Texas Instruments LP873344RHDRQ1

Overview

LP873344RHDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two high-current buck converters (3 A per phase, 2 MHz, dual-phase capable) and two linear regulators (300 mA each), all in a 5-mm × 5-mm VQFN package with wettable flanks. It delivers precise, low-noise power to SoCs and image sensors in head units, camera modules, and radar ECUs.

For engineers reviewing the LP873344RHDRQ1 datasheet, LP873344RHDRQ1 pinout, LP873344RHDRQ1 application, or LP873344RHDRQ1 equivalent, key selection criteria include programmable slew rate (0.5–10 mV/µs), remote differential feedback for ±50 mV transient load response, I²C-controlled sequencing, and integrated overtemperature/short-circuit protection.

Technical Context

The LP873344RHDRQ1 implements dual synchronous buck regulators with configurable single- or dual-phase operation, supporting automatic phase add/shed and spread-spectrum modulation. Its LDOs provide low-noise (82 µVrms) outputs with 53 dB PSRR at 10 kHz and programmable PGOOD monitoring.

Control is executed via I²C interface (up to 3.4 MHz) with programmable start-up/shutdown delays, GPO synchronization, and interrupt masking. The device uses internal RC oscillator or external clock (1–24 MHz) and supports remote voltage sensing to compensate IR drop at point-of-load.

Key Specifications

Pinout & Package

LP873344RHDRQ1 is housed in a 28-pin, 5.00 mm × 5.00 mm VQFN package with exposed thermal pad connected to PCB ground plane via multiple vias. Wettable flanks enable reliable solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS653221A-Q1 and LP87524B-Q1, the LP873344RHDRQ1 uniquely combines dual-phase buck capability, integrated LDOs, remote sensing, and programmable GPOs in a single 5-mm VQFN - enabling compact, high-accuracy power delivery for mid-tier automotive vision and radar ECUs without external support components.

Availability

LP873344RHDRQ1 is available at Aetrix Electronics and suitable for automotive head units, camera modules, and radar ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LP873344RHDRQ1 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-grade power solutions with decades of AEC-Q100 qualification expertise.

The LP8733xx-Q1 product line was designed specifically for automotive infotainment and ADAS power systems, emphasizing high efficiency across light-to-heavy loads, functional safety features, and seamless integration with SoCs and image sensors.

FAQ

What is the maximum supported switching frequency for LP873344RHDRQ1?

The LP873344RHDRQ1 operates with a nominal switching frequency of 2 MHz, with guaranteed range of 1.8–2.2 MHz in PWM mode. This frequency is fixed by internal oscillator or can be synchronized to an external clock (1–24 MHz), provided the resulting buck frequency remains above 1.7 MHz per datasheet requirement. The LP873344RHDRQ1 does not support user-programmable frequency tuning outside this range.

Does LP873344RHDRQ1 support remote voltage sensing in single-phase configuration?

No, LP873344RHDRQ1 supports remote differential feedback only in dual-phase configuration, where FB_B1 serves as the negative sense input for Buck 0. In single-phase mode, both FB_B0 and FB_B1 function as positive sense inputs for their respective buck stages. This architecture ensures accurate point-of-load regulation only when operating in dual-phase mode, as confirmed in Section 5.1 of the datasheet.

What is the purpose of the CLKIN pin on LP873344RHDRQ1?

The CLKIN pin on LP873344RHDRQ1 serves a dual function: it accepts an external clock input (1–24 MHz) to synchronize the buck switching frequency, or operates as a general-purpose digital output (GPO2) when clock input is disabled. When used as GPO2, it is programmable via I²C and shares the same drive strength and voltage limits as other GPOs (0.4 V low, VANA–0.4 V high). The pin must be left floating if unused.

How does LP873344RHDRQ1 handle thermal protection?

The LP873344RHDRQ1 implements two-tier thermal management: a programmable thermal warning flag triggers at 115–147°C (configurable via TDIE_WARN_LEVEL), and hard thermal shutdown activates at 140–160°C. Both thresholds include 20°C hysteresis. Warning events generate an nINT assertion; shutdown forces all regulators off until junction temperature falls below the hysteresis threshold. This behavior is fully documented in Section 6.5 of the datasheet.

Can LP873344RHDRQ1's LDOs be powered from a different supply than the bucks?

Yes, LP873344RHDRQ1 allows independent input sourcing: VIN_LDO0 and VIN_LDO1 accept 2.5–5.5 V supplies that may differ from VIN_B0/VIN_B1 (2.8–5.5 V) and VANA. However, if an LDO is unused, its VIN pin must be connected to VANA per datasheet guidance (Table 5-1). This flexibility enables optimized noise isolation - for example, powering LDOs from a filtered intermediate rail while bucks draw directly from the battery.