My Inquiry
My Account
STMicroelectronics LNBH25LPQR
- Part No.:
- LNBH25LPQR
- Manufacturer:
- STMicroelectronics
- Category:
- Special Purpose Regulators
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
LNBH25LPQR.pdf
- Description:
- IC REG CONV SAT TV 1OUT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,410
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LNBH25LPQR 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 linear post-regulator, and I²C-controlled 22 kHz tone generator. It delivers programmable 13/18 V output with selectable current limit (up to 750 mA), built-in DiSEqC™ envelope support, and ±4 kV ESD protection on power pins - deployed in STB, TV, and PC-card satellite receivers.
For engineers reviewing the LNBH25LPQR datasheet, LNBH25LPQR pinout, LNBH25LPQR application, or LNBH25LPQR equivalent, key selection criteria include I²C-configurable voltage/current settings, dynamic short-circuit protection timing (90 ms ON / 900 ms OFF), thermal shutdown at 150 °C, and QFN24 (4 × 4 mm) package compatibility with antenna-side PCB layout constraints.
Technical Context
The device implements a two-stage power architecture: a PWM-controlled N-MOS step-up converter generates VUP (typically 19–22 V), which feeds an integrated low-drop linear regulator delivering precise 13/18 V LNB output. The 22 kHz tone is generated internally with factory-trimmed accuracy and supports three activation modes - I²C bit control, external TTL signal via DSQIN, or DiSEqC envelope modulation.
Protection is fully diagnostic-enabled via I²C: PNG detects VCC < 4.7 V, OLF latches overcurrent events (static clamp or pulsed limiting with configurable TON/TOFF), and OTF triggers shutdown at TJ > 150 °C. All status bits are readable in STATUS1 register and require explicit register read to clear.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Programmable 13 V or 18 V via I²C DATA1 register - enables single-IC support for universal LNB polarity switching. |
| Max output current | Up to 750 mA set by external RSEL resistor - allows design margin adjustment without component change. |
| Step-up efficiency | 93% typical at 0.5 A load - minimizes thermal stress in enclosed STB enclosures with limited airflow. |
| 22 kHz tone accuracy | Factory-trimmed to DiSEqC™ standard - ensures reliable communication with multi-switches and legacy LNBs without external oscillator. |
| ESD rating (power pins) | ±4 kV HBM - protects against antenna cable surge transients without requiring additional TVS diodes in basic designs. |
| Thermal shutdown | 150 °C junction temperature - prevents latch-up during sustained overload or poor heatsinking on QFN24 exposed pad. |
| Undervoltage lockout | 4.7 V typical on VCC - blocks I²C operation and power stages until stable 12 V rail is established. |
Pinout & Package
Supplied in QFN24 (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad (Epad) requiring direct connection to PCB ground plane via multiple vias for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (20) | LNB output port | Delivers regulated 13/18 V to LNB; integrates low-drop linear pass transistor with <1 V dropout at full load. |
| VCC (17) | Primary supply input | Accepts 8–16 V DC; powers internal logic and step-up controller; triggers UVLO below 4.7 V. |
| LX (3) | N-MOS drain | Switch node for external boost inductor; requires low-ESR ceramic output capacitor and Schottky catch diode. |
| DSQIN (22) | DiSEqC/22 kHz control input | Configurable as TTL 22 kHz enable or DiSEqC envelope input - selects tone activation mode via EXTM/TEN bits. |
| ISEL (9) | Current limit selection | Resistor-to-ground sets max linear regulator current (IMAX = 13915 / RSEL[kΩ] mA); enables fine-tuned fault margining. |
| SDA/SCL (8,7) | I²C bidirectional interface | Standard 2-wire bus; supports 100 kHz and 400 kHz modes; includes automatic power-on reset and ACK/NACK handling. |
| ADDR (6) | I²C address select | Hardwired HIGH/LOW selects between two I²C addresses (0x08 or 0x09) - permits dual-LNB configurations on same bus. |
| GND/PGND (2,4,15,18,19,23) | Analog & power ground | Separate analog (GND) and power (PGND) grounds converge at Epad - critical for noise isolation in RF-sensitive LNB paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated step-up + LDO architecture | Eliminates need for separate DC-DC and linear regulators - reduces BOM count by ≥4 components in satellite receiver designs. |
| Dynamic short-circuit protection | Pulsed current limiting (TON=90 ms / TOFF=900 ms) cuts average power dissipation by >90% vs. static clamp during sustained faults. |
| I²C-accessible diagnostics | Three dedicated status bits (PNG, OLF, OTF) provide real-time fault identification without external monitoring circuitry. |
| 22 kHz tone integrity at no load | Guaranteed waveform fidelity (rise/fall time, amplitude) even with open-circuit LNB - avoids false DiSEqC command rejection. |
| Exposed thermal pad (Epad) | RthJC = 2 °C/W - enables 2.5 W continuous power dissipation with minimal ΔT in compact STB PCB layouts. |
Applications
| Direct Satellite Broadcast STB | Dual-LNB Multi-Switch Control |
|---|---|
|
Use Scenario: Set-top box supplying power and control signals to single LNB on rooftop dish. IC Role / Device Role / Timing Role: Primary LNB power regulator and DiSEqC™ command interface - generates 13/18 V bias and embeds 22 kHz tone into DC supply line. Use Value: Enables polarity switching and band selection (low/high) using only I²C commands and one coaxial cable - eliminates mechanical switches and extra wiring. |
Use Scenario: Satellite receiver controlling up to 4 LNBs via DiSEqC 1.0/1.1 multi-switch box. IC Role / Device Role / Timing Role: DiSEqC envelope encoder and tone modulator - converts microcontroller UART data into standardized 22 kHz burst-modulated signals. Use Value: Supports sequential addressing of multiple LNBs (A/B/C/D) with precise 22 kHz tone timing (6 µs enable delay, ≤60 µs disable delay) per DiSEqC spec. |
| PC-Based Satellite Tuner Card | Portable Satellite TV Receiver |
|
Use Scenario: Low-profile PCIe or USB tuner card requiring minimal board area and heat generation. IC Role / Device Role / Timing Role: Compact LNB interface IC - integrates DC-DC, LDO, tone generator, and I²C in QFN24 (4 × 4 mm). Use Value: Reduces solution footprint by >35% vs. discrete regulator + oscillator + level shifter - fits within 25 mm × 25 mm tuner card area. |
Use Scenario: Battery-powered portable satellite TV unit needing efficient power conversion and robust surge immunity. IC Role / Device Role / Timing Role: High-efficiency LNB supply with ±4 kV ESD-rated VOUT - withstands antenna cable handling transients without external TVS. Use Value: Extends battery life via 93% step-up efficiency and enables field deployment in lightning-prone regions without added protection components. |
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 24 V max VCC rating; integrated 22 kHz oscillator but no DiSEqC envelope input; no pulsed OCP mode. | Lacks DSQIN envelope support - unsuitable for legacy DiSEqC 1.x multi-switch systems requiring envelope modulation. | Prefer when system uses only I²C-tone mode and requires extended input voltage range beyond 16 V. |
| TDA8261HN/C1 | Lower 600 mA max current; no I²C interface - controlled via analog pins (VSEL, EN); no diagnostic registers. | No digital diagnostics or remote configuration - requires external MCU GPIOs and manual fault detection logic. | Choose for cost-sensitive, fixed-function STBs where firmware complexity must be minimized and diagnostics are not required. |
Compared with MAX2181AETL+ and TDA8261HN/C1, LNBH25LPQR uniquely combines I²C configurability, DiSEqC envelope support, pulsed OCP, and integrated diagnostics - making it optimal for modern STBs requiring field-upgradable LNB control and comprehensive fault reporting.
