Texas Instruments TPS62172QDSGTQ1

Overview

TPS62172QDSGTQ1 from Texas Instruments is an automotive-grade synchronous step-down DC-DC converter with fixed 3.3-V output, 0.5-A continuous current capability, DCS-Control™ topology, and 2.25-MHz switching frequency. It operates from 3 V to 17 V input, features power-good (PG) signaling, 17-µA quiescent current in Power Save Mode, and thermal/short-circuit protection - deployed in ADAS camera power rails.

For engineers reviewing the TPS62172QDSGTQ1 datasheet, TPS62172QDSGTQ1 pinout, TPS62172QDSGTQ1 application, or TPS62172QDSGTQ1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), WSON-8 package compatibility, fixed-output configuration, seamless PWM-to-Power-Save transition, and integrated PG open-drain output for rail sequencing.

Technical Context

The TPS62172QDSGTQ1 implements DCS-Control™ - a hybrid regulation architecture combining voltage-mode feedback with direct output-voltage sensing to achieve fast transient response and stable operation using small external components. Its control loop maintains constant ~2.25 MHz switching in PWM mode and linearly scales frequency downward in Power Save Mode for light-load efficiency.

It integrates high-side (300–600 mΩ) and low-side (120–200 mΩ) MOSFETs, supports 100% duty-cycle operation down to VIN ≈ VOUT + 15%, and includes undervoltage lockout (2.7 V threshold, 180-mV hysteresis), thermal shutdown (160°C), and current limiting (1.05-A typical peak).

Key Specifications

Pinout & Package

TPS62172QDSGTQ1 is housed in a thermally enhanced 2 × 2 mm WSON-8 (DSG) package with exposed thermal pad soldered to AGND for optimal heat dissipation and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62172QDSGTQ1, TPS62171QDSGTQ1 offers identical form-factor and protection but targets 1.8-V logic domains, while LM61480QRTWRQ1 trades pin compatibility for higher current and different feature set - making TPS62172QDSGTQ1 optimal for space-constrained 3.3-V ADAS imaging rails.

Availability

TPS62172QDSGTQ1 is available at Aetrix Electronics and suitable for ADAS camera modules, body electronics control units, and automotive infotainment displays requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for TPS62172QDSGTQ1 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 automotive, industrial, and consumer markets.

The TPS6217x-Q1 product line delivers high-efficiency, small-footprint DC-DC conversion for safety-critical automotive subsystems - specifically engineered for ADAS, powertrain, and body electronics where reliability, thermal resilience, and functional safety readiness are mandatory.

FAQ

What is the output voltage tolerance of the TPS62172QDSGTQ1 under full load and temperature range?

The TPS62172QDSGTQ1 guarantees ±3% output voltage accuracy over –40°C to +125°C junction temperature and full 0–0.5-A load range in PWM mode. This specification includes line, load, and temperature effects - verified per TI's SLVSCK7E datasheet Section 7.5. The fixed 3.3-V output is trimmed at wafer test, eliminating external resistor tolerance errors seen in adjustable variants like TPS62170QDSGTQ1.

Does the TPS62172QDSGTQ1 require external feedback resistors for its 3.3-V output?

No, the TPS62172QDSGTQ1 does not require external feedback resistors. Its 3.3-V output is internally programmed via factory-trimmed resistive divider. Per datasheet Section 6 and Figure 5, the FB pin is internally connected to AGND for fixed-output versions; TI recommends leaving FB unconnected or tying it directly to AGND to improve thermal resistance - unlike the adjustable TPS62170QDSGTQ1 which requires R1/R2.

How does the power-good (PG) signal behave during startup and fault conditions for the TPS62172QDSGTQ1?

The TPS62172QDSGTQ1 PG pin is an open-drain output that goes high-impedance during shutdown (EN low), UVLO, or thermal shutdown - requiring an external pullup resistor. It asserts high (via external pullup) only when VOUT reaches 92–98% of nominal 3.3 V and remains regulated. During startup, PG remains low until soft-start completes (~132 µs typical), then transitions cleanly without chatter due to DCS-Control's stable loop response.

Can the TPS62172QDSGTQ1 operate with input voltage below 3 V, such as during automotive cold-crank?

No, the TPS62172QDSGTQ1 has a minimum operating input voltage of 3 V per its Recommended Operating Conditions (Section 7.3). Its undervoltage lockout triggers at 2.7 V (with 180-mV hysteresis), disabling switching below that threshold. For cold-crank scenarios dipping below 3 V, a pre-regulator or alternative part like TPS62130A-Q1 (2.95-V min) would be required - the TPS62172QDSGTQ1 is not rated for sub-3-V operation.

What thermal performance can be expected from the TPS62172QDSGTQ1 in a standard 2-layer PCB layout?

In a standard 2-layer PCB with 1-in² 2-oz copper thermal pad connected to AGND, the TPS62172QDSGTQ1 exhibits a junction-to-board thermal resistance (RθJB) of 35.5°C/W (Section 7.4). At 0.5-A load and 12-V input, typical power dissipation is ~250 mW - resulting in ~9°C junction-to-board rise. Full derating to 125°C max TJ requires ≤1.1-A load at 25°C ambient, consistent with TI's thermal characterization data in SLVSCK7E.