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

STMicroelectronics LNBH25SPQR

Name: LNBH25SPQR
Brand: STMicroelectronics
SKU: LNBH25SPQR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LNBH25SPQR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 24-VFQFN Exposed Pad

Datasheet:: LNBH25SPQR.pdf

Description:: IC REG CONV SAT TV 1OUT 24QFN

Quantity:: RFQ Add To RFQ list

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Inventory:1,350

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Product details

Overview

LNBH25SPQR from STMicroelectronics is a monolithic LNB supply and control IC for satellite receiver front-ends, integrating a high-efficiency step-up DC-DC converter (93% @ 0.5 A), programmable 13/18 V output (15 levels), and I²C-controlled 22 kHz tone generation compliant with DiSEqC standards. It delivers regulated power and signaling to LNB down-converters in STB, TV, and PC card satellite receivers using a single 8–16 V input.

For engineers reviewing the LNBH25SPQR datasheet, LNBH25SPQR pinout, LNBH25SPQR application, or LNBH25SPQR equivalent, this device supports DiSEqC 1.x/2.0 bidirectional communication, offers real-time diagnostics via I²C status registers (VMON, TMON, IMON, OLF, OTF), and enables low-power mode (LPM) to reduce LDO dissipation to 0.3 W @ 500 mA.

Technical Context

The LNBH25SPQR implements a two-stage regulation architecture: a PWM-based step-up converter generates an intermediate VUP voltage (~14 V or ~19 V), followed by a low-dropout linear post-regulator that precisely sets 13 V or 18 V output while maintaining VUP–VOUT ≈ 1 V (normal mode) or 0.6 V (LPM mode). Its integrated 22 kHz tone generator is factory-trimmed and supports three activation modes - internal continuous, external TTL waveform on DSQIN, or envelope-triggered DiSEqC transmission.

DiSEqC 2.0 compliance is achieved through dedicated pins: DETIN (AC-coupled tone detection), DSQOUT (PWK data extraction), and BPSW (external transistor control to bypass RL filter during transmission). Diagnostic functions include latched fault flags (OLF, OTF, PNG), open-drain FLT output, and eight I²C-accessible status bits covering voltage, current, tone integrity, and thermal conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	8 V to 16 V - supports standard STB power rails without external pre-regulation
Output Voltage Accuracy	±3% over load/temperature - ensures stable LNB bias within satellite signal specification limits
Step-up Efficiency	93% typ. @ 0.5 A - minimizes heat rise in compact QFN24L package
22 kHz Tone Frequency	22.0 kHz ±100 Hz - meets ETSI EN 300 421 and DiSEqC 1.0/2.0 timing requirements
Output Current Limit	Programmable up to 1 A via ISEL resistor - allows flexible LNB load matching and short-circuit protection tuning
LPM Power Dissipation	0.3 W typ. @ 500 mA - reduces thermal stress during idle periods in multi-LNB systems
ESD Tolerance	±4 kV HBM on VOUT pins - withstands antenna cable electrostatic discharge events

Pinout & Package

Supplied in QFN24L (4 × 4 mm, 0.5 mm pitch) package with exposed thermal pad for enhanced power dissipation in space-constrained satellite receiver PCBs.

Pin/Terminal	Circuit Role	Design Meaning
VCC	Primary power input	Accepts 8–16 V supply; feeds internal regulators and logic
VOUT	LNB output power and tone node	Delivers 13/18 V DC + superimposed 22 kHz tone to LNB; rated for 1 A max
DSQIN	DiSEqC tone/data input	TTL-compatible pin enabling external tone or envelope-triggered DiSEqC encoding
DETIN	DiSEqC tone detection input	AC-coupled input for bidirectional DiSEqC 2.0 bus monitoring
DSQOUT	DiSEqC PWK data output	Provides extracted pulse-width modulated data from incoming DiSEqC bus
BPSW	RL filter bypass control	Drives external transistor to disable output filter during DiSEqC 2.x transmission
FLT	Fault flag output	Open-drain indicator asserting low on overload, overtemperature, or input undervoltage
ISEL	Current limit programming	Connects to GND via resistor to set output current limit (up to 1 A)

Key Features

Feature	Design Value
Integrated DiSEqC 2.0 transceiver	Enables full bidirectional communication with multi-switches and legacy LNBs without external logic
I²C-accessible diagnostics	Eight real-time status bits (VMON, TMON, IMON, OLF, OTF, PDO, PNG, TDET) enable firmware-driven fault isolation
Configurable LPM mode	Reduces LDO dropout to 0.6 V, cutting dissipation by 40% vs. active mode at 500 mA
Programmable output voltage	15 discrete 13/18 V levels selectable via I²C register - supports regional LNB standards and multi-voltage switching
Dynamic short-circuit protection	Fast-response current limiting with automatic recovery - prevents latch-up during LNB cable faults

Applications

Set-Top Box (STB) Satellite Receivers

TV Satellite Receivers

Use Scenario: Integrated into DVB-S/S2 STB mainboard to power and control single/multi-LNB configurations via DiSEqC 1.x commands.

IC Role / Device Role / Timing Role: Primary LNB interface IC providing regulated 13/18 V, 22 kHz tone, and DiSEqC command decoding/encoding.

Use Value: Eliminates need for discrete boost converter, LDO, and tone generator - reduces BOM count by ≥7 components and PCB area by >30 mm².

Use Scenario: Embedded in flat-panel TV satellite tuners requiring compact, thermally efficient LNB power delivery.

