MP5991

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

MP5991 Rev. 1.0

MonolithicPower.com

25

4/27/2022

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2022 MPS. All Rights Reserved.

ILIMIT_SC. Cycle the power on VIN, VDD33, or ON

to enter another tON_DELAY and set a new ILIMIT_SC.

The MP5991 provides five types of short-circuit

current levels that can be selected via the

SCREF pin. Table 1 shows the selectable

short-circuit current limits for different SCREF

voltages

in

standalone

mode

(the

recommended RSCREF value is also shown for

when VSCREF is generated by RSCREF).

Table: 1 Short-Circuit Current Limit Selection for

Different VSCREF in Standalone Mode

VSCREF (V)

RSCREF

ILIMIT_SC (A)

<0.16

Pulled to GND

40

0.24 to 0.36

30

kΩ

60

0.48 to 0.72

60

kΩ

80

0.96 to 1.44

120

kΩ

120

>1.68

200

kΩ

100

In latch-off mode, cycle the power on VIN,

VDD33, or ON to reset FLT_TYPE to 0.1V. This

initiates a soft start, and then MOSET turns on.

In hiccup mode, the device attempts to retry

automatically, and GOK is pulled high after

tRETRY. FLT_TYPE continues to indicate an SC

fault during tRETRY. FLT_TYPE is reset to 0.1V

after tRETRY.

Temperature-Sense Output (VTEMP)

The

VTEMP

pin

reports

the

junction

temperature (TJ) while there is no thermal

gradient on the IC. If VDD33 exceeds its UVLO

rising threshold, then VTEMP is a voltage

output proportional to TJ. The VTEMP voltage

(VTEMP) is 8.7mV/°C, and has a 152.5mV offset.

VTEMP can be calculated with Equation (9):

TEMP

J

V

T 8.7mV 152.5mV

=



+

(9)

For example, if TJ is 100°C, then VTEMP is

1.022V. If VTEMP is 0V, then TJ is -18°C. The

total temperature-sense range is -18°C to

+150°C. If TJ drops below -18°C, then VTEMP is

0V.

During multi-fuse operation, the VTEMP pins of

each Intelli-Fuse can be connected to the

controller’s temperature monitor pin. Connect a

≤1nF capacitor and a ≥10kΩ resistor in parallel

on VTEMP. Figure 14 shows the temperature

sense

function

during

multi-fuse

parallel

operation.

VTEMP OUT

GND

VIN

MP5991

VOUT

VIN

VTEMP OUT

GND

VIN

MP5991

VTEMP

Temperature

ADC

Controller

Figure 14: Temperature Sense during Multi-Fuse

Parallel Operation

Mode Selection (MODE)

The MP5991 provides both latch-off mode and

hiccup mode for the following protections: input

over-voltage protection (OVP), output over-

current

protection

(OCP),

short-circuit

protection (SCP), over-temperature protection

(OTP), and MOSFET GS short protection. The

MODE pin selects either latch-off mode or

hiccup

mode

with

tRETRY.

MODE

also

determines whether the MP5991 operates in

slave mode.

In slave mode, the part operates with the

following conditions:

• The internal I

OCREF (10µA) and ISCREF (10µA)

are disabled, so VOCREF and VSCREF are

controlled by controller.

• The internal V

OCREF_CLAMP

remains active,

and the soft-start clamp voltage (VSS_CLAMP)

controls the soft-start current-limit threshold

• The internal ON current (I

ON)

4.2µA is

disabled.

• If V

CS

exceeds VOCWREF, then D_OC is

pulled low. D_OC is not pulled low if VCS

exceeds 85% of VOCREF.

• Hiccup mode or latch-off mode and t

RETRY

are selected via the controller.

If the device exceeds either the VDD33 or VIN

UVLO rising threshold, then the MODE pin is

detected. Once a mode is selected, it is held

until the power on VDD33 or VIN is cycled

again.

Table 2 on page 26 shows the mode selection

and tRETRY for common resistor values.