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

STMicroelectronics LNBH24LQTR

Name: LNBH24LQTR
Brand: STMicroelectronics
SKU: LNBH24LQTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LNBH24LQTR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 32-VFQFN Exposed Pad

Datasheet:: LNBH24LQTR.pdf

Description:: IC REG CONV SAT TV 2OUT 32QFN

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LNBH24LQTR from STMicroelectronics is a dual-channel LNB supply and control IC for satellite receiver systems, integrating two independent 13/18 V linear post-regulators with integrated step-up PWM controllers, I²C interface, 22 kHz tone generation, DiSEqC™ 1.X encoding support, and comprehensive diagnostics. It delivers up to 500 mA per channel at 93% typical efficiency from a single 8–15 V input, targeting dual-tuner STBs and Sat-PC cards.

For engineers reviewing the LNBH24LQTR datasheet, LNBH24LQTR pinout, LNBH24LQTR application, or LNBH24LQTR equivalent, key selection criteria include dual-channel voltage selection (13/18 V), I²C-accessible diagnostic bits (OTF/OLF), EXTM-based analog modulation for DiSEqC™, dynamic short-circuit protection timing (TON/TOFF), and QFN32 5×5 mm ePAD thermal performance.

Technical Context

The LNBH24LQTR implements two fully independent sections (A/B), each with dedicated LX, VoRX, VoTX, DSQIN, EXTM, PDC, ISEL, and ADDR pins - sharing only VCC, VCC-L, SDA, SCL, and A-GND. Each section features a high-efficiency step-up converter (VUP generation) feeding a low-drop linear regulator (VoRX output), with internal 22 kHz oscillator selectable via TTX bit or DSQIN edge-triggering.

DiSEqC™ 1.X encoding is supported through three modes: (1) DSQIN-driven internal tone burst, (2) EXTM analog superposition of external 22 kHz, or (3) VoTX-to-EXTM loopback with optional PDC active pull-down for capacitive load compensation. Protection includes pulsed current limiting (PCL bit configurable), over-temperature shutdown (150°C trip, 135°C recovery), and I²C-readable diagnostic flags.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	13 V or 18 V per channel, selectable via I²C VSEL bit + LLC compensation for line drop
Max Output Current	500 mA per channel (typ.), limited by external RSEL resistor (e.g., 15 kΩ → ~667 mA)
Step-Up Efficiency	93% typ. @ 0.5 A, minimizing thermal load in compact STB enclosures
22 kHz Tone Source	Factory-trimmed internal oscillator; enabled via TTX bit or DSQIN TTL edge, with ±25 µs timing precision
Diagnostic Interface	I²C-readable OTF (over-temp) and OLF (over-load) flags, plus EN/VSEL/LLC status bits
ESD Rating	±4 kV HBM on VoRX power pins; ±2 kV on logic pins (TTX, SDA, SCL, DSQIN)
Thermal Resistance	R_thJC = 2 °C/W; R_thJA = 35 °C/W (2s2p PCB), enabling >1 W dissipation with proper ePAD grounding

Pinout & Package

Package: QFN32 5 × 5 mm with exposed thermal pad (ePAD), requiring soldered vias to internal ground plane for thermal management.

Pin/Terminal	Circuit Role	Design Meaning
VCC / VCC-L	Power Input	Dual-supply inputs (8–15 V): VCC powers DC-DC stage; VCC-L powers analog/linear regulator circuitry
VoRX-A / VoRX-B	LDO Output	Main 13/18 V DC output to LNB; includes built-in low-drop post-regulation (VUP − VoRX ≈ 1.1 V)
EXTM-A / EXTM-B	Analog Modulation Input
DSQIN-A / DSQIN-B	DiSEqC™ Data Input	TTL-level DiSEqC™ command input; triggers immediate internal 22 kHz burst with precise 0.5-cycle delay
TTX-A / TTX-B	Tone Enable Control	Hardware enable for 22 kHz oscillator; must be LOW in standby to prevent spurious tone emission
ISEL-A / ISEL-B	Current Limit Set	Connects to GND via RSEL resistor; sets linear regulator current limit per Equation 1 (Imax = 10000/RSEL)
PDC-A / PDC-B	Pull-Down Control	Drives external NPN transistor to discharge output capacitance during 22 kHz transitions, reducing distortion
SCL / SDA	I²C Bus Interface	Standard bidirectional I²C interface (up to 400 kHz); supports two independent addresses per section via ADDR-A/B

Key Features

Feature	Design Value
Dual independent LNB channels	Section A and B operate autonomously with separate control, diagnostics, and external components
Integrated DiSEqC™ 1.X encoder	Supports burst-mode (DSQIN), continuous-tone (TEN bit), and EXTM analog modulation - no external MCU tone generation required
Dynamic short-circuit protection	PCL bit enables cycling (TON = 90 ms / TOFF = 900 ms) to limit average power dissipation during sustained fault
Thermal-aware diagnostics	I²C-readable OTF flag latches at 150°C junction temp and auto-clears at 135°C - enables predictive thermal throttling
Low-component-count design	Eliminates discrete DC-DC + LDO + tone generator + DiSEqC™ driver; reduces BOM by ≥12 passive/active parts per channel

Applications

Satellite Dual-Tuner STB

Sat-PC TV Tuner Card

Use Scenario: Integrated dual-LNB power and control in compact set-top boxes supporting simultaneous reception from two orbital positions.

IC Role / Device Role / Timing Role: Provides independent 13/18 V bias and 22 kHz signaling to two LNBs; handles DiSEqC™ switching via DSQIN or EXTM under I²C host control.

Use Value: Enables zero-latency DiSEqC™ switching (<100 µs response), eliminates external tone generators, and maintains <1.1 V dropout across full 500 mA load range.

