Texas Instruments TPS79501QDRBRQ1

Overview

TPS79501QDRBRQ1 from Texas Instruments is an AEC-Q100 qualified automotive-grade 500mA low-dropout linear regulator with ultra-low output noise (86.6 µV_RMS, 10 Hz–100 kHz), high PSRR (50 dB at 10 kHz, 500 mA), and fast transient response. It operates from 2.7 V to 6.0 V input, delivers stable output down to 1.225 V (adjustable via FB pin), and maintains regulation with only a 1 µF ceramic output capacitor - ideal for powering RF-sensitive analog circuits in radar and camera modules.

For engineers reviewing the TPS79501QDRBRQ1 datasheet, TPS79501QDRBRQ1 pinout, TPS79501QDRBRQ1 application, or TPS79501QDRBRQ1 equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and ESD specs (±2000 V HBM), and real-world design implications of its 110 mV dropout at full load, 550 µs startup time, and foldback current limiting architecture.

Technical Context

The TPS79501QDRBRQ1 employs a PMOS pass transistor with integrated back diode and implements a hybrid brick-wall/foldback current limit scheme: brick-wall limiting (ICL = 1.65 A) above VFOLDBACK = 0.4 × V_OUT(NOM), transitioning to foldback (ISC = 550 mA) during short-circuit events. Its feedback loop is optimized for stability with 1–200 µF ceramic output capacitors and supports optional feed-forward capacitance (CFF up to 100 nF) to enhance PSRR at high frequencies.

It integrates undervoltage lockout (UVLO threshold: 1.28–1.62 V rising, 130 mV hysteresis), thermal shutdown (T_SD ≈ 150 °C), and active discharge via internal pulldown (RPULLDOWN = 100 Ω). The enable pin accepts TTL/CMOS logic levels (VEN(HI) ≥ 0.85×VIN), and shutdown current is ≤1 µA - enabling low-power system states in automotive infotainment and ADAS subsystems.

Key Specifications

Pinout & Package

TPS79501QDRBRQ1 is housed in an 8-pin VSON (DRB) package measuring 3.0 mm × 3.0 mm with exposed thermal pad. The package uses a bottom-side thermal pad internally connected to GND, requiring connection to a large-area PCB ground plane for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS74501QWDRBRQ1 and TLV76633QWDRBRQ1, the TPS79501QDRBRQ1 uniquely balances ultra-low noise, fast transient response, and automotive-grade foldback protection - making it the optimal choice for radar and camera analog power where spectral purity and fault resilience are non-negotiable.

Availability

TPS79501QDRBRQ1 is available at Aetrix Electronics and suitable for short/medium range radar, automotive camera, and head unit & digital cockpit applications requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for TPS79501QDRBRQ1 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 solutions.

The TPS795-Q1 product line was engineered specifically for noise-critical automotive ADAS and infotainment systems, emphasizing ultra-low noise, high PSRR, and AEC-Q100 reliability - not general-purpose regulation.

FAQ

What is the minimum output capacitor required for stable operation of the TPS79501QDRBRQ1?

The TPS79501QDRBRQ1 is stable with a minimum 1 µF ceramic output capacitor, as confirmed in the datasheet's Recommended Operating Conditions and Typical Characteristics (Figure 5-33–5-35). This enables compact, low-cost designs without requiring larger tantalum or electrolytic capacitors - a key advantage over legacy LDOs that demand ≥10 µF.

Does the TPS79501QDRBRQ1 support adjustable output voltage, and how is it configured?

Yes, the TPS79501QDRBRQ1 supports adjustable output voltage via its FB pin. A resistor divider between OUT and GND sets V_OUT = 1.225 V × (1 + R1/R2), enabling outputs from 1.225 V to 5.5 V – V_DO. The internal reference voltage is tightly regulated at 1.225 V (±2.5% over temperature), ensuring accuracy across automotive operating conditions.

How does the current limiting behavior of the TPS79501QDRBRQ1 differ between legacy and new chip revisions?

The new-chip revision of TPS79501QDRBRQ1 implements a hybrid brick-wall/foldback current limit: brick-wall (ICL = 1.65 A) above VFOLDBACK = 0.4 × V_OUT(NOM), transitioning to foldback (ISC = 550 mA) during short-circuit events. Legacy chips use simpler 2.8 A current limiting without foldback - making the new revision more robust for sustained fault conditions.

Can the TPS79501QDRBRQ1 be used without an input capacitor, and what are the trade-offs?

While the TPS79501QDRBRQ1 does not require an input capacitor for stability, TI recommends a 2.2 µF ceramic capacitor at the IN pin per Section 7.2.2.1. Omitting it increases susceptibility to input ripple and may degrade PSRR at high frequencies; including it improves transient immunity during load steps and reduces EMI coupling from upstream converters.

What thermal management practices are essential for reliable operation of the TPS79501QDRBRQ1 at 500 mA continuous load?

To sustain 500 mA at maximum ambient temperature, the TPS79501QDRBRQ1 requires its exposed thermal pad to be soldered to ≥4 thermal vias (0.3 mm diameter) connecting to an internal ground plane. With R_θJA = 47.8 °C/W, 500 mA at 3.3 V out from 5.5 V in dissipates 1.1 W - resulting in ~52 °C junction rise above ambient. Board-level copper area and airflow must maintain T_J ≤ 125 °C per Recommended Operating Conditions.