Texas Instruments LP87522BRNFRQ1

Overview

LP87522BRNFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive buck converter IC with four integrated MOSFETs, configured as one 3-phase and one 1-phase output rail. It delivers up to 9.0 A (3-phase) and 4.0 A (1-phase) at 2.8–5.5 V input, 0.6–3.36 V programmable output, and 2 MHz switching frequency. It powers infotainment SoCs and radar processors requiring tight voltage accuracy (±2% DC), low ripple (≤4 mV_p-p), and dynamic load response (±40 mV for 1-µs steps).

For engineers reviewing the LP87522BRNFRQ1 datasheet, LP87522BRNFRQ1 pinout, LP87522BRNFRQ1 application, or LP87522BRNFRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed multi-phase configuration behavior, real-world automotive power sequencing requirements, and direct alternative comparisons - all grounded in TI's SNVSB23 production datasheet.

Technical Context

The LP87522BRNFRQ1 implements automatic PWM-to-PFM mode transition and phase shedding/adding (e.g., 3→2-phase at 1.5 A, 2→1-phase at 0.7 A) to maintain high efficiency across 0.1–9 A load range. Its four independent buck cores support configurable interleaving, remote differential sensing per multiphase rail, and synchronized external clock input (1–24 MHz) to minimize EMI.

It integrates I²C interface (up to 3.4 MHz), three programmable GPIOs (EN1/EN2/EN3), interrupt masking, PGOOD with adjustable delay (4 µs to 13 ms), and comprehensive protection including overtemperature warning (115–147 °C), thermal shutdown (140–160 °C), OVP/UVLO on VANA, and per-phase forward/negative current limiting (1.5–5 A / 1.6–2.4 A).

Key Specifications

Pinout & Package

VQFN-HR (26-pin) package, 4.50 mm × 4.00 mm body size, with exposed thermal pad for enhanced thermal dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP87523BRNFRQ1 and TPS65917B1ZWSR, the LP87522BRNFRQ1 uniquely delivers 9 A on a single 3-phase rail with interleaved switching - enabling smaller magnetics, lower ripple, and higher efficiency at mid-to-high loads than discrete or non-interleaved alternatives.

Availability

LP87522BRNFRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, radar sensor modules, and digital cluster display applications requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for LP87522BRNFRQ1 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 company specializing in analog and embedded processing technologies, with deep expertise in automotive power management ICs.

The LP8752x-Q1 product line was designed specifically for next-generation automotive ADAS and infotainment platforms, addressing high-current, low-voltage, multi-rail power delivery with integrated sequencing, diagnostics, and functional safety features.

FAQ

What is the exact multi-phase configuration supported by the LP87522BRNFRQ1?

The LP87522BRNFRQ1 is factory-configured for one 3-phase output (BUCK0–BUCK2) and one independent 1-phase output (BUCK3). This configuration is fixed and cannot be reprogrammed to 4-phase or 2+2-phase modes - only LP87521-Q1 (4-phase), LP87523-Q1 (2+1+1), and LP87525-Q1 (2+2) support alternate topologies. The LP87522BRNFRQ1 datasheet explicitly defines this as its sole operational mode.

Does the LP87522BRNFRQ1 support external clock synchronization, and what frequency range is valid?

Yes, the LP87522BRNFRQ1 supports external clock synchronization via the CLKIN pin. Valid input frequencies range from 1 MHz to 24 MHz, with ±30% accuracy tolerance. The device detects missing clocks within 1.8 µs and transitions to internal oscillator within 600 µs after valid clock detection - ensuring robust timing in noisy automotive environments where crystal stability may degrade.

How does the LP87522BRNFRQ1 handle load transient response for its 3-phase rail?

The LP87522BRNFRQ1 achieves ±40 mV load transient response on its 3-phase rail for 0.1–6 A steps with 1-µs edge rates, per TI's electrical characteristics table. This performance relies on phase interleaving, programmable slew rate (configurable down to 0.47 mV/µs), and active current balancing (<10% mismatch). No external compensation components are required - the loop is fully integrated and factory-tuned.

What protection features are implemented per phase in the LP87522BRNFRQ1?

Each buck phase in the LP87522BRNFRQ1 includes independent forward current limiting (1.5–5 A programmable range), negative current limiting (1.6–2.4 A), and thermal monitoring. Additionally, the device monitors total die temperature for warning (115–147 °C) and shutdown (140–160 °C), plus VANA OVP/UVLO (5.6–6.1 V / 2.51–2.75 V) and per-rail PGOOD with adjustable thresholds - all documented in Section 7.5 of the SNVSB23 datasheet.

Can the LP87522BRNFRQ1's GPIO pins be used for power sequencing of external regulators?

Yes, EN1, EN2, and EN3 on the LP87522BRNFRQ1 are configurable as GPIOs or enable inputs. They support push-pull or open-drain outputs with 2 mA drive strength and can be programmed via I²C to assert in precise startup/shutdown sequences - for example, enabling an external LDO after the 3-phase rail reaches regulation. TI's application note SLVAE37 confirms this use case for coordinating multi-PMIC systems.