Overview
The LNBH26PQR, produced by STMicroelectronics, is a monolithic voltage regulator and interface IC designed specifically for analog and digital dual satellite receivers, Sat-TV, and Sat-PC cards. This IC provides a complete solution for dual tuner satellite receivers with a low component count, low power dissipation, and simple design using I²C standard interfacing. It is assembled in a QFN24 (4x4 mm) package and is intended to supply the 13/18 V power and the 22 kHz tone signalling to the LNB down-converter in antenna dishes or multi-switch boxes.
Key Specifications
| Parameter | Description |
|---|---|
| Package | QFN24 (4x4 mm) |
| Supply Voltage Range | 8 V to 16 V |
| Output Voltage Levels | 15 programmable levels (13 V / 18 V) |
| Output Current Limit | Up to 1 A per channel (total current from both sections < 1 A) |
| Efficiency | Typical 93% @ 0.5 A |
| 22 kHz Tone Generator | Accurate built-in tone generator with guaranteed waveform integrity |
| Low Power Mode (LPM) | Reduces power dissipation when 22 kHz tone is disabled |
| Protection Features | Overload, overtemperature, and short-circuit dynamic protection |
| ESD Tolerance | +/- 4 kV on output power pins |
Key Features
- Complete interface between LNB and I²C bus
- Built-in DC-DC converter for single 12 V supply operation with high efficiency
- 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
- Low drop post regulator and high efficiency step-up PWM with integrated power N-MOS
- Low power mode (LPM) to reduce dissipation
- Overload and overtemperature internal protection with I²C diagnostic bits
- LNB short-circuit dynamic protection
- +/- 4 kV ESD tolerant on output power pins
Applications
- STB satellite receivers
- TV satellite receivers
- PC card satellite receivers
Q & A
- What is the primary function of the LNBH26PQR IC?
The LNBH26PQR is a monolithic voltage regulator and interface IC designed to provide the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in antenna dishes or multi-switch boxes.
- What is the package type and size of the LNBH26PQR?
The LNBH26PQR is assembled in a QFN24 (4x4 mm) package.
- What is the supply voltage range for the LNBH26PQR?
The supply voltage range is from 8 V to 16 V.
- How many programmable output voltage levels does the LNBH26PQR support?
The LNBH26PQR supports 15 programmable output voltage levels.
- What is the typical efficiency of the DC-DC converter in the LNBH26PQR?
The typical efficiency is 93% at 0.5 A.
- Does the LNBH26PQR have built-in protection features?
- How does the LNBH26PQR handle 22 kHz tone generation?
The LNBH26PQR has an accurate built-in 22 kHz tone generator with guaranteed waveform integrity.
- What is the purpose of the Low Power Mode (LPM) in the LNBH26PQR?
The LPM reduces power dissipation when the 22 kHz tone is disabled.
- What is the ESD tolerance of the LNBH26PQR on its output power pins?
The ESD tolerance is +/- 4 kV on output power pins.
- How can the output current limit be set in the LNBH26PQR?
The output current limit can be set by an external resistor connected to the ISEL pin.
