LT1121CST-5#TRPBF

LT1121CST-5#TRPBF Application Field and Working Principle

The LT1121CST-5#TRPBF is a high-performance low-dropout (LDO) linear regulator developed by Linear Technology. It is a member of the PicoStar™ Family of low dropout (LDO) linear regulators, which are designed to replace bulky switching regulators in high performance systems and power supply designs. The device offers a wide range of output voltages, combined with fast transient response, extremely low output noise and quiescent current, and high PSRR, making it ideal for a wide range of applications such as medical imaging, processor power supplies, RF power amplifier boosting and digital/IC power supply systems.

Application Fields

The LT1121CST-5#TRPBF is a versatile LDO that is capable of providing ultra-low dropout and low noise operation. It is well-suited for a broad range of demanding high current applications where the need for low output noise and high precision is paramount. Examples include RF power amplifiers, medical imaging power supplies, wireless handsets, battery-powered portable equipment, computer systems, industrial instrumentation, process control systems and data acquisition systems, just to name a few.

Working Principle

The LT1121CST-5#TRPBF is a low-dropout (LDO) linear regulator which is designed to reduce the noise generated in the output voltage of a power supply. The dropout voltage of the device, which is the voltage difference between the output and the regulated voltage, is typically only 0.25V at 1A. This makes it ideal for high current applications where the need for low output noise is essential. The device is capable of providing a precisely regulated output voltage of up to 5V with a tolerance of ±0.15% over line and temperature, and with a minimum load of 1mA.

The LT1121CST-5#TRPBF features a low output noise, high PSRR and a fast transient response time. Its fast response time makes it well-suited for demanding applications where the output voltage needs to quickly follow an input voltage spike. The device also features a wide input voltage range, from 4.5V up to 16V, making it an ideal choice for demanding high power supply applications.

The LT1121CST-5#TRPBF is available in the popular SOT-223, TSOT-223 and MSOP-8 packages, making it suitable for a wide range of application requirements. The device is also internally protected against reverse current, reverse polarity operation, and thermal overload. This makes it very robust and reliable, which is essential for applications such as in medical imaging power supplies or RF power amplifier boosting.

In summary, the LT1121CST-5#TRPBF is an ideal solution for demanding high current applications where tight regulation and high precision output voltage is required. It is highly versatile, as it is available in a variety of package sizes and has a wide input voltage range, while still providing features such as low dropout voltage, low output noise, high PSRR and fast transient response time.