Texas Instruments TPS54140ADGQ

Overview

TPS54140ADGQ from Texas Instruments is a 42-V, 1.5-A synchronous step-down DC/DC converter with integrated 200-mΩ high-side MOSFET, Eco-mode™ pulse-skipping for 116-μA quiescent current at light load, adjustable 100-kHz to 2.5-MHz switching frequency via RT/CLK pin, and precision 0.8-V internal reference-designed for industrial 12-V/24-V power rails requiring high efficiency and robust UVLO control.

For engineers reviewing the TPS54140ADGQ datasheet, TPS54140ADGQ pinout, TPS54140ADGQ application, or TPS54140ADGQ equivalent, key selection considerations include its MSOP-10 package with PowerPAD™, 1.3-μA shutdown current, tight 1.11–1.36-V enable threshold, PWRGD open-drain output with 94–107% voltage window, and thermal shutdown at 182°C.

Technical Context

The TPS54140ADGQ implements constant-frequency peak-current-mode control with slope compensation to prevent subharmonic oscillation across full duty cycle range. Its error amplifier features 97-μS transconductance (typ), 10,000 V/V DC gain, and 2.7-MHz bandwidth, driving COMP pin for PWM latch modulation.

It integrates boot UVLO monitoring (2.1-V BOOT-PH threshold), frequency foldback during overload/startup, and an active PLL on RT/CLK enabling synchronization to external clocks up to 2.2 MHz. The SS/TR pin supports both slow-start ramp control and precise power supply sequencing via external resistor divider.

Key Specifications

Pinout & Package

TPS54140ADGQ is housed in a thermally enhanced 10-pin MSOP package (3.0 mm × 3.0 mm) with exposed PowerPAD™ thermal pad (Pin 11) that must be soldered to PCB ground plane for optimal thermal performance (R_θJB = 33°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54140DGQ and LM5164QDDARQ1, the TPS54140ADGQ uniquely combines tight enable threshold control, Eco-mode™ efficiency at microamp loads, and full sequencing/power-good functionality in a thermally optimized MSOP-10 package-making it optimal for programmable industrial power rails demanding reliability and design flexibility.

Availability

TPS54140ADGQ is available at Aetrix Electronics and suitable for industrial motor drives, automotive aftermarket modules, programmable logic controllers, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54140ADGQ 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, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.

The TPS54140A product line delivers high-voltage, high-efficiency buck regulators for industrial, automotive, and communications infrastructure-designed to simplify power design while meeting stringent thermal, efficiency, and functional safety requirements.

FAQ

What is the minimum input voltage required for TPS54140ADGQ to start switching?

The TPS54140ADGQ has an internal undervoltage lockout (UVLO) threshold of 2.5 V, but the actual start input voltage depends on the EN pin configuration. With EN floating (default), startup occurs when VIN exceeds approximately 7.7 V (rising) and sustains operation down to 6.7 V (falling). External resistor dividers on EN can adjust this window. The TPS54140ADGQ will not switch below these thresholds regardless of load condition.

How does the Eco-mode™ operation of TPS54140ADGQ improve light-load efficiency?

TPS54140ADGQ enters Eco-mode™ pulse-skipping when load current drops below ~100 mA, disabling switching cycles while maintaining output regulation via output capacitor discharge. This reduces gate drive and switching losses, lowering operating current to 116 μA. Unlike forced PWM, Eco-mode™ eliminates burst-mode noise and maintains tight voltage regulation-ideal for sensor biasing and standby power in TPS54140ADGQ-based systems.

Can TPS54140ADGQ synchronize to an external clock, and what are the timing requirements?

Yes, TPS54140ADGQ supports external clock synchronization via the RT/CLK pin. When pulled above 1.9 V, the internal oscillator disables and RT/CLK becomes a high-impedance clock input accepting 300–2200 kHz signals. Minimum pulse width is 40 ns, and PLL lock time is 100 μs. Clock edges must be clean and monotonic; stopping the clock reverts RT/CLK to resistor-set mode. This capability ensures deterministic switching in multi-rail TPS54140ADGQ designs.

What thermal design considerations apply to the MSOP-10 PowerPAD™ package of TPS54140ADGQ?

The TPS54140ADGQ DGQ package requires the exposed thermal pad (Pin 11) to be soldered to a minimum 100-mm² copper pour connected to PCB ground. Thermal resistance to board (R_θJB) is 33°C/W; omitting the pad increases junction temperature by >40°C at full load. Use ≥4 thermal vias (0.3-mm diameter) under the pad, filled or capped, and avoid splitting the ground plane beneath the IC to maintain low-impedance heat path-critical for sustaining 1.5-A output in TPS54140ADGQ applications.

Does TPS54140ADGQ provide overvoltage protection, and how does it behave during fault conditions?

Yes, TPS54140ADGQ includes OV protection via its PWRGD comparator. When VSENSE exceeds 109% of nominal, the high-side MOSFET is immediately disabled and masked from turning on until VSENSE falls below 107%. Concurrently, PWRGD asserts low. This prevents destructive overvoltage on downstream circuitry during feedback loop faults or sudden load removal. Recovery is automatic once the fault clears-no latch or reset required. This behavior is intrinsic to the TPS54140ADGQ architecture and requires no external components.