Texas Instruments LP87332ARHDRQ1

Overview

LP87332ARHDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two high-current synchronous buck converters (3 A each) and two low-dropout linear regulators (300 mA each), operating from 2.8 V to 5.5 V input. It delivers precise, slew-rate-controlled outputs (0.7–3.36 V for bucks; 0.8–3.3 V for LDOs) with 2 MHz switching, spread-spectrum EMI reduction, and I²C programmability - deployed in automotive camera modules and radar ECUs.

For engineers reviewing the LP87332ARHDRQ1 datasheet, LP87332ARHDRQ1 pinout, LP87332ARHDRQ1 application, or LP87332ARHDRQ1 equivalent, key selection criteria include dual-buck current capability, LDO dropout voltage (200 mV), thermal warning/shutdown thresholds (115 °C / 140 °C), wettable-flank VQFN-28 package compatibility, and I²C timing support up to 3.4 MHz.

Technical Context

The LP87332ARHDRQ1 implements two independent PWM/PFM auto-mode buck regulators with phase interleaving and external clock synchronization via CLKIN (1–24 MHz), enabling EMI optimization and system-level timing coordination. Each buck supports remote sensing, programmable slew rate (0.47–10 mV/µs), and overcurrent protection with forward/negative current limits (1.5–4 A / 1.6–3.0 A).

Its dual LDOs feature 53 dB PSRR at 10 kHz, 82 µVrms output noise, and ±2% DC accuracy, while digital functions include open-drain nINT with maskable events, push-pull PGOOD with 800 µs gating time, and two configurable GPOs synchronized to EN. All regulation and protection logic is managed through a single I²C interface with Fast+ mode support.

Key Specifications

Pinout & Package

LP87332ARHDRQ1 uses a 28-pin, 5.00 mm × 5.00 mm VQFN package with exposed thermal pad connected to PCB ground plane via multiple vias for optimal thermal performance (R_θJB = 8.9 °C/W). Pin numbering follows standard top-view orientation with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck + dual-LDO automotive power management applications.

Compared with LP87322ARHDRQ1 and TPS65321AQ1RGERQ1, the LP87332ARHDRQ1 uniquely combines dual 3-A bucks with dual 300-mA LDOs, programmable slew control, and spread-spectrum EMI reduction - making it the optimal choice for next-generation automotive vision and radar systems requiring both high current and ultra-low noise.

Availability

LP87332ARHDRQ1 is available at Aetrix Electronics and suitable for automotive camera modules, radar ECUs, and surround-view systems requiring stable component supply across extended temperature and long production lifecycles.

Supply support for LP87332ARHDRQ1 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-grade power management and functional safety design.

The LP87332ARHDRQ1 belongs to TI's AEC-Q100 qualified LP873x-Q1 family, engineered specifically for ADAS and infotainment power delivery - emphasizing EMI robustness, thermal resilience, and I²C-configurable sequencing for camera and radar subsystems.

FAQ

What is the maximum output current capability of each buck regulator in the LP87332ARHDRQ1?

Each buck regulator in the LP87332ARHDRQ1 supports up to 3 A continuous output current. This rating assumes proper thermal management - including use of the thermal pad with multiple vias and adequate PCB copper area - and operation within the recommended input voltage range (2.8 V to 5.5 V). The actual achievable current may be limited by forward current limit settings (programmable from 1.5 A to 4 A) and junction temperature constraints (max 140 °C).

Does the LP87332ARHDRQ1 support remote voltage sensing for its buck regulators?

Yes, the LP87332ARHDRQ1 supports remote voltage sensing via dedicated FB_B0 and FB_B1 pins. This allows compensation for IR drop between the regulator output and the point-of-load, improving output voltage accuracy to within ±2% across load and line variations. Remote sensing is especially valuable in automotive applications where long PCB traces connect power supplies to SoCs or sensors.

How does the LP87332ARHDRQ1 reduce electromagnetic interference (EMI)?

The LP87332ARHDRQ1 reduces EMI through two integrated techniques: spread-spectrum frequency modulation of the 2-MHz switching clock and phase interleaving between its two buck regulators. These features lower peak spectral energy and distribute noise across a wider bandwidth - directly supporting compliance with CISPR-25 Class 5 emission limits in automotive camera and radar modules.

What protection features are built into the LP87332ARHDRQ1?

The LP87332ARHDRQ1 integrates comprehensive protection: overtemperature warning (115/127 °C) and shutdown (140 °C), buck/LDO overvoltage (39–64 mV) and undervoltage (−53 to −29 mV) detection, short-circuit detection (280–440 mV for bucks; 190–450 mV for LDOs), and programmable current limiting. All protections trigger masked interrupts via the nINT pin and can be configured through the I²C interface.

Can the LP87332ARHDRQ1 synchronize its switching frequency to an external clock source?

Yes, the LP87332ARHDRQ1 supports external clock synchronization via the CLKIN pin, accepting frequencies from 1 MHz to 24 MHz. When enabled, the internal buck switching frequency locks to a multiple of the external clock, enabling deterministic timing alignment across multiple power rails or with system clocks - a key requirement for radar chirp synchronization and multi-sensor time-of-flight systems.