LT3009EDC-3.3#TRPBF

LT3009EDC-3.3#TRPBF Application Field and Working Principle

The LT3009EDC-3.3#TRPBF is a low dropout linear voltage regulator composed of three terminals. It has a wide input voltage range from 3.3V to 40V, and can provide 3.3V regulated output voltage. It is widely used for applications including post regulators in DC-DC converters, battery powered systems, docking ports, and many other applications. It can also be used as a replacement for fixed regulators in many applications, such as the LT019X and LT019Y series.

Features

• Wide Adjustable Output Voltage Range: 3.3V to 40V
• High Efficiency (Up to 99%)
• High Operating Current: 1A
• Low Quiescent Current: 6.5 mA
• Low Output Noise: 15 uV
• Adjustable Shutdown: Off, 10%, 90%, 100%
• Built-in Thermal Protection

Applications

• Post-Regulators for DC-DC Converter
• Battery-Powered Systems
• Docking Ports
• Replacement for Fixed Regulators in Many Applications

Working Principle

The working principle of LT3009EDC-3.3#TRPBF is based on a negative voltage regulator by using a feedback loop to regulate the output voltage. The LT3009EDC-3.3#TRPBF has a precise reference voltage, which is divided by a resistor divider to generate a precise reference voltage. The reference voltage is compared with the feedback voltage to detect any differences. When the feedback voltage exceeds the reference voltage, the error amplifier will increase the current through the pass element to reduce the output voltage and make the output voltage to approach the reference voltage. If the feedback voltage is lower than the reference voltage, the error amplifier will sense this and decrease the current through the pass element to increase the output voltage and make it approach the reference voltage.

The LT3009EDC-3.3#TRPBF is designed with a built-in thermal protection circuit. The thermal protection circuit can detect the temperature of the die and will shut down the circuit when the die reaches a certain temperature, thus protecting the circuit from any damage.