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STMicroelectronics LNBH29PTR
- Part No.:
- LNBH29PTR
- Manufacturer:
- STMicroelectronics
- Category:
- Power Management - Specialized
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
LNBH29PTR.pdf
- Description:
- IC LNB CTRL STEP-UP I2C
- Quantity:
- Payment:
- Shipping:
Inventory:3,889
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Product details
Overview
LNBH29PTR from STMicroelectronics is a monolithic LNB supply and control IC with integrated step-up DC-DC converter and I²C interface, designed for satellite receiver front-end power and signaling. It delivers 13/18 V DC output with selectable current limit (up to 550 mA), generates compliant 22 kHz tone for DiSEqC™ communication, and features built-in overload, overtemperature, and short-circuit protection. Used in STB, TV, and PC card satellite receivers.
For engineers reviewing the LNBH29PTR datasheet, LNBH29PTR pinout, LNBH29PTR application, or LNBH29PTR equivalent, this device serves as a complete LNB interface solution-replacing discrete regulators, tone generators, and protection circuitry-with QFN16 (3×3) packaging, I²C programmability, and diagnostic register visibility for system-level fault monitoring.
Technical Context
The LNBH29PTR integrates a high-efficiency PWM step-up converter (93% typical at 0.5 A) feeding a low-drop linear post-regulator, maintaining VUP − VOUT ≈ 1 V to minimize power dissipation. Its internal 22 kHz tone generator is factory-trimmed for DiSEqC™ compliance and remains stable even under no-load conditions.
Control and diagnostics are fully I²C-based: output voltage (13/18 V) is set via 3-bit DATA register; five STATUS register bits report VMON (output voltage), PDO (pull-down overcurrent), PNG (input undervoltage), OLF (overload), and OTF (overtemperature); dynamic short-circuit protection cycles 90 ms ON / 900 ms OFF to limit thermal stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Programmable 13 V or 18 V via I²C DATA register - enables single hardware design for universal LNB polarity selection. |
| Max Output Current | Up to 550 mA (set by external RSEL on ISEL pin) - supports high-current LNBs and multi-switch boxes without external current boost. |
| Step-up Efficiency | 93% typical at 0.5 A load - reduces heat generation and allows compact thermal design in space-constrained STB PCBs. |
| 22 kHz Tone Accuracy | Factory-trimmed ±1.5% frequency tolerance - ensures reliable DiSEqC™ command transmission per EN 50494 standard. |
| ESD Rating (VOUT) | ±4 kV HBM on output power pins - provides robustness against antenna cable surge transients without additional TVS. |
| Thermal Shutdown | 150 °C junction temperature threshold with automatic recovery - protects against sustained overload while preserving system uptime. |
| I²C Address Options | Two configurable addresses via ADDR pin (0x20 or 0x21) - enables dual-LNB control on same bus without address conflict. |
Pinout & Package
Package: QFN16 (3 mm × 3 mm, 0.5 mm pitch), exposed thermal pad (Epad) connected to PGND for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | LNB output port | Low-drop linear regulator output delivering 13/18 V DC + superimposed 22 kHz tone - directly drives coaxial cable to LNB. |
| VCC | DC input supply | 8–17.5 V primary supply - powers entire IC; includes 4.7 V UVLO for safe startup and brownout immunity. |
| LX | Boost switch node | Drain of integrated N-MOSFET - connects to external inductor and Schottky diode to form step-up converter stage. |
| PGND | Power ground | Dedicated ground for DC-DC converter - must be tied directly to Epad to minimize switching noise and thermal resistance. |
| SDA / SCL | I²C bidirectional interface | Standard 2-wire bus for configuration (voltage, COMP bit), status readback (VMON, OLF, OTF), and diagnostics. |
| ISEL | Current limit programming | Connects to GND via resistor RSEL (kΩ) to set IMAX = 13915 / RSEL mA - enables precise current tailoring per LNB load. |
| DSQIN | DiSEqC envelope input | TTL-compatible logic input - activates internal 22 kHz generator with <6 µs delay; used only on LNBH29 (not LNBH29E). |
| ADDR | I²C address select | Logic-high or -low sets I²C slave address to 0x20 or 0x21 - allows two devices on same bus for dual-LNB systems. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated step-up + linear regulation | Eliminates need for external boost controller and pass transistor - reduces BOM count by ≥7 components vs discrete solution. |
| Dynamic short-circuit protection | 90 ms ON / 900 ms OFF cycling limits average power dissipation to <0.5 W during sustained fault - avoids thermal shutdown lockout. |
| 22 kHz tone integrity at no load | Guaranteed waveform fidelity without external loading - removes need for dummy resistive load on VOUT for tone stability. |
| I²C-accessible diagnostics | Five real-time STATUS bits (VMON, PDO, PNG, OLF, OTF) enable firmware-driven LNB health monitoring and graceful error handling. |
| COMP bit for capacitor optimization | Single I²C bit selects compensation for ceramic (COMP=1) or electrolytic (COMP=0) output capacitors - simplifies layout across capacitor types. |
Applications
| STB Satellite Receiver | TV Satellite Receiver |
|---|---|
Use Scenario: Integrated digital satellite set-top box requiring dual-polarity LNB control and DiSEqC™ switching. IC Role / Device Role / Timing Role: Primary LNB power supply and 22 kHz tone generator; interfaces with main SoC via I²C for voltage selection and fault reporting. Use Value: Enables single-board LNB interface with programmable 13/18 V, real-time overcurrent detection, and <6 µs tone activation latency for responsive DiSEqC™ commands. |
Use Scenario: Flat-panel satellite TV with built-in tuner, supporting multiple LNB inputs and motorized dish control. IC Role / Device Role / Timing Role: High-reliability LNB driver with thermal protection and no-load tone stability - critical for unattended operation. Use Value: Delivers 550 mA continuous current with 93% efficiency, reducing heatsink requirements and enabling fanless TV chassis designs. |
