LT1521IST-3#TRPBF

The LT1521IST-3#TRPBF is a low dropout (LDO) linear voltage regulator manufactured by Linear Technology Corporation. This device is ideal for high performance and low noise applications. It features a low output noise of 1µVrms and an ultra-low input-output differential voltage of 0.35V. The LT1521IST-3#TRPBF also has high output voltage accuracy of ±2% for 1.2V and 1.5V output versions, and ±3% for other output versions. It provides customers with maximum flexibility, with numerous options for output voltage, temperature range, and package size. The LT1521IST-3#TRPBF provides a wide variety of additional features, such as low quiescent current, high power supply ripple rejection ratio, and over-temperature protection.

Application Field

The LT1521IST-3#TRPBF is designed for a wide variety of applications. It is suitable for powering digital systems and analog circuits in consumer and industrial electronics, automotive systems, and communications systems. This device is particularly suitable for portable computing, medical and metering systems, and battery powered equipment. The LT1521IST-3#TRPBF is also ideal for use in power amplifiers, Server and Telecom power supplies, as well as powering motion control systems.

Working Principle

The LT1521IST-3#TRPBF operates through the principle of linear voltage regulation. This device features a low dropout (LDO) architecture which regulates a given output voltage from an input voltage that is only slightly higher than the output voltage. This is achieved by dissipating some of the excess input power as heat. The LT1521IST-3#TRPBF device utilizes a resistor divider network and pass transistor to regulate its output voltage. The device incorporates an internal voltage reference, which is compared to the output voltage through the feedback network. When the output voltage is not equal to the reference voltage, the error amplifier senses the difference and adjusts the current through the pass transistor until the output voltage is equal to the reference voltage. This allows the device to maintain a constant output voltage, regardless of changes in input voