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STMicroelectronics LNBH26LPQR
- Part No.:
- LNBH26LPQR
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
LNBH26LPQR.pdf
- Description:
- IC REG CONV SAT TV 2OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,156
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Product details
Overview
LNBH26LPQR from STMicroelectronics is a dual-channel LNB supply and control IC for satellite receiver front-ends, integrating step-up DC-DC converters (93% typ. efficiency @ 0.5 A), dual low-drop linear regulators (13/18 V programmable outputs), and I²C-controlled 22 kHz tone generation compliant with DiSEqC standards. It delivers independent 13 V / 18 V power and signaling to two LNBs in STB, TV, or PC-card satellite receivers using a single 8–16 V input.
For engineers reviewing the LNBH26LPQR datasheet, LNBH26LPQR pinout, LNBH26LPQR application, or LNBH26LPQR equivalent, key selection criteria include dual-channel current limit configuration via ISEL resistor, 8-level programmable output voltage per channel, integrated DiSEqC envelope/tone control on DSQIN pins, and real-time I²C diagnostic bits for overload, overtemperature, and input undervoltage conditions.
Technical Context
The LNBH26LPQR implements two independent power channels (A/B), each comprising a high-efficiency PWM step-up converter (LX-A/LX-B) feeding a precision low-drop linear regulator (VOUT-A/VOUT-B). The internal 22 kHz tone generator supports three activation modes-continuous I²C control, external TTL signal on DSQIN, or DiSEqC envelope modulation-with guaranteed waveform integrity even at no load.
Protection logic is fully observable via I²C status registers: OLF-A/B bits flag overcurrent events with configurable pulsed or static limiting (TON=90 ms, TOFF=900 ms), OTF detects junction temperature >150 °C, and PNG triggers below VCC = 4.7 V. All protections latch until cleared by register read and user-defined recovery policy (OLR/THERM bits).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Input Range | 8 V to 16 V DC - enables direct use of standard STB power rails without pre-regulation. |
| Output Voltage Levels | 8 programmable levels per channel (13/18 V nominal) - matches global satellite LNB requirements including universal and regional standards. |
| Max Output Current | 750 mA per channel, ≤1 A total (A+B) - ensures thermal stability while supporting dual-LNB loads with margin. |
| Step-up Efficiency | 93% typical @ 0.5 A - minimizes heat dissipation in compact QFN24 packages and reduces system cooling needs. |
| Tone Accuracy | 22 kHz ±0.5% - factory-trimmed to meet DiSEqC 1.x timing and spectral mask compliance. |
| ESD Rating | ±4 kV HBM on VOUT pins - provides robustness against antenna-cable transient surges without external TVS. |
| Diagnostic Interface | I²C-compatible (SDA/SCL), 7-bit address with ADDR pin select - enables real-time fault monitoring and dynamic reconfiguration in embedded host firmware. |
Pinout & Package
Package: QFN24 (4 mm × 4 mm, 0.5 mm pitch) with exposed thermal pad (Epad) connected to GND for efficient heat dissipation (RthJC = 2 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT-A / VOUT-B | Dual LNB output ports | Deliver regulated 13/18 V DC + superimposed 22 kHz tone to separate LNBs; support up to 750 mA each. |
| DSQIN-A / DSQIN-B | DiSEqC tone control inputs | Accept TTL 22 kHz signals or DiSEqC envelope codes per channel; enable flexible host-side tone management. |
| LX-A / LX-B | Integrated N-MOS drain nodes | Switching nodes for internal step-up converters; require external inductors and diodes for boost operation. |
| ISEL | Current limit programming input | Resistor-to-GND sets identical max current threshold for both channels (e.g., 100 kΩ → 500 mA typ.). |
| VUP-A / VUP-B | Step-up output / LDO input | Intermediate rail (≥14 V) supplied to linear regulators; dropout minimized to ~1 V for high efficiency. |
| SDA / SCL | I²C bidirectional interface | Enable full register access for voltage selection, tone control, protection configuration, and status readback. |
| GND / PGND / Epad | Analog, power, and thermal ground | Separate analog/power grounds reduce noise coupling; Epad must be soldered to PCB ground plane with vias. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LNB channels | Full electrical isolation between A/B sections allows simultaneous operation with different voltages, currents, and tone states. |
| Programmable 22 kHz tone | Factory-calibrated frequency with <1 µs activation delay and guaranteed waveform fidelity under all load conditions. |
| Dynamic short-circuit protection | Pulsed current limiting (90 ms ON / 900 ms OFF cycle) reduces average power dissipation during faults by >90% vs. static clamp. |
| I²C diagnostic visibility | Four dedicated status bits (OLF-A, OLF-B, OTF, PNG) provide immediate root-cause identification without oscilloscope probing. |
| Low-drop linear regulation | 1 V typical dropout enables high efficiency even at 18 V output from 16 V input, minimizing thermal stress on QFN package. |
Applications
| STB Satellite Receiver | TV Satellite Receiver |
|---|---|
|
Use Scenario: Dual-tuner set-top box requiring independent 13/18 V power and DiSEqC switching for two satellite dishes. IC Role / Device Role / Timing Role: Primary LNB power manager and tone generator; handles I²C commands from main MCU to configure voltage, tone, and diagnostics per tuner. Use Value: Eliminates discrete DC-DC + LDO + tone circuitry, reducing BOM count by ≥12 components and PCB area by 35%. |
Use Scenario: Integrated satellite TV receiver with picture-in-picture and multi-source switching capability. IC Role / Device Role / Timing Role: Dual-channel LNB interface IC providing synchronized 22 kHz tone bursts and voltage switching for DiSEqC 1.0/1.1 command execution. Use Value: Enables sub-100 µs tone edge timing accuracy required for reliable DiSEqC envelope detection in noisy RF environments. |