Use Scenario: Low-profile PCIe or USB-based satellite TV tuner card for desktop/laptop PCs requiring dual LNB support.

IC Role / Device Role / Timing Role: Delivers regulated LNB power and DiSEqC™-compliant signaling within strict height and thermal constraints; uses EXTM modulation to remove bulky R-L filters.

Use Value: Reduces board area by 35% vs discrete solution; ePAD thermal path sustains 1.2 W total dissipation at 70°C ambient without heatsink.

Multi-Switch Distribution Box

Professional Satellite Monitoring System

Use Scenario: Centralized multi-switch unit distributing signals from 4+ LNBs to multiple receivers, requiring robust LNB powering and DiSEqC™ routing.

IC Role / Device Role / Timing Role: Acts as intelligent LNB interface per output port; uses I²C diagnostics to detect open-circuit, short, or thermal overload conditions per channel.

Use Value: Enables remote fault identification via I²C read-back (OTF/OLF bits), eliminating manual continuity checks during field maintenance.

Use Scenario: Lab-grade satellite signal analyzer with simultaneous multi-LNB monitoring and real-time DiSEqC™ protocol validation.

IC Role / Device Role / Timing Role: Supplies precision 13/18 V outputs with <±1% regulation; provides cycle-accurate 22 kHz tone (±25 µs jitter) for protocol conformance testing.

Use Value: Supports DiSEqC™ 1.0/1.1/1.2 compliance verification using VoTX pin output synchronized to DSQIN edge - traceable to internal oscillator.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX2181AETL+	Single-channel only; requires dual ICs for two LNBs; no integrated EXTM modulation path	Lacks native DiSEqC™ burst mode via DSQIN; relies on external MCU tone generation	Choose when system already uses MAX2181-based single-LNB design and can accommodate duplicated layout
SPS610A	No I²C interface; uses parallel GPIO control; no diagnostic feedback bits	Fixed 13/18 V selection per pin; no software-configurable LLC compensation or real-time OLF/OTF reporting	Prefer for cost-sensitive, non-diagnostic applications where firmware complexity must be minimized

Compared with MAX2181AETL+ and SPS610A, the LNBH24LQTR uniquely integrates dual-channel operation, EXTM-based DiSEqC™ simplification, and I²C-accessible diagnostics - reducing component count by ≥30% and enabling predictive LNB health monitoring in production STBs.

Availability

LNBH24LQTR is available at Aetrix Electronics and suitable for satellite STBs, Sat-PC tuner cards, and multi-switch distribution boxes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LNBH24LQTR 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 semiconductors since 1987.

The LNBH24LQTR belongs to ST's Satellite Receiver Power Management product line, engineered specifically for high-efficiency, space-constrained dual-LNB systems in consumer and professional broadcast equipment.

FAQ

What is the maximum total output current capability of the LNBH24LQTR?

The LNBH24LQTR supports up to 500 mA per channel (A and B), but ST recommends limiting combined output current (IOUT_A + IOUT_B) to less than 1 A continuously to avoid triggering over-temperature protection. This constraint arises from thermal coupling between sections and the shared QFN32 ePAD thermal path - exceeding 1 A aggregate load risks junction temperature exceeding 125°C under typical PCB layouts.

How does the EXTM pin enable DiSEqC™ without an external tone generator?

The EXTM pin accepts an AC-coupled 22 kHz signal (via series capacitor) and internally modulates the VoRX DC output, superimposing the tone directly onto the LNB supply line. This eliminates the need for discrete R-L filters and external oscillators. When used with the internal VoTX signal looped to EXTM, the IC generates compliant DiSEqC™ bursts with precise timing - confirmed by Figure 3 in the datasheet and validated per EUTELSAT specifications.

Can the LNBH24LQTR operate from a 5 V input supply?

No - the LNBH24LQTR requires a minimum 8 V DC input on VCC/VCC-L pins, as specified in Table 4 (Operating Ratings). The internal step-up converter needs sufficient headroom to generate VUP (~14–20 V) for the linear post-regulator to maintain 13/18 V VoRX output with ≤1.1 V dropout. A 5 V supply falls below the 6.7 V UVLO threshold and will disable all regulation functions.

What is the function of the PDC pin and when should it be used?

The PDC pin drives an external NPN transistor to actively discharge output capacitance during 22 kHz transitions, preventing tone distortion under light-load (<50 mA) and high-capacitance conditions. It is optional and only needed when Figure 4's "PDC optional circuit" is implemented - typically in multi-switch boxes with long coaxial runs (>30 m) and large decoupling caps (>10 µF) at the LNB end.

LNBH24LQTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

Voltage - Input:: 8V ~ 15V

Number of Outputs:: 2

Voltage - Output:: 13.3V, 18.2V

Operating Temperature:: 0°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-QFN (5x5)

LNBH24LQTR FAQ

1.How can I place an order for LNBH24LQTR through Aetrix?

Please submit a Request for Quotation (RFQ) for LNBH24LQTR 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 LNBH24LQTR reliable?

The price and inventory of LNBH24LQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH24LQTR is usually 5 days.

3.What payment methods are accepted for LNBH24LQTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH24LQTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LNBH24LQTR?

LNBH24LQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LNBH24LQTR 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 LNBH24LQTR?

For technical support, including LNBH24LQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH24LQTR requirements.

6.How does Aetrix verify that LNBH24LQTR is sourced from the original manufacturer or authorized distributors?

All LNBH24LQTR 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 LNBH24LQTR meets industry standards.

7.What is the process for return or replacement of LNBH24LQTR?

All LNBH24LQTR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH24LQTR, 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 LNBH24LQTR part is unused and in its original packaging.

Return procedure for LNBH24LQTR:

1.Submit a request within 90 days.

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

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