Texas Instruments TPS54040ADGQ

Overview

TPS54040ADGQ from Texas Instruments is a 42-V input, 0.5-A synchronous step-down DC-DC converter with integrated 200-mΩ high-side MOSFET, Eco-Mode™ pulse-skipping operation, and adjustable 100 kHz–2.5 MHz switching frequency. It delivers regulated output down to 0.8 V and supports industrial power rails (12 V/24 V) in space-constrained designs.

For engineers reviewing the TPS54040ADGQ datasheet, TPS54040ADGQ pinout, TPS54040ADGQ application, or TPS54040ADGQ equivalent, key selection criteria include light-load efficiency (116 μA quiescent current), precise enable threshold (1.11–1.36 V), UVLO adjustability via EN pin resistors, and thermal robustness (150°C max junction temperature).

Technical Context

The TPS54040ADGQ employs peak current-mode control with internal slope compensation to prevent subharmonic oscillation across full duty cycle range. Its constant-frequency PWM architecture simplifies loop compensation and enables stable regulation under line/load transients.

It integrates boot capacitor recharge logic, BOOT-PH UVLO (2.1 V threshold), and an open-drain PWRGD comparator with 94–107% output voltage window. The SS/TR pin supports both slow-start ramping and supply sequencing via external capacitor or resistor divider.

Key Specifications

Pinout & Package

TPS54040ADGQ is packaged in a 10-pin VSON (DGQ) with exposed thermal pad (3.00 mm × 3.00 mm). The PowerPAD must be soldered to a dedicated GND copper area for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54040ADGQ, TPS54060ADGQ extends input voltage headroom without sacrificing features, while LMR36006QDDAR trades configurability for smaller solution size and lower quiescent current-making each optimal for distinct system priorities.

Availability

TPS54040ADGQ is available at Aetrix Electronics and suitable for industrial automation, automotive aftermarket electronics, and low-power sensor node designs requiring stable component supply and long-term manufacturability.

Supply support for TPS54040ADGQ 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 technologies with decades of DC-DC converter innovation.

The TPS54040A product line delivers high-voltage, low-quiescent-current buck regulators for harsh-environment applications where reliability, wide input range, and flexible configuration are essential.

FAQ

What is the maximum input voltage rating for the TPS54040ADGQ?

The TPS54040ADGQ has an absolute maximum input voltage rating of 47 V on the VIN pin, with recommended operation from 3.5 V to 42 V. Exceeding 42 V continuously may reduce reliability or trigger overvoltage protection; the device is not rated for sustained 48-V operation. Always observe derating guidelines per TI's SLVSB58B datasheet Section 6.1.

How does the TPS54040ADGQ achieve 100% duty cycle operation?

The TPS54040ADGQ achieves 100% duty cycle by monitoring the BOOT–PH voltage and disabling the high-side MOSFET only when it drops below 2.1 V. This allows extended conduction during dropout while still enabling boot capacitor recharge via the internal low-side path. The TPS54040ADGQ maintains regulation down to V_IN – V_OUT ≈ 2.1 V, unlike conventional buck controllers limited by gate drive constraints.

Can the TPS54040ADGQ synchronize to an external clock?

Yes, the TPS54040ADGQ supports external clock synchronization via the RT/CLK pin. When pulled above 2.2 V, the internal oscillator amplifier disables and the pin becomes a high-impedance clock input accepting 300–2200 kHz signals. Synchronization eliminates beat frequencies in multi-rail systems and improves EMI predictability-critical in automotive and industrial timing-critical designs.

What is the purpose of the SS/TR pin on the TPS54040ADGQ?

The SS/TR pin on the TPS54040ADGQ serves dual functions: slow-start ramp control (via external capacitor) and supply tracking/sequencing (via resistor divider). During startup, it overrides the internal 0.8-V reference to linearly ramp the output voltage, limiting inrush current. In tracking mode, it follows another rail's voltage to enforce strict power-up order-essential for FPGAs, processors, and mixed-voltage SoCs.

Does the TPS54040ADGQ include thermal protection?

Yes, the TPS54040ADGQ incorporates thermal shutdown that activates at 182°C junction temperature. Once triggered, the device halts switching and remains disabled until the die cools below the hysteresis threshold (~155°C). This protects against sustained overload, inadequate heatsinking, or ambient temperature excursions-ensuring robust operation in sealed enclosures or high-temperature industrial environments.