Availability
LNBH25LPQR is available at Aetrix Electronics and suitable for satellite TV receivers, STB production lines, and PC-based tuner card development requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.
Supply support for LNBH25LPQR 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 automotive ICs with strong focus on system-level integration and industrial reliability.
LNBH25LPQR belongs to ST's satellite receiver interface product line, engineered specifically for DiSEqC™-compliant LNB power and control in consumer and professional broadcast equipment - emphasizing low EMI, high surge tolerance, and minimal external component count.
FAQ
What is the minimum recommended input voltage for reliable LNBH25LPQR operation?
The device incorporates undervoltage lockout (UVLO) that disables all functions until VCC exceeds 4.7 V (typical). Stable operation begins at 4.8 V, and the recommended operating range is 8–16 V per datasheet specifications. Below 8 V, step-up converter duty cycle approaches 100%, increasing ripple and reducing efficiency - thus 8 V is the practical minimum for full performance.
How does the dynamic short-circuit protection behave during startup with large output capacitance?
With highly capacitive loads (>1000 µF), dynamic OCP (PCL=0) may cause repeated 90 ms ON / 900 ms OFF cycling due to inrush current triggering the protection. ST recommends initializing in static mode (PCL=1) during power-up, then switching to dynamic mode after output voltage stabilizes - controlled via I²C DATA3 register write after ~100 ms delay.
Can LNBH25LPQR generate both 13 V and 18 V simultaneously on the same VOUT pin?
No - VOUT provides a single, I²C-programmable output voltage selected from 13 V or 18 V (via DATA1 register bits VSEL1–VSEL4). Polarity switching is achieved by changing this setting between LNB commands; simultaneous dual-voltage output requires two separate LNBH25LPQR devices or a multi-output controller.
Is external compensation required for the step-up converter?
No external compensation is needed - the internal PWM controller is fully compensated. Designers must follow ST's reference layout: place C3 (470 nF–2.2 µF ceramic) close to VUP, use low-ESR C1/C2 electrolytics (≥100 µF), and route LX with minimal loop area. Inductor selection (10 µH, Isat > peak boost current) and Schottky diode (D1) are the only critical external components.
LNBH25LPQR 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, 18.15V
- Operating Temperature:
- 0°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LNBH25LPQR FAQ
1.How can I place an order for LNBH25LPQR through Aetrix?
Please submit a Request for Quotation (RFQ) for LNBH25LPQR 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 LNBH25LPQR reliable?
The price and inventory of LNBH25LPQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LNBH25LPQR is usually 5 days.
3.What payment methods are accepted for LNBH25LPQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LNBH25LPQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LNBH25LPQR?
LNBH25LPQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LNBH25LPQR 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 LNBH25LPQR?
For technical support, including LNBH25LPQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LNBH25LPQR requirements.
6.How does Aetrix verify that LNBH25LPQR is sourced from the original manufacturer or authorized distributors?
All LNBH25LPQR 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 LNBH25LPQR meets industry standards.
7.What is the process for return or replacement of LNBH25LPQR?
All LNBH25LPQR units undergo pre-shipment inspection (PSI). If there is an issue with LNBH25LPQR, 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 LNBH25LPQR part is unused and in its original packaging.
Return procedure for LNBH25LPQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LNBH25LPQR Tags
-
TPS51206DSQR
Texas Instruments
-
TPS51200DRCR
Texas Instruments
-
TPS51200DRCT
Texas Instruments
-
TPS62740DSSR
Texas Instruments
-
TPS51100DGQR
Texas Instruments
-
NCP51200MNTXG
onsemi
-
NCP51400MNTXG
onsemi
-
RT9026GSP
Richtek USA Inc.
-
LP2998MRX/NOPB
Texas Instruments
-
TPS51200QDRCRQ1
Texas Instruments
-
DPA423GN-TL
Power Integrations
-
LM10011SD/NOPB
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
