Texas Instruments TPS785075BQWDRBRQ1

Overview

TPS785075BQWDRBRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive LDO voltage regulator delivering 1 A output current with 0.65 V fixed output, ±1.7% max accuracy over –40°C to +125°C ambient, ultra-low 315 mV dropout at 1 A (3.3 V_OUT), and 25 µA typical quiescent current - used in radar power rails and instrument cluster post-regulation.

For engineers reviewing the TPS785075BQWDRBRQ1 datasheet, TPS785075BQWDRBRQ1 pinout, TPS785075BQWDRBRQ1 application, or TPS785075BQWDRBRQ1 equivalent, key selection criteria include automotive-grade thermal robustness (T_J = –40°C to +150°C), wettable flank VSON-8 package for solder joint inspection, active output discharge, and 550 µs soft-start for inrush control in safety-critical systems.

Technical Context

The TPS785075BQWDRBRQ1 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (60 dB @ 1 kHz). Its internal 1.2-V bandgap reference feeds an error amplifier controlling the pass element, with foldback current limiting triggered at V_FOLDBACK = 0.4 × V_OUT(NOM) and thermal shutdown at 170°C.

It integrates undervoltage lockout (UVLO) with 1.28–1.62 V rising threshold and 130 mV hysteresis, plus EN pin logic thresholds (V_EN(HI) ≥ 0.9 V, V_EN(LOW) ≤ 0.3 V) compatible with 1.8-V/3.3-V microcontrollers - supporting precise power sequencing in ADAS domain controllers.

Key Specifications

Pinout & Package

TPS785075BQWDRBRQ1 uses the wettable flank VSON-8 (DRB) package (3.0 mm × 3.0 mm), optimized for automated optical inspection (AOI) of solder joints. Thermal pad is electrically connected to GND and must be soldered to a large PCB ground plane for R_θJB = 31.4°C/W performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS785075QWDRBRQ1, the B-version offers verified wettable flank geometry for solder joint inspection; compared with TLV767075QWDRBRQ1, it delivers 100% higher current, 30% lower dropout, and active discharge - essential for functional safety compliance in ASIL-B systems.

Availability

TPS785075BQWDRBRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and medium-range radar systems requiring stable component supply with full AEC-Q100 traceability and PPAP support.

Supply support for TPS785075BQWDRBRQ1 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 decades of automotive qualification expertise.

The TPS785-Q1 product line delivers high-accuracy, high-PSRR LDOs engineered specifically for demanding automotive subsystems including ADAS, infotainment, and body electronics - emphasizing thermal robustness, low noise, and functional safety readiness.

FAQ

What is the maximum junction temperature specification for the TPS785075BQWDRBRQ1?

The TPS785075BQWDRBRQ1 has a maximum junction temperature (T_J) of +150°C, validated per AEC-Q100 Grade 1 requirements for operation from –40°C to +125°C ambient. Thermal shutdown activates at 170°C with 15°C hysteresis, ensuring reliable protection under sustained overload conditions. This rating allows deployment in engine bay-adjacent radar modules where ambient temperatures exceed 105°C.

Does the TPS785075BQWDRBRQ1 support active output discharge, and how does it function?

Yes, the TPS785075BQWDRBRQ1 includes an integrated active pulldown circuit that discharges the output when disabled. With a typical pulldown resistance of 100 Ω at 3.3 V, it pulls V_OUT to GND within 100 µs after EN is driven low. This prevents floating voltages on downstream logic inputs and avoids unintended wake-up events in automotive microcontrollers powered by the TPS785075BQWDRBRQ1.

What is the dropout voltage of the TPS785075BQWDRBRQ1 at 1 A output current?

The dropout voltage of the TPS785075BQWDRBRQ1 is 315 mV maximum at 1 A output current for V_OUT ≥ 3.3 V, measured at V_OUT = 0.95 × V_OUT(NOM). For its fixed 0.65 V output, the dropout is 1130 mV max at 1 A (0.65 V ≤ V_OUT < 0.8 V). This enables operation from a 1.7-V minimum input, supporting use behind buck converters with tight output tolerances.

How does the enable (EN) pin interface with microcontroller GPIOs in automotive systems?

The EN pin of the TPS785075BQWDRBRQ1 accepts logic-high signals ≥ 0.9 V and logic-low ≤ 0.3 V, making it directly compatible with 1.8-V and 3.3-V automotive microcontrollers. It draws only 10 nA at 6.0 V, minimizing load on weak GPIOs. The pin must never be left floating - TI recommends tying EN to IN if unused. This interface supports precise power sequencing in domain controllers where multiple rails are enabled in strict order.

Is the TPS785075BQWDRBRQ1 qualified to AEC-Q100, and what grade does it meet?

Yes, the TPS785075BQWDRBRQ1 is fully AEC-Q100 qualified for automotive applications, meeting Grade 1 specifications with guaranteed operation from –40°C to +125°C ambient temperature. It also satisfies device-level stress testing including HTOL, TC, UHAST, and ESD (±2000 V HBM, ±500 V CDM), providing design assurance for safety-critical systems such as radar and instrument clusters.