ST Life.augmented


High voltage BST capacitance controller

The ST high voltage BST capacitance controller STHVDAC-304MF3 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 capacitors.

It provides 4 independent high voltage outputs, thus having the capability to control 4 different capacitances in parallel. It is fully controlled through an RFFE serial interface.

BST capacitors are tunable capacitors intended for use in mobile phone applications, and dedicated to RF tunable applications. These tunable capacitors are controlled through a bias voltage ranging from 2 to 16 V. The implementation of BST tunable capacitors in mobile phones enables significant improvement in term of radiated performance, making the performance almost insensitive to the external environment.

pdf Please read
Errata Sheet
pdf Download

Key Features

  • Dedicated ASIC to control BST tunable capacitances
  • Operation compliant with cellular systems requirements
  • Integrated boost converter with 4 programmable outputs (from 0 to 30 V)
  • Low power consumption
  • MIPI RFFE serial interface 1.8 V
  • Available in WLCSP for stand-alone or SiP module integration
  • Benefits
  • RF tunable passive implementation in mobile phones to optimize the radiated performance

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS8994: High voltage BST capacitance controller
3.0 344 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$)*
@ 50
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STHVDAC-304MC3NRNDFlip-Chip 400uTape And Reel-.65No availability reported, please contact our Sales officeEcopack2PDF
STHVDAC-304MF3NRNDFlip-Chip 400uTape And Reel-.65No 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.