What this part does in a satellite receiver
The STMicroelectronics LNBH23LQTR is a single-output voltage regulator/converter IC designed specifically for analog and digital satellite set-top box receivers and SatTV applications. It takes an input supply of 8V to 15V and delivers a regulated output of either 13.4V or 18.4V—the two standard LNB supply voltages used to select polarisation and band in satellite downconverter modules. Packaged in a 32-VFQFN with exposed pad (5x5 mm), it is a surface-mount part meant for compact, high-density receiver boards.
Output voltage selection — 13.4V or 18.4V
The dual output levels match the DiSEqC control standard: 13.4V for vertical polarisation and 18.4V for horizontal, with the 22 kHz tone signalling high-band selection. If you are repairing or building a satellite STB, this part handles the LNB supply directly, so you do not need an external boost converter or a separate switching stage. The single-output design means one LNBH23LQTR drives one LNB; for multi-LNB systems you would use one per feed.
The 32-VFQFN exposed pad (32-QFN 5x5 mm) is the standard footprint for this class of LNB supply IC.