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STMicroelectronics LNBH221PD-TR
- Part No.:
- LNBH221PD-TR
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 36-PowerBSSOP (0.433", 11.00mm Width)
- Datasheet:
-
LNBH221PD-TR.pdf
- Description:
- IC REG CONV SAT 2OUT POWERSO-36
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
LNBH221PD-TR 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% step-up efficiency at 500 mA, and features built-in SOA short-circuit protection, overtemperature shutdown (150 °C), and ±4 kV ESD tolerance on power pins - deployed in analog/digital STB, PCMCIA satellite cards, and multiswitch boxes.
For engineers reviewing the LNBH221PD-TR datasheet, LNBH221PD-TR pinout, LNBH221PD-TR application, or LNBH221PD-TR equivalent, key selection criteria include dual independent DiSEqC™ 2.0 compliance, I²C-configurable voltage select (13/18 V + LLC boost), TTX-controlled VOTX/VORX switching for tone-transparent R-L filtering, and integrated 22 kHz oscillator/detector with fast start-up for DiSEqC™ encoding.
Technical Context
The LNBH221PD-TR 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 - maintaining VUP − VOUT ≈ 2 V typ. to minimize thermal dissipation. Each channel supports selectable 13 V or 18 V output via I²C VSEL bit, with optional +1 V / +1.5 V LLC compensation for coaxial cable drop.
Each section integrates a factory-trimmed 22 kHz oscillator (TEN-controlled), a 22 kHz tone detector (DETIN/DSQOUT), and dedicated TX/RX output pins (VOTX/VORX) enabling lossless DiSEqC™ 2.0 bidirectional signaling through external R-L filters. Protection logic includes pulsed current limiting (PCL bit), overload flag (OLF), and overtemperature flag (OTF), all readable via I²C system register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current per channel | Guaranteed 500 mA - supports high-power LNBs and multiswitch loads without external boost. |
| Step-up efficiency | 93 % typ. @ 500 mA - reduces thermal load and enables compact heatsinking in PowerSO-36 package. |
| 22 kHz oscillator accuracy | Factory-trimmed to EUTELSAT/DiSEqC™ standards - eliminates need for external crystal or calibration. |
| Voltage output options | 13 V / 18 V selectable via I²C VSEL; +1 V (VSEL=0) or +1.5 V (VSEL=1) via LLC bit - meets US 19.5 V LNB standard. |
| DiSEqC™ interface | Fully bidirectional DiSEqC™ 2.0 support per channel with dedicated VOTX (TX) and VORX (RX) pins - avoids tone distortion from R-L filter impedance during transmission. |
| Protection features | SOA short-circuit limit (200–300 mA), pulsed current limiting (TOFF = 900 ms), OT shutdown at 150 °C - enables robust field operation with diagnostic feedback via I²C flags. |
| ESD tolerance | ±4 kV HBM on VCC, VUP, VOTX, VORX - ensures reliability during board handling and in-cable surge events. |
Pinout & Package
Supplied in PowerSO-36 package - thermally enhanced exposed die-pad for junction-to-case RthJC = 2 °C/W, supporting high-current operation with minimal PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (pins 8, 26) | Supply input | 8–15 V main supply; internal UVLO disables circuit below 6.7 V - prevents erratic behavior during brownout. |
| GATE (pins 7, 25) | External MOSFET gate drive | Drives external N-channel MOSFET in step-up converter - enables high-efficiency boost from low-input rails. |
| SENSE (pins 6, 24) | Current sense input | Connects to 0.1 Ω shunt; enables SOA current limiting and dynamic pulsed protection - critical for short-circuit resilience. |
| VUP (pins 9, 27) | Step-up output / pre-regulator input | Intermediate rail fed to linear post-regulator; internal control maintains ~2 V dropout - minimizes linear stage power loss. |
| VOTX (pins 30, 12) | Tone transmission output | Active during DiSEqC™ TX; bypasses R-L filter to deliver clean 22 kHz + DC - eliminates tone attenuation/distortion. |
| VORX (pins 28, 10) | Tone reception output | Active during DiSEqC™ RX; passes DC + filtered tone through R-L network - satisfies DiSEqC™ 2.0 bus impedance requirements. |
| DSQIN (pins 4, 22) | DiSEqC™ data input | Accepts DiSEqC™ command stream when TEN = 0 - enables immediate tone modulation without I²C latency. |
| DETIN (pins 35, 17) | Tone detection input | AC-coupled 22 kHz detector input - extracts DiSEqC™ return data from LNB side for full-duplex communication. |
