PT8A3305HPE

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PT8A3305HPE Application Field and Working Principle

Power management ICs (PMICs) are integrated circuits designed to efficiently manage and convert power in order to power digital devices such as microcontrollers, sensors, and communications equipment. The PT8A3305HPE is a high-efficiency step-down DC/DC converter from Powertronix. It is designed to provide a regulated voltage from a higher input voltage. It is suited for common applications such as 5V, 3.3V, 1.8V, 1.2V and lower supply voltages.

Overview

The PT8A3305HPE is a 4-channel integrated circuit that includes four built-in buck regulator stages with a high efficiency range of 95%. This PMIC can be used to convert an input voltage range of 4.5V to 28V into a adjustable output voltage of 0.5V to 15V. The adjustable output voltage can be set using external resistors. The maximum output currents are also adjustable via external components. The circuit also includes adjustable Under-Voltage-Lockout and Thermal-Protection features as well as an output-enable pin. The operation of the buck regulator is based on a fixed operating frequency of 500kHz, therefore, ceramic output capacitors with a low ESR rating are recommended.

Features

• Four high-performance buck regulators for low-voltage power applications
• High-efficiency range of 95%
• Accepts input voltage from 4.5V to 28V
• Output voltage adjustable from 0.5V to 15V
• Maximum output current adjustable using external components
• Adjustable Under-Voltage-Lockout and Thermal-Protection features
• Fixed operating frequency of 500kHz

Application Fields

The PT8A3305HPE can be used in many applications due to its wide input voltage range and adjustable output voltage and currents. Typical applications include:

• Automotive lighting systems
• Telecommunications systems
• High-efficiency LED lighting solutions
• Smartphones and tablets
• Industrial applications such as sensors and measurement devices
• Portable devices such as digital cameras and portable media players

Working Principle

The PT8A3305HPE uses a rectifier bridge and a MOSFET to produce a constant current in the inductor, which is then stored as potential energy. When the switch is switched off, the output voltage is regulated by a voltage divider, i.e. the voltage across the inductor is divided into two section – a fixed voltage drop across the MOSFET and a variable voltage drop across the output capacitor. This division of the output voltage allows for the desired output voltage to be adjusted via external resistors.

In order to reduce losses associated with higher-voltage inputs, the PT8A3305HPE uses an internally generated Step-Up/Step-Down converter, which is also adjustable and can be programmed via external resistors. This internal converter can increase the efficiency of the buck regulator by reducing the power loss associated with higher input voltages.

The PT8A3305HPE also includes thermal protection, and can be programmed with a fixed output voltage or a preset voltage level that automatically adjusts according to the measured temperature. Additionally, the circuit includes an Under-Voltage-Lockout (UVLO) feature that prevents the buck regulator from activating until the input voltage has sufficiently corrected.

Conclusion

The PT8A3305HPE is a versatile and high-efficiency step-down DC/DC converter designed for power converters and power management applications. This PMIC offers adjustable output voltages and currents, thermal protection, and Under-Voltage-Lockout, making it suitable for a wide range of applications, such as automotive, telecommunications, and industrial systems. The high efficiency range of 95% makes it suitable for high-current applications. Care must be taken when choosing components for the circuit, as higher input voltages can reduce efficiency if not accounted for properly.

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