Part Number: TPS5430DDAR

Manufacturer: Texas Instruments


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of TPS5430DDAR

Datasheet  TPS5430DDAR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Texas Instruments
Packaging Tape & Reel (TR)
Part Status Active
Function Step-Down
Output Configuration Positive
Topology Buck
Output Type Adjustable
Number of Outputs 1
Voltage – Input (Min) 5.5V
Voltage – Input (Max) 36V
Voltage – Output (Min/Fixed) 1.221V
Voltage – Output (Max) 32.04V
Current – Output 3A
Frequency – Switching 500kHz
Synchronous Rectifier No
Operating Temperature -40°C ~ 125°C (TJ)
Mounting Type Surface Mount
Package / Case 8-PowerSOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SO PowerPad

TPS5430DDAR Description

The TPS543x is an advanced PWM converter with a high-side, low-resistance N-channel MOSFET. A high-performance voltage error amplifier, an undervoltage lockout circuit, a slow-start circuit that is internally adjusted to reduce inrush currents, and the foregoing features, the substrate also has a voltage feedforward circuit to improve the transient response. They also provide tight voltage regulation accuracy under transient conditions.

The shutdown supply current is normally decreased to 18 A using the ENA pin. A thermal shutdown, overcurrent limiting, overvoltage protection, and active-high enable are further features. The TPS543x feedback loop is internally adjusted to decrease design complexity and the number of external components. The TPS5431 is designed to run from power rails up to 23 V. A wide range of power sources, including 24 V bus, are regulated by the TPS5430. The TPS543x device is offered in an 8-pin SOIC PowerPADTM packaging that is simple to use and thermally improved. TI offers evaluation modules and the Designer software tool to help designers swiftly complete high-performance power supply designs to satisfy demanding equipment development cycles.

TPS5430DDAR Features

  • Output current of up to 3 A continuously and 4 A peak.
  • A 110-m integrated MOSFET switch enables high efficiency of up to 95%.
  • Broad output voltage range, with initial accuracy of 1.5% and adjustment down to 1.22 V.
  • The external part count is reduced by internal adjustment.
  • With tiny filter sizes, the switching frequency is fixed at 500 kHz.
  • improved transient response and line regulation thanks to input voltage feedforward.
  • The system is safeguarded by the thermal shutdown, overcurrent limiting, and overvoltage protection.
  • working junction temperature range of -40°C to 125°C.
  • available in an 8-pin SO PowerPADTM compact thermally enhanced package.

Detailed Description

The TPS543x is a 3-A, high-side n-channel MOSFET integrated step-down (buck) regulator. The TPS5431 and TPS5430 are designed to run from power rails up to 23 and 36 volts, respectively. These devices use voltage feed-forward in conjunction with constant-frequency voltage-mode control for better line regulation and line transient responsiveness. Design complexity and the number of external components are reduced through internal compensation. A 3-A continuous current flow can be delivered to a load by high-efficiency power supply systems that are supported by the integrated 110-m high-side MOSFET.

Integrated high-side MOSFET gate-drive bias voltage is provided by a bootstrap capacitor linked between the BOOT and PH pins. The bootstrap recharge diode is included in the TPS543x to reduce the number of external components. 5.3 V typical is the default input start-up voltage for the TPS543x. The TPS543x can be turned off via the ENA pin, which lowers the supply current to 18 A. Operation is possible even when the ENA pin is floating, thanks to an internal pullup current source. The internal slow-start circuit of the TPS543x reduces output voltage overshoot and rush current by delaying the output rise time during startup. The inbuilt 1.221-V feedback reference serves as the minimum output voltage. An Overvoltage Protection (OVP) comparator reduces output overvoltage transients. The high-side MOSFET is turned off when the OVP comparator is activated and stays off until the output voltage is less than 112.5% of the target output voltage. Internal cycle-by-cycle overcurrent protection constrains the integrated high-side MOSFET’s peak current. The TPS543x enters hiccup mode overcurrent limiting for continuous overcurrent fault conditions. The gadget is shielded from overheating via thermal protection.

Feature Description

● Oscillator Frequency

The inbuilt free-running oscillator establishes a 500 kHz PWM switching frequency. The output inductor is less because the 500 kHz switching frequency allows for less output inductance while maintaining the same output ripple requirement.

● Voltage Reference

The voltage reference system scales a temperature-stable bandgap circuit’s output to create a precise reference signal. 1.221 V at room temperature is the output that the bandgap and scaling circuits are trimmed to during production testing.

● Enable (ENA) and Internal Slow Start

The regulator can be turned on and off electrically via the ENA pin. The regulator begins to operate, and the internal slow start starts to climb once the ENA pin voltage surpasses the threshold value. The inbuilt slow start resets, and the regulator stops switching if the ENA pin voltage is brought below the threshold value. The regulator will be turned off, and the shutdown mode will be engaged if the pin is connected to the ground or any voltage lower than 0.5 V.

In shutdown mode, the TPS543x typically draws 18 A of quiescent current. Because the ENA pin has an internal pull-up current source, it can be floated by the user. Use open drain or open collector output logic to connect with the ENA pin if an application calls for pin control. An internal slow-start circuit linearly ramps up the reference voltage from 0 V to its final value to reduce the start-up inrush current. Typically, the inherent sluggish start time is 8 ms.

● Undervoltage Lockout (UVLO)

When VIN (the input voltage) falls below the UVLO start voltage threshold, the TPS543x device is kept deactivated by an undervoltage lockout circuit. Internal circuits are maintained dormant during power-up, and the internal slow start is grounded until VIN surpasses the UVLO start threshold voltage. The internal slow start is released when the UVLO start threshold voltage is attained and the device starts up. The gadget continues to function when VIN is lower than the UVLO stop threshold voltage. The UVLO comparator typically has 330 mV of hysteresis.

● Overcurrent Limiting

The drain-to-source voltage of a high-side MOSFET limits how much current can flow. The voltage from the drain to the source is compared to the limit for too much current. If the voltage from the drain to the source is higher than the threshold, the overcurrent indicator is on. To avoid turn-on noise glitches, the system ignores the overcurrent indicator for the leading-edge blanking time at the beginning of each cycle.

When the overcurrent indicator is true, the overcurrent limiting takes place. Because of a propagation delay, the high-side MOSFET is turned off for the cycle. Overcurrent is limited to one cycle at a time. Cycle-by-cycle current limiting could let overcurrent runaway happen in situations with a lot of current, such as a short circuit. Overcurrent limiting in Hiccup mode limits the current. The voltage reference is connected to the ground for hiccup mode overcurrent limiting, and the high-side MOSFET is turned off. After a hiccup, the slow start circuit turns on the regulator again.


The TPS5430DDAR is a flexible and reliable part used in many power supply applications. With its great features and abilities, the TPS5430DDAR is a valuable addition to the power electronics industry. In the future, we can expect more improvements and changes. As power needs change, the TPS5430DDAR’s ability to deliver high efficiency, low noise, and reliable performance will remain important and crucial. Contact ICRFQ, the leading electronic distributor in China, today to get the TPS5430DDAR or any other electronic component. You can be sure to get the best products at affordable prices.

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