MP8124

500mA LNB Power Supply

and Control Regulator

MP8124 Rev. 1.0

www.MonolithicPower.com

1

11/11/2015

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

© 2015 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP8124 is a highly integrated voltage

regulator designed to provide efficient, low-

noise power and interface signals to the low-

noise block (LNB) of a satellite receiver. It

provides a 22kHz tone signal output, which is

compatible with DiSEqC 1.x.

The MP8124 integrates a current-mode boost

regulator followed by a tracking linear regulator.

Also, it has output voltage selection and a

22kHz tone shaper from an external signal.

The boost regulator provides a clean power

source, which is 1V higher than the final output

voltage while the tracking linear regulator

protects the output against overloads and

shorts.

Full protection features include over-current

protection (OCP), short-circuit protection (SCP),

boost over-voltage protection (OVP), and over-

temperature protection (OTP), offering a simple

solution with a low component count and high

efficiency.

The MP8124 is available in a 14-pin QFN

(2mmx3mm) package.

FEATURES

• Compatible with DiSEqC 1.x

• 600mA Accurate Current Limit

• 8V to 14V Input Voltage

• Low-Noise LDO Output

• High Efficiency at Light Load: >85% at a

40mA Load

• High Frequency for Small Component Sizes

• Built-In 22kHz Signal Shaper

• Selectable Output Voltage

• Over-Current Protection (OCP) Short-Circuit

Protection (SCP)

• Boost Over-Voltage Protection (OVP)

• Over-Temperature Protection (OTP)

• Available

in

a

QFN-14

(2mmx3mm)

Package

APPLICATIONS

• LNB Power Supply and Control for Satellite

Set-Top Boxes

• TV Satellite Receivers

• PC Card Satellite Receivers

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.

TYPICAL APPLICATION

VDD

VBOOST

BST

AGND

SW

VOUT

PGND

LINEDROP

EN

EXTM

C1

C2

L1

D1

C3

C4

VIN

8V -14V

Vout

13V/18V

COMP

R1

C7

BYPASS

C5

TCAP

C6