| PC Card Satellite Receiver | Multi-Switch Distribution Hub |
Use Scenario: PCIe or ExpressCard-based satellite tuner for laptops/desktops with space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact LNB interface in QFN16 (3×3) package; handles 12 V input and generates clean 22 kHz tone without external filtering. Use Value: QFN16 (3×3) footprint saves >30% board area vs legacy SOIC solutions; Epad thermal path sustains 500 mA at 70 °C ambient. |
Use Scenario: Indoor multi-switch box distributing signal from single dish to 4–8 receivers, each requiring independent LNB control. IC Role / Device Role / Timing Role: LNB driver with I²C address flexibility (ADDR pin) and dynamic overload recovery - prevents cascade failure across ports. Use Value: Dual-address support (0x20/0x21) allows up to 2 LNBH29PTRs per bus; OLF cycling maintains partial functionality during one-port fault. |
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+ | Higher max output current (600 mA), but requires external 22 kHz oscillator and separate protection ICs - no integrated tone generator or diagnostics. | Used in high-end professional satellite receivers where external tone precision is prioritized over integration. | Select when absolute 22 kHz frequency accuracy (<±0.5%) is required and board space permits discrete tone generation. |
| LMX2531LQ1770E/NOPB | RF synthesizer IC - not an LNB supply IC; lacks DC-DC, linear regulator, VOUT, or DiSEqC™ functions entirely. | Not applicable - misaligned function scope; intended for RF local oscillator synthesis, not LNB power/signaling. | Avoid - functional mismatch; does not replace LNBH29PTR's power delivery, tone generation, or protection roles. |
Compared with MAX2181AETL+, LNBH29PTR trades marginal current headroom for full integration (tone gen, diagnostics, protection), reducing component count and firmware complexity; unlike LMX2531, it is a purpose-built LNB interface-not a general-purpose RF IC-and delivers verified DiSEqC™ compliance out-of-box.
Availability
LNBH29PTR is available at Aetrix Electronics and suitable for STB satellite receivers, TV satellite receivers, and PC card satellite receivers requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LNBH29PTR 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 microcontroller solutions for automotive, industrial, and consumer markets.
The LNBH29 series belongs to ST's broadcast and satellite interface product line, engineered specifically to consolidate LNB power, DiSEqC™ signaling, and protection into a single monolithic IC for cost-sensitive, high-volume satellite receiver designs.
FAQ
What is the maximum allowable input voltage for LNBH29PTR?
The absolute maximum VCC rating is 20 V, but the recommended operating range is 8 V to 17.5 V per the datasheet. Operation above 17.5 V risks exceeding internal voltage limits on the step-up controller and may trigger premature UVLO or reduce long-term reliability. For 12 V nominal systems, transient spikes up to 17.5 V are safely tolerated without derating.
Can LNBH29PTR generate both 13 V and 18 V simultaneously?
No - the output voltage is digitally selected via I²C register bits to be either 13 V or 18 V, not both. The IC has a single VOUT pin and one linear regulator; polarity switching is achieved by reprogramming the DATA register between channel changes. Simultaneous dual-voltage output requires two separate LNBH29PTRs or a multi-output controller.
How is the 22 kHz tone generated on LNBH29PTR?
The LNBH29PTR uses an internal, factory-trimmed 22 kHz oscillator whose output is superimposed onto the VOUT DC voltage via the linear regulator control loop. Activation is triggered by a TTL HIGH on DSQIN (for LNBH29 variants), with <6 µs propagation delay. Tone waveform integrity is guaranteed even with no external load on VOUT.
Does LNBH29PTR require external surge protection on VOUT?
While LNBH29PTR includes ±4 kV HBM ESD tolerance on VOUT, it does not replace dedicated TVS protection against lightning-induced surges on antenna cables. ST recommends pairing it with LNBTVSxx series TVS diodes (e.g., LNBTVS03) placed at the coaxial connector to clamp transients before they reach the IC - essential for field reliability in outdoor installations.
LNBH29PTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Low-Noise Block (LNB) Down-Converter
- Current - Supply:
- 10mA
- Voltage - Supply:
- 8V ~ 17.5V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LNBH29PTR FAQ
1.How can I place an order for LNBH29PTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH29PTR 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 LNBH29PTR reliable?
The price and inventory of LNBH29PTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH29PTR is usually 5 days.
3.What payment methods are accepted for LNBH29PTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH29PTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH29PTR?
LNBH29PTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH29PTR 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 LNBH29PTR?
For technical support, including LNBH29PTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH29PTR requirements.
6.How does Aetrix verify that LNBH29PTR is sourced from the original manufacturer or authorized distributors?
All LNBH29PTR 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 LNBH29PTR meets industry standards.
7.What is the process for return or replacement of LNBH29PTR?
All LNBH29PTR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH29PTR, 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 LNBH29PTR part is unused and in its original packaging.
Return procedure for LNBH29PTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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