Texas Instruments LP87702DRHBTQ1

Overview

LP87702DRHBTQ1 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 LP87702DRHBTQ1 datasheet, LP87702DRHBTQ1 pinout, LP87702DRHBTQ1 application, or LP87702DRHBTQ1 equivalent, key selection criteria include its dual-buck + boost topology, 2–4 MHz programmable switching frequency, remote sensing capability, functional safety features (WDI/WD_RESET, VMON1/VMON2, dedicated reference), and I²C interface supporting up to 3.4 MHz for real-time diagnostics and configuration.

Technical Context

The LP87702DRHBTQ1 implements a fully integrated dual-buck + single-boost architecture with independent feedback loops, auto PWM/PFM mode switching, and programmable slew-rate control for precise output voltage ramping during startup and sequencing. Its analog monitoring block provides dedicated inputs (VMON1/VMON2) with configurable thresholds and windows, plus VANA monitoring with selectable overvoltage/undervoltage thresholds.

Functional safety support includes a window watchdog with digital input (WDI) and active-low reset output (WD_RESET), two programmable power-good outputs (PG0/PG1), and thermal warning (115–150°C) and shutdown (140–160°C) thresholds with 20°C hysteresis - all implemented in hardware without software dependency.

Key Specifications

Pinout & Package

LP87702DRHBTQ1 is housed in a 5.0 mm × 5.0 mm VQFN-32 package (RHB) with exposed thermal pad for enhanced heat dissipation in automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LP87702DRHBTQ1, TPS65381A-Q1 offers CAN integration but sacrifices boost capability and dual-buck scalability, while LM63625E-Q1 provides basic high-efficiency conversion without diagnostic or safety infrastructure - making LP87702DRHBTQ1 the only option combining dual 3.5-A bucks, 5-V boost, and ASIL-ready monitoring in a single VQFN.

Availability

LP87702DRHBTQ1 is available at Aetrix Electronics and suitable for automotive radar, camera, and sensor fusion systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for LP87702DRHBTQ1 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 functional safety documentation support.

The LP87702DRHBTQ1 belongs to TI's automotive power management portfolio designed specifically for ADAS sensor modules, delivering integrated buck/boost regulation, hardware-based diagnostics, and AEC-Q100 Grade 1 reliability in compact packages.

FAQ

What is the maximum supported switching frequency for the buck converters in LP87702DRHBTQ1?

The LP87702DRHBTQ1 supports three OTP-programmable buck switching frequencies: 2 MHz (for VOUT_Bx < 0.8 V), 3 MHz (for VOUT_Bx ≥ 0.8 V), and 4 MHz (for VOUT_Bx ≥ 1.1 V). At 4-MHz operation, typical ripple is 5 mV_p-p with 22 µF output capacitance, enabling ultra-compact filter design for space-constrained radar modules. The LP87702DRHBTQ1 also supports external clock synchronization up to 24 MHz.

Does LP87702DRHBTQ1 support remote voltage sensing, and how does it improve regulation accuracy?

Yes, LP87702DRHBTQ1 supports remote sensing on both FB_B0 and FB_B1 pins. By routing sense traces directly to the point-of-load, the device compensates for IR drop across PCB traces and connectors, improving DC load regulation to ±0.3% and reducing transient undershoot/overshoot. This capability is essential for maintaining tight voltage tolerances on high-current SoC cores in LP87702DRHBTQ1-based radar ECUs.

How does the window watchdog in LP87702DRHBTQ1 operate, and what are its key timing parameters?

The LP87702DRHBTQ1 window watchdog requires periodic pulses on the WDI pin within a configurable time window. If pulses are missed or too frequent, WD_RESET asserts low. Detection delay is ≤1.8 µs for clock loss and ≤20 µs for valid clock detection; clock change delay (internal → external) is 600 µs. This hardware-enforced timing ensures deterministic fail-safe behavior independent of host processor state - a core requirement for ASIL-B systems using LP87702DRHBTQ1.

What protection features does LP87702DRHBTQ1 provide for the boost converter output?

The LP87702DRHBTQ1 provides multiple boost-specific protections: overvoltage protection (BOOST_WINDOW = 00–11, ±0.6% to ±9.4%), short-circuit current limiting (625 mA during start-up), bypass-mode short-circuit limit (270–420 mA), and thermal derating. It also monitors VOUT_BST with deglitch time of 12–17 µs and supports programmable output current limits (0.8–3.4 A) based on VIN_BST and BOOST_ILIM settings - ensuring robust operation in LP87702DRHBTQ1-powered radar transceivers.

Can LP87702DRHBTQ1 monitor external power supplies, and how many inputs are available?

Yes, LP87702DRHBTQ1 includes two dedicated analog voltage monitoring inputs - VMON1 and VMON2 - each configurable with eight threshold levels (0.65 V to 1.8 V) and four window accuracies (±1% to ±7%). These inputs support independent monitoring of critical external rails (e.g., 12-V battery feed, 3.3-V PHY supply) and can trigger interrupts or disable outputs upon fault detection - a key diagnostic capability for ISO 26262-compliant systems built around LP87702DRHBTQ1.