Texas Instruments TPS71709QDSERQ1

Overview

TPS71709QDSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, low-noise, high-PSRR linear regulator delivering 150 mA output with 0.9 V fixed output voltage, 170 mV typical dropout at full load, and 30 μV_RMS (100 Hz–100 kHz) output noise - deployed in camera sensor and PLL power rails for ADAS and infotainment systems.

For engineers reviewing the TPS71709QDSERQ1 datasheet, TPS71709QDSERQ1 pinout, TPS71709QDSERQ1 application, or TPS71709QDSERQ1 equivalent, key selection criteria include ultra-high PSRR (70 dB @ 1 kHz), thermal shutdown (160°C), enable logic compatibility (VEN(high) = 1.2 V min), and stability with only 1 μF ceramic output capacitance.

Technical Context

The TPS71709QDSERQ1 uses a PMOS pass device and advanced BiCMOS process to achieve fast startup, low ground current (45 μA typ), and excellent transient response. Its error amplifier features precision 1.20-V bandgap reference and high-gain feedback loop ensuring ±3% worst-case output accuracy over temperature, line, and load.

It integrates undervoltage lockout (UVLO: 2.45 V rising threshold), thermal shutdown (160°C trip), and internal current limiting (200–575 mA). The NR pin enables external 10-nF noise-reduction capacitor to lower output spectral noise density by up to 8× versus no NR cap.

Key Specifications

Pinout & Package

TPS71709QDSERQ1 is packaged in a 6-pin, 1.5-mm × 1.5-mm WSON (DSE) package with exposed thermal pad - optimized for space-constrained automotive modules requiring high thermal efficiency (R_θJB = 149.3°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise LDO applications.

Compared with TPS71709QDSERQ1, TPS71712QDSERQ1 offers identical performance at 1.2 V but cannot replace it in 0.9-V systems, while TLV70710PDQNR sacrifices PSRR, noise, and automotive qualification for lower cost and smaller footprint - making TPS71709QDSERQ1 the only qualified solution for demanding ADAS sensor rails.

Availability

TPS71709QDSERQ1 is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power domains, and wireless connectivity subsystems requiring stable component supply across extended temperature and long production lifecycles.

Supply support for TPS71709QDSERQ1 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 designing analog ICs, embedded processors, and system solutions for automotive, industrial, and personal electronics markets.

The TPS717-Q1 product line delivers ultra-low-noise, high-PSRR LDOs specifically engineered for automotive-grade power integrity in radar, camera, and infotainment systems operating from –40°C to +125°C.

FAQ

What is the minimum input voltage required for TPS71709QDSERQ1 to regulate at 0.9 V?

The minimum input voltage is determined by dropout: VIN(min) = VOUT + VDO = 0.9 V + 0.17 V = 1.07 V typical. However, per datasheet Section 6.3, the absolute minimum VIN is 2.5 V - meaning TPS71709QDSERQ1 requires ≥2.5 V input regardless of dropout, due to internal circuitry constraints. This ensures proper UVLO release and bandgap operation.

Does TPS71709QDSERQ1 require an external noise reduction capacitor?

TPS71709QDSERQ1 does not require but strongly benefits from a 10-nF ceramic capacitor on the NR pin: it reduces output RMS noise from ~95 μV to 30 μV (100 Hz–100 kHz) and improves PSRR by 10–15 dB below 100 kHz. Omitting CNR degrades noise performance but maintains regulation and stability.

Is TPS71709QDSERQ1 pin-compatible with other TPS717-Q1 variants?

Yes - all TPS717-Q1 devices in the DSE (1.5-mm × 1.5-mm WSON-6) package share identical pinout: IN, GND, EN, NR, OUT, and N/C. TPS71709QDSERQ1 can be substituted for other fixed-output versions (e.g., TPS71712QDSERQ1) on the same PCB layout, provided output voltage and load requirements align.

What thermal performance can be expected from TPS71709QDSERQ1 in a standard 4-layer automotive PCB?

In a typical 4-layer board with 1-in² 2-oz copper thermal pad connected to GND plane, TPS71709QDSERQ1 achieves R_θJB ≈ 149°C/W. At 150 mA and 170-mV dropout (25.5 mW dissipation), junction-to-board rise is ~3.8°C - well within safe limits even at 125°C ambient, enabling full-load operation without forced air or heatsinks.

How does the enable function behave during power sequencing in automotive systems?

TPS71709QDSERQ1's EN pin is active-high with VEN(low) ≤ 0.4 V (max) for shutdown and VEN(high) ≥ 1.2 V (min) for turn-on. Its 0.2–1.5 μA shutdown current enables precise sequencing: EN can be driven by a delayed GPIO or supervisor IC to ensure TPS71709QDSERQ1 powers its load only after main rails stabilize - preventing latch-up or inrush issues.