TPS2839PWP

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Power management integrated circuits (PMICs) are an essential part of any embedded system, providing clean and reliable power to microcontrollers, processors, memory, and communications channels. Gate drivers are a type of PMICs which enable high-speed, high-power switching of external power transistors by amplifying the small signals generated by the control electronics. The TPS2839PWP is a well known 5 A, 18 V buck gate driver designed for automotive and industrial applications. In this article we will take a closer look at the application field and working principle of the TPS2839PWP.

Application Field of TPS2839PWP

The TPS2839PWP was designed for the automotive environment, for applications such as electric motor drives, linear actuators, and brushless DC motors. This type of stringent environment requires gate drives with low propagation delay, high peak output currents, and a wide operating temperature range; all of which the TPS2839PWP delivers. Thanks to its industry-grade components and its features such as over-temperature protection, over-voltage protection, over-current protection and dual monitoring, it is also suitable for industrial applications. It can drive single N-channel MOSFETs in buck, boost, and inverting (flyback) topologies.

Working Principle of TPS2839PWP

At the core of the TPS2839PWP lies an amplifier circuit which boosts the small input signal from the microcontroller to a voltage level suitable for driving the power MOSFET. It has an input voltage range from 2.5V to 5.5V, and the output can source up to 5A per channel and 18V. The circuit operates from a single 5V supply, which reduces power requirements and heat dissipation compared to dual voltage supply alternatives. Additionally, the driver is capable of switching frequencies up to 2Mhz.

The TPS2839PWP can be broken down into its two main components: the high-side driver, and the low-side driver.

The high-side driver handles the positive gate voltage of the MOSFET and is based on a charge pump driving a pnp transistor. This is a robust and efficient design as it eliminates any additional power loss due to the pnp transistor in the circuit. A phase-shift control technique, which shifts the MOSFET\'s gate voltage by up to 180 degrees relative to the low-side gate voltage, is used to ensure that the two synchronize with each other and reduce any switching losses.

The low-side driver consists of an adjustable current source and a p-channel MOSFET. This design is ideal for applications with low source impedance, such as battery-operated motors, as it provides lower gate charge at higher frequencies when compared to a high-side driver.

Other features of the TPS2839PWP include a high dynamic range current sensing, current limit threshold and dead time; along with full fault protection including over-voltage protection, over-current protection and dual monitoring, with selectable options for monitoring both the load and the source side.

Conclusion

The TPS2839PWP is a powerful, robust and reliable gate driver IC suited for a broad range of automotive and industrial applications. Its innovative design and choice of components ensures high-speed, low-loss switching of external power transistors and enables optimal system efficiency. It provides excellent protection against short circuits, over-voltage and over-current conditions, making it an ideal choice for automotive, industrial and battery-driven projects.

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