STMicroelectronics LNBP11SP-TR

Overview

LNBP11SP-TR from STMicroelectronics is a monolithic linear LNB power supply and control voltage regulator in PowerSO-10 package, designed to deliver 13 V or 14 V (typ.) output to satellite LNB downconverters via coaxial cable, with logic-selectable port (LNBA), integrated 22 kHz tone oscillator (±2 kHz tolerance), and dynamic overload protection using external 4.7 µF capacitor for 1200 ms cycle time. It supports dual-port satellite receivers requiring remote LNB voltage selection, DiSEqC™ encoding, and cable-length compensation.

For engineers reviewing the LNBP11SP-TR datasheet, LNBP11SP-TR pinout, LNBP11SP-TR application, or LNBP11SP-TR equivalent, key selection criteria include dual-supply input architecture (VCC1/VCC2), 22 kHz tone enable timing, LNB short-circuit diagnostic flag (OLF), bypass functionality for master/slave receiver systems, and thermal shutdown at 150 °C.

Technical Context

The LNBP11SP-TR implements a dual-input linear regulator with automatic VCC1 (15–25 V) or VCC2 (22–25 V) selection based on VSEL/LLC logic states, enabling optimized power dissipation for 13 V or 14 V outputs. Its internal 22 kHz oscillator starts within microseconds to support DiSEqC™ burst coding without external components.

Overcurrent protection operates dynamically: upon detection of overload at LNBA, the output shuts off for t_OFF ≈ 1100 ms (with 4.7 µF on CEXT), then resumes briefly for t_ON = t_OFF/15 before rechecking - minimizing thermal stress while maintaining robust start-up into capacitive LNB loads.

Key Specifications

Pinout & Package

LNBP11SP-TR is housed in a PowerSO-10 package - a thermally enhanced surface-mount outline with exposed die pad for improved heat dissipation, compliant with ECOPACK® lead-free standards and JEDEC JESD97 marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LNB supply and control applications.

Compared with LNBP10SP-TR, LNBP11SP-TR adds cable-length compensation for longer runs; compared with LNBP12SP-TR, it targets 13/14 V-only LNBs common in regional DVB-S deployments, offering tighter regulation and lower thermal load at reduced output voltage.

Availability

LNBP11SP-TR is available at Aetrix Electronics and suitable for satellite receiver design, DiSEqC™-enabled set-top boxes, and professional broadcast equipment requiring stable component supply, consistent 22 kHz tone accuracy, and robust LNB short-circuit protection.

Supply support for LNBP11SP-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, microcontroller, power, and automotive ICs with emphasis on energy efficiency and system integration.

LNBP11SP-TR belongs to the LNBP1X series - a family of monolithic LNB power regulators engineered specifically for cost-sensitive, thermally constrained satellite receiver platforms requiring integrated tone generation, dual-port control, and diagnostic feedback.

FAQ

What is the function of the CEXT pin on LNBP11SP-TR?

The CEXT pin connects an external capacitor (typically 4.7 µF) that sets the OFF time (t_OFF ≈ 1100 ms) of the dynamic overload protection circuit. When either LNB output experiences overcurrent, the regulator disables the output for this duration, then briefly resumes for t_ON = t_OFF/15 before rechecking - limiting average power dissipation and enabling safe recovery without manual reset.

Can LNBP11SP-TR drive both LNBA and LNBB simultaneously?

No. LNBP11SP-TR is a PowerSO-10 variant with only one LNB output pin (LNBA); the LNBB pin is omitted per Table 1. It is designed for single-output satellite receivers. For dual-output operation, the PowerSO-20 packaged LNBP20PD-TR or LNBP20CR must be used, which provides dedicated LNBA and LNBB pins with independent control.

How does the LLC pin affect output voltage?

The LLC pin is a logic input that adds +1 V (typ.) to the base output voltage selected by VSEL. With VSEL = LOW (13 V nominal), LLC = HIGH raises output to 14 V (typ.), compensating for coaxial cable voltage drop. This adjustment is implemented internally without external components and is confirmed in the truth table (EN=H, OSEL=L, VSEL=L, LLC=H → VLNBA = 14 V).

Is external decoupling required on the EXTM pin?

Yes. The EXTM pin requires a DC-blocking capacitor (e.g., 100 nF ceramic) between the modulation source and the pin to prevent DC bias from disturbing internal biasing. ST specifies AC coupling for signals up to 400 mVpp; leaving EXTM open is acceptable if external modulation is unused, as the pin has no internal pull-up or pull-down.