Part Number: TPS54340DDAR

Manufacturer: Texas Instruments

Description: IC REG BUCK ADJ 3.5A 8SOPWR

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Technical Specifications of TPS54340DDAR

Datasheet  TPS54340DDAR datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Texas Instruments
Series Eco-Mode?
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) 4.5V
Voltage – Input (Max) 42V
Voltage – Output (Min/Fixed) 0.8V
Voltage – Output (Max) 41.1V
Current – Output 3.5A
Frequency – Switching 100kHz ~ 2.5MHz
Synchronous Rectifier No
Operating Temperature -40°C ~ 150°C (TJ)
Mounting Type Surface Mount
Package / Case 8-PowerSOIC (0.154″, 3.90mm Width)
Supplier Device Package 8-SO PowerPad

TPS54340DDAR Description

The TPS54340 is a high-side MOSFET-integrated, 42-volt, 3.5-ampere step-down regulator. In accordance with ISO 7637, the device can withstand load dump pulses of up to 45 V. Easy external compensation and component customization are both features of current mode control. With a low ripple pulse skip mode, the no load supply current drops to 146 A. When the enable pin is pulled low, the supply current is cut to 1 A, effectively shutting down the device.

The inbuilt undervoltage lockout threshold is 4.3 V, although this can be raised through the enable pin. Overshoot is avoided and controlled beginning-of-output-voltage ramping is provided.

The TPS54340 comes in an HSOP PowerPADTM packaging with 8 terminals and is thermally improved.

TPS54340DDAR Features

The TPS54340DDAR power management device is versatile and powerful. Key features:

  • Input Range: The TPS54340DDAR accepts input voltages from 4.5 V to 42 V, up to 45 V. This flexibility lets it be employed in many power supply arrangements.
  • Current Mode Control: This DC-DC converter uses current mode control, which improves transient response and stability in many operating scenarios.
  • Continuous and Peak Current Limit: The gadget can take 3.5 A continuous current and 4.5 A peak inductor current. This allows efficient power transmission and peak load current handling.
  • High-Side MOSFET: The TPS54340DDAR has a high-side MOSFET with 92 m. This MOSFET lowers power losses and switches power efficiently, improving system efficiency.
  • Pulse Skipping Eco-modeTM: The device’s eco-mode boosts efficiency during light loads. In low-power operation, clever switching frequency adjustment reduces power losses and enhances energy efficiency.
  • Integrated BOOT Recharge FET: At light loads, the TPS54340DDAR has low dropout. This prevents voltage drop during low-power usage.
  • Low Operating and Shutdown Current: At 146 μA, the gadget consumes little power during regular operation. It draws 1 μA in shutdown mode, optimizing power savings.
  • Fixed Switching Frequency: The TPS54340DDAR may switch between 100 kHz and 2.5 MHz. This set frequency simplifies system design, filtering, and external component synchronization.

Detailed Description

The 42 V, 3.5 A step-down (buck) regulator TPS54340 has a high-side n-channel MOSFET. Constant-frequency, current-mode control decreases output capacitance and simplifies external frequency adjustment. Selecting output filter components from 100 kHz to 2500 kHz offers efficiency or size improvement. A ground-connected resistor to the RT/CLK connector adjusts switching frequency.

An internal phase-locked loop (PLL) attached to the RT/CLK wire synchronizes the power switch to a falling edge of an external clock signal. The TPS54340 starts up at 4.3 V. The EN terminal is where two external resistors set the undervoltage lockout (UVLO) threshold for the input voltage. When EN is floating. The action is enabled via an internal pull up current source. No load (non-switching) operational current is 146 μA. Disabled devices draw 1 μA. High-efficiency power supply designs may deliver 3.5 amperes of continuous current to a load using the integrated 92m high side MOSFET. A bootstrap capacitor from BOOT to SW terminals supplies the gate drive bias voltage for the integrated high side MOSFET.

