LT3045IDD#PBF

Introduction

The LT3045IDD#PBF is a high performance, low-noise Low Dropout (LDO) linear regulator from the LT3045 family. With the advantages of low-noise, high-current, and high-precision, it can be used in a range of applications including precision power supply for analog circuitry and comparators, embedded systems, and data converters.

The LT3045IDD#PBF is a 5V output, 1A device in a SOT-23 package. It has an input operating range from 0.8V up to 16V, and a fixed output voltage of 5V. The device offers low drop-out voltage, low noise, high PSRR, and low quiescent current. It is designed with a wide load range, with minimum drop-out voltage at 1mA load, and is stable with all types of ceramic capacitors. The LT3045IDD#PBF is designed to withstand extreme load and temperature transients and can be used in a wide range of applications.

Application Fields

The LT3045IDD#PBF is an ideal choice for development of robust 5Vdc power supplies across a variety of sectors, including automotive and communications. Its wide input voltage range makes it suitable for applications ranging from low-voltage to high-voltage systems. Its high-current output capability and extremely low-dropout voltage (LDO) makes it a perfect choice for mobile system power, such as battery-powered systems and portable devices, for which it is highly stable and power efficient.

The LT3045IDD#PBF is suitable for precision power supply for analog circuitry and comparators. Its low drop-out voltage and low noise levels make it ideal for high-precision circuits, such as medical equipment, instrumentation equipment, and test & measurements. It is also suitable for high-speed data converters and embedded systems, as it is designed to minimize data errors induced by supply fluctuations.

Working Principle

The LT3045IDD#PBF is a low-noise linear voltage regulator, capable of powering loads over a wide input and output voltage range. The device is designed with a constant-current maximum output limit, providing the versatility to adapt to changing load current requirement. Its wide input voltage range, from 0.8V to 16V, covers most system power requirements. Its low-dropout and low-noise feature make it ideal for high-precision analog applications.

The LT3045IDD#PBF works using a feedback loop, changing the output voltage according to changes in the load. If a load exceeds the maximum output current, the regulator will enter the current limit mode, reducing the output current until the load falls within the rated specifications. The voltage is then stabilized using an internal error amplifier, whose output is compared to the reference voltage output to regulate the output voltage. The output voltage is monitored directly by an external voltage divider which gives feedback to the error amplifier, so that the output voltage can be held within a very small tolerance range.

The LT3045IDD#PBF also features an integrated power detect circuit, allowing the regulator to enter the low-power standby mode when the input voltage is less than 95%, while maintaining the output impedance at a very low level. This feature helps maintain the stability of the regulator during brownout or load disconnection.

Conclusion

The LT3045IDD#PBF is a high performance, low-noise linear voltage regulator from the LT3045 family, with wide input and output voltage range, and low drop-out voltage and noise. Thanks to its constant-current maximum output limit, low-power standby mode, and low-impedance output, it is an ideal choice for powering applications in the automotive, communications, and medical sectors, as well as high-precision analog circuits, data converters, and instrumentation equipment.