Texas Instruments TPS5430DDAG4

Overview

TPS5430DDAG4 from Texas Instruments is a 3A, wide-input-range synchronous step-down (buck) DC-DC converter with an integrated 100mΩ high-side N-channel MOSFET, 500kHz fixed switching frequency, 1.221V reference voltage (±1.5% initial accuracy), and operating input range of 5.5V to 36V. It delivers regulated power in space-constrained industrial and consumer power supplies such as LCD displays and battery chargers.

For engineers reviewing the TPS5430DDAG4 datasheet, TPS5430DDAG4 pinout, TPS5430DDAG4 application, or TPS5430DDAG4 equivalent, key selection criteria include its internal compensation, voltage feed-forward architecture for line transient immunity, thermal shutdown at 135°C, ENA-controlled 15μA shutdown current, and SOIC-8 PowerPAD™ package requiring DAP soldering for thermal performance.

Technical Context

The TPS5430DDAG4 implements voltage-mode PWM control with integrated voltage feed-forward, enabling constant power-stage gain across input voltage variations and improving line regulation and transient response. Its internal 1.221V bandgap reference is trimmed for ±1.5% initial accuracy and exhibits ±0.025V drift over –40°C to 125°C junction temperature.

It uses cycle-by-cycle overcurrent protection with 4.0–6.0A peak current limit and enters hiccup mode under sustained overload; thermal shutdown activates at 135–162°C with 14°C hysteresis. The device integrates bootstrap diode recharge and requires a 0.01μF ceramic capacitor between BOOT and PH pins for gate drive.

Key Specifications

Pinout & Package

TPS5430DDAG4 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, enabling 3A operation in thermally constrained layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54302DDAR, the TPS5430DDAG4 lacks Eco-mode and has slightly looser reference tolerance but offers proven stability with zero external compensation components. Against LM2678SX-5.0/NOPB, it trades fixed output and higher current for significantly smaller size, better transient immunity, and simplified layout-critical in dense consumer electronics.

Availability

TPS5430DDAG4 is available at Aetrix Electronics and suitable for consumer display power, industrial 24V distributed supply, car audio amplifier supply, and battery charger auxiliary rail applications requiring stable component supply and long-term manufacturability.

Supply support for TPS5430DDAG4 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 expertise in high-reliability power conversion ICs.

The TPS543x product line was designed for high-current, wide-input-voltage DC-DC conversion in space- and thermally-constrained applications including consumer electronics, industrial controls, and automotive subsystems.

FAQ

What is the maximum continuous output current of the TPS5430DDAG4?

The TPS5430DDAG4 delivers up to 3A continuous output current under recommended operating conditions (T_J ≤ 125°C, proper PCB thermal design with DAP soldered). Peak current capability reaches 4A for short durations, limited by internal overcurrent protection set at 4.0–6.0A. Sustained 3A operation requires adequate copper area under the DAP and ambient temperature below 70°C.

Does the TPS5430DDAG4 require external compensation components?

No, the TPS5430DDAG4 features fully internal Type III compensation, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, reduces BOM count, and improves production consistency. The internal compensation is optimized for stability with standard output LC filters used in 500kHz buck applications.

What is the purpose of the BOOT and PH pins on the TPS5430DDAG4?

The BOOT pin supplies gate drive voltage to the integrated high-side N-channel MOSFET, using a 0.01μF ceramic capacitor connected between BOOT and PH. The PH pin is the switch node-the source of the high-side FET-connecting directly to the external inductor and freewheeling diode (or synchronous rectifier). Proper BOOT capacitor placement and PH routing are critical for reliable high-side FET turn-on and EMI control.

Can the TPS5430DDAG4 operate from a 24V input rail?

Yes, the TPS5430DDAG4 is explicitly rated for 5.5V to 36V input voltage, making it fully compatible with 24V industrial and automotive supply rails. Its UVLO threshold starts at 5.3V (typical), and absolute maximum VIN is 40V, providing robust margin against transients. TI confirms the TPS5430 variant is intended for "a wide variety of power sources including 24V bus."

How does the ENA pin function on the TPS5430DDAG4?

The ENA pin is an active-high enable input with 1.3V rising threshold and 0.5V falling threshold. Pulling ENA ≥1.3V initiates regulation with internal slow-start; pulling ENA ≤0.5V disables switching and reduces supply current to 15μA (typical). The pin includes a 1.5MΩ internal pullup, allowing direct floating for always-on operation. Do not connect ENA to ground via a resistor, as this may prevent reliable disable.