Texas Instruments TPS5431DDAR

Overview

TPS5431DDAR from Texas Instruments is a 3A synchronous step-down DC-DC converter with integrated 100mΩ high-side N-channel MOSFET, operating from 5.5V to 23V input and delivering adjustable output down to 1.221V with ±1.5% initial accuracy. It features fixed 500kHz switching frequency, internal compensation, and voltage feed-forward for fast line transient response-used in 12V/24V distributed power systems, car audio supplies, and LED drivers.

For engineers reviewing the TPS5431DDAR datasheet, TPS5431DDAR pinout, TPS5431DDAR application, or TPS5431DDAR equivalent, key selection criteria include its 23V max input rating (vs. TPS5430's 36V), thermal shutdown at 135°C–162°C, hiccup-mode overcurrent protection, and SOIC-8 PowerPAD™ package requiring exposed pad soldering for thermal performance.

Technical Context

The TPS5431DDAR implements constant-frequency voltage-mode control with integrated voltage feed-forward to maintain stable loop gain across input voltage variations, enabling predictable transient response without external compensation. Its internal slow-start circuit ramps the reference voltage linearly over 5.4–10ms to limit inrush current and suppress output overshoot during startup.

Protection architecture includes cycle-by-cycle overcurrent limiting (4.0–6.0A peak), overvoltage protection triggered at 112.5% × VREF, and thermal shutdown with 14°C hysteresis. The ENA pin supports active-high enable with 1.3V rising threshold and 0.5V falling threshold, while shutdown quiescent current is typically 15μA.

Key Specifications

Pinout & Package

TPS5431DDAR is housed in an 8-pin HSOIC (DDA) package with exposed thermal pad (DAP), requiring soldering of the DAP to PCB copper for effective heat dissipation. Junction-to-board thermal resistance is 15°C/W, making thermal pad connection critical for 3A operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS5431DDAR, TPS5430DDAR extends input range at the cost of higher thermal resistance in same package, while MP2332HGTL-Z offers higher current and frequency in smaller footprint but increases external component count and layout complexity.

Availability

TPS5431DDAR is available at Aetrix Electronics and suitable for automotive infotainment power, industrial PLC I/O modules, and LED backlight driver designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS5431DDAR 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, serving industrial, automotive, and consumer markets since 1930.

The TPS543x product line delivers highly integrated, thermally robust buck converters for mid-power point-of-load applications where simplicity, reliability, and wide input range are critical-especially in space-constrained 12V/24V systems.

FAQ

What is the maximum input voltage rating for TPS5431DDAR?

The TPS5431DDAR has a recommended operating input voltage range of 5.5V to 23V, with an absolute maximum rating of 25V on the VIN pin. Exceeding 23V continuously risks violating recommended conditions and may trigger overvoltage protection or reduce reliability. This distinguishes it from the TPS5430DDAR, which supports up to 36V input.

Does TPS5431DDAR require an external bootstrap diode?

No, the TPS5431DDAR integrates the bootstrap recharge diode internally, eliminating the need for an external component between BOOT and VIN. This simplifies layout and reduces BOM count compared to many competing buck controllers. Only a 0.01μF ceramic capacitor between BOOT and PH is required for proper high-side gate drive operation.

How does the ENA pin function on TPS5431DDAR?

The ENA pin on TPS5431DDAR is an active-high enable input with a 1.3V rising threshold and 0.5V falling threshold. When left floating, the internal 1.5MΩ pullup resistor activates the device. Pulling ENA below 0.5V disables switching and reduces quiescent current to ~15μA. It must not be pulled to ground via a resistor, as this conflicts with internal biasing.

What thermal considerations apply to TPS5431DDAR in SOIC-8 PowerPAD™ package?

The TPS5431DDAR in DDA package requires soldering of the exposed thermal pad (DAP) to a PCB copper pour to achieve specified thermal performance. Junction-to-board resistance is 15°C/W; omitting DAP connection degrades thermal resistance significantly, risking thermal shutdown at full 3A load. Layout must ensure low-impedance thermal path and avoid isolation gaps under the pad.

Can TPS5431DDAR be used in place of TPS5430DDAR without design changes?

TPS5431DDAR is not a drop-in replacement for TPS5430DDAR due to its lower 23V max input rating versus 36V, and reduced PH-to-GND absolute maximum voltage (25V vs. 40V). If the application operates strictly within 5.5V–23V and avoids transients above 25V on PH, substitution may be possible-but thermal performance and transient robustness must be revalidated, especially in 24V systems.