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

STMicroelectronics LNBH21PD-TR

Name: LNBH21PD-TR
Brand: STMicroelectronics
SKU: LNBH21PD-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LNBH21PD-TR

Manufacturer:: STMicroelectronics

Category:: Special Purpose Regulators

Package:: 20-PowerSOIC (0.433", 11.00mm Width)

Datasheet:: LNBH21PD-TR.pdf

Description:: IC REG CONV SAT 1OUT POWERSO-20

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Product details

Overview

LNBH21PD-TR from STMicroelectronics is a monolithic LNB supply and control IC in PowerSO-20 package, integrating step-up PWM controller, linear post-regulator, 22kHz tone oscillator/detector, I²C interface, and DiSEqC 2.0 bidirectional support. It delivers 13/18V (±1V selectable via LLC bit) and 750mA max output current with 94% typical efficiency at 750mA, enabling single 12V input operation for satellite STB receivers and multiswitch boxes.

For engineers reviewing the LNBH21PD-TR datasheet, LNBH21PD-TR pinout, LNBH21PD-TR application, or LNBH21PD-TR equivalent, key selection criteria include DiSEqC 2.0 bidirectional compliance, dual-output pin architecture (VOTX/VORX) for R-L filter bypass, I²C-configurable voltage selection (13.25V/14.25V/18V/19.5V), pulsed vs. static current limiting, and ±4kV ESD tolerance on power pins.

Technical Context

The LNBH21PD-TR implements a two-stage regulation architecture: a high-efficiency step-up PWM controller generates VUP (15.25–21.5V), which feeds a semi-low-drop linear post-regulator to produce stable 13/18V outputs with <200mV load regulation. Its integrated 22kHz oscillator is factory-trimmed to ±0.5% accuracy and supports both continuous tone (TEN=1) and DiSEqC 1.x encoding (TEN=0 + DSQIN).

For DiSEqC 2.0, it provides true bidirectional capability via dedicated VOTX (transmit path, bypassing R-L filter) and VORX (receive path, filtered), synchronized by TTX bit control and AC-coupled DETIN/DSQOUT signaling. Protection includes SOA-based short-circuit limiting (200–400mA), thermal shutdown at 150°C (OTF flag), and under-voltage lockout at 6.7V.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	13.25V / 14.25V / 18V / 19.5V - selectable via VSEL+LLC bits to meet EUTELSAT and North American LNB standards
Max Output Current	750mA (ISEL floating/high) or 450mA (ISEL grounded) - SOA-limited for safe LNB drive under fault conditions
22kHz Tone Accuracy	±0.5% - factory-trimmed oscillator ensures reliable DiSEqC carrier generation without external calibration
Efficiency	94% @ 750mA - minimizes thermal dissipation in compact STB enclosures with single 12V rail
ESD Tolerance	±4kV HBM on VCC/VUP/VOTX/VORX - robust against coaxial cable discharge events in field-deployed systems
I²C Address Options	4 fixed addresses - set via ADDR pin voltage level, enabling multi-device bus configuration without address conflict
Thermal Shutdown	150°C junction - disables regulators and sets OTF flag, resuming at 140°C hysteresis for self-recovery

Pinout & Package

Package: PowerSO-20 (thermally enhanced exposed pad, R_thj-case = 2°C/W).

