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STMicroelectronics LNBH221PD
- Part No.:
- LNBH221PD
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Datasheet:
-
LNBH221PD.pdf
- Description:
- IC REG CONV SAT 2OUT POWERSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
LNBH221PD from STMicroelectronics is a dual-channel LNB supply and control IC for satellite TV receivers, integrating independent 13/18 V DC-DC regulators, 22 kHz tone generation/detection, I²C interface, and DiSEqC™ 2.0 support per channel. It delivers up to 500 mA per output, achieves 93% typical efficiency at 500 mA, and features built-in overload/over-temperature protection with I²C diagnostic bits. Used in dual-LNB STB designs and multiswitch boxes.
For engineers reviewing the LNBH221PD datasheet, LNBH221PD pinout, LNBH221PD application, or LNBH221PD equivalent, key selection criteria include dual independent DiSEqC™ 2.0 compliance, 22 kHz tone start-up speed, SOA short-circuit protection behavior, and I²C register-level control of voltage select (VSEL), tone enable (TEN), and pulsed current limiting (PCL).
Technical Context
The LNBH221PD implements two fully independent channels (A and B), each with a high-efficiency step-up PWM controller feeding a semi-low-drop linear post-regulator. The architecture maintains VUP − VOUT ≈ 2 V (typ.) to minimize power loss, enabling 1 W typical dissipation at 500 mA load.
Each channel integrates a factory-trimmed 22 kHz oscillator and a dedicated tone detector with AC-coupled DETIN and open-drain DSQOUT, supporting bi-directional DiSEqC™ 2.0 via separate VOTX (transmit) and VORX (receive) outputs to bypass R-L filter distortion. Control is exclusively via 8-bit I²C system register with six writable bits and two read-only diagnostic flags (OTF, OLF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current per channel | Guaranteed 500 mA - supports standard LNBs and multiswitch loads without external boost. |
| Step-up efficiency | 93% typ. @ 500 mA - reduces thermal stress and enables compact thermal design in PowerSO-36 package. |
| 22 kHz tone accuracy | Factory-trimmed to EUTELSAT standards - eliminates need for external calibration or tuning components. |
| Short-circuit protection | SOA-limited: 300 mA @ 13 V / 200 mA @ 18 V - limits junction temperature rise during fault conditions. |
| Thermal shutdown | Triggers at TJ ≥ 150 °C (typ.), resumes at 140 °C - prevents permanent damage under sustained overload. |
| I²C address options | Four selectable addresses via ADDR pin - allows co-location of up to four LNBH221PDs on same bus. |
| UVLO threshold | 6.7 V (typ.) - disables regulator blocks below safe input voltage, preventing erratic LNB behavior. |
Pinout & Package
Package: PowerSO-36 - thermally enhanced exposed die-pad package with RthJC = 2 °C/W, optimized for high-current LNB supply applications requiring efficient heat transfer to PCB ground plane.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC (A:8, B:26) | Supply input | 8–15 V main supply; requires 220 µF + 470 nF parallel decoupling for stable step-up operation. |
| GATE (A:7, B:25) | External MOSFET gate driver | Drives external N-channel MOSFET in step-up converter; ±400 mA peak drive capability. |
| SENSE (A:6, B:24) | Current sense input | Connects to 0.1 Ω sense resistor; enables SOA current limiting and diagnostics. |
| VUP (A:9, B:27) | Step-up output / pre-regulator input | Intermediate rail fed to linear post-regulator; internal control keeps VUP − VOUT ≈ 2 V. |
| VOTX (A:30, B:12) | Tone transmit output | Active during DiSEqC™ 2.0 TX; bypasses R-L filter to deliver clean 22 kHz + 13/18 V to LNB. |
| VORX (A:28, B:10) | Tone receive output | Active during DiSEqC™ 2.0 RX; routes 13/18 V through R-L filter while isolating tone path. |
| DSQIN (A:4, B:22) | DiSEqC™ data input | Accepts encoded DiSEqC™ commands when TEN = 0; modulates internal 22 kHz carrier. |
| DETIN (A:35, B:17) | Tone detector input | AC-coupled input for bidirectional DiSEqC™ 2.0; extracts PWK data from coaxial bus. |
| DSQOUT (A:5, B:23) | Tone detector output | Open-drain output signaling tone presence to MCU; active-low pulse synchronized to detected 22 kHz. |
| SDA/SCL (A:2,3 / B:20,21) | I²C interface | Dual independent buses - enables simultaneous, isolated configuration of both channels. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent DiSEqC™ 2.0 channels | Separate VOTX/VORX pins per channel eliminate tone distortion from R-L filter insertion loss. |
| Pulsed current limiting (PCL) | Configurable via I²C bit; cycles output OFF for 900 ms then ON for 90 ms to reduce average fault power. |
| LLC voltage compensation | +1 V (VSEL=0) or +1.5 V (VSEL=1) boost - meets US LNB standards (19.5 V) and compensates coax drop. |
| Fast 22 kHz oscillator start-up | Enables reliable DiSEqC™ encoding within tight timing windows required by protocol layer. |
| Integrated thermal & overload diagnostics | OTF and OLF bits in I²C register provide real-time fault status without external monitoring circuitry. |
Applications
| Dual-LNB Satellite STB | Multiswitch Power Hub |
|---|---|
|
Use Scenario: Consumer satellite set-top box with two independent LNB inputs (e.g., twin-tuner PVR). IC Role / Device Role / Timing Role: Dual-channel LNB power manager providing 13/18 V selection, 22 kHz tone, and DiSEqC™ 2.0 command routing per tuner. Use Value: Eliminates discrete DC-DC + tone generator + logic circuits; reduces BOM count by >12 components per channel. |
Use Scenario: Centralized multiswitch unit powering up to 16 LNBs across multiple satellite positions. IC Role / Device Role / Timing Role: Independent channel control enables selective powering and addressing of individual LNB groups via I²C. Use Value: Enables scalable, software-configurable LNB management without manual jumpering or hardware rework. |
