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STMicroelectronics LNBH21PD
- Part No.:
- LNBH21PD
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 20-SOIC (0.433", 11.00mm Width) Exposed Pad
- Datasheet:
-
LNBH21PD.pdf
- Description:
- IC REG CONV SAT 1OUT POWERSO-20
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
LNBH21PD 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 (±0.75V) output with selectable 450mA/750mA current limit, 94% typical DC/DC efficiency at 750mA, and ±4kV ESD tolerance on power pins - used to power satellite LNBs in STB receivers and multiswitch boxes.
For engineers reviewing the LNBH21PD datasheet, LNBH21PD pinout, LNBH21PD application, or LNBH21PD equivalent, key selection criteria include DiSEqC 2.0 bidirectional timing compliance, cable-length voltage compensation (LLC bit), pulsed vs. static current limiting (PCL bit), and dual-output pin architecture (VOTX/VORX) for R-L filter bypass during tone transmission.
Technical Context
The LNBH21PD 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 delivering precise 13/18V (or 14.25/19.5V with LLC) outputs. Its internal 22kHz oscillator is factory-trimmed to ±0.5% accuracy and supports both continuous tone (TEN bit) and DiSEqC 1.x encoding via DSQIN.
DiSEqC 2.0 operation relies on dedicated VOTX (transmit) and VORX (receive) pins, enabling tone transmission without R-L filter distortion; the built-in 22kHz tone detector on DETIN/DSQOUT provides PWK demodulation with AC-coupled input and open-drain output. Protection includes SOA short-circuit limiting, thermal shutdown at 150°C, and I²C-diagnostic bits (OTF, OLF, PCL).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 13.25V or 18V (±0.75V); configurable to 14.25V/19.5V via LLC bit for coaxial cable drop compensation |
| Output Current Limit | Selectable 450mA (ISEL = GND) or 750mA (ISEL floating/V>3.3V); SOA-limited short-circuit current of 200–400mA |
| DC/DC Efficiency | 94% typical at 750mA load; enables low thermal dissipation (0.56W typ. @ 125mA) |
| 22kHz Oscillator Accuracy | ±0.5% factory-trimmed; supports DiSEqC 1.x encoding and continuous tone generation |
| Tone Detection | Built-in AC-coupled 22kHz detector with DSQOUT open-drain output for DiSEqC 2.0 PWK decoding |
| I²C Interface | Standard-compliant 2-wire bus with 8-bit system register (6 writable bits), address selection via ADDR pin (4 options) |
| ESD Tolerance | ±4kV HBM on VCC, VUP, VOTX, VORX, and DETIN pins - ensures robustness in noisy RF environments |
Pinout & Package
Package: PowerSO-20 (thermally enhanced exposed pad, Rthj-case = 2°C/W). Designed for high-power satellite front-end applications requiring efficient heat dissipation and compact layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 18 (VCC) | IC Supply Input | 8–15V main supply; requires 220µF + 470nF parallel bypass for stable operation |
| 17 (GATE) | External MOSFET Gate Drive | Drives external N-channel MOSFET in step-up converter topology |
| 16 (SENSE) | Current Sense Input | Connects to sense resistor (e.g., 0.05Ω) for overcurrent protection and SOA limiting |
| 19 (VUP) | Step-up Output / Post-regulator Input | Internally regulated intermediate voltage (15.25–21.5V); sets dropout headroom for linear regulator |
| 2, 4 (VORX, VOTX) | Bi-directional LNB Output Ports | VORX: 13/18V delivery through R-L filter (DiSEqC 2.0 receive); VOTX: direct tone+power path (no filter loss) |
| 12, 13 (SDA, SCL) | I²C Bus Interface | Standard 2-wire serial interface; supports 100kHz mode with external pull-ups |
| 14 (DSQIN) | DiSEqC Encoding Input | Accepts PWK data from µC when TEN=0; modulates internal 22kHz carrier |
| 9 (DETIN) | Tone Detector Input | AC-coupled 22kHz signal input; enables DiSEqC 2.0 bidirectional communication |
| 15 (DSQOUT) | Tone Detection Output | Open-drain output indicating detected tone; used by µC for PWK data recovery |
| 3 (ISEL) | Current Limit Selection | GND = 450mA limit; floating/high = 750mA limit - configures SOA protection threshold |
| 7 (ADDR) | I²C Address Configuration | Four selectable addresses (0001000–0001011) via voltage level setting |
| 5 (EXTM) | External Modulation Input | DC-blocked analog modulation input for custom tone shaping; requires external capacitor |
| 1,6,10,11,20 (GND) | Ground Connections | Multiple GND pins reduce impedance and improve noise immunity in RF-sensitive LNB supply paths |
Key Features
| Feature | Design Value |
|---|---|
| DiSEqC 2.0 Bidirectional Support | Dedicated VOTX/VORX pins + integrated 22kHz detector enable full compliance with ETSI EN 301 458 without external logic |
| Cable-Length Compensation (LLC) | Increases output voltage by +1V (VSEL=0) or +1.5V (VSEL=1) to offset coaxial voltage drop - meets US LNB standards (19.5V) |
| Pulsed Current Limiting (PCL) | Dynamic protection cycles output OFF (900ms) / ON (90ms) during overload - reduces thermal stress vs. static clamp |
| Fast 22kHz Startup | Oscillator stabilizes in <1ms - enables rapid DiSEqC command execution and channel switching |
| Thermal & Overload Diagnostics | I²C-readable OTF (over-temperature flag) and OLF (overload flag) bits provide real-time fault visibility for system monitoring |
Applications
| Satellite Set-Top Box (STB) | Digital Satellite TV Receiver |
|---|---|
|
Use Scenario: Powering single or dual LNBs in consumer-grade DVB-S/S2 STBs with DiSEqC 1.x switching. IC Role / Device Role / Timing Role: Provides regulated 13/18V supply and 22kHz tone under I²C control; VOTX delivers combined power+tone without R-L filter. Use Value: Reduces BOM count by eliminating discrete regulators, oscillators, and protection circuitry - simplifies PCB layout and lowers cost. |
