MP5048

– 60V, 15A, 7mΩ RDS(ON) HOT-SWAP INTELLI-FUSE SOLUTION

MP5048 Rev. 1.1

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19

4/30/2021

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voltage (VGS). If VGS exceeds a fault threshold

voltage, or VDG drops below the fault threshold,

the FAULT signal remains low until the short is

removed.

Gate-Source Short Detection During Start-Up

For gate-source short detection during the FET

turn-on period (if VOUT drops below 90% of VIN

after the internal maximum 200ms soft-start

time), FAULT is pulled low. Remove the short

and cycle the power on VIN or ON to turn on the

fuse again.

Gate-Source or Gate-Drain Short Detection

During Normal Operation

If VOUT exceeds 90% of VIN while the part

operates normally, the Intelli-Fuse detects the

power FET gate-source or gate-drain short by

checking if VCP - VGATE (where VCP is the internal

charge pump voltage) is below 2V after 200ms

(with no other fault occurring). If this occurs,

FAULT is pulled low. Remove the short and

cycle the power on VIN or ON to turn on the fuse

again.

FAULT

Fault is an open-drain, active-low output that

reports faults detected in the IC.

FAULT Reset

If a fault condition occurs, the MP5048 can be

restarted by pulling the ON pin low, then high

again. This clears the fault, and the MP5048

begins the power-on sequence.

VIN Over-Voltage Protection (OVP)

VIN over-voltage protection (OVP) has a fixed

limit of 64V. If this level is reached, the power

FET turns off. If the device is in latch mode, the

fault can be released by cycling the power on

VIN or ON. If the device is set for hiccup mode,

the power FET will not turn on until the input

voltage falls below 60V.

Under-Voltage Lockout (UVLO)

The under-voltage lockout (UVLO) threshold can

be configured using a resistor divider from the

input to the ON pin. The network can be adjusted

by setting the voltage at which the MP5048 is

able to turn on via VIN.

Current-Sense Output (CS)

CS provides a current proportional to the output

current (the current through the power device).

The current-sense

gain is 25μA/A when the

power FET is fully on. There is a resistor (RCS)

connected to CS to form an external voltage. The

CS pin current (ICS) can be estimated with

Equation (3):

ICS = IOUT x 25µA/A

(3)

Calculate the reference voltage with Equation

Equation (4):

VCS = ICS x RCS

(4)

If VCS reaches the CLREF current limit threshold,

the internal circuit regulates the gate voltage to

hold the current in the power FET constant.

Current Monitor Output (IMON)

The current monitor gain

is 25μA/A. There is a

resistor (RIMON) connected from IMON to ground.

The IMON voltage should be between 0V and

2.5V to keep IMON’s output current linearly

proportional to the output current. The current

can be calculated with Equation (5):

IMON = IOUT x 25µA/A

(5)

Estimate the reference voltage with Equation (6):

VIMON = IMON x RIMON

(6)

The MP5048 current monitor output can be used

by the controller to accurately monitor the output

current. Place a 100nF capacitor from IMON to

GND to smooth the indicator voltage.

Temperature-Sense Output (VTEMP)

VTEMP reports the junction temperature when

there is no thermal gradient on the IC. VTEMP

has a voltage output proportional to the junction

temperature when VCC exceeds its under-voltage

lockout (UVLO) threshold and the MP5048 is in

active mode. The VTEMP output voltage is

10mV/°C, and can be calculated with Equation

(7):

VTEMP = (TJUNCTION x 12.1 - 200) mV

(7)

For example, if the junction temperature is 100°C,

the VTEMP voltage is about 1V. If VTEMP is 0V,

the junction temperature is about 0°C. The total

temperature-sense range is between 0°C and

150°C. If the junction temperature drops below

0°C, the VTEMP voltage remains at 0V.

In multi-fuse operation, the VTEMP pins of each

Intelli-Fuse can be connected to the temperature

monitor pin of the controller (see Figure 15).