| PC Card Satellite Receiver | Multi-Switch Distribution System |
|
Use Scenario: Low-profile PCIe/ExpressCard satellite tuner card with strict thermal and space constraints. IC Role / Device Role / Timing Role: Compact dual-LNB controller delivering regulated power and tone through miniaturized QFN24 package with Epad thermal path. Use Value: Achieves 1.2 W max power dissipation at full 1 A load, enabling passive cooling in fanless card designs. |
Use Scenario: Residential multi-switch box powering up to 4 LNBs from a single dish array with polarity/voltage selection. IC Role / Device Role / Timing Role: Dual-channel LNB driver IC used in parallel configurations to drive multiple switch inputs with coordinated tone and voltage control. Use Value: Supports simultaneous tone injection on both channels for fast DiSEqC positioner control without inter-channel crosstalk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LNB supply and control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2181AETL+ | Single-channel only; requires external 22 kHz oscillator; no integrated step-up converter (needs 24 V input). | Suitable for cost-sensitive single-tuner designs where board space permits discrete boost stage. | Select when system already provides 24 V rail and dual-channel operation is not required. |
| LMX2594RHBR | RF synthesizer with no LNB power delivery; lacks linear regulators, tone generation, and DiSEqC interface. | Not functionally equivalent - intended for local oscillator synthesis, not LNB biasing or control. | Exclude from LNB supply replacement evaluation; serves entirely different signal-generation role. |
Compared with MAX2181AETL+, LNBH26LPQR integrates step-up conversion and dual-channel control, eliminating external power stages and reducing design complexity for multi-tuner systems; unlike LMX2594RHBR, it delivers complete LNB interface functionality rather than RF synthesis alone.
Availability
LNBH26LPQR is available at Aetrix Electronics and suitable for STB satellite receivers, TV satellite receivers, and PC card satellite receivers requiring stable component supply, long-term lifecycle support, and traceable sourcing for broadcast equipment manufacturing.
Supply support for LNBH26LPQR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader specializing in power management, analog, and automotive ICs, with broad portfolio coverage across consumer, industrial, and communications markets.
The LNBH26LPQR belongs to ST's satellite receiver interface product line, designed specifically to consolidate LNB power, tone generation, and DiSEqC control into a single monolithic solution for dual-tuner digital satellite reception systems.
FAQ
What is the maximum allowable total output current for continuous operation?
The LNBH26LPQR supports up to 750 mA per channel, but continuous operation must limit combined current (IOUT-A + IOUT-B) to ≤1 A to prevent triggering overtemperature protection. This constraint arises from thermal limits of the QFN24 package and PCB layout; exceeding 1 A total requires validated thermal vias and copper pour per ST's AN4273 guidelines.
How does the DSQIN pin support both DiSEqC envelope and external 22 kHz TTL inputs?
DSQIN-A and DSQIN-B accept either DiSEqC envelope signals (EXTM=0, TEN=1) or external 22 kHz TTL waveforms (EXTM=1, TEN=1), with mode selected via I²C register bits. Internal logic synchronizes tone activation to DSQIN edges: envelope mode triggers tone within 6 µs of rising edge; TTL mode activates tone within 1 µs and deactivates within 60 µs after signal ends.
Can the output voltage be changed dynamically during operation?
Yes - output voltage per channel is controlled by 4-bit fields in the DATA1 register, accessible in real time via I²C write operations. Voltage changes take effect immediately upon register update, with soft-start behavior (4 ms to 13 V, 6 ms to 18 V) preventing output overshoot or inrush current spikes.
What happens when overtemperature protection activates?
When junction temperature exceeds 150 °C, the step-up converters and both linear regulators shut down, and the OTF bit in STATUS1 is latched HIGH. Recovery depends on the THERM bit: if THERM=0, outputs auto-resume when temperature falls below threshold; if THERM=1, VSEL bits reset to zero and require MCU reprogramming to restore output.
LNBH26LPQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, Analog and Digital Satellite STB Receivers/SatTV
- Voltage - Input:
- 8V ~ 16V
- Number of Outputs:
- 2
- Voltage - Output:
- 13V, 18.15V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LNBH26LPQR FAQ
1.How can I place an order for LNBH26LPQR through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH26LPQR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LNBH26LPQR reliable?
The price and inventory of LNBH26LPQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH26LPQR is usually 5 days.
3.What payment methods are accepted for LNBH26LPQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH26LPQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH26LPQR?
LNBH26LPQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH26LPQR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LNBH26LPQR?
For technical support, including LNBH26LPQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH26LPQR requirements.
6.How does Aetrix verify that LNBH26LPQR is sourced from the original manufacturer or authorized distributors?
All LNBH26LPQR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LNBH26LPQR meets industry standards.
7.What is the process for return or replacement of LNBH26LPQR?
All LNBH26LPQR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH26LPQR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LNBH26LPQR part is unused and in its original packaging.
Return procedure for LNBH26LPQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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