NCT3521U TR

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NCT3521U TR application field and working principle

NCT3521U TR is a power management integrated circuit (PMIC) produced by Fairchild Semiconductor. It is classified under Power Distribution Switches and Load Drivers. These components are available in SOT-23 package and are used in various types of applications. The NCT3521U TR is designed to provide a low-cost, compact solution for low-voltage power supply and distribution.

General Description

The NCT3521U TR is an integrated power management solution specifically designed for low voltage applications such as microprocessors, memory ICs, and embedded digital logic. It integrates several switching functions, including two general purpose power switches, two power switches to control outputs, and a power supply monitor, which can be used to monitor the supply voltage and enable and disable the output switches. The integrated design simplifies the design of power management schemes by integrating many of the components required for power management into a single chip.

Features

• Two general purpose power switches to control supply voltage.
• Two power switches to control output voltage.
• Power supply monitor to regulate and monitor the output voltage.
• Integrated control logic to enable and disable the power switches.
• Integrated protection circuitry to protect against over current, over voltage and short circuit conditions.
• Compatible with a variety of microcontrollers and embedded digital logic.

Applications

• Embedded Digital Logic.
• Power Management Solutions.
• Low voltage supply and distribution in microprocessors, memory ICs and other digital devices.
• Portable applications.

Working Principle

The NCT3521U TR incorporates two general purpose power switches and two switches to control outputs. The integrated power supply monitor can be used to monitor the supply voltage and enable and disable the output switches. The integrated control logic provides for the control of the power switches and protection circuits. The integrated protection circuitry also offers protection from over current, over voltage, and short circuit conditions.

The power switches are controlled by the control logic, which is supplied by an external microcontroller or other control source. When a low level control signal is applied to the control input of the NCT3521U TR, the appropriate power switch is activated and supplies power to the associated output. When the power switch is activated, the output voltage is regulated by the power supply monitor connected to the output. When the power switch is deactivated, the output voltage is regulated down to the standby level.

The integrated protection circuitry offers protection against over current, over voltage and short circuit conditions. The integrated protection circuitry monitors the supply voltage, the current level and the output voltage. If any of the programmed trip points are exceeded, the power switch is deactivated, thus protecting the load. The protection trip points are programmable via external resistors.

Conclusion

The NCT3521U TR is a low cost, compact solution for low voltage power supply and distribution. It integrates several switching functions, protection circuitry and a power supply monitor into a single chip. It is an ideal solution for applications requiring power supply and distribution such as embedded digital logic, power management solutions and portable applications.

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