Overview
The LNBH23LQTR, produced by STMicroelectronics, is a monolithic voltage regulator and interface IC specifically designed for analog and digital satellite receivers. It is assembled in a QFN32 5 x 5 package and provides a complete solution for LNB (Low Noise Blocker) power supply and control. The IC offers a low component count, low power dissipation, and simple design with I²C standard interfacing. It is capable of providing the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna dish or to the multi-switch box.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | 32-QFN (5x5) Exposed Pad |
| Input Voltage Range | 8 V to 15 V |
| Output Voltage | Selectable between 13.4 V and 18.4 V |
| Operating Temperature | 0°C to 85°C |
| Mounting Type | Surface Mount |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
| Efficiency | Typically 93% @ 0.5 A |
| 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
- Auxiliary modulation input (EXTM pin) facilitates DiSEqC™ 1.X encoding
- Accurate built-in 22 kHz tone generator
- Low-drop post regulator and high efficiency step-up PWM with integrated power NMOS
- Overload and over-temperature internal protections with I²C diagnostic bits
- LNB short circuit dynamic protection
- ± 4 kV ESD tolerant on output power pins
Applications
- Satellite Set-Top Box (STB) receivers
- TV satellite receivers
- PC card satellite receivers
- Analog and digital satellite receivers
Q & A
- What is the primary function of the LNBH23LQTR IC?
The LNBH23LQTR 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 satellite receivers.
- What is the input voltage range for the LNBH23LQTR?
The input voltage range is from 8 V to 15 V.
- How is the output voltage selected on the LNBH23LQTR?
The output voltage can be selected between 13.4 V and 18.4 V using the VSEL bit via the I²C interface.
- What is the efficiency of the DC-DC converter in the LNBH23LQTR?
The DC-DC converter has a typical efficiency of 93% at 0.5 A.
- Does the LNBH23LQTR have built-in protection features?
Yes, it includes overload, over-temperature, and short circuit dynamic protection with I²C diagnostic bits.
- What is the purpose of the EXTM pin on the LNBH23LQTR?
The EXTM pin facilitates DiSEqC™ 1.X encoding by allowing an external 22 kHz signal to be superimposed on the VoRX output.
- How is the 22 kHz tone generator controlled in the LNBH23LQTR?
The 22 kHz tone generator can be controlled through the TTX pin or by the TTX bit via the I²C interface.
- What is the operating temperature range of the LNBH23LQTR?
The operating temperature range is from 0°C to 85°C.
- Is the LNBH23LQTR RoHS compliant?
Yes, the LNBH23LQTR is lead-free and RoHS compliant.
- What type of package does the LNBH23LQTR come in?
The LNBH23LQTR comes in a 32-QFN (5x5) Exposed Pad package.