The TPS54340’s bootstrap recharge diode minimizes extraneous components. A UVLO circuit monitors the BOOT terminal capacitor voltage and shuts off the high side MOSFET when the BOOT to SW voltage falls below a threshold. The TPS54340 can reach 100% duty cycles thanks to an automatic BOOT capacitor recharge circuit. The application’s minimum input supply voltage is near the maximum output voltage. Internal 0.8 V feedback reference is the minimum output voltage. OVP comparators reduce output overvoltage transients.

The high side MOSFET is turned off by the OVP comparator and stays off until the output voltage is less than 106% of the target output value. An inbuilt soft-start circuit lowers output rise time at startup to reduce inrush current and output voltage overshoot in the TPS54340. Output overload resets soft-start timer. The soft-start circuit controls the recovery from fault output to nominal regulation voltage after overload.

To manage inductor current during start-up and overcurrent faults, a frequency foldback circuit lowers switching frequency.

TPS54340DDAR Feature Description

PWM Control with a Fixed Frequency The TPS54340 uses peak current mode control with a set switching frequency. The switching frequency can be changed. An error amplifier compares the output voltage to an internal voltage reference using resistors linked to the FB terminal. The high side power switch is turned on by a built-in generator. The high side power switch current is controlled by the output of the error amplifier at the COMP input.

When the current going through the high side MOSFET switch hits the level set by the COMP voltage, the power switch turns off. As the output current goes up and down, the COMP input voltage will go up and down as well. The device limits the current by clamping the voltage at the COMP terminal to the highest amount possible. The Eco mode, which skips pulses, is made possible by a minimum voltage clamp on the COMP input.

● Slope Compensation Output Current

The TPS54340 adds a ramp to the MOSFET switch current sense signal to make it more accurate. With this slope adjustment, subharmonic oscillations can’t happen when the duty cycle is more than 50%. The slope correction doesn’t change the high side switch’s peak current limit, which stays the same over the whole duty cycle range.

● Pulse Skip Eco-mode

The TPS54340 works in a “Eco-mode” that skips pulses when the load current is low. This makes the device more efficient by cutting down on switching and gate drive losses. The device goes into Eco-mode if the output voltage is within the allowed range and the peak switch current at the end of any switching cycle is less than the pulse-skipping current level. The pulse skipping current cutoff is the highest switch current level that matches a nominal COMP voltage of 600 mV.  When in Eco-mode, the voltage at the COMP input is set to 600 mV and the high side MOSFET is turned off. Since the device isn’t switching, the power coming out of it starts to go down.

When the output voltage goes down, the voltage control loop raises the voltage at the COMP input. When the error amplifier moves COMP above the pulse-skipping level, it turns on the high-side MOSFET and starts switching again. When COMP drops below the pulse-skipping level for Eco-mode, the device goes back into Eco-mode and the output voltage goes back to the number that was set. When in Eco mode, the internal PLL keeps working. In Eco mode, when the load current is low, the switchovers happen at the same time as the external clock signal.


In conclusion, the TPS54340DDAR stands out as a power control device that can be used in a wide range of situations. It has great features, works well, and is easy to use, making it the best choice for engineers and designers who need reliable power options. By following the tips and suggestions in this guide, users can safely add the TPS54340DDAR to their designs, which will give their systems stable, efficient, and high-quality power.

To get the most out of the TPS54340DDAR, it is important to carefully set it up and follow the plan recommendations. By following these rules, users can get the most out of the gadget, reduce electromagnetic interference, and make it work better with heat.

As technology keeps getting better, the need for smart ways to control power keeps growing by leaps and bounds. The TPS54340DDAR is a useful tool for meeting these needs in a wide range of businesses, such as consumer electronics, telecommunications, and industrial equipment.

Don’t miss out on the great perks that the TPS54340DDAR has to offer. Take action today and add this powerful tool to your plans for managing power. Experience the benefits of stability, efficiency, and reliability in your systems and unlock the potential for future growth. Take advantage of the TPS54340DDAR to give your designs more power control power. Get in touch with ICRFQ today to find out more and place your order.

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