Texas Instruments LP87702DRHBRQ1

Overview

LP87702DRHBRQ1 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 diagnostic hub in radar and camera ECU designs.

For engineers reviewing the LP87702DRHBRQ1 datasheet, LP87702DRHBRQ1 pinout, LP87702DRHBRQ1 application, or LP87702DRHBRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed diagnostic capabilities, real-world sequencing behavior, and cross-referenced alternatives for functional safety–critical automotive power design.

Technical Context

The LP87702DRHBRQ1 implements dual independent buck regulators with auto PWM/PFM mode switching and forced-PWM operation, supporting 2-MHz, 3-MHz, or 4-MHz configurable switching frequencies and remote voltage sensing to compensate IR drop at point-of-load. Its integrated 5-V boost converter operates with programmable current limiting (0.8–3.4 A) and selectable output voltage (4.9–5.2 V).

Diagnostic architecture includes two analog voltage monitor inputs (VMON1/VMON2) with programmable thresholds (0.65–1.8 V) and windows (±1% to ±7%), dedicated reference voltage for diagnostics, and a window watchdog with configurable timeout and active-low reset output (WD_RESET). All functions are controlled via I²C interface supporting up to 3.4-MHz High-Speed mode.

Key Specifications

Pinout & Package

VQFN-32 (RHB) package, 5.00 mm × 5.00 mm body size with exposed thermal pad - enables high-power density and efficient heat dissipation in space-constrained automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP87702DRHBRQ1, TPS65321A-Q1 omits dual-buck capability and diagnostic inputs, limiting use to single-load systems; LP87332D-Q1 provides matching buck/boost topology but lacks window watchdog and thermal warning - making LP87702DRHBRQ1 the only option among the three with full ASIL-B support for radar ECU power supervision.

Availability

LP87702DRHBRQ1 is available at Aetrix Electronics and suitable for automotive radar ECUs, ADAS camera modules, and sensor fusion hubs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for LP87702DRHBRQ1 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 automotive ICs, with decades of automotive qualification expertise and ISO/TS 16949-certified manufacturing.

The LP87702DRHBRQ1 belongs to TI's automotive power management portfolio, designed specifically for ASIL-B–capable radar and vision systems requiring integrated diagnostics, precise sequencing, and robust protection in harsh environments.

FAQ

What is the maximum supported switching frequency for the buck converters in LP87702DRHBRQ1?

The LP87702DRHBRQ1 supports three OTP-programmable buck switching frequencies: 2 MHz (1.8–2.2 MHz range), 3 MHz (2.7–3.3 MHz), and 4 MHz (3.6–4.4 MHz). The selected frequency depends on output voltage - 4-MHz operation requires VOUT ≥ 1.1 V - and enables optimization of inductor size, efficiency, and EMI performance in compact automotive layouts.

Does LP87702DRHBRQ1 support external clock synchronization, and what is the acceptable input frequency range?

Yes, LP87702DRHBRQ1 accepts an external clock via the CLKIN pin (Pin 22) for switching frequency synchronization. The supported nominal input frequency range is 1–24 MHz, with ±30% tolerance on nominal value. Clock detection delay is ≤20 µs, and PLL output jitter is ≤300 ps peak-to-peak - ensuring deterministic timing alignment across multiple PMICs in multi-radar systems.

How does the LP87702DRHBRQ1 implement thermal protection, and what are the warning and shutdown thresholds?

The LP87702DRHBRQ1 provides two-tier thermal protection: overtemperature warning triggers at 115–150°C (configurable via TDIE_WARN_LEVEL bit), giving the host MCU time to throttle loads, while thermal shutdown activates at 140–160°C with 20°C hysteresis. Both thresholds are silicon-characterized and AEC-Q100 validated - ensuring reliable operation in under-hood environments where ambient reaches 125°C.

Can LP87702DRHBRQ1 monitor external power supplies, and how many inputs are available?

Yes, LP87702DRHBRQ1 integrates two dedicated analog voltage monitoring inputs - VMON1 (Pin 30) and VMON2 (Pin 31) - each supporting eight programmable thresholds (0.65–1.8 V) and four window accuracies (±1% to ±7%). These inputs are used to validate auxiliary rails such as CAN transceiver supplies or radar MMIC bias voltages before enabling downstream converters.

What I²C speeds does LP87702DRHBRQ1 support, and are pull-up resistors required?

LP87702DRHBRQ1 supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) I²C modes. External pull-up resistors are mandatory on SCL and SDA lines - TI recommends 2.2-kΩ to 10-kΩ depending on bus capacitance and speed. The device includes internal weak pull-downs on EN1, CLKIN, and WDI but no internal pull-ups.