MP5048

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

MP5048 Rev. 1.1

www.MonolithicPower.com

20

4/30/2021

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© 2021 MPS. All Rights Reserved.

VTEMP OUT

GND

VIN

MP5048

VIN

VTEMP OUT

GND

VIN

MP5048

VTEMP

Temperature

ADC

Controller

VOUT

Figure 15: Multi-Fuse Temperature-Sense

Utilization during Parallel Operation

Current Balance for Parallel Operation

Multiple MP5048 devices can be used in parallel

for

high-current

applications.

The

current

balance loop in the MP5048 balances the start-

up current per active channel. All IMON pins

must be connected together.

The sensed currents from each active MP5048

IMON are summed together and divided by the

number

of

active

channels.

The resulting

average load current provides a measure of the

total load current.

The MP5048 current balance is achieved by

comparing the sensed current of CS pin in each

MP5048 to the average current, to make an

appropriate adjustment to the power FET gate

voltage of each Intelli-Fuse during start-up. The

equivalent average IMON resistor can be

calculated by RCS / N, where N is the number of

active MP5048 devices (see Figure 16).

MP5048

MP5048

MP5048

IMON

IMON

GND

CS

IMON

RCS

GND

CS

RCS

GND

CS

RCS

N

R

R

CS

IMON_AVG 

RIMON

RIMON

RIMON

RIMON = RCS

Figure 16: Multi-MP5048 IMON and CS

Connections in Parallel Application

The start-up current balance is essential in

achieving the thermal advantage of parallel

operation. With good current balance, the power

loss is dissipated equally over multiple devices

and a greater area.

MP5920 Controller and MP5048

The MP5048 can be combined with the MP5920

to provide PMBus telemetry, power sequencing,

and black box capabilities (see Figure 17).

MP5920

VIN

VOUT

VCC

CLREF

TEMP

SDA

SCL

ALERT#

VOSEN

GND

IMON

GOK

ON

VINSEN

MP5048

VIN

VOUT

ON

IMON

FAULT

VCC

CLREF

VTEMP

SS

GND

CS

TIMER

Pull up

3V

Intelli-Phase

TM

Pull up

TVS

EN

VDD3

ADDR

RESET

EN

LDO

3V

3.3V SYSTEM

POWER

Figure 17: MP5048 and MP5920 Operation

Using the internal 3V LDO, the MP5920 can be

powered directly by the MP5048, which allows

for power sequencing when only 48V is available.

The 3V LDO can be used as a bootstrap source

to power on the MP5920, but it cannot be used

for continuous operation. It is expected that a

3.3V source will power the MP5920 device after

initial start-up. The 3V LDO can be connected to

the main system 3.3V supply through a diode.

This disables current drawing from the internal

3V LDO, and uses the system

’s 3.3V to power

the MP5920.

Maximum Output Current

Figure 18 shows the case temperature rise vs.

the output current at different air conditions.

Figure 18: MP5048 Output Current vs.

Temperature Rise