Texas Instruments TPS62171QDSGTQ1

Overview

TPS62171QDSGTQ1 from Texas Instruments is an automotive-grade synchronous step-down DC-DC converter with fixed 1.8-V output, DCS-Control™ topology, 3–17-V input range, and 500-mA continuous output current. It delivers high efficiency across load range via seamless PWM-to-Power-Save Mode transition and includes power-good signaling, undervoltage lockout, and thermal shutdown - deployed in ADAS camera power rails.

For engineers reviewing the TPS62171QDSGTQ1 datasheet, TPS62171QDSGTQ1 pinout, TPS62171QDSGTQ1 application, or TPS62171QDSGTQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), 2.25-MHz switching frequency enabling compact 2.2-µH inductor use, open-drain PG output for rail sequencing, and WSON-8 package thermal performance (R_θJB = 35.5°C/W).

Technical Context

The TPS62171QDSGTQ1 implements DCS-Control™, a hybrid regulation architecture combining voltage-mode stability with hysteretic-like transient response by feeding output voltage changes directly into a fast comparator that sets switching timing. Its internal 0.8-V reference and fixed 1.8-V output are achieved via integrated feedback divider - eliminating external resistors while preserving accuracy (±3% in PWM mode).

It operates in three functional states: PWM mode at ~2.25 MHz under medium/heavy loads; Power Save Mode with linearly decreasing frequency at light loads; and 100% duty-cycle mode when VIN approaches VOUT, sustaining regulation down to VIN ≈ VOUT + I_OUT × R_DS(ON). Protection includes overtemperature shutdown (160°C, 20°C hysteresis), short-circuit current limiting (1.05-A typical), and UVLO (2.7-V threshold with 180-mV hysteresis).

Key Specifications

Pinout & Package

TPS62171QDSGTQ1 is housed in a thermally enhanced 2 mm × 2 mm WSON-8 package (DSG) with exposed thermal pad soldered to AGND for optimal heat dissipation (R_θJB = 35.5°C/W). The package supports automated optical inspection and high-density routing.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS62170QDSGTQ1 and TPS62172QDSGTQ1, the TPS62171QDSGTQ1 offers optimized 1.8-V delivery without external components - reducing cost and board space while maintaining identical automotive qualification, thermal performance, and transient response.

Availability

TPS62171QDSGTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, powertrain control units, and body electronics systems requiring stable component supply with full automotive lifecycle support.

Supply support for TPS62171QDSGTQ1 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 company designing analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.

The TPS6217x-Q1 product line delivers high-density, AEC-Q100-qualified DC-DC converters for automotive subsystems demanding precise voltage regulation, robust protection, and seamless light-load efficiency - especially in vision, sensing, and control applications.

FAQ

What is the output voltage setting of the TPS62171QDSGTQ1?

The TPS62171QDSGTQ1 has a factory-programmed fixed output voltage of 1.8 V. Unlike the adjustable TPS62170QDSGTQ1, it uses an internal resistive feedback divider - eliminating the need for external FB resistors and simplifying layout. This fixed value is specified with ±3% accuracy in PWM mode across –40°C to 125°C junction temperature.

Does the TPS62171QDSGTQ1 support power sequencing with other rails?

Yes, the TPS62171QDSGTQ1 supports precise power sequencing via its active-high EN pin and open-drain PG output. EN can be driven by another rail's PG signal to enforce turn-on order, while its own PG pin - pulled up externally - asserts high-impedance during startup and goes low-impedance only after VOUT reaches 95% of 1.8 V. This enables reliable multi-rail coordination in ADAS and infotainment systems.

What thermal performance can be expected from the TPS62171QDSGTQ1 in a standard 2-layer PCB?

In a standard 2-layer PCB with 1-in² copper pour connected to the exposed thermal pad, the TPS62171QDSGTQ1 achieves a junction-to-board thermal resistance (R_θJB) of 35.5°C/W. At 500-mA load and 12-V input, typical power dissipation is ~350 mW - resulting in ~12.5°C temperature rise above board temperature. For sustained full-load operation, adding thermal vias under the pad is recommended to maintain TJ ≤ 125°C.

How does the TPS62171QDSGTQ1 handle light-load efficiency?

The TPS62171QDSGTQ1 maintains high light-load efficiency using DCS-Control™'s seamless Power Save Mode. When output current drops below ~100 mA, it automatically reduces switching frequency linearly - lowering gate drive and switching losses. Quiescent current remains at 17 µA, enabling >85% efficiency even at 1-mA load, which is critical for always-on automotive subsystems like camera wake-up circuits.

Is the TPS62171QDSGTQ1 pin-compatible with other devices in the family?

Yes, the TPS62171QDSGTQ1 is pin-to-pin compatible with TPS62170QDSGTQ1 and TPS62172QDSGTQ1 in the same WSON-8 (DSG) package. All share identical pin configuration, thermal pad layout, and electrical interface - allowing one PCB design to support 1.8-V (TPS62171QDSGTQ1), 3.3-V (TPS62172QDSGTQ1), or adjustable (TPS62170QDSGTQ1) outputs through BOM change only.