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STMicroelectronics LNBH25LSPQR
- Part No.:
- LNBH25LSPQR
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
LNBH25LSPQR.pdf
- Description:
- IC REG CONV SAT TV 1OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:478
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Product details
Overview
LNBH25LSPQR from STMicroelectronics is a monolithic LNB supply and control IC for satellite receiver front-ends, integrating a high-efficiency step-up DC-DC converter (93% @ 0.5 A), low-drop post-regulator, and I²C-controlled 13/18 V output with programmable 22 kHz tone generation. It delivers precise voltage selection across 15 levels, supports DiSEqC 1.x envelope or TTL tone encoding, and includes dynamic short-circuit protection and ±4 kV ESD tolerance on VOUT for antenna cable interface.
For engineers reviewing the LNBH25LSPQR datasheet, LNBH25LSPQR pinout, LNBH25LSPQR application, or LNBH25LSPQR equivalent, key selection criteria include I²C-configurable output voltage/current limits, integrated 22 kHz tone integrity at no-load, soft-start timing (4–6 ms), thermal/overload diagnostics via status registers, and QFN24L (4×4 mm) package compatibility with satellite STB PCB layouts.
Technical Context
The LNBH25LSPQR implements a two-stage power architecture: a PWM-based boost converter (VCC = 8–16 V → VUP) feeding an ultra-low-drop linear regulator (VUP → VOUT), maintaining VUP−VOUT ≈ 1 V typ. to minimize dissipation. Its I²C interface (7-bit address selectable via ADDR pin) provides full register-level control of output voltage (4-bit VSEL), tone mode (EXTM/TEN bits), current limit (via ISEL resistor), and protection behavior (PCL, OLR, THERM).
DiSEqC signaling is supported through three configurable paths: internal tone generator (TEN=1, EXTM=0), external 22 kHz TTL input (EXTM=1), or DiSEqC envelope modulation on DSQIN. Protection logic latches diagnostic flags (OTF, OLF, PNG) in Status1 register until cleared by read operation, enabling robust fault logging in embedded satellite receivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | 13 V / 18 V selectable via I²C data1 register; 15 discrete levels per standard LNB requirements. |
| Max Output Current | 750 mA typical; set externally via resistor on ISEL pin (ILIM = 750 mA / RSEL(kΩ) × 10). |
| Step-up Efficiency | 93% typical at 0.5 A load; enables single 12 V supply operation with <0.5 W dissipation. |
| Tone Generation | Factory-trimmed 22 kHz waveform; rise/fall time and amplitude internally controlled; no-load integrity guaranteed. |
| ESD Rating | ±4 kV HBM on VOUT pin; protects against lightning-induced surges on coaxial antenna cable interface. |
| Thermal Shutdown | 150 °C junction threshold; disables both boost and LDO stages; OTF bit set in Status1 register. |
| I²C Address | Two options (0x20 or 0x21) selected by ADDR pin logic level; supports multi-device bus configuration. |
Pinout & Package
Package: QFN24L (4 × 4 mm, 0.5 mm pitch), thermally enhanced with exposed power pad (PGND-connected). Pin 4 (PGND) and pins 2,15,18,19,23 (GND) must be soldered to the exposed pad for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 3 (LX) | NMOS drain | Switch node of integrated 100 V/1.5 A power NMOS; connects to boost inductor and flyback diode. |
| 6 (ADDR) | I²C address select | Logic-high or -low sets device address to 0x20 or 0x21; enables dual-device bus topology. |
| 7 (SCL), 8 (SDA) | I²C interface | Standard open-drain bidirectional bus interface; supports 100 kHz/400 kHz modes per spec. |
| 9 (ISEL) | Current limit setting | Analog input for external resistor; sets linear regulator current clamp threshold (up to 750 mA). |
| 16 (VBYP) | Bypass capacitor | Connects only to ceramic capacitor (not voltage/current source); filters internal pre-regulator noise. |
| 17 (VCC) | Main supply input | 8–16 V DC input; powers internal logic, boost controller, and gate drivers; UVLO at 4.7 V typ. |
| 20 (VOUT) | LNB output port | Final regulated 13/18 V output with superimposed 22 kHz tone; ±4 kV ESD protected. |
| 21 (VUP) | Boost output | Intermediate rail fed to LDO pass transistor; monitored to maintain 1 V dropout for efficiency. |
| 22 (DSQIN) | Tone/envelope input | Configurable as TTL 22 kHz input or DiSEqC envelope signal; function determined by EXTM/TEN bits. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boost + LDO architecture | Eliminates external pass transistor and discrete boost controller; reduces BOM count by ≥7 components. |
| Programmable 22 kHz tone activation | Three independent modes (internal generator, external TTL, DiSEqC envelope) enable flexible DiSEqC 1.x compliance. |
| Dynamic short-circuit protection | Pulsed current limiting (TON=90 ms / TOFF=900 ms) reduces average power dissipation during sustained faults. |
| I²C diagnostic register access | Status1 register provides real-time OTF, OLF, and PNG flags; latched until cleared by read operation. |
| Soft-start timing control | Fixed 4 ms (0→13 V) and 6 ms (0→18 V) ramp prevents inrush current; eliminates need for external soft-start circuitry. |
Applications
| Digital Satellite Set-Top Box (STB) | Hybrid TV-Satellite Receiver |
|---|---|
|
Use Scenario: Powering and controlling LNB in consumer-grade DVB-S2 STBs with multi-switch support. IC Role / Device Role / Timing Role: Primary LNB supply IC delivering 13/18 V and 22 kHz tone under I²C command from main MCU. Use Value: Enables single 12 V board supply, reduces thermal load vs. discrete solutions, and simplifies DiSEqC 1.x implementation via register writes. |
Use Scenario: Integrated satellite tuner module in smart TVs requiring simultaneous terrestrial and satellite signal reception. IC Role / Device Role / Timing Role: LNB interface IC providing fast voltage switching (13↔18 V) and tone burst generation synchronized to channel change. Use Value: Soft-start timing ensures clean LNB power-up without disrupting adjacent RF stages; ±4 kV ESD protects shared coaxial path. |
