Overview
The LNBH26LSPQR, produced by STMicroelectronics, is a dual Low Noise Block (LNB) supply and control IC designed for analog and digital dual satellite receivers, including STB satellite receivers, TV satellite receivers, and PC card satellite receivers. This monolithic voltage regulator and interface IC is assembled in a QFN24 (4x4 mm) package and provides a complete solution for dual tuner satellite receivers with a low component count, low power dissipation, and simple design using I²C standard interfacing.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC power supply input voltage | -0.3 to 20 | V |
| Output current (internally limited) | Up to 750 mA per channel | mA |
| Output voltage range | 8 programmable levels (13/18 V) | V |
| Efficiency (typical at 0.5 A) | 93% | % |
| Operating junction temperature range | -25 to 125 | °C |
| ESD rating (HBM) for power output pins | +/- 4 kV | kV |
| Package type | QFN24 (4x4 mm) |
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
- Accurate built-in 22 kHz tone generator
- Low-drop post regulator and high efficiency step-up PWM with integrated power NMOS
- 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 LNBH26LSPQR?
The LNBH26LSPQR is a dual LNB supply and control IC designed to provide the 13/18 V power supply and the 22 kHz tone signaling to the LNB down-converter in satellite receivers. - What is the package type of the LNBH26LSPQR?
The LNBH26LSPQR is packaged in a QFN24 (4x4 mm) package. - What is the efficiency of the built-in DC-DC converter?
The efficiency of the built-in DC-DC converter is typically 93% at 0.5 A. - How is the output voltage level programmed?
The output voltage level can be programmed using 4 + 4 bits of an internal DATA1 register accessible via the I²C bus. - What protection features does the LNBH26LSPQR have?
The LNBH26LSPQR has overload and overtemperature internal protection with I²C diagnostic bits and LNB short-circuit dynamic protection. - What is the ESD rating for the power output pins?
The ESD rating for the power output pins is +/- 4 kV. - How does the 22 kHz tone generator work?
The 22 kHz tone generator is built-in and can be controlled via the I²C bus or external signals, ensuring waveform integrity even at no load conditions. - What is the recommended total current from both sections to avoid overtemperature protection?
The recommended total current from both sections should not exceed 1 A to avoid triggering the overtemperature protection. - How is the I²C interface reset at power-on?
The I²C interface is automatically reset at power-on when the VCC rises above the undervoltage lockout threshold (4.8 V typ.). - What is the purpose of the DSQIN pin?
The DSQIN pin can be used for DiSEqC envelope input or external 22 kHz TTL input depending on the I²C bit settings.
