STMicroelectronics LNBH24PPR

Overview

LNBH24PPR from STMicroelectronics is a dual-channel LNB supply and control IC for satellite receiver systems, integrating two independent 13/18 V linear post-regulators with integrated step-up PWM controllers, a patent-pending 22 kHz tone generator compliant with DiSEqC™ 2.0, I²C interface, and full diagnostic feedback (VMON, TMON, IMON, OLF, OTF). It delivers up to 500 mA per channel from a single 8–15 V input, achieves 93% typical step-up efficiency, and supports bi-directional DiSEqC™ communication via dedicated DSQIN/DSQOUT/DETIN pins.

For engineers reviewing the LNBH24PPR datasheet, LNBH24PPR pinout, LNBH24PPR application, or LNBH24PPR equivalent, this device serves as a complete analog/digital dual-LNB interface solution - requiring no external DC-DC controller, offering precise 22 kHz tone generation and detection, real-time current/voltage/temperature diagnostics over I²C, and configurable output current limiting via external resistors on ISEL pins.

Technical Context

The LNBH24PPR implements two fully independent channels (A/B), each with a high-efficiency step-up PWM converter (LX-A/LX-B) feeding a low-drop linear post-regulator (VoRX-A/VoRX-B), enabling stable 13 V or 18 V outputs with only 0.75 V typical dropout. Its internal 22 kHz oscillator is factory-trimmed to ±0.5% frequency accuracy and supports both continuous (TEN bit) and edge-triggered (DSQIN pin) tone activation for DiSEqC™ encoding.

Bi-directional DiSEqC™ 2.0 operation is enabled by dedicated DETIN-A/DETIN-B inputs for tone detection and DSQOUT-A/DSQOUT-B outputs for data extraction, while separate VoTX-A/VoTX-B pins allow tone transmission bypassing the R-L filter to prevent distortion. All protection functions - over-current (dynamic/static PCL mode), over-temperature (150 °C shutdown), short-circuit, and undervoltage lockout (6.7 V) - are monitored and reported via I²C diagnostic bits.

Key Specifications

Pinout & Package

Package: PowerSSO-36 (Exposed pad), thermally enhanced for high-power LNB supply operation in space-constrained satellite receivers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX2181AETM+ and TDA8266HN/C1, the LNBH24PPR uniquely integrates dual-channel regulation, factory-trimmed tone generation/detection, and five I²C-accessible diagnostics in one PowerSSO-36 package - reducing component count, simplifying firmware, and enabling predictive maintenance in field-deployed systems.

Availability

LNBH24PPR is available at Aetrix Electronics and suitable for dual-tuner satellite set-top boxes, sat-PC tuner cards, multi-switch distribution systems, and professional satellite monitoring equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LNBH24PPR 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 microcontrollers, power ICs, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The LNBH24PPR belongs to ST's satellite receiver interface product line, engineered specifically to consolidate dual-LNB power, DiSEqC™ control, and diagnostics into a single monolithic IC - targeting reduced design complexity and improved reliability in next-generation sat-TV hardware.

FAQ

What is the purpose of the AUX bit in the LNBH24PPR?

The AUX bit forces the output voltage to 22 V (typ.) during minimum-load testing to ensure reliable detection of disconnected cables or missing LNBs in multi-IRD configurations. When AUX=1, VUP rises to 22.75 V and VOUT is held at 22 V regardless of VSEL/LLC settings. It must be cleared immediately after IMON reading to resume normal regulation - prolonged use causes excessive power dissipation in the linear post-regulator.

How does the dynamic short-circuit protection (PCL mode) work?

When PCL=0, the LNBH24PPR cycles between 900 ms shutdown (TOFF) and 90 ms active periods (TON) during overload, reducing average power dissipation by over 90%. The OLF bit remains HIGH throughout the cycle. After a full TON with no overload, normal operation resumes and OLF resets LOW. This prevents thermal runaway while maintaining compatibility with capacitive loads that may cause startup issues in static mode.

Can the LNBH24PPR support DiSEqC™ 1.x and 2.0 simultaneously on different channels?

Yes - Section A can be configured for DiSEqC™ 1.x (using DSQIN-A and VoTX-A with R-L filter) while Section B runs DiSEqC™ 2.0 (using DETIN-B/DSQOUT-B for bidirectional data and VoTX-B for tone bursts). Each channel has independent control bits (TEN, TTX, EN), allowing mixed-mode operation without cross-talk, provided external R-L filters and AC coupling are applied per DiSEqC™ spec.

What is the role of the VCTRL pin versus the VSEL bit for output voltage selection?

VCTRL is a TTL-level pin that overrides VSEL to force 13.4 V (VCTRL=0) or 18.5 V (VCTRL=1/floating) instantly - useful for fast switching during channel changes. VSEL is an I²C-configurable bit that sets the base voltage; LLC adds +1 V. VCTRL only affects the linear regulator stage; VUP (step-up voltage) remains determined solely by VSEL/LLC. Using VCTRL=0 long-term increases power loss and must be avoided outside brief transitions.