MP5921

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

MP5921 Rev. 1.1

www.MonolithicPower.com

22

5/17/2022

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VTEMP OUT

GND

VIN

MP5921

VOUT

VIN

VTEMP OUT

GND

VIN

MP5921

VTEMP

Temperature

ADC

Controller

Figure 11: Multi-Fuse Temperature Sense

Utilization in Paralleling

Thermal Protection

The Intelli-Fuse temperature is sensed by

internally monitoring the junction temperature of

the IC. The temperature information can be

read from VTEMP.

The Intelli-Fuse has thermal protection. When

the junction temperature exceeds the threshold

(143°C), the power FET is turned off, and GOK

is pulled low.

VDD3 Sub-Regulator

The MP5921 has an internal 3.0V linear sub-

regulator that steps down the input voltage to

generate a 3.0V power supply. VDD3 can be

driven with an external 3.3V to reduce sub-

regulator loss from VIN.

Under-Voltage Lockout (UVLO) Protection

The MP5921 has two under-voltage lockout

(UVLO) protections: a 2.41V VDD3 UVLO and

a 2.91V VIN UVLO. The MP5921 can start up

only when both VDD3 and VIN exceed their

respective UVLO thresholds. The MP5921

shuts down when either the VDD3 voltage is

lower than the UVLO falling threshold voltage

(typically 2.04V) or VIN is lower than the VIN

falling

threshold

(2.58V).

Both

UVLO

protections are non-latch off.