Use Scenario: Enabling multi-satellite reception via DiSEqC 2.0 multiswitch in premium home entertainment systems. IC Role / Device Role / Timing Role: Manages bidirectional 22kHz tone exchange using VOTX (transmit) and VORX (receive) pins with R-L filter bypass. Use Value: Ensures distortion-free tone transmission and accurate PWK decoding - critical for reliable DiSEqC 2.0 command/response timing. |
| PC-Based Satellite Tuner Card | Professional Satellite Signal Distribution |
|
Use Scenario: Compact LNB power solution for PCIe/USB satellite tuner cards with space-constrained layouts. IC Role / Device Role / Timing Role: Integrates step-up converter, linear regulator, and I²C interface in PowerSO-20 - minimizes footprint and thermal spread. Use Value: Delivers 750mA output with 94% efficiency and ±4kV ESD tolerance - improves reliability in unshielded PC environments. |
Use Scenario: Centralized LNB powering in headend or commercial distribution systems with long coaxial runs. IC Role / Device Role / Timing Role: Applies LLC bit to boost output to 19.5V, compensating for >50m cable voltage drop per EIA/TIA-568-C.2. Use Value: Maintains LNB bias stability across extended installations - prevents signal loss and intermittent lock failures. |
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 |
|---|---|---|---|
| MAX2181A | Integrated LNB bias controller with 22kHz tone generator; no built-in step-up converter - requires external DC/DC | Lacks DiSEqC 2.0 tone detection and VORX/VOTX dual-output architecture; limited to DiSEqC 1.x | Choose when external step-up stage already exists and DiSEqC 2.0 is not required. |
| SP2102 | Single-chip LNB supply with integrated step-up and tone generator; only 450mA max output; no I²C diagnostics | No OLF/OTF flags, no LLC compensation, no PCL mode - lacks telemetry and cable-drop adaptation | Choose for cost-sensitive DiSEqC 1.x designs where diagnostics and voltage compensation are unnecessary. |
Compared with MAX2181A and SP2102, the LNBH21PD uniquely combines integrated step-up conversion, DiSEqC 2.0 bidirectional support, I²C-accessible diagnostics, and programmable cable compensation - making it the only option suitable for high-reliability, feature-rich satellite receiver platforms requiring full EUTELSAT/DiSEqC 2.0 compliance.
Availability
LNBH21PD is available at Aetrix Electronics and suitable for satellite STB receivers, digital TV tuners, and professional multiswitch systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LNBH21PD 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 strong focus on energy efficiency and system integration.
The LNBH21PD belongs to ST's LNBP (LNB Power) product line, designed specifically for satellite receiver front-ends - emphasizing high-efficiency power delivery, DiSEqC protocol compliance, and robust operation in RF-noise-prone environments.
FAQ
What is the purpose of the VOTX and VORX pins?
VOTX and VORX are separate output pins enabling DiSEqC 2.0 bidirectional operation: VOTX delivers 13/18V + 22kHz tone directly to the LNB (bypassing the R-L filter), while VORX supplies regulated voltage through the filter during tone reception. This separation prevents tone distortion caused by R-L impedance and ensures clean PWK signal recovery.
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 13.25V or 18V output, raising it to 14.25V or 19.5V respectively. This compensates for IR drop across long coaxial cables - meeting American LNB standards and ensuring stable LNB bias at distances up to 50 meters.
Can the LNBH21PD operate without an external MOSFET?
No. The LNBH21PD requires an external N-channel MOSFET connected to the GATE pin to implement its step-up converter. The IC drives the gate but does not integrate the power switch; recommended devices include STN4NF03L or STS4DNFS30L per the application circuit.
What protection features are accessible via I²C diagnostics?
The System Register exposes two diagnostic bits: OTF (Over-Temperature Flag) goes HIGH when junction temperature exceeds 150°C, and OLF (Over-Load Flag) indicates active current limiting. Both are readable in real time, enabling firmware-based thermal and overload response without additional sensors.
LNBH21PD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.433", 11.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for LNBH21PD through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH21PD 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 reliable?
The price and inventory of LNBH21PD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH21PD is usually 5 days.
3.What payment methods are accepted for LNBH21PD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH21PD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH21PD?
LNBH21PD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH21PD 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?
For technical support, including LNBH21PD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH21PD requirements.
6.How does Aetrix verify that LNBH21PD is sourced from the original manufacturer or authorized distributors?
All LNBH21PD 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 meets industry standards.
7.What is the process for return or replacement of LNBH21PD?
All LNBH21PD units undergo pre-shipment inspection (PSI). If there is an issue with LNBH21PD, 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 part is unused and in its original packaging.
Return procedure for LNBH21PD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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