STMicroelectronics LNBH26S Dual LNBS Supply and Control IC
STMicroelectronics LNBH26S Dual LNBS Supply and Control IC is a monolithic voltage regulator and interface IC housed in a QFN-24 4x4mm package. The LNBH26S is intended for analog and digital dual satellite receivers/Sat-TV, and Sat-PC cards.
The IC provides the 13/18V power supply and 22kHz tone signaling to the LNB down-converter in the antenna dishes or to the multiswitch box. The LNBH26S is a complete solution for dual tuner satellite receivers with extremely low component count, low power dissipation and I²C standard interfacing.
Features
- Complete interface between LNB and I²C bus
- Built-in DC-DC converter for single 12V supply operation and high efficiency (typ. 93% @ 0.5A)
- Selectable output current limit by external resistor
- Compliant with main satellite receiver output voltage specification (15 programmable levels)
- Accurate built-in 22kHz tone generator suits widely accepted standards
- 22kHz tone waveform integrity guaranteed at no-load condition as well
- Low drop post regulator and high efficiency step-up PWM with integrated power NMOS allowing low power losses
- LPM function (low power mode) to reduce dissipation
- Overload and overtemperature internal protection with I²C diagnostic bits
- LNB short-circuit dynamic protection
- +/- 4kV ESD tolerant on output power pins
Applications
- STB satellite receivers
- TV satellite receivers
- PC card satellite receivers
Evaluation Board
STMicroelectronics STEVAL-LNBH05 Evaluation Board
Implements a DC-DC converter based on the LNBH26S device.
Block Diagram
Published: 2016-10-18
| Updated: 2022-03-11