IC Role / Device Role / Timing Role: Monolithic regulator and DiSEqC controller managing voltage selection, tone generation, and fault reporting over I²C.

Use Value: Enables silent operation via LPM mode and maintains <1.5 °C temperature rise at 500 mA - critical for sealed TV enclosures.

PC Card Satellite Receivers

Multi-Switch Satellite Distribution Systems

Use Scenario: Used in PCIe/USB satellite tuner cards where space and power efficiency are constrained.

IC Role / Device Role / Timing Role: Supplies LNB power and handles DiSEqC 2.0 bidirectional communication for multi-LNB addressing.

Use Value: Supports hot-plug operation with soft-start (4–6 ms ramp) and undervoltage lockout (4.7 V threshold) - prevents host system instability.

Use Scenario: Deployed in 4/8-way DiSEqC multi-switch boxes to drive multiple LNB outputs with independent voltage/tone control.

IC Role / Device Role / Timing Role: Centralized LNB driver IC managing per-output diagnostics, current limiting, and surge-protected VOUT nodes.

Use Value: Built-in ±4 kV ESD tolerance on VOUT and integrated surge detection (PDO bit) simplify external TVS design for outdoor-rated equipment.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX2181AETM+	Higher input voltage range (4.5–20 V); no integrated DiSEqC 2.0 detector; requires external tone generator for DiSEqC 2.x	Lacks native DiSEqC 2.0 receive path (DETIN/DSQOUT/BPSW), limiting use to DiSEqC 1.x-only systems	Select when operating from wider input rails and DiSEqC 2.0 is not required; verify external tone circuit compatibility
LMX2531LQ1730E	RF synthesizer with integrated LNB bias; no step-up converter; relies on external 13/18 V supply	Cannot replace LNBH25SPQR in single-supply designs - requires separate DC-DC stage and tone generation	Only suitable as partial substitute in RF-centric designs where LNB power is pre-regulated and DiSEqC is handled externally

Compared with MAX2181AETM+ and LMX2531LQ1730E, the LNBH25SPQR uniquely integrates step-up conversion, DiSEqC 2.0 transceivers, and comprehensive I²C diagnostics in one QFN24L package - eliminating external components needed for voltage generation, tone synthesis, and bidirectional bus interfacing.

Availability

LNBH25SPQR is available at Aetrix Electronics and suitable for set-top box satellite receivers, TV satellite receivers, and PC card satellite receivers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LNBH25SPQR 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, specializing in analog, power, and automotive ICs with broad industrial and consumer market reach.

The LNBH25SPQR belongs to ST's satellite receiver interface product line, engineered specifically to consolidate LNB power, DiSEqC control, and diagnostics into a single chip for cost-sensitive, space-constrained digital TV and STB applications.

FAQ

What is the maximum supported output current and how is it configured?

The LNBH25SPQR supports up to 1 A output current, programmable via an external resistor connected between ISEL pin and GND. The relationship follows ILIM(typ.) = 13915 / RSEL^1.111 (RSEL in kΩ). Configuration is non-volatile per power cycle and verified by reading the IMON diagnostic bit when load drops below 12 mA.

How does the LPM (low power mode) affect output voltage regulation?

In LPM mode (LPM bit = 1), the internal LDO dropout voltage is reduced from 1 V to 0.6 V typ., lowering power dissipation by ~40% at 500 mA. Output voltage remains fully regulated at selected 13/18 V level, but 22 kHz tone generation is disabled - LPM must be cleared before DiSEqC transmission.

Can the LNBH25SPQR support DiSEqC 2.0 bidirectional communication without external components?

Yes - the IC provides native DiSEqC 2.0 support via dedicated DETIN (tone detection), DSQOUT (PWK data output), and BPSW (filter bypass) pins. An external AC-coupling capacitor on DETIN and RL filter on VOUT are required per ETSI spec, but no additional logic or tone generators are needed.

What diagnostic functions are accessible via I²C and how are they used in system firmware?

Eight diagnostic bits - VMON (output voltage), TMON (tone integrity), IMON (minimum load), OLF (overload), OTF (overtemperature), PDO (VOUT short), PNG (input UVLO), and TDET (tone presence) - are readable in Status Registers 0x0 and 0x1. Firmware reads these after each command to confirm LNB presence, detect cable faults, and trigger FLT pin assertion for hardware-level fault handling.

LNBH25SPQR 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:: 1

Voltage - Output:: 13V, 18V

Operating Temperature:: 0°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

LNBH25SPQR FAQ

1.How can I place an order for LNBH25SPQR through Aetrix?

Please submit a Request for Quotation (RFQ) for LNBH25SPQR 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 LNBH25SPQR reliable?

The price and inventory of LNBH25SPQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH25SPQR is usually 5 days.

3.What payment methods are accepted for LNBH25SPQR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH25SPQR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LNBH25SPQR?

LNBH25SPQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LNBH25SPQR 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 LNBH25SPQR?

For technical support, including LNBH25SPQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH25SPQR requirements.

6.How does Aetrix verify that LNBH25SPQR is sourced from the original manufacturer or authorized distributors?

All LNBH25SPQR 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 LNBH25SPQR meets industry standards.

7.What is the process for return or replacement of LNBH25SPQR?

All LNBH25SPQR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH25SPQR, 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 LNBH25SPQR part is unused and in its original packaging.

Return procedure for LNBH25SPQR:

1.Submit a request within 90 days.

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

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