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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Special Purpose Regulators

STMicroelectronics LNBH26SPQR

Name: LNBH26SPQR
Brand: STMicroelectronics
SKU: LNBH26SPQR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LNBH26SPQR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 24-VFQFN Exposed Pad

Datasheet:: LNBH26SPQR.pdf

Description:: IC REG CONV SAT TV 2OUT 24QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LNBH26SPQR from STMicroelectronics is a dual-channel LNB power supply and DiSEqC™ interface IC for satellite receiver systems. It integrates two independent 13/18 V linear regulators with programmable output voltage (15 levels), built-in 22 kHz tone generation compliant with DiSEqC™ standards, and high-efficiency step-up DC-DC converters (93% typ. @ 0.5 A) operating from 8–16 V input. Used in STB, TV, and PC-card satellite receivers to power and control LNBs on antenna dishes or multi-switch boxes.

For engineers reviewing the LNBH26SPQR datasheet, LNBH26SPQR pinout, LNBH26SPQR application, or LNBH26SPQR equivalent, this device supports I²C-controlled dual-channel LNB supply with real-time diagnostics (OTF, OLF, VMON, TMON), dynamic short-circuit protection, low-power mode (LPM), and bi-directional DiSEqC™ 2.0 signaling via DETIN/DSQOUT pins - critical for tuner selection, polarization switching, and multi-LNB control in modern satellite front-ends.

Technical Context

The LNBH26SPQR implements two fully independent power channels (A/B), each with a high-efficiency PWM step-up converter (LX-A/LX-B), integrated NMOS power switch, and ultra-low-drop linear post-regulator (VOUT-A/VOUT-B). The internal 22 kHz tone generator is factory-trimmed per DiSEqC™ spec and supports three activation modes: I²C-controlled continuous tone, external TTL envelope-triggered tone, or external 22 kHz waveform injection via DSQIN.

Diagnostic functions are exposed via two I²C STATUS registers (14 bits total), covering overload (OLF), overtemperature (OTF), input undervoltage (PNG), output voltage monitoring (VMON), tone integrity (TMON), tone detection (TDET), minimum load current (IMON), and external voltage presence (PDO). Fault conditions drive the open-drain FLT pin low and latch diagnostic bits until cleared by register read.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Input Range	8 V to 16 V - enables direct use of standard satellite receiver 12 V rail with ±25% tolerance for automotive or unstable PSU environments.
Output Voltage Programmability	15 discrete levels (13 V / 18 V primary) - set via I²C DATA1 register to match regional LNB requirements (e.g., vertical/horizontal polarization, band selection).
22 kHz Tone Accuracy	±1.5% frequency tolerance - ensures reliable DiSEqC™ command recognition across all LNBs without external calibration.
Efficiency (Step-up)	93% typ. @ 0.5 A - minimizes thermal load in compact STB enclosures and reduces need for heatsinking or forced airflow.
LDO Dropout Voltage	1.0 V typ. (normal mode), 0.6 V typ. (LPM mode) - directly determines power dissipation: 0.5 W @ 500 mA (LPM off), 0.3 W @ 500 mA (LPM on).
Current Limit Range	Programmable up to 1 A per channel via external R_SEL resistor - allows precise matching to LNB quiescent and surge current profiles.
Thermal Shutdown Threshold	150 °C typ. - protects silicon during sustained overload or poor PCB thermal design; auto-recovery configurable via THERM bit.

Pinout & Package

Package: QFN24 (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced with exposed power ground pad (Pin 4 = PGND).

Pin/Terminal	Circuit Role	Design Meaning
DSQOUT-A / DSQOUT-B	DiSEqC™ data output (open-drain)	Delivers decoded DiSEqC™ response pulses from DETIN-A/B to host MCU - enables full bi-directional DiSEqC™ 2.0 communication without external logic.
DETIN-A / DETIN-B	AC-coupled DiSEqC™ input	Receives incoming DiSEqC™ reply signals from LNB; internal tone detector triggers TDET bit when 22 kHz present - essential for feedback-based command validation.
VOUT-A / VOUT-B	Dual LNB power outputs	Deliver regulated 13/18 V to LNBs; include integrated post-regulator, current sensing, and VMON/TMON diagnostics - eliminates need for external LDOs or sense resistors.
LX-A / LX-B	Integrated NMOS drain nodes	Connect to external boost inductors; integrate 4 A (ISW=0) or 2.5 A (ISW=1) switching current limit - defines inductor saturation margin and transient response capability.
FLT	Fault flag (open-drain)	Asserts low on OLF/OTF/PNG - provides immediate hardware interrupt to MCU for fail-safe shutdown or user alert without polling I²C registers.
ISEL	Current limit programming	Accepts external resistor to GND to set identical IMAX for both channels - enables single-point tuning of short-circuit robustness across dual-tuner designs.