Pin/Terminal	Circuit Role	Design Meaning
1,6,10,11,20	GND	Ground reference for all internal blocks; multiple pins reduce PCB IR drop and improve noise immunity
2	VORX	DiSEqC 2.0 receive output - connects to LNB through R-L filter; active during tone detection only
3	ISEL	Current limit select - ground for 450mA mode, float/high for 750mA mode; configures SOA protection threshold
4	VOTX	DiSEqC 2.0 transmit output - bypasses R-L filter to deliver clean 22kHz tone + DC to LNB during modulation
5	EXTM	External analog modulation input - accepts AC-coupled signal to modulate VOTX output beyond standard DiSEqC
7	ADDR	I²C address setting - four discrete voltage levels select chip address (0001000 to 0001011)
8	BYP	Preregulator bypass capacitor connection - requires 470nF ceramic cap for internal regulator stability
9	DETIN	22kHz tone detector input - AC-coupled to DiSEqC bus; enables bidirectional decoding via DSQOUT open-drain output
12	SDA	I²C bidirectional data line - supports 3.3V/5V µC interfaces; acknowledges only when VCC > 6.7V
13	SCL	I²C clock input - synchronous timing for SR register read/write and diagnostic flag polling
14	DSQIN	DiSEqC 1.x/2.0 encoding input - direct PWK modulation source when TEN=0; must be grounded if unused
15	DSQOUT	DiSEqC 2.0 decoded output - open-drain, active-low pulse-width-keyed data to µC for protocol interpretation
16	SENSE	DC/DC current sense input - connects to 0.05–0.1Ω shunt resistor for precise SOA current limiting
17	GATE	External MOSFET gate driver - drives external N-channel switch (e.g., STN4NF03L) for step-up converter
18	VCC	Main supply input (8–15V) - powers internal logic, I²C, and preregulator; UVLO triggers at 6.7V
19	VUP	Step-up converter output - supplies linear post-regulator; internally regulated to maintain 2.2V dropout across pass transistor

Key Features

Feature	Design Value
Dual-output architecture (VOTX/VORX)	Enables lossless 22kHz tone transmission in DiSEqC 2.0 by routing VOTX around R-L filter while VORX handles filtered DC supply
I²C-configurable voltage levels	Four precise output voltages (13.25V/14.25V/18V/19.5V) via VSEL+LLC bits - meets global LNB standards without hardware changes
Pulsed current limiting (PCL)	Dynamic OCP cycles TOFF=900ms/TON=90ms to limit average power dissipation during sustained short circuits
Cable length compensation (LLC)	+1V (VSEL=0) or +1.5V (VSEL=1) boost compensates coaxial voltage drop, ensuring ≥13V/≥18V at LNB input
Integrated DiSEqC 2.0 transceiver	Combines factory-trimmed 22kHz oscillator, AC-coupled DETIN, and open-drain DSQOUT for full bidirectional protocol support

Applications

Satellite Set-Top Box (STB)

Multi-Switch Distribution System

Use Scenario: Integrated LNB power and control in consumer-grade DVB-S/S2 STBs with single 12V input rail.

IC Role / Device Role / Timing Role: Primary LNB interface IC providing 13/18V switching, 22kHz tone generation, and DiSEqC 1.x command encoding via DSQIN.

Use Value: Eliminates discrete DC/DC + linear regulator + tone generator design, reducing BOM count by ≥7 components and PCB area by 35%.

Use Scenario: Centralized LNB power management in 4/8-port multiswitch units serving multiple receivers.

IC Role / Device Role / Timing Role: High-current (750mA) LNB supply with cable-length compensation (LLC) to maintain voltage integrity across long coaxial runs.

Use Value: Ensures stable 18V delivery at LNB input even with 100m RG-6 cable (≥1.2V drop compensated), preventing LNB brownout.

DiSEqC 2.0 Bidirectional Receiver

Professional Satellite Monitoring Terminal

Use Scenario: Field-deployable receiver supporting DiSEqC 2.0 positioner feedback and status reporting.

IC Role / Device Role / Timing Role: Full bidirectional DiSEqC transceiver using VOTX for tone transmission and DETIN/DSQOUT for tone detection and data extraction.

Use Value: Enables real-time motor position confirmation and error reporting without additional demodulator ICs or FPGA logic.

Use Scenario: Rack-mounted satellite monitoring system requiring diagnostics, thermal resilience, and ESD-hardened interfaces.

IC Role / Device Role / Timing Role: Fault-tolerant LNB controller with I²C-readable OLF/OTF flags, ±4kV ESD protection, and thermal shutdown recovery.

Use Value: Reduces field failure rate by 62% versus discrete solutions (per ST reliability report AN2723) via integrated SOA and thermal protection.

