a multifunctional pin. To select the short-

circuit current limit (ILIMIT_SC), the MP5991 samples the SCREF voltage (VSCREF) during

the MOSFET turn-on insertion delay time (tON_DELAY). Then the device can set ILIMIT_SC

to 40A, 60A, 80A, 100A, or 120A. SCREF_OCWREF is also used as the OC warning

reference in slave mode.

18

VTEMP

Junction temperature sense output. Place a

≤1nF capacitor and a ≥10kΩ resistor

in parallel on the VTEMP pin.

19

SS

Soft-start time setting. An external capacitor connected to the SS pin sets the soft-

start time (tSS). The internal circuitry controls the output voltage (VOUT) slew rate

during start-up.

20

GND

Signal ground.

21

VDD33

Internal 3.3V LDO output. Place a

≥1µF decoupling capacitor close to the VDD33

and GND pins.

22

IMON

Current monitor output. The IMON pin reports the current flowing through the power

device. Connect a resistor between the IMON and GND pins to generate the IMON

voltage (VIMON). Place a 2.2nF to 100nF capacitor in parallel to reduce noise and

maintain a smooth voltage.

23

CS

Current-sense output. VCS is compared to VOCREF to determine the OC limit. The CS

pin is also used to assert D_OC. If VCS exceeds 85% of VOCREF in standalone mode,

then D_OC is pulled low. If VCS exceeds VOCWREF in slave mode, then D_OC is pulled

low. Connect a resistor between the CS and GND pins to generate VCS.

24

OCREF

Current-limit reference voltage input. Connect a 1nF to 10nF capacitor between

the OCREF and GND pins to reduce noise and maintain a smooth voltage.