MP5403B

Mini PMIC with Dual 4A/5A Peak Bucks,

One 2A Load Switch, and

Input Power Supervisory

MP5403B Rev. 1.0

www.MonolithicPower.com

1

12/5/2017

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© 2017 MPS. All Rights Reserved.



DESCRIPTION

The

MP5403B

is

a

monolithic

power

management unit containing two high-efficiency,

step-down, switching converters and a load

switch. The two regulators supply peak currents

up to 5A and 4A separately, and the load switch

supplies up to 3A of load current with an

to 6V, the MP5403B is ideal for powering ASIC

and SOC for solid-state drives (SSD) and other

compact power systems.

The peak-current-mode control scheme with

pulse-skip mode operation provides the two

switchers with fast transient response, high light-

load efficiency, and a minimal number of

capacitors by using an interleaving PWM clock

between the two switchers. The 3A load switch

with a low 20

mΩ on resistance provides flexible

system configuration.

A full set of enable control pins and power good

open-drain

indicators

allow

for

easy

implementation of the start-up and shutdown

sequences.

Full protection features include over-current

protection (OCP) and thermal shutdown.

The MP5403B requires a minimal number of

readily available, standard, external components

and

is

available

in

a

small

UTQFN-20

(2.5mmx3mm) package.

FEATURES

 Up to 6V Operating Input Range

 Low I

 Two Buck Converters

o

Peak 5A with 55

o

Peak 4A with 65

o

1.5MHz Switching Frequency

o

180° Interleaving Operation

o

100% Duty Cycle

o

Load Switch Mode by Pulling FB Low

o

Latch-Off Short-Circuit Protection (SCP)

o

Internal Soft Start (SS) and Output

Discharge

o

Optimized Light-Load Efficiency

 One Load Switch with 20mΩ R

DS(ON)

o

3A with 20

o

Soft Start (SS) and Output Discharge

o

Over-Current Protection (OCP)

 EN and Power Good (PG) for Power

Sequencing

 Input Power Good (PG) Indicator with

Adjustable Threshold and Delay

 Thermal Shutdown

 Available in a UTQFN-20 (2.5mmx3mm)

Package

APPLICATIONS

 Solid-State Drives (SSD)

 Portable Instruments

 Battery-Powered Devices

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.

For MPS green status, please visit the MPS website under Quality

Assurance.

“MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.