| DSQOUT (pins 5, 23) | Tone detection output | Open-drain PWK output reporting detected tone presence - directly interfaces microcontroller GPIO for DiSEqC™ decoding. |
| SDA/SCL (pins 2/3, 20/21) | I²C interface | Standard 2-wire bus per channel - allows independent configuration and diagnostics of A/B sections from single host controller. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent DiSEqC™ 2.0 channels | Separate VOTX/VORX, DETIN/DSQOUT, and I²C interfaces per section - enables simultaneous control of two LNBs or one LNB + multiswitch. |
| I²C-configurable voltage + LLC boost | VSEL selects 13/18 V; LLC adds +1 V or +1.5 V - ensures stable LNB bias over long coax runs and complies with North American 19.5 V spec. |
| TTX-gated output switching | TTX bit enables/disables VOTX independently of VORX - allows precise timing control of tone transmission window and seamless RX/TX handover. |
| Pulsed current limiting (PCL) | Configurable TOFF = 900 ms / TON = 90 ms cycle - reduces average power dissipation during sustained shorts while preserving startup capability. |
| Integrated 22 kHz oscillator & detector | No external crystal or RC network required - factory-trimmed oscillator starts in <100 µs, enabling fast DiSEqC™ command response. |
Applications
| Direct Broadcast Satellite STB | Dual-LNB Multiswitch Controller |
|---|---|
|
Use Scenario: Consumer satellite set-top box receiving signals from two orbital positions (e.g., 19.2°E and 28.2°E) using a monoblock LNB or twin-feed dish. IC Role / Device Role / Timing Role: Dual-channel LNB power manager providing independent 13/18 V bias and 22 kHz tone to each LNB, with I²C arbitration between tuner ICs. Use Value: Eliminates need for discrete DC-DC + tone generator + protection circuits - reduces BOM count by >12 components and PCB area by 35%. |
Use Scenario: Indoor multiswitch unit distributing satellite signals to multiple rooms, requiring independent power and DiSEqC™ control per output port. IC Role / Device Role / Timing Role: Centralized LNB interface IC powering and commanding up to two downstream LNBs while relaying DiSEqC™ commands bidirectionally. Use Value: Enables single-chip control of dual-output multiswitches with full DiSEqC™ 2.0 echo cancellation - supports daisy-chained installations without signal degradation. |
| PCMCIA Satellite Tuner Card | Professional Satellite Monitoring System |
|
Use Scenario: Laptop-based satellite signal analyzer or portable DVB-S receiver using PCMCIA form factor with tight thermal and space constraints. IC Role / Device Role / Timing Role: Compact dual-LNB supply IC delivering regulated 13/18 V and 22 kHz tone within PowerSO-36 footprint - optimized for low-profile card stacking. Use Value: Achieves 500 mA/channel output in 10.5 × 12.5 mm package with RthJC = 2 °C/W - enables fanless operation even at 45 °C ambient. |
Use Scenario: Headend monitoring system verifying LNB health, DiSEqC™ responsiveness, and signal integrity across large antenna farms. IC Role / Device Role / Timing Role: Programmable LNB test interface generating calibrated 13/18 V, injecting/monitoring 22 kHz tone, and reporting OLF/OTF faults via I²C. Use Value: Provides real-time diagnostic bits (OLF, OTF, PCL status) and configurable SOA limits - replaces manual multimeter + tone injector workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual LNB supply and DiSEqC™ control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX2181AETL+ | Single-channel only; requires two ICs for dual-LNB; no integrated 22 kHz detector; relies on external tone generator. | Lacks native DiSEqC™ 2.0 bidirectional support - needs additional comparator and logic for RX path. | Choose only if existing design uses MAXIM platform and dual-channel integration is not required. |
| SP2181A | Fixed 13/18 V outputs; no I²C interface; no LLC boost; no pulsed current limiting - purely analog control. | Requires discrete microcontroller GPIOs and external tone circuitry - increases layout complexity and reduces configurability. | Select only for cost-sensitive, non-upgradable STB designs where firmware flexibility is unnecessary. |
Compared with MAX2181AETL+ and SP2181A, the LNBH221PD-TR uniquely integrates dual independent DiSEqC™ 2.0 transceivers, I²C-configurable LLC compensation, and pulsed SOA protection - reducing component count by ≥40% and enabling field-upgradable LNB control firmware.
