AS1359-BTTT-25

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AS1359-BTTT-25 is an advanced linear regulator that provides a low-cost solution for applications such as motor starting, AC/DC line powered voltage conversion, switching power supplies and battery powered designs. It is designed to replace more expensive fixed and adjustable linear regulators.

The AS1359-BTTT-25 offers a low quiescent current, excellent line and load regulation, fast transient response time and low thermal stress. It features a temperature range of -40°C to +85°C and a maximum output accuracy of ±2%. The specified input voltage range is from 0.6V to 36V, making it a great choice for a wide range of applications.

Application Field

The AS1359-BTTT-25 offers low quiescent current, fast transient response time, excellent line and load regulation, and is able to deliver up to 25 mA of current. This makes it well suited for use in a variety of DC-DC and AC-DC voltage conversion applications, as well as in motor starting and battery powered designs. The regulated output voltage is selectable from 1.5V to 36V and can be adjusted, allowing designers to tailor the solution to their specific application.

This regulator is especially well suited for use in systems that require low power dissipation, such as digital data acquisition, embedded controllers and low-power logic. It is also ideal for UPS systems, data loggers, laser pointers and medical devices.

Working Principle

The AS1359-BTTT-25 regulator operates by comparing the level of the control voltage at the input with a reference voltage set by the user. When the input voltage exceeds the reference voltage, the regulator will shut off its output by driving a P-channel MOSFET. The MOSFET has a relatively low on-resistance, minimizing wasted energy. During normal operation, the MOSFET is open, allowing the input voltage to be regulated down to its programmed level.

To regulate the output current, the circuit utilizes an internal error amplifier to detect changes in the output voltage. If the output voltage increases or decreases by more than a given amount, the amplifier will reduce or increase the gate voltage of the regulation MOSFET, respectively, until the output voltage returns to its programmed level. This process is called "foldback current limitation" as the MOSFET will adjust the current going through it to maintain the set output voltage.

The AS1359-BTTT-25 regulator also features a "Thermal Protection" feature. When the device’s temperature reaches a certain level (120C), the internal thermal sensor will shut off the output. This feature ensures that the regulator does not become over-heated and damaged.

Conclusion

The AS1359-BTTT-25 regulated is a low-cost, low-quiescent current, linear voltage regulator designed for a wide range of applications. It offers excellent line and load regulation, fast transient response time and low thermal stress. The device is also equipped with a thermal protection feature to protect against overheating. Its wide input voltage range and output voltage range make it perfect for use in motor starting, AC/DC line powered voltage conversion, and battery powered designs.

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