Key Features

Feature	Design Value
Independent dual-channel architecture	Full electrical and control isolation between A/B sections (except I²C, VCC, ISEL) - enables simultaneous operation of two physically separate LNBs or multi-switch inputs without crosstalk.
Dynamic short-circuit protection (PCL)	Configurable pulsed current limiting (TON = 90/180 ms, TOFF = 900 ms) - reduces average power dissipation during sustained shorts by >70% vs. static clamp, preserving reliability in cable fault scenarios.
Low-power mode (LPM)	Reduces LDO dropout from 1.0 V to 0.6 V when 22 kHz disabled - cuts quiescent dissipation by 40% at 500 mA, critical for fanless STB thermal budgets.
I²C-accessible diagnostics	14-bit status reporting (2 registers) including VMON, TMON, IMON, PDO - enables real-time health monitoring and predictive maintenance without additional analog circuitry.
BPSW-A / BPSW-B	External transistor control for RL filter bypass	Enables clean 22 kHz transmission in DiSEqC™ 2.x by disabling output filter during tone burst - prevents waveform distortion while maintaining EMI filtering during DC supply.

Applications

STB Satellite Receiver

TV Satellite Receiver

Use Scenario: Dual-tuner set-top box selecting between two orbital positions (e.g., Astra 19.2°E and Hotbird 13°E) using DiSEqC™ 1.2 commands.

IC Role / Device Role: Provides independent 13/18 V bias and 22 kHz tone to each LNB; decodes DiSEqC™ replies via DETIN/DSQOUT for closed-loop command verification.

Use Value: Eliminates discrete DC-DC + LDO + tone generator + DiSEqC™ transceiver solution - reduces BOM count by ≥12 components and PCB area by 35%.

Use Scenario: Integrated satellite TV receiver supporting universal LNBs with automatic polarization (H/V) and band (low/high) switching.

IC Role / Device Role: Generates precise 13 V (vertical) or 18 V (horizontal) under I²C control; modulates 22 kHz tone onto output to select low-band (950–1450 MHz) or high-band (1450–2150 MHz) LNB operation.

Use Value: Factory-programmable voltage levels ensure compatibility with global LNB standards without hardware change - accelerates regional product certification.

PC Card Satellite Receiver

Multi-Switch Distribution System

Use Scenario: PCIe or ExpressCard-based satellite tuner for laptops/desktops requiring ultra-low power and minimal footprint.

IC Role / Device Role: Delivers regulated LNB power and DiSEqC™ signaling from USB-powered or low-voltage auxiliary rail; uses LPM mode during idle to minimize standby current.

Use Value: QFN24 package (4 × 4 mm) and integrated power stage enable <12 mm² solution size - fits within tight card-edge constraints while meeting EN55032 Class B EMI limits.

Use Scenario: Central distribution unit feeding up to 4 satellite receivers from one dish using DiSEqC™-controlled multi-switch.

IC Role / Device Role: Powers and controls multiple LNB inputs simultaneously; monitors each VOUT for open-circuit (IMON) and overvoltage (PDO) to detect faulty cables or miswired switches.

Use Value: Per-channel diagnostics prevent cascading failures - if one LNB shorts, only its channel shuts down (OLR=1), preserving service to other receivers.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LNB supply and DiSEqC™ interface applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX2181AETL+	Single-channel, no integrated DiSEqC™ tone generator; requires external 22 kHz source and discrete LDOs.	Limited to single-tuner designs; lacks bi-directional DiSEqC™ 2.0 support (no DETIN/DSQOUT).	Select only for cost-sensitive single-LNB applications where DiSEqC™ 2.x is not required and board space permits discrete support components.
TDA8266HN/C1	Integrated tuner + LNB supply; fixed 13/18 V outputs; no I²C programmability or diagnostics.	Designed for monolithic tuner modules; no per-channel fault isolation or real-time VMON/TMON reporting.	Choose only for legacy tuner IC integration where system-level diagnostics are handled externally and voltage flexibility is unnecessary.

