LT1129CS8-3.3#TRPBF

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LT1129CS8-3.3#TRPBF Application Field and Working Principle

LT1129CS8-3.3#TRPBF is a Linear Voltage Regulator designed for high-performance, low-power, low-dropout, and SOT-223 package applications. Its high performance, very low dropout voltage of only 200mV, and very low supply current makes it ideal for battery-powered systems. LT1129CS8-3.3#TRPBF offers very low quiescent current, good thermal performance and peace of mind, with undervoltage lockout (UVLO) protection, short-circuit protection and thermal protection.

Application Field

The LT1129CS8-3.3#TRPBF is a versatile Linear Voltage Regulator, which is suitable for a wide range of applications that include but not limited to handheld and portable electronics, such as mobile phones, digital cameras, electric appliances, and industrial control systems. Many designs use the LT1129CS8-3.3#TRPBF underneath their power system to offer additional stability and reliability.

Working Principle

The LT1129CS8-3.3#TRPBF is built with advanced operational amplifier, a trusted P-channel MOSFET, and a precision voltage reference. It provides an accurate and stable output voltage with an adjustable current limit to provide over-current protection. The output voltage is set precisely by an external resistor divider and its internal reference voltage. The LT1129CS8-3.3#TRPBF is designed to have a very low-dropout voltage compared to other voltage regulators, and the dropout voltage can be even lower than the output voltage.

When the input voltage is higher than the output voltage, the control loop in LT1129CS8-3.3#TRPBF regulates the output voltage. The P-channel MOSFET becomes more conductive to pass more current. The input current is then divided between the MOSFET and the onboard current limit circuit, where the current limit circuit is designed to maintain a constant current to the P-channel MOSFET. This will limit the current delivered to the load, so that the output voltage remains relatively constant.

The LT1129CS8-3.3#TRPBF also provides a very low quiescent current, which can reduce power consumption and improve system efficiency. The device has an output voltage range from 3V to 4.85V and can deliver up to 200mA of output current. It is also equipped with undervoltage lockout (UVLO) protection, short-circuit protection and thermal protection to ensure its safe use.

Conclusion

The LT1129CS8-3.3#TRPBF is a high-performance, low-power, low-dropout, SOT-223 package Linear Voltage Regulator. It is suitable for various portable and digital devices, providing precise, stable and a low dropout voltage performance. The device has thermal protection and a very low quiescent current, making it a reliable and efficient solution for battery-powered systems.

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