TPS5430DDAR – Texas Instruments 5.5V to 36V, 3A Step-Down SWIFT™ Converter

Product Overview

The TPS5430DDAR is a 3A wide-input step-down DC/DC converter manufactured by Texas Instruments. It belongs to TI’s SWIFT™ converter family, designed for efficient conversion from higher DC input voltages to lower regulated output voltages.

This device integrates a high-side N-channel MOSFET switch, uses a fixed 500kHz switching frequency, and supports an input voltage range from 5.5V to 36V. It is widely used in industrial power supplies, distributed power systems, car audio, consumer electronics, battery chargers, LED power supplies, and embedded power rails.

According to TI’s official product page, the TPS5430 is a 5.5V to 36V input, 3A, 500kHz step-down converter and the TPS5430DDAR orderable part uses a thermally enhanced 8-pin SO PowerPAD™ package. TI also notes that a newer version of this product is available, so lifecycle and replacement options should be checked before new design-in. 

Part Number Breakdown

Segment	Meaning
TPS	Texas Instruments power management product family
5430	5.5V to 36V, 3A step-down SWIFT™ converter series
DDA	8-pin SO PowerPAD™ package option
R	Tape-and-reel packaging option

Competitive Advantages

✔ Wide 5.5V to 36V input range

✔ Up to 3A continuous output current

✔ Up to 4A peak current

✔ Integrated 100mΩ high-side MOSFET switch

✔ High efficiency up to 95%

✔ Adjustable output voltage down to 1.22V

✔ Fixed 500kHz switching frequency

✔ Internal compensation reduces external parts

✔ Input voltage feedforward improves line regulation and transient response

✔ Thermally enhanced 8-pin SO PowerPAD™ package

✔ Suitable for industrial power supplies, distributed power systems, consumer electronics, battery chargers, LED supplies, and embedded DC/DC conversion

Key Features

1. Wide 5.5V to 36V Input Range

The TPS5430DDAR supports a wide input voltage range from 5.5V to 36V, making it suitable for systems powered from 12V, 24V, and other intermediate DC rails. 

Benefits:

• Suitable for 12V and 24V distributed power systems
• Handles wide input voltage variation
• Useful in industrial and automotive-adjacent designs
• Reduces the need for multiple front-end regulator stages

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2. 3A Continuous Output Current

The device supports up to 3A continuous output current and up to 4A peak current, allowing it to power medium-current embedded loads. 

Benefits:

• Suitable for MCU, DSP, FPGA, and SoC rails
• Supports peripheral power supplies
• Useful for industrial control boards
• Provides current margin for transient loads

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3. Integrated High-Side N-Channel MOSFET

The TPS5430 integrates a high-side N-channel MOSFET switch with low on-resistance. TI lists efficiency up to 95% enabled by a 100mΩ integrated MOSFET switch. 

Benefits:

• Reduces external component count
• Simplifies buck converter design
• Improves efficiency compared with higher-resistance switch solutions
• Helps reduce PCB area and BOM cost

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4. Adjustable Output Voltage Down to 1.22V

The output voltage is adjustable down to approximately 1.22V, with TI listing 1.5% initial accuracy. 

Benefits:

• Supports many common rails such as 1.8V, 2.5V, 3.3V, 5V, and 12V-derived rails
• Useful for processor, logic, communication, and analog supplies
• Allows reuse across multiple power designs
• Suitable for configurable embedded power trees

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5. Fixed 500kHz Switching Frequency

The device operates at a fixed 500kHz switching frequency, allowing designers to use smaller output filter components compared with lower-frequency converters. 

Benefits:

• Supports smaller inductor and capacitor selection
• Reduces solution size
• Simplifies EMI and filter design tradeoffs
• Suitable for compact power supplies

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6. Internal Compensation

The TPS5430 includes internal compensation, which helps minimize the number of external design components. 

Benefits:

• Simplifies loop compensation design
• Reduces external component count
• Helps speed up power supply development
• Useful for engineers who need reliable design reuse

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7. Input Voltage Feedforward

TI lists input voltage feedforward as a feature that improves line regulation and transient response. 

Benefits:

• Better response to input voltage changes
• Improved output regulation
• Useful for systems with noisy or variable input rails
• Helps maintain stable power delivery under changing load and line conditions

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8. Thermally Enhanced SO PowerPAD™ Package

The DDAR orderable part uses an 8-pin SO PowerPAD™ package, designed to improve thermal performance in surface-mount power applications. 

Benefits:

• Better heat dissipation than standard SOIC packages
• Suitable for 3A power conversion designs
• Compact and production-friendly SMT package
• Useful for industrial and embedded power boards

Applications

Industrial Power Supplies

• PLC modules
• Industrial controllers
• Sensor power rails
• Automation boards
• Field equipment power conversion

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Distributed Power Systems

• 12V distributed power rails
• 24V industrial bus conversion
• Intermediate bus converters
• Local point-of-load supplies
• Embedded system power trees

TI’s datasheet sources list 12V/24V distributed power systems as a target application area for the TPS5430 family. 

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Consumer Electronics

• Set-top boxes
• DVD systems
• LCD display power supplies
• Audio/video equipment
• Home electronics power rails

TI’s older datasheet application summary lists set-top boxes, DVD, and LCD displays among consumer applications. 

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Battery Chargers and LED Power Supplies

• Battery charger front-end converters
• High-power LED supplies
• Constant-voltage LED driver front-end rails
• Portable equipment power stages

The TPS5430 family is also listed for battery chargers and high-power LED supply applications. 

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Car Audio and Automotive-Adjacent Power

• Car audio power supplies
• Accessory electronics
• 12V input power rails
• Non-safety automotive-adjacent systems

For automotive-qualified designs, use the corresponding TPS5430-Q1 family rather than assuming the standard TPS5430DDAR is automotive qualified. TI lists TPS5430-Q1 separately as the automotive version.