MP8126

550mA, 8V-to-14V Input, LNB-Power Supply

and Control-Voltage Regulator

MP8126 Rev. 1.03

www.MonolithicPower.com

1

5/27/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP8126 is a voltage regulator designed to

provide efficient, low-noise power to a satellite

receiver’s RF LNB (Low Noise Block) converter.

It connects using a coaxial cable through a link

that

is

compatible

with

the

European

EUTELSAT specification (DiSEqC) 1.x that

receives instructions from a dedicated controller.

The MP8126 integrates a current-mode boost

regulator followed by a tracking linear regulator.

The boost regulator provides a clean and quiet

power source that will not contaminate the low-

noise RF signal as it is down-converted to the

receiver. The tracking linear regulator protects

the output against overloads or shorts.

The MP8126 provides a number of features

described in the DiSEqC, including voltage

selection

of

horizontal

or

vertical

LNB

polarization directions, and selectable VOUT

compensation for substantial voltage drops on

long coaxial cable. In accordance with DiSEqC,

the part can detect a 22kHz signal and output a

shaped signal.

The MP8126 is available in a thermally-

enhanced

TSSOP16EP

and

24-pin

QFN

(4X4mm) packages.

FEATURES

• DiSEqC 1.x Compatibility

• Up to 550mA Output Current

• Programmable Current Limit

• 8V-to-14V Input Voltage

• Boost Converter with Internal Switch

• Low-Noise LDO Output

• Built-In 22kHz Signal Shaper

• 1V Line-Drop Compensator

• Adjustable Soft-Start Time

• POK Indicator

• Short-Circuit Protection

• Over-Temperature Protection

• TSSOP16 Exposed Pad and 24-pin QFN

(4X4mm) Packages

APPLICATIONS

• LNB Power Supply and Control for Satellite

Set Top Boxes

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

status, please visit the MPS website under Products, Quality Assurance.

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION