Texas Instruments LP875241MRNFRQ1

Overview

LP875241MRNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with four independent 1-phase DC/DC regulator cores, supporting up to 4.0 A per phase at 2.8–5.5 V input and 0.6–3.36 V programmable output. It delivers high-efficiency power conversion (up to 90% at 1 A) with 2 MHz switching frequency, I²C interface (up to 3.4 MHz), and integrated protection including overtemperature, OVP/UVLO, and PGOOD monitoring - deployed in automotive camera and infotainment domain controllers.

For engineers reviewing the LP875241MRNFRQ1 datasheet, LP875241MRNFRQ1 pinout, LP875241MRNFRQ1 application, or LP875241MRNFRQ1 equivalent, key selection considerations include its four-1-phase configuration flexibility, remote differential voltage sensing for point-of-load accuracy, programmable GPIOs (EN1/EN2/EN3), and automotive-grade thermal and ESD robustness (HBM ±2 kV, CDM ±750 V on corner pins).

Technical Context

The LP875241MRNFRQ1 implements four fully independent synchronous buck regulators, each with dedicated VIN_Bx, SW_Bx, FB_Bx, and PGND_Bx connections - enabling true 4×1-phase operation without internal phase coupling. Its digital control loop supports automatic PWM-to-PFM mode transition at ≤200 mA and phase shedding/addition thresholds (e.g., 0.7 A shed, 1 A add) to maintain efficiency across load ranges from 1 mA to 4 A per rail.

It integrates a 2 MHz PLL-based clock generator with external clock synchronization (CLKIN), spread-spectrum modulation, and configurable slew-rate control (0.47–10 mV/µs) to suppress EMI. The I²C interface supports Standard, Fast, Fast+, and High-Speed modes, while PGOOD, nINT, and NRST provide system-level fault signaling and sequencing coordination.

Key Specifications

Pinout & Package

VQFN-HR (26-pin) package, 4.50 mm × 4.00 mm body size, with exposed thermal pad - optimized for automotive PCB layouts requiring low profile and high thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-rail automotive buck converter applications.

Compared with LP875231MRNFRQ1 and LP875251MRNFRQ1, the LP875241MRNFRQ1 provides maximum design flexibility for four distinct low-to-medium current domains - simplifying layout partitioning, enabling independent fault containment, and eliminating inter-rail current imbalance concerns inherent in multiphase configurations.

Availability

LP875241MRNFRQ1 is available at Aetrix Electronics and suitable for automotive camera modules, digital instrument clusters, and infotainment head units requiring stable component supply with AEC-Q100 compliance and long-term production support.

Supply support for LP875241MRNFRQ1 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

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive power management and functional safety design.

The LP8752x-Q1 product line was engineered specifically for next-generation automotive ADAS and infotainment platforms - delivering high-density, multi-rail power solutions with integrated diagnostics, sequencing, and EMI mitigation for ASIL-B compliant systems.

FAQ

What is the maximum output current capability of the LP875241MRNFRQ1 per phase?

The LP875241MRNFRQ1 supports up to 4.0 A per phase when input voltage is ≥3 V, and 3.0 A per phase at 2.8 V ≤ VIN < 3 V. This rating applies individually to each of its four independent 1-phase buck regulators - confirmed in the Electrical Characteristics table (IOUT parameter, 1-phase output row). The device does not sum currents across phases; each rail operates autonomously with its own current limit and thermal monitoring.

Does the LP875241MRNFRQ1 support remote voltage sensing, and how is it implemented?

Yes, the LP875241MRNFRQ1 supports remote differential voltage sensing via dedicated FB_B0–FB_B3 pins. Each feedback input connects directly to the load's VOUT pin (positive) and AGND (negative), compensating for PCB trace IR drop. This architecture ensures output voltage regulation accuracy remains within ±2% at the point-of-load - critical for noise-sensitive imaging and radar ICs where local regulation alone would drift under load.

Can the LP875241MRNFRQ1 be synchronized to an external clock, and what is the supported frequency range?

Yes, the LP875241MRNFRQ1 accepts an external clock on the CLKIN pin, supporting nominal frequencies from 1 MHz to 24 MHz with ±30% tolerance. The device detects missing clocks within 1.8 µs and switches to its internal RC oscillator. External synchronization minimizes beat frequencies in multi-rail systems and enables EMI reduction through deterministic clock alignment - verified in the External Clock and PLL section of the datasheet.

How does the LP875241MRNFRQ1 handle thermal protection, and what are the warning and shutdown thresholds?

The LP875241MRNFRQ1 features programmable thermal warning (115–147°C depending on TDIE_WARN_LEVEL setting) and hard thermal shutdown (140–160°C). Warning triggers an interrupt (BUCKx_THERM_WARN) and can be used to throttle system performance; shutdown forces all regulators into high-impedance state. Both functions include 20°C hysteresis to prevent oscillation - detailed in the Protection Functions table under Thermal warning and Thermal shutdown parameters.

What I²C speeds does the LP875241MRNFRQ1 support, and are pull-up resistors required?

The LP875241MRNFRQ1 supports I²C Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes. External 10 kΩ pull-up resistors to VIO (typically VANA) are mandatory on both SCL and SDA lines - specified in Pin Functions and I²C Timing Requirements sections. High-Speed mode requires careful PCB layout to meet 100 pF bus capacitance limits and 10–80 ns rise/fall time constraints.