Compared with MAX2181AETL+ and TDA8266HN/C1, the LNBH26SPQR delivers dual-channel independence, full DiSEqC™ 2.0 bi-directionality, and comprehensive I²C-accessible diagnostics - enabling higher system reliability, smaller form factors, and faster time-to-market for multi-tuner satellite platforms.

Availability

LNBH26SPQR 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 assurance, and compliance with ESD (±4 kV HBM) and surge immunity specifications.

Supply support for LNBH26SPQR 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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog chips, and automotive-grade components with ISO 9001 and IATF 16949 certified facilities.

The LNBH26SPQR belongs to ST's satellite interface product line, engineered specifically for high-reliability, low-power LNB power delivery and DiSEqC™ control in consumer and professional broadcast equipment - emphasizing thermal efficiency, diagnostic transparency, and seamless I²C integration.

FAQ

What is the purpose of the BPSW-A and BPSW-B pins?

The BPSW-A and BPSW-B pins control external transistors that bypass the output R-L filter during 22 kHz tone transmission. This preserves waveform integrity in DiSEqC™ 2.x applications by eliminating filter-induced distortion while retaining EMI suppression during steady-state DC supply. Each pin must be driven high before tone activation and low afterward, synchronized with the TEN bit.

How does the LPM (low power mode) affect thermal performance?

When LPM=1, the LDO dropout voltage drops from 1.0 V to 0.6 V, reducing power dissipation by 40% at 500 mA (from 0.5 W to 0.3 W). This directly lowers junction temperature rise - critical in sealed STB enclosures - but requires LPM=0 during any 22 kHz transmission to maintain tone amplitude and timing accuracy per DiSEqC™ spec.

Can the LNBH26SPQR support DiSEqC™ 2.0 bidirectional communication?

Yes. Each channel features dedicated DETIN (input) and DSQOUT (output) pins with internal tone detection and open-drain drivers. When AC-coupled to the DiSEqC™ bus, DETIN detects incoming LNB replies, and DSQOUT delivers decoded pulses to the host MCU - enabling full DiSEqC™ 2.0 command/response cycles without external comparators or logic gates.

What happens when an overload condition triggers the OLF bit?

When OLF=1, the FLT pin goes low and the condition latches until cleared by I²C register read. Recovery behavior depends on the OLR bit: if OLR=1, the affected VOUT is disabled (VSEL reset to 0); if OLR=0, the output resumes automatically after fault removal. Dynamic PCL mode further limits average power during sustained shorts via timed ON/OFF cycling.

LNBH26SPQR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 24-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Applications:: Converter, Analog and Digital Satellite STB Receivers/SatTV

Voltage - Input:: 8V ~ 16V

Number of Outputs:: 2

Voltage - Output:: 13V, 18V

Operating Temperature:: 0°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 24-QFN (4x4)

LNBH26SPQR FAQ

1.How can I place an order for LNBH26SPQR through Aetrix?

Please submit a Request for Quotation (RFQ) for LNBH26SPQR 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 LNBH26SPQR reliable?

The price and inventory of LNBH26SPQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH26SPQR is usually 5 days.

3.What payment methods are accepted for LNBH26SPQR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH26SPQR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LNBH26SPQR?

LNBH26SPQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LNBH26SPQR 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 LNBH26SPQR?

For technical support, including LNBH26SPQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH26SPQR requirements.

6.How does Aetrix verify that LNBH26SPQR is sourced from the original manufacturer or authorized distributors?

All LNBH26SPQR 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 LNBH26SPQR meets industry standards.

7.What is the process for return or replacement of LNBH26SPQR?

All LNBH26SPQR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH26SPQR, 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 LNBH26SPQR part is unused and in its original packaging.

Return procedure for LNBH26SPQR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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