MP8764

High Efficiency, 12A, 18V

Synchronous Step-Down Converter

with Latch-off OCP

MP8764 Rev. 1.2

www.MonolithicPower.com

1

6/21/2016

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

© 2016 MPS. All Rights Reserved.

The

Future

of

Analog

IC

T

echnology

DESCRIPTION

The MP8764 is a fully integrated high frequency

synchronous rectified step-down switch mode

converter. It offers a very compact solution to

achieve 12A output current over a wide input

supply range with excellent load and line

regulation. The MP8764 operates at high

efficiency over a wide output current load range.

The MP8764 adopts Constant-On-Time (COT)

control

mode

that

provides

fast

transient

response and eases loop stabilization.

Operation frequency can be programmed easily

from 200kHz to 1MHz by an external resistor

and keeps nearly constant as input supply

varies by the feedforward compensation.

VCC under voltage lockout is internally set at

3.9V, but can be increased by programming the

threshold with a resistor network on the enable

pin.

The

output

voltage

startup

ramp

is

controlled by the soft start pin. An open drain

power good signal indicates the output is within

its nominal voltage range.

Full integrated protection features include OCP,

OVP and thermal shutdown.

The MP8764 requires a minimum number of

readily available standard external components

and are available in QFN 3X4 package.

FEATURES

•

2.5V to 18V Operating Input Range with

External 5V Bias

•

4.5V to 18V Operating Input Range with

Internal Bias

•

12A Output Current

•

•

Proprietary Switching Loss Reduction

Technique

•

Adaptive COT for Ultrafast Transient

Response

•

1.5% Reference Voltage Over

-40°C

to

+125°C Junction Temperature Range

•

Programmable Soft Start Time

•

Pre-Bias Start up

•

Programmable Switching Frequency from

200kHz to 1MHz

•

OVP, latch-off SCP, Protection and Thermal

Shutdown

•

Output Adjustable from 0.611V to 13V

APPLICATIONS

•

Set-top Boxes

•

XDSL Modem/DSLAM

•

Small-cell Base Stations

•

Personal Video Recorders

•

Flat Panel Television and Monitors

•

Distributed Power Systems

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

MPS green status, please visit MPS website under Quality Assurance. “MPS”

and “The Future of Analog IC Technology” are Registered Trademarks of

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

IN

FR EQ

VC C

EN

PGND

BST

FB

SW

M P8764

V

IN

ON /OFF

C1

R

FR EQ

C5

C3

L1

R4

C4

R1

R2

C2

R3

PG

AGND

SS

V

OUT

C6