Availability
LNBH221PD-TR is available at Aetrix Electronics and suitable for satellite TV set-top boxes, PCMCIA satellite tuner cards, and multiswitch controllers requiring stable component supply, long-lifecycle support, and full DiSEqC™ 2.0 compliance.
Supply support for LNBH221PD-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, Switzerland, designing and manufacturing analog, MCU, power, and automotive ICs with focus on energy efficiency and system integration.
The LNBH221PD-TR belongs to ST's satellite front-end power management product line, engineered specifically for low-noise, high-reliability LNB interfacing in consumer and professional broadcast equipment.
FAQ
What is the maximum continuous output current per channel?
The LNBH221PD-TR guarantees 500 mA per channel under thermal conditions meeting RthJC ≤ 2 °C/W and ambient ≤ 70 °C. At 500 mA, typical power loss is 0.56 W per channel due to optimized step-up + linear regulation architecture. Exceeding this current triggers SOA current limiting, with clamp levels of 200 mA (18 V) or 300 mA (13 V).
How does the VOTX/VORX pin separation improve DiSEqC™ 2.0 performance?
VOTX delivers unfiltered 22 kHz + DC directly to the LNB during transmission, avoiding attenuation from the mandatory DiSEqC™ 2.0 R-L filter. VORX routes the same DC through the filter during reception, satisfying bus impedance requirements. This separation eliminates tone distortion and ensures reliable bi-directional communication - confirmed by EUTELSAT-compliant test setups in ST Application Note AN2725.
Can the LNBH221PD-TR operate from a 12 V supply only?
Yes - the integrated step-up controller accepts 8–15 V input (VCC), making 12 V nominal operation fully supported. At 12 V/500 mA, typical efficiency is 93%, and the internal pre-regulator maintains VUP at ~19.5 V to sustain 18 V output with 2 V dropout. No external boost stage is needed, simplifying power architecture versus discrete solutions.
What diagnostic information is available via I²C?
The 8-bit system register provides real-time readout of OTF (overtemperature flag), OLF (overload flag), and two reserved diagnostic bits. OTF asserts at 150 °C junction temperature and clears at 140 °C; OLF sets when SOA current limit is reached or PCL cycles detect persistent overload. Both flags persist until cleared by host software after fault removal.
LNBH221PD-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 36-PowerBSSOP (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:
- 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-TR FAQ
1.How can I place an order for LNBH221PD-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH221PD-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 LNBH221PD-TR reliable?
The price and inventory of LNBH221PD-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH221PD-TR is usually 5 days.
3.What payment methods are accepted for LNBH221PD-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH221PD-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH221PD-TR?
LNBH221PD-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH221PD-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 LNBH221PD-TR?
For technical support, including LNBH221PD-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH221PD-TR requirements.
6.How does Aetrix verify that LNBH221PD-TR is sourced from the original manufacturer or authorized distributors?
All LNBH221PD-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 LNBH221PD-TR meets industry standards.
7.What is the process for return or replacement of LNBH221PD-TR?
All LNBH221PD-TR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH221PD-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 LNBH221PD-TR part is unused and in its original packaging.
Return procedure for LNBH221PD-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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