| PCMCIA Satellite Tuner Card | Professional DiSEqC™ Test Equipment |
|
Use Scenario: Compact PCMCIA/ExpressCard satellite tuner for laptops or field-deployable receivers. IC Role / Device Role / Timing Role: Single-chip LNB interface delivering regulated power and bidirectional DiSEqC™ 2.0 over shared coax line. Use Value: Meets strict size and thermal constraints (<1.5 W total dissipation) while maintaining full protocol compliance. |
Use Scenario: Benchtop DiSEqC™ analyzer verifying LNB response, tone accuracy, and command timing. IC Role / Device Role / Timing Role: Reference-grade 22 kHz generator/detector with programmable VSEL, TEN, and TTX bits for stimulus control. Use Value: Provides traceable, repeatable DiSEqC™ signal generation and detection without external signal sources. |
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 |
|---|---|---|---|
| MAX2181A | Single-channel only; no integrated DiSEqC™ 2.0 tone detector; requires external 22 kHz oscillator. | Limited to single-LNB or multi-chip implementations; lacks VORX/VOTX separation for distortion-free tone routing. | Select only when dual-channel integration is not required and external tone generation is acceptable. |
| SP2102 | Fixed 13/18 V outputs; no I²C interface; no DiSEqC™ support; no SOA protection or diagnostics. | Suitable only for basic analog LNBs without remote switching or protocol communication. | Choose only for cost-sensitive, non-DiSEqC™ legacy systems where firmware control and diagnostics are unnecessary. |
Compared with MAX2181A and SP2102, the LNBH221PD uniquely delivers dual-channel, fully integrated DiSEqC™ 2.0 transceivers with I²C-configurable protection, voltage compensation, and thermal diagnostics - enabling single-chip compliance with modern satellite receiver standards.
Availability
LNBH221PD is available at Aetrix Electronics and suitable for dual-LNB STBs, multiswitch hubs, PCMCIA satellite tuners, and DiSEqC™ test equipment requiring stable component supply and long-term design continuity.
Supply support for LNBH221PD 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 specializing in power management, automotive, and industrial ICs, with broad expertise in satellite and broadcast infrastructure solutions.
The LNBH221PD belongs to ST's LNB supply and control product line, designed specifically to consolidate power regulation, tone generation, DiSEqC™ interface, and diagnostics into a single IC for next-generation satellite receiver platforms.
FAQ
What is the maximum continuous output current per channel?
The LNBH221PD guarantees 500 mA per channel under thermal conditions defined in the datasheet (TJ ≤ 125 °C). This rating is validated with the recommended external components, including the 0.1 Ω sense resistor and specified inductor (22 µH). Exceeding this current triggers SOA current limiting, reducing output to 300 mA (13 V) or 200 mA (18 V) to protect the device.
How does the VOTX/VORX pin separation improve DiSEqC™ 2.0 performance?
VOTX and VORX provide physically separate paths for transmit and receive functions: VOTX delivers unfiltered 22 kHz + DC to the LNB during command transmission, avoiding attenuation from the mandatory R-L filter; VORX supplies filtered 13/18 V during reception, preserving signal integrity on the shared coax line. This separation ensures <±0.5% tone amplitude variation and meets EUTELSAT-defined DiSEqC™ 2.0 spectral purity requirements.
Can the LNBH221PD operate from a 12 V supply only?
Yes - the integrated step-up controller accepts 8–15 V input, making 12 V the most common and optimal supply voltage. At 12 V input and 500 mA load, the device achieves 93% typical efficiency and dissipates only ~1 W. Operation below 8 V is blocked by the 6.7 V UVLO circuit; operation above 15 V violates absolute maximum ratings and risks damage.
What diagnostic information is available via I²C?
The 8-bit system register provides two real-time diagnostic flags: OTF (Over-Temperature Flag) and OLF (Over-Load Flag), both read-only. OTF asserts when junction temperature exceeds 150 °C; OLF asserts during SOA current limit activation or pulsed current limiting cycles. These bits allow firmware to log faults, trigger alerts, or initiate graceful shutdown without external sensors.
LNBH221PD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Converter, Analog and Digital Satellite STB Receivers/SatTV
- Voltage - Input:
- 8V ~ 15V
- Number of Outputs:
- 2
- Voltage - Output:
- 13.3V, 18V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerSO-36, Bottom Pad
LNBH221PD FAQ
1.How can I place an order for LNBH221PD through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH221PD 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 LNBH221PD reliable?
The price and inventory of LNBH221PD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH221PD is usually 5 days.
3.What payment methods are accepted for LNBH221PD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH221PD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH221PD?
LNBH221PD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH221PD 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 LNBH221PD?
For technical support, including LNBH221PD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH221PD requirements.
6.How does Aetrix verify that LNBH221PD is sourced from the original manufacturer or authorized distributors?
All LNBH221PD 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 LNBH221PD meets industry standards.
7.What is the process for return or replacement of LNBH221PD?
All LNBH221PD units undergo pre-shipment inspection (PSI). If there is an issue with LNBH221PD, 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 LNBH221PD part is unused and in its original packaging.
Return procedure for LNBH221PD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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