ST Life.augmented


LNB supply and control IC with step-up and I2C interface
  • active Active

Intended for analog and digital satellite receivers/Sat-TV and Sat-PC cards, the LNBH25 is a monolithic voltage regulator and interface IC, assembled in QFN24 4x4 specifically designed to provide the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna dish or to the multi-switch box. In this application field, it offers a complete solution with extremely low component count and low power dissipation together with a simple design and I²C standard interfacing.

pdf Please read
Errata Sheet
pdf Download

Key Features

  • Complete interface between LNB and I²C bus
  • Built-in DC-DC converter for single 12 V supply operation and high efficiency (typ. 93 % @ 0.5 A)
  • Selectable output current limit by external resistor
  • Compliant with main satellite receivers output voltage specification (15 programmable levels)
  • Accurate built-in 22 kHz tone generator suits widely accepted standards
  • 22 kHz tone waveform integrity guaranteed also at no load condition
  • Low-drop post regulator and high efficiency step-up PWM with integrated power N-MOS allowing low power losses
  • LPM function (low power mode) to reduce dissipation
  • Overload and overtemperature internal protections with I²C diagnostic bits
  • LNB short-circuit dynamic protection
  • +/- 4 kV ESD tolerant on output power pins

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS8729: LNB supply and control IC with step-up and I²C interface
4.0 1,050 KB

Application Notes

Description Version Size
AN4175: LNBH25 supply and control IC with step-up and I²C interface
2.1 1,784 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-CBL009V1 DiSEqC 1.X-compliant single LNB supply and control IC based on the LNBH25
STEVAL-CBL010V1 Single LNB supply and control IC DiSEqC 2.0 compliant based on LNBH25

Publications and Collaterals


Description Version Size
Peripheral semiconductors for set-top box applications
634 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
LNBH25PQRActiveQFN-24LTape And Reel_-.7Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.