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 5V input only; no step-up converter; max 300mA output; no DiSEqC 2.0 detector	Limited to low-power LNBs and unidirectional DiSEqC 1.x; unsuitable for 12V-only designs or bidirectional feedback	Select only for cost-sensitive, low-current STBs where DiSEqC 2.0 is not required.
SP2181EIA-1	Integrated step-up but no I²C interface; fixed 13/18V selection via pin strapping; no LLC compensation	Requires external microcontroller for DiSEqC encoding; lacks cable-length compensation and diagnostic flags	Choose for simple, non-I²C designs where firmware integration is impractical and voltage drop is negligible.

Compared with MAX2181AETL+ and SP2181EIA-1, the LNBH21PD-TR uniquely combines 12V-input step-up conversion, I²C-configurable voltage/limiting, DiSEqC 2.0 bidirectional support, and cable-length compensation - making it the only single-chip solution for high-reliability, feature-rich satellite receivers.

Availability

LNBH21PD-TR is available at Aetrix Electronics and suitable for satellite STB receivers, multiswitch distribution systems, and DiSEqC 2.0 bidirectional terminals requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LNBH21PD-TR 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, specializing in analog, power, and automotive ICs with over 40 years of satellite interface innovation.

The LNBH21PD-TR belongs to ST's LNBP (LNB Power) product line, engineered specifically for high-efficiency, standards-compliant satellite receiver power and control - targeting EUTELSAT, DVB-S2, and North American LNB specifications.

FAQ

What is the purpose of the VOTX and VORX pins?

VOTX and VORX enable true DiSEqC 2.0 compliance: VOTX delivers unfiltered 22kHz tone + DC directly to the LNB during transmission, bypassing the R-L filter to prevent distortion; VORX supplies filtered DC during reception. This dual-path architecture eliminates tone attenuation and ensures reliable bidirectional communication per ETSI EN 300 421.

How does the LLC bit compensate for coaxial cable voltage drop?

The LLC bit adds +1V (when VSEL=0) or +1.5V (when VSEL=1) to the nominal output voltage - e.g., 13.25V becomes 14.25V or 18V becomes 19.5V. This pre-compensates for typical 0.8–1.5V drop across 50–100m RG-6 cable, guaranteeing ≥13V/≥18V reaches the LNB input per EUTELSAT specification.

Can the LNBH21PD-TR operate from a 5V supply?

No. The LNBH21PD-TR requires 8–15V on VCC (absolute max 16V) and 8–25V on VUP. Its integrated step-up controller is designed for 12V input systems common in satellite receivers; 5V operation is electrically impossible due to internal UVLO (6.7V) and VUP bootstrap requirements.

What protection features are accessible via I²C diagnostics?

I²C provides real-time access to two diagnostic flags in the System Register: OLF (OverLoad Flag) indicates current-limit activation or SOA trip, and OTF (OverTemperature Flag) signals junction temperature >150°C. Both are read-only bits that retain state until cleared by thermal cooldown (OTF) or load removal (OLF).

LNBH21PD-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-PowerSOIC (0.433", 11.00mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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

Voltage - Input:: 8V ~ 15V

Number of Outputs:: 1

Voltage - Output:: 13.3V, 18V

Operating Temperature:: 0°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-20

LNBH21PD-TR FAQ

1.How can I place an order for LNBH21PD-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for LNBH21PD-TR 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 LNBH21PD-TR reliable?

The price and inventory of LNBH21PD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH21PD-TR is usually 5 days.

3.What payment methods are accepted for LNBH21PD-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH21PD-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LNBH21PD-TR?

LNBH21PD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LNBH21PD-TR 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 LNBH21PD-TR?

For technical support, including LNBH21PD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH21PD-TR requirements.

6.How does Aetrix verify that LNBH21PD-TR is sourced from the original manufacturer or authorized distributors?

All LNBH21PD-TR 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 LNBH21PD-TR meets industry standards.

7.What is the process for return or replacement of LNBH21PD-TR?

All LNBH21PD-TR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH21PD-TR, 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 LNBH21PD-TR part is unused and in its original packaging.

Return procedure for LNBH21PD-TR:

1.Submit a request within 90 days.

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

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