Texas Instruments TPS54140ADRCR

Overview

TPS54140ADRCR 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 no-load quiescent current, and adjustable 100-kHz to 2.5-MHz switching frequency via RT/CLK pin. It delivers regulated 3.3-V output in industrial power supplies.

For engineers reviewing the TPS54140ADRCR datasheet, TPS54140ADRCR pinout, TPS54140ADRCR application, or TPS54140ADRCR equivalent, key selection factors include its 3.5–42-V input range, 0.8-V internal reference, PWRGD open-drain power-good indicator, and VSON-10 package with PowerPAD™ thermal enhancement.

Technical Context

The TPS54140ADRCR uses peak current-mode control with slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its error amplifier drives COMP with transconductance of 97 μS (typ) and 26 μS during slow start, enabling stable loop compensation with external RC networks.

It integrates boot UVLO monitoring (2.1-V threshold), frequency foldback during overload, and an internal PLL on RT/CLK for synchronization to external clocks. The SS/TR pin supports both fixed slow-start (via capacitor) and tracking/sequencing (via resistor divider), with dedicated overload recovery discharge circuitry.

Key Specifications

Pinout & Package

VSON-10 package (3.0 mm × 3.0 mm) with exposed thermal pad (Pin 11) requiring PCB solder connection for thermal performance and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1, TPS54140ADRCR offers lower quiescent current and integrated boot diode but lacks automotive qualification; versus TPS54240DGQR, it trades output current for smaller solution size and identical feature set in VSON-10.

Availability

TPS54140ADRCR is available at Aetrix Electronics and suitable for industrial PLCs, automotive aftermarket electronics, and building automation systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TPS54140ADRCR 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 specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability DC/DC conversion solutions.

The TPS54140A product line delivers high-voltage, medium-current buck regulators for industrial and automotive applications where wide input range, low IQ, and integrated features reduce system complexity.

FAQ

What is the maximum input voltage rating for the TPS54140ADRCR?

The TPS54140ADRCR has an absolute maximum input voltage rating of 47 V, with recommended operating input voltage from 3.5 V to 42 V. This 42-V upper limit ensures reliable operation in 24-V industrial systems and 12-V automotive environments with transient margin. Exceeding 42 V continuously may trigger overvoltage protection or degrade long-term reliability.

Does the TPS54140ADRCR require an external bootstrap diode?

No, the TPS54140ADRCR integrates the bootstrap recharge diode internally, eliminating the need for an external component. A 0.1-μF ceramic capacitor must be placed between BOOT and PH pins, and the device monitors BOOT-PH voltage to disable the high-side MOSFET if it falls below 2.1 V, allowing automatic refresh via the internal diode.

How does the PWRGD pin function on the TPS54140ADRCR?

The PWRGD pin on the TPS54140ADRCR is an open-drain output that asserts low when the regulated output voltage falls below 94% or rises above 107% of its nominal value. It deasserts (goes high-impedance) only when VSENSE is within that window, requiring an external pull-up resistor to generate a logic-high signal for system monitoring or reset sequencing.

Can the TPS54140ADRCR synchronize to an external clock?

Yes, the TPS54140ADRCR 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 to the internal PLL. Clock edges must meet minimum pulse width (40 ns) and frequency alignment requirements to maintain lock; loss of clock reverts to resistor-set mode.

What thermal management considerations apply to the TPS54140ADRCR in VSON-10 package?

The TPS54140ADRCR in VSON-10 (DRC) package has a junction-to-board thermal resistance (RθJB) of 20.5°C/W and requires solder connection of the exposed thermal pad (Pin 11) to a large PCB copper area. Without proper pad thermal vias and copper fill, junction temperature rise under 1.5-A load may exceed safe limits, triggering thermal shutdown at 182°C.