MP9459

17V, 4A, 600kHz, High-Efficiency,

Synchronous, Step-Down Converter

in an SOT563 Package

MP9459 Rev. 1.0

www.MonolithicPower.com

1

1/13/2020

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2020 MPS. All Rights Reserved.

DESCRIPTION

The

MP9459

is

a

fully

integrated,

high-

frequency, synchronous, rectified, step-down,

switch-mode converter

with

internal

power

MOSFETs. The device is a compact solution

that achieves 4A of output current over a wide

input

range

with

excellent

load

and

line

regulation. It uses synchronous mode operation

for higher efficiency over the output current load

range.

Constant-on-time

(COT)

control

operation

provides very fast transient response, easy loop

design, and very tight output regulation.

Full protection features include short-circuit

protection (SCP), over-current protection (OCP),

under-voltage protection (UVP), and thermal

shutdown.

The MP9459 requires a minimal number of

readily

available,

standard

external

components. It is available in a space-saving

SOT563

(1.6mmх1.6mm) package.

FEATURES

 Wide 4.2V to 17V Operating Input Range

 60mΩ/30mΩ Low R

DS(ON) Internal Power

MOSFETs

 200µA Low Quiescent Current

 High-Efficiency Synchronous Mode

Operation

 Power-Save Mode at Light Load

 Fast Load Transient Response

 600kHz Switching Frequency

 Internal Soft Start (SS)

 Over-Current Protection (OCP) and Hiccup

Mode

 Thermal Shutdown

 Output Adjustable from 0.8V

 Available in an SOT563 (1.6mmх1.6mm)

Package

APPLICATIONS

 Security Cameras

 Digital Set-Top Boxes

 Flat-Panel Televisions and Monitors

 General Purpose

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,” the MPS logo, and “Simple, Easy Solutions” are

registered trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

TYPICAL APPLICATION

MP9459

VIN

EN

VIN

FB

BST

VOUT

SW

GND

12V

C1

22

μF

C3

1

μF

L1

2.2

μH

C2

22

μF x 2

R1

40.2k

Ω

R2

13k

Ω

EN

3.3V/4A

R3

75k

Ω

R4

10

Ω