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Antenna Tuning Circuit
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The ST BST capacitance controller STHVDAC-303 is a high voltage digital to analog converter (DAC), specifically designed to control and meet the wide tuning bias voltage requirement of the BST tunable capacitances.

It provides 3 independent high voltage outputs, thus having the capability to control 3 different capacitances in parallel. It is fully controlled through a 3-wire serial interface.

BST capacitances are tunable capacitances intended for use in mobile phone application, and dedicated to RF tunable applications. These tunable capacitances are controlled through a bias voltage ranging from 0 to 30 V. The implementation of BST tunable capacitance in mobile phones enables significant improvement in terms of radiated performance, making the performance almost insensitive to the external environment.

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Errata Sheet
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Key Features

  • Dedicated ASIC to control BST tunable capacitances
  • Operation compliant with cellular systems requirements
  • Integrated boost converter with 3 programmable outputs (from 0 to 30 V)
  • Low power consumption
  • 3-wire serial interface (30 or 32 bit SPI)
  • Available in WLCSP for stand-alone or SiP module integration
  • RF tunable passive implementation in mobile phones to optimize the radiated performances

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS7059: High voltage BST capacitance controller
4.0 281 KB

Application Notes

Description Version Size
AN4440: RFFE HVDAC control
1.0 1,547 KB

Technical Notes & Articles

Description Version Size
TN1173: Packing information for IPAD™, protection, rectifiers, thyristors and AC Switches
3.1 333 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) Order From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STHVDAC-303C6NRNDWLCSP 36Tape And Reel-.7No availability reported, please contact our Sales officeEcopack2PDF
STHVDAC-303F6ActiveWLCSP 36Tape And Reel-.966No availability reported, please contact our Sales officeEcopack2PDF
STHVDAC-303IC6NRNDWLCSP 36Tape And Reel-.7No availability reported, please contact our Sales officeEcopack2PDF

(*) 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.
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