Texas Instruments TPS79328QDBVRQ1

Overview

TPS79328QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, fixed-output 2.8 V, 200 mA low-dropout linear regulator in a 5-pin SOT-23 package. It delivers ultra-low noise (33 µV_RMS, 100 Hz–100 kHz), high PSRR (65 dB at 100 kHz, new chip), and fast start-up (50 µs) for powering noise-sensitive analog circuits in automotive head units and telematics control units.

For engineers reviewing the TPS79328QDBVRQ1 datasheet, TPS79328QDBVRQ1 pinout, TPS79328QDBVRQ1 application, or TPS79328QDBVRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade performance metrics, and real-world implementation guidance for post-regulation power delivery in safety-critical vehicle systems.

Technical Context

The TPS79328QDBVRQ1 implements a high-accuracy bandgap reference with internal 1.225 V nominal feedback voltage and foldback current limiting to manage overcurrent faults without thermal runaway. Its architecture integrates undervoltage lockout (UVLO) with 1.32 V rising threshold and 130 mV hysteresis, ensuring reliable startup and brownout recovery in automotive battery environments.

This fixed-output variant uses a dedicated 5-pin SOT-23 (DBV) package with IN, GND, EN, NC, and OUT terminals-no external feedback network required. The NC pin is unconnected internally and may be grounded for improved thermal performance; the device operates with only 1 µF output capacitance and supports fast load transient response (<100 µs settling time under 200 mA step changes).

Key Specifications

Pinout & Package

TPS79328QDBVRQ1 is packaged in a 5-pin SOT-23 (DBV) measuring 2.8 mm × 2.8 mm, optimized for space-constrained automotive PCB layouts. Thermal resistance R_θJA is 182.3°C/W (JEDEC standard board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS79328QDBVRQ1, TPS79328DBVR offers identical performance but lacks automotive qualification, while TLV73328PDBVR trades noise immunity and protection features for lower IQ-making the Q1 variant essential for functional-safety-relevant automotive subsystems.

Availability

TPS79328QDBVRQ1 is available at Aetrix Electronics and suitable for automotive head units, hybrid instrument clusters, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.

Supply support for TPS79328QDBVRQ1 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 TPS793-Q1 product line was designed specifically for post-regulation in automotive infotainment and body electronics, emphasizing ultra-low noise, high PSRR, and robust fault handling under harsh electrical conditions.

FAQ

What is the maximum input voltage rating for the TPS79328QDBVRQ1?

The TPS79328QDBVRQ1 has an absolute maximum input voltage of 6.5 V for the new chip revision. Operation beyond this risks permanent damage. For reliable long-term use, the recommended operating range is 2.7 V to 5.5 V, aligning with standard automotive battery and DC/DC converter outputs. This range ensures optimal PSRR, dropout, and thermal performance across temperature extremes.

Does the TPS79328QDBVRQ1 require an external bypass capacitor?

Yes-the TPS79328QDBVRQ1 does not include a BYPASS pin in its 5-pin SOT-23 (DBV) fixed-output configuration; therefore, no external bypass capacitor is required or supported. The noise performance (33 µV_RMS) is achieved using internal architecture and the specified 0.01 µF noise reduction capacitor (CNR) between GND and the optional NC pin if grounded. Do not connect any capacitor to pin 4 (NC).

How does the NC pin on the TPS79328QDBVRQ1 affect thermal performance?

The NC pin (pin 4) on the TPS79328QDBVRQ1 is internally unconnected but thermally coupled to the die. TI recommends connecting it to GND via a thermal pad or trace to improve heat dissipation-reducing R_θJA by up to 15°C/W in typical PCB layouts. Leaving it floating does not impair functionality but limits thermal margin under sustained 200 mA loads at high ambient temperatures.

Can the TPS79328QDBVRQ1 be used with a 1 µF output capacitor?

Yes-the TPS79328QDBVRQ1 is stable with a minimum 1 µF ceramic output capacitor (C_OUT), as confirmed in Section 5.3 of the datasheet for the new chip revision. Using 1 µF enables compact designs and reduces bill-of-materials cost, though 2.2 µF or higher improves load transient response and PSRR above 10 kHz. Always place C_OUT within 2 mm of the OUT and GND pins.

What is the purpose of the foldback current limit in the TPS79328QDBVRQ1?

The foldback current limit in the TPS79328QDBVRQ1 protects against thermal runaway during sustained overloads: above VFOLDBACK (≈1.12 V), it limits current to 320–460 mA; below that voltage, current scales down to 175 mA at short-circuit. This design minimizes power dissipation [(VIN – VOUT) × I] during faults, preventing junction temperatures from exceeding 165°C and triggering thermal shutdown-critical for unattended operation in automotive ECUs.