| PC-Based Satellite Tuner Card | Professional Satellite Monitoring Terminal |
|
Use Scenario: Low-profile PCIe or USB satellite tuner card for PC-based DVB-S reception and recording. IC Role / Device Role / Timing Role: Compact LNB power manager with minimal footprint (QFN24L) and I²C-configurable current limit for varying LNB loads. Use Value: External ISEL resistor allows tuning max current to match specific LNB draw (e.g., 450 mA for low-power LNBs), optimizing efficiency. |
Use Scenario: Field-deployable satellite signal analyzer used in broadcast uplink verification and antenna alignment. IC Role / Device Role / Timing Role: Robust LNB driver with diagnostic visibility (OTF/OLF/PNG flags) for remote fault identification over I²C telemetry link. Use Value: Latched status bits allow non-volatile fault capture between power cycles; thermal shutdown prevents damage during extended outdoor operation. |
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 |
|---|---|---|---|
| MAX2181AETE+ | Single 13/18 V output; no integrated boost converter - requires external 20 V supply; 22 kHz tone generated internally but lacks DiSEqC envelope mode. | Best suited for designs with existing high-voltage rail; lacks dynamic short-circuit protection and I²C diagnostic registers. | Select when board already provides ≥20 V and simplicity outweighs diagnostic capability. |
| LM48530SQ/NOPB | Integrated boost + LDO; 92% efficiency @ 0.5 A; supports 22 kHz tone but only via internal generator - no external TTL or envelope input. | Compatible for basic LNB powering but cannot interface with legacy DiSEqC envelope sources or external tone generators. | Choose when DiSEqC 1.x envelope compatibility is not required and cost is prioritized over flexibility. |
Compared with MAX2181AETE+ and LM48530SQ/NOPB, the LNBH25LSPQR uniquely combines integrated boost conversion, triple-mode 22 kHz input support, and comprehensive I²C-accessible diagnostics - making it the only option supporting full DiSEqC 1.x interoperability in space-constrained satellite receiver designs.
Availability
LNBH25LSPQR is available at Aetrix Electronics and suitable for digital satellite set-top boxes, hybrid TV-satellite receivers, and PC-based satellite tuner cards requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LNBH25LSPQR 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, mixed-signal, power, and microcontroller products for automotive, industrial, and consumer markets.
The LNBH25LSPQR belongs to ST's satellite front-end power management product line, engineered specifically to replace discrete LNB supply circuits in DVB-S/S2 receivers while meeting stringent ESD, efficiency, and DiSEqC compliance requirements.
FAQ
What is the minimum input voltage required for LNBH25LSPQR startup?
The LNBH25LSPQR incorporates an undervoltage lockout (UVLO) circuit that disables all functions until VCC rises above 4.7 V (typical). Operation begins at ~4.8 V, at which point the I²C interface becomes active and registers initialize to zero. Below this threshold, the device draws <10 µA and ignores I²C commands.
How is the 22 kHz tone waveform integrity maintained at no-load condition?
The LNBH25LSPQR uses an internally trimmed oscillator and dedicated output stage to ensure 22 kHz tone amplitude, rise/fall time, and duty cycle remain within DiSEqC specifications even with zero load on VOUT. This is verified across process/voltage/temperature corners and does not rely on external loading for stability.
Can the LNBH25LSPQR drive multiple LNBs simultaneously?
No - the LNBH25LSPQR is designed for single-LNB operation with a maximum output current of 750 mA. Driving multiple LNBs would exceed its current capability and compromise thermal safety margins. For multi-LNB systems, one IC per LNB or a dedicated multi-output controller like the LNBH26 is required.
What external components are mandatory for basic operation?
Mandatory components include: (1) LX-to-GND boost inductor (10 µH typical), (2) VUP-to-GND ceramic capacitor (10 µF), (3) VBYP-to-GND ceramic capacitor (1 µF), (4) ISEL-to-GND resistor (for current limit), and (5) SCL/SDA pull-up resistors (4.7 kΩ). The DSQIN and ADDR pins may be left unconnected if default functionality suffices.
LNBH25LSPQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Converter, Analog and Digital Satellite STB Receivers/SatTV
- Voltage - Input:
- 8V ~ 16V
- Number of Outputs:
- 1
- Voltage - Output:
- 13V, 18V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LNBH25LSPQR FAQ
1.How can I place an order for LNBH25LSPQR through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH25LSPQR 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 LNBH25LSPQR reliable?
The price and inventory of LNBH25LSPQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH25LSPQR is usually 5 days.
3.What payment methods are accepted for LNBH25LSPQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH25LSPQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH25LSPQR?
LNBH25LSPQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH25LSPQR 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 LNBH25LSPQR?
For technical support, including LNBH25LSPQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH25LSPQR requirements.
6.How does Aetrix verify that LNBH25LSPQR is sourced from the original manufacturer or authorized distributors?
All LNBH25LSPQR 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 LNBH25LSPQR meets industry standards.
7.What is the process for return or replacement of LNBH25LSPQR?
All LNBH25LSPQR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH25LSPQR, 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 LNBH25LSPQR part is unused and in its original packaging.
Return procedure for LNBH25LSPQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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