STMicroelectronics LNBP11LPUR

Overview

LNBP11LPUR from STMicroelectronics is a monolithic linear LNB supply and control voltage regulator in DFN8 (5 × 6 mm) package, designed for satellite receiver front-ends. It delivers 13 V or 18 V regulated output (typ.), supports dual-input supply (VCC1/VCC2), provides integrated 22 kHz tone generation, includes LLC-based coaxial cable length compensation (+1 V), and features dynamic overload protection with 4.7 µF CEXT timing. Used to power and control LNB down-converters in analog/digital satellite receivers.

For engineers reviewing the LNBP11LPUR datasheet, LNBP11LPUR pinout, LNBP11LPUR application, or LNBP11LPUR equivalent, this page details its dual-supply architecture, tristate EN/VSEL logic-controlled voltage selection, integrated tone oscillator startup behavior, LLC compensation function, and dynamic current-limiting cycle timing - all critical for satellite receiver power integrity and DiSEqC compatibility.

Technical Context

The LNBP11LPUR integrates a factory-trimmed 22 kHz oscillator (20–24 kHz, 50% duty cycle, 10 µs edge time) and a tristate EN/VSEL input that selects 13 V (LOW), 18 V (HIGH), or shutdown (high-impedance). Its dual-input architecture automatically routes VCC1 (15–25 V) for 13 V output and VCC2 (22–25 V) for 18 V output to minimize power dissipation.

It implements dynamic overload protection using an external CEXT capacitor: under short-circuit, it cycles between TON = TOFF/12 (e.g., 92 ms) and TOFF = 1100 ms (with 4.7 µF), limiting average power. The LLC pin adds +1 V to selected output voltage to compensate for coaxial cable voltage drop - a feature exclusive to DFN-package versions including LNBP11L.

Key Specifications

Pinout & Package

LNBP11LPUR is housed in a thermally enhanced DFN8 (5 × 6 mm) package with exposed thermal pad (ePAD), optimized for surface-mount satellite receiver PCBs. Pin numbering follows bottom-view orientation per STMicroelectronics documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LNBP10LPUR, LNBP11LPUR saves board space and improves DiSEqC timing margin via integrated oscillator; versus LNBP9L, it delivers 40% lower thermal load and enables coaxial voltage compensation - making it optimal for new SMT-based satellite receiver designs demanding efficiency and long-cable support.

Availability

LNBP11LPUR is available at Aetrix Electronics and suitable for satellite receiver power management, DiSEqC band switching, long-cable satellite installations, and industrial multi-LNB distribution systems requiring stable component supply, consistent thermal performance, and guaranteed 500 mA output capability.

Supply support for LNBP11LPUR 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 sensor solutions for automotive, industrial, and consumer markets.

LNBP11LPUR belongs to ST's LNB supply and control regulator product line, engineered specifically for satellite receiver front-end power integrity, DiSEqC compliance, and thermal efficiency in space-constrained SMT designs.

FAQ

What is the purpose of the LLC pin on LNBP11LPUR?

The LLC (Line Length Compensation) pin is a logic input that, when driven HIGH, increases the selected output voltage (13 V or 18 V) by approximately +1 V. This compensates for DC voltage drop across long coaxial cables-typically used in installations exceeding 40 meters. It is functional only on DFN-package versions like LNBP11LPUR and has no effect on IPPAK variants.

How does the dual-input supply (VCC1/VCC2) improve thermal performance?

VCC1 (15–25 V) is automatically selected when EN/VSEL = LOW (13 V output), minimizing dropout voltage and power dissipation. VCC2 (22–25 V) is selected when EN/VSEL = HIGH (18 V output). At 500 mA load, this reduces power loss by ~1.4 W compared to single-supply operation-critical for maintaining junction temperature below 125 °C in compact receivers.

Can LNBP11LPUR be used with a single DC supply instead of dual rails?

Yes - VCC1 and VCC2 can be tied together to a single 23–25 V supply, though power dissipation increases significantly in 13 V output mode. ST recommends adding a 12–15 Ω series resistor on VCC1 to limit current and manage thermal load, especially when full 500 mA output is required continuously.

What happens during an output short-circuit condition?

When short-circuit is detected, LNBP11LPUR enters dynamic protection mode: it disables output for TOFF = 1100 ms (set by 4.7 µF on CEXT), then resumes for TON = 92 ms. This cycle repeats until fault clears. Average power remains low (<0.5 W), preventing thermal runaway and allowing other system functions to remain operational during the event.