ACT4088US-T

PMIC - Voltage Regulators - DC DC Switching Regulators

ACT4088US-T is the latest regulator from Actions Semiconductor that is designed for automotive applications. It is a fully integrated DC-DC switching regulator with a wide range of output voltages, low operating voltage, current measuring and protection features, and improved efficiency. This makes it ideal for applications such as automotive power supply, auxiliary power, and solar cells.

The ACT4088US-T consists of two power stages, an Output Stage and a Reference Stage. The Output Stage provides an adjustable output voltage from 1V to 3.3 volts, with a maximum output current of 2 A. The Reference Stage provides a stable reference voltage with a current capability of 10 mA at 2.5 volts. The regulator also includes integrated current sensing, protection and current limiting features.

The working principle of the ACT4088US-T is based on Pulse-Width Modulation (PWM). PWM is a technique for efficiently controlling the output voltage of a voltage regulator by changing the amount of time the output voltage is on versus the amount of time it is off. This is done by varying the duty cycle of the voltage output signal while keeping the frequency of the signal constant. The regulator then produces a pulse-width modulated (PWM) output voltage, where the higher the duty cycle, the higher the output voltage, and the lower the duty cycle, the lower the output voltage. In this way, the ACT4088US-T provides an efficient way to vary the output voltage to meet varying power supply needs.

The ACT4088US-T employs protection features such as overvoltage protection, current limiting, and fault detection. The overvoltage protection will prevent the output voltage from exceeding its maximum value, thus protecting the associated powered device from damage. The current limiting feature will limit the maximum output current, protecting the device from being overloaded. Finally, the fault detection feature will detect any faults and shut down the regulator to protect from further damage.

A number of additional features are available with the ACT4088US-T, including an on-board temperature sensor, remote shutdown, and short circuit and over temperature protection. The temperature sensor can be used to monitor the temperature of the regulator, and activate additional cooling measures if needed. The remote shutdown feature can be used to remotely shut down the regulator in certain circumstances. Finally, the short circuit and over temperature protection features can protect the device against unexpected overloads and overheating, which can occur during extended periods of use.

In conclusion, the ACT4088US-T is a powerful and versatile DC-DC switching regulator, suitable for a wide range of automotive applications. Its integrated features make it a reliable and efficient choice, providing protection features and the ability to accurately control the output voltage.