Texas Instruments TPS74534PQWDRBRQ1

Overview

TPS74534PQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified 500-mA ultra-low-dropout linear regulator with power-good (PG) output, fixed 3.4-V output, 2-mm × 2-mm wettable-flank WSON-6 package, ±0.85% output accuracy at 25°C, and 160 mV max dropout at 500 mA. It powers critical subsystems in automotive head units and front/rear cameras where stable low-noise voltage regulation and supply monitoring are required.

For engineers reviewing the TPS74534PQWDRBRQ1 datasheet, TPS74534PQWDRBRQ1 pinout, TPS74534PQWDRBRQ1 application, or TPS74534PQWDRBRQ1 equivalent, this page delivers verified technical context-including PG timing thresholds, thermal resistance (RθJA = 80.3°C/W), wettable flank solder inspection support, and functional safety documentation alignment-to accelerate automotive power architecture validation and layout sign-off.

Technical Context

The TPS74534PQWDRBRQ1 implements a precision band-gap reference and error amplifier to achieve ±0.85% output accuracy at 25°C and ±1.5% over –40°C to +150°C junction temperature. Its internal foldback current limit reduces thermal dissipation during short-circuit events, while integrated UVLO (1.17–1.42 V) and thermal shutdown (170°C trip) ensure robust fault protection.

Power-good functionality uses dual thresholds-PG high threshold (92% VOUT) and low threshold (90% VOUT)-with 2% hysteresis and configurable open-drain or push-pull output. Startup time is 200–650 µs, and PG delay times are 135–178 µs (rising) and 1.5–10 µs (falling), enabling precise sequencing with other automotive rails.

Key Specifications

Pinout & Package

TPS74534PQWDRBRQ1 is housed in a 6-pin, 2.00 mm × 2.00 mm wettable flank WSON package (DRV variant) with exposed thermal pad electrically connected to GND. The wettable flank design enables automated optical inspection (AOI) of solder joints-critical for automotive manufacturing traceability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with TPS74534PQWDRBRQ1, the TPS74633PQWDRBRQ1 offers marginally lower dropout for 3.3-V systems but lacks 3.4-V output specificity, while the TLV76633QWDRBRQ1 trades functional safety support and tighter accuracy for higher current and lower cost-making it viable only in non-ASIL contexts.

Availability

TPS74534PQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, front/rear camera modules, and telematics control units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS74534PQWDRBRQ1 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 ICs.

The TPS745-Q1 product line was designed specifically for AEC-Q100-compliant automotive subsystems-emphasizing ultra-low dropout, wettable flank packaging for process reliability, and functional safety documentation to accelerate ASIL-B system certification.

FAQ

What is the maximum input voltage rating for the TPS74534PQWDRBRQ1?

The TPS74534PQWDRBRQ1 has an absolute maximum input voltage of 6.5 V, with recommended operating range from 1.5 V to 6.0 V. Exceeding 6.5 V risks permanent damage. For reliable operation in automotive environments with load dump transients, designers should implement clamping or pre-regulation to keep VIN ≤6.0 V under all conditions. The TPS74534PQWDRBRQ1's UVLO (1.17–1.42 V) ensures clean startup even during cold-crank battery dips.

Does the TPS74534PQWDRBRQ1 require an external feedback resistor network?

No, the TPS74534PQWDRBRQ1 is a fixed-output variant with internal resistor divider set to 3.4 V; the FB pin is internally connected and not accessible for external adjustment. This eliminates component count and layout sensitivity associated with external feedback networks-improving design robustness and reducing calibration effort. The TPS74534PQWDRBRQ1's ±0.85% accuracy at 25°C is guaranteed without trimming.

How does the power-good (PG) output behave during startup and fault conditions?

The TPS74534PQWDRBRQ1 PG output asserts high (for push-pull) or pulls high via external pull-up (for open-drain) when VOUT reaches 92% of 3.4 V and deasserts at 90%, with 2% hysteresis. Startup delay is 200–650 µs to 95% of nominal output. During undervoltage or thermal shutdown, PG deasserts within 1.5–10 µs-enabling fast system-level fault detection and coordinated reset sequencing in automotive ECUs.

Is the TPS74534PQWDRBRQ1 compatible with standard reflow profiles for lead-free assembly?

Yes, the TPS74534PQWDRBRQ1's WSON-6 package is qualified for standard IPC/JEDEC J-STD-020 lead-free reflow profiles, including peak temperatures up to 260°C. Its wettable flank geometry is optimized for solder paste printing and reflow, enabling reliable fillet formation visible under AOI-critical for zero-defect automotive manufacturing. Thermal pad soldering to GND is mandatory for both thermal and mechanical integrity.

What thermal performance can be expected from the TPS74534PQWDRBRQ1 in a typical 4-layer PCB layout?

In a standard 4-layer automotive PCB with 1-in² 2-oz copper GND plane connected to the thermal pad, the TPS74534PQWDRBRQ1 achieves RθJA ≈ 80.3°C/W as specified. At 500 mA load and 3.56-V input (160-mV dropout), power dissipation is 80 mW; resulting in ~6.4°C junction-to-ambient rise above board temperature. This allows reliable operation up to +125°C ambient without derating-validated per AEC-Q100 Grade 1 requirements.