LT1129IST-3.3#PBF

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LT1129IST-3.3#PBF is a low dropout three-terminal regulator designed specifically for applications that use an output voltage between 3.3 and 5 volts. This regulator is especially suitable for providing a supply for 1.2 Volt microprocessors, and may also be used for a variety of other applications where a ±0.5% line and load regulation is required. Its output voltage accuracy is 1.2% at nominal input voltage and ambient temperature.

The LT1129IST-3.3#PBF is a precision voltage regulator designed to provide quality voltage regulation and low level noise in a very small SOT223 or TO-263Pac package. This regulator is designed to drive up to 1.5 A of output current and is specifically designed for switching regulators and microcomputers. Its very low dropout voltage permits operation down to 3.3 Volts and makes it suitable for mobile and other low voltages where the line regulation accuracy is significantly affected by the input voltage. The low quiescent current of 24 µA makes it suitable for portable and battery-powered applications. It also has excellent load and line regulation.

The LT1129IST-3.3#PBF is a three-terminal linear regulator working on feedback principle. This device uses an NPN power transistor and two external resistors to regulate the output voltage. One of the external resistors sets the nominal output voltage, while the other adjust the current that sources through the power transistor to track any changes in the input voltage. If a change in the input voltage causes an overvoltage on the output, the feedback opens the power transistor to cut the sourcing current and thus allowing the output voltage to drop. Conversely, a drop in the input voltage reduces the sourcing current and increases the output voltage.

The main feature of the LT1129IST-3.3#PBF is its low dropout voltage which is suitable for supplying 1.2 Volt microprocessors. This unit is also well suited for use with other low voltage applications where the line regulation accuracy is significantly affected by the input voltage. The device is available in two package styles that offer good board layout versatility in high density designs. Also it is specially designed for automatically compensating for temperature variations to ensure consistency of the output voltage over a wide range of temperatures.

The LT1129IST-3.3#PBF can be used in a wide variety of applications such as providing power to microcontrollers, providing a stable output voltage for laser diode drivers, powering LED drivers, powering instrumentation, powering automotive electronics and much more. The low dropout voltage and full 0.5% line and load regulation make the LT1129IST-3.3#PBF a cost effective solution for many applications.

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