TPS54315QPWPRQ1 Integrated Circuits (ICs)

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The TPS54315QPWPRQ1 is an advanced, high-performance, hybrid synchronous buck switching regulator IC. It is members of the Power Partner® family from Texas Instruments. It integrates an input voltage buck converter and an output voltage buck converter in a single chip to provide a cost-effective power solution. The TPS54315QPWPRQ1 switching regulator is designed as a step-down DC/DC converter that is capable of delivering up to 5A of continuous output current. Its low noise output and high-efficiency make it an ideal choice for powering Point of Load, Low-Voltage ASIC and FPGA, and other loads.

The TPS54315QPWPRQ1 adheres to a wide input voltage range of 4.5 – 36 V, which widens the application areas and allows customers to use the same power source design for various components. The device offers programmable operational frequency, adjustable switching slew rate for sophisticated application in communication, data storage, server and embedded systems.

The device also features integrated high-side and low-side MOSFETs to reduce external components and offers current and temperature monitoring pin for external PMbus shutdown control. It supports temperature compensated NVM programming and adjustable output operating voltage between 0.6V and 4.5V and input voltage monitoring enable simplifying the system control loop.

Let’s take a look at the core features that make up the TPS54315QPWPRQ1 and its main application fields and working principles.

Applications

The TPS54315QPWPRQ1 is designed as an efficient, compact and cost-effective power solution for a variety of applications, including communication, data storage, server and embedded systems. The device provides 5A continuous load current and offers adjustable output voltage from 0.6 V to 5.5 V with a wide input voltage range of 4.5 – 36 V to meet multiple power requirements. It is used in many applications which include:

• Point of Load (POL) regulators
• Power supply for low voltage ASIC and FPGA
• Load regulation in DC-DC converters
• Motor controllers
• Biometric scanners

Working Principle

The TPS54315QPWPRQ1 is an advanced synchronous buck switching regulator IC which operates as a step-down regulator. The block diagram of the device is as shown below.

The working principle of the TPS54315QPWPRQ1 can be divided into two primary stages: the input voltage buck converter and the output voltage buck converter.

Input Voltage Buck Converter:

The input voltage buck converter is employed to convert the input voltage from its input terminals to a lower voltage level using the following steps:

1. The input voltage is applied to the MOSFET, which causes it to conduct and provide the necessary current to the input of the buck regulator section.
2. This current is then used to charge the L-Capacitor, which is connected to the power source.
3. The internal MOSFETs are then turned on, which causes the input voltage to be clamped onto a voltage level, regulated by an on-chip control circuit.
4. The input voltage is divided by the duty ratio and then filtered by the L-Capacitor to provide a stable, low voltage level for the output voltage buck converter stage.

Output Voltage Buck Converter:

The output voltage buck converter is employed to convert the input voltage from its input terminals to a lower voltage level as per the following steps:

1. Initially, the output voltage is generated through the input voltage buck converter stage.
2. Then, the inductor stores the energy in the electrical field created by this generated voltage.
3. The output voltage level is controlled by an on-chip regulation circuit, which varies the duty-cycle via pulse-width modulation (PWM).
4. This controlled duty cycle is then applied to the gate of an output MOSFET, which switches the stored energy from the inductor to the output terminals of the TPS54315QPWPRQ1.
5. This switching action results in the output voltage being regulated to its target level.

The TPS54315QPWPRQ1 switching regulator enables the power solution to provide up to 5A of continuous output current and operate at up to 3 MHz. It also offers current and temperature monitoring and an external PMbus shutdown when temperatures exceed a user-defined threshold.

Conclusion

The TPS54315QPWPRQ1 is an advanced, high-performance hybrid synchronous buck switching regulator from Texas Instruments. This device is designed as a step-down DC/DC converter and is capable of delivering up to 5A of continuous output current and operating at up to 3 MHz. Its wide input voltage range and adjustable output voltage permit multiple application fields, including communication, data storage, server and embedded systems. The device also features integrated high-side and low-side MOSFETs to reduce external components and offers current and temperature monitoring pin for external PMbus shutdown control.

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