MP5048

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

MP5048 Rev. 1.1

www.MonolithicPower.com

14

4/30/2021

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OPERATION

The

MP5048

is

a

monolithic,

integrated

controller and switch. It has a high-side MOSFET

(HS-FET) with 7m

Ω RDS(ON), which makes it ideal

for multi-fuse hot-swap or e-fuse applications.

The MP5048 can operate in standalone mode,

or

it

can

be

sequenced

with

the

MP5920/MP5922 controller. Multiple MP5048

devices can be used in parallel to support all

power levels required by the system. All devices

working in parallel actively share current during

soft start, which distributes the load current

evenly during soft start (SS) and ensures that

each part works in the thermal shutdown

operation area (TOA). The MP5048 supports

15A of continuous current per device at room

temperature.

The MP5048 provides a controlled start-up

voltage and limits the inrush current when a

circuit card is inserted into an active power

source. The MP5048 provides support for e-fuse

and hot-swap applications. It also provides an

integrated

solution

with

a

MOSFET,

temperature-sense, current monitoring, current

protection, temperature protection, and power

sequencing all in a single device. The MP5048

has integrated on-die current-sense to monitor

the current through the MP5048 and die

temperature, eliminating the need for an external

sense resistor and thermal sensing.

Power-Up Sequence

There are two operation modes for the MP5048:

it can be controlled by a hot-swap controller, or

act as a standalone device.

If the MP5048 is controlled by a hot-swap

controller, the power FET remains off until the

ON pin is pulled high.

The MP5048 has configurable settings for the

insertion delay, over-current protection (OCP)

time, and auto-retry time via a capacitor on the

TIMER pin. The insertion delay time starts when

VIN reaches the under-voltage lockout (UVLO)

threshold. When the ON signal goes high and

the insertion delay time ends, the power FET

charges up by the internal charge pump. Once

the MP5048 power FET voltage (VGS) reaches its

threshold (VGSTH), VOUT rises (see Figure 6).

VOUT rises following the soft-start controlled slew

rate, and the rise time is determined by the SS

capacitor.

During the soft-start turn-on time, the current

limit is reduced by an internal limit (called the SS

limit). Once soft start has completed, the current

limit moves to the full-scale current limit set by

the CLREF resistor.

t

VIN

FAULT

VOUT

VCC

MP5048 UVLO

ON

SS Limit

Insertion Delay

On Delay Determined

by Controller

VCLREF

VGS

VCLREF_NORM

VCS

Figure 6: Start-Up When MP5048 Is Controlled by

Hot-Swap Controller

The ON pin is low by default,

since it’s pulled low

to ground internally through a 1.1M

Ω resistor. If

the MP5048 works in standalone mode, ON

should be pulled up externally to the VCC (see

Figure 7).

MP5048

VIN

VOUT

ON

IMON

FAULT

SS

CLREF

VTEMP

VCC

GND

CS

TIMER

RCS

CSS

RIMON

VIN

RCLREF

3V

3V

VCC

Figure 7: MP5048 Schematic When Operating in

Standalone Mode