Texas Instruments LP87702KRHBRQ1

Overview

LP87702KRHBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two high-efficiency buck converters (3.5-A max each), a 5-V boost converter (600-mA max), dual external voltage monitoring inputs, programmable power-good signals, window watchdog with reset output, and comprehensive protection including overtemperature warning/shutdown, OVP/UVLO, short-circuit, and overload detection. It serves as the primary power sequencer and safety monitor in radar and camera ECU designs.

For engineers reviewing the LP87702KRHBRQ1 datasheet, LP87702KRHBRQ1 pinout, LP87702KRHBRQ1 application, or LP87702KRHBRQ1 equivalent, this page delivers verified specifications, validated pin functions, confirmed diagnostic capabilities, real-world sequencing behavior, and cross-referenced alternatives for automotive ADAS power architecture validation.

Technical Context

The LP87702KRHBRQ1 implements dual synchronous buck regulators with auto PWM/PFM mode switching and remote voltage sensing to compensate IR drop at point-of-load, ensuring tight DC accuracy (±2% typical) across load and line variations. Its integrated 5-V boost stage supports sensor biasing or interface rail generation with programmable output voltage (4.9–5.2 V) and bypass switch capability.

Functional safety features include two independent analog voltage monitoring inputs (VMON1/VMON2), dedicated reference voltage for diagnostics, window watchdog with WDI input and WD_RESET output, and configurable power-good signals (PG0/PG1) with programmable thresholds and windows. All protections-thermal warning (115–150°C), shutdown (140–160°C), VANAOVP (4.1–6.1 V), and buck short-circuit detection (0.32–0.45 V)-are hardware-asserted with no firmware dependency.

Key Specifications

Pinout & Package

VQFN-32 (RHB) package, 5.00 mm × 5.00 mm body size with exposed thermal pad for enhanced thermal dissipation in automotive under-hood environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive power management applications.

Compared with TPS65321A-Q1 and LP87332D-Q1, the LP87702KRHBRQ1 uniquely integrates dual high-current bucks, a programmable 5-V boost, dual voltage monitors, and hardware window watchdog - making it the only single-chip solution meeting full ASIL-B power architecture requirements for radar and camera systems.

Availability

LP87702KRHBRQ1 is available at Aetrix Electronics and suitable for automotive radar, ADAS camera, and industrial radar applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for LP87702KRHBRQ1 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, embedded processing, and power management technologies, with deep expertise in automotive-grade reliability and functional safety certification.

The LP87702KRHBRQ1 belongs to TI's LP87xx-Q1 automotive PMIC family, designed specifically to address the stringent power sequencing, diagnostic coverage, and thermal resilience requirements of next-generation radar and vision processing ECUs.

FAQ

What is the maximum output current supported by each buck converter in the LP87702KRHBRQ1?

The LP87702KRHBRQ1 supports up to 3.5 A per buck converter channel. This rating is validated across the full AEC-Q100 Grade 1 temperature range (–40°C to +125°C ambient) with appropriate PCB thermal design and input voltage ≥2.8 V. The actual achievable current depends on junction temperature, input/output voltage differential, and inductor DCR.

Does the LP87702KRHBRQ1 support external clock synchronization, and what frequency range is acceptable?

Yes, the LP87702KRHBRQ1 accepts an external clock via the CLKIN pin for switching frequency synchronization. The supported range is 1 MHz to 24 MHz. The external clock must be selected so that the resulting buck switching frequency remains above 1.7 MHz - e.g., a 12-MHz input yields 3-MHz operation when using the 3× divider setting.

How does the LP87702KRHBRQ1 implement functional safety diagnostics?

The LP87702KRHBRQ1 implements hardware-based functional safety diagnostics including two independent voltage monitoring inputs (VMON1/VMON2), dedicated reference voltage for calibration, window watchdog with WDI input and WD_RESET output, programmable power-good signals with threshold/window detection, and overtemperature warning (115–150°C) prior to shutdown - all compliant with ISO 26262 ASIL-B requirements.

Can the LP87702KRHBRQ1 generate a 5-V output, and how is it configured?

Yes, the LP87702KRHBRQ1 integrates a dedicated 5-V boost converter with output voltage selectable via OTP or I²C register BOOST_VSET (4.9 V, 5.0 V, 5.1 V, or 5.2 V). It delivers up to 600 mA with ±3% DC accuracy and includes bypass switch mode for low-dropout operation when input exceeds 4.5 V.

What package type and thermal characteristics does the LP87702KRHBRQ1 use?

The LP87702KRHBRQ1 uses a 32-pin VQFN (RHB) package measuring 5.00 mm × 5.00 mm with an exposed thermal pad. Its junction-to-board thermal resistance (RθJB) is 5.6°C/W, and junction-to-ambient (RθJA) is 31.7°C/W - enabling reliable operation at 140°C junction temperature in automotive under-hood applications with standard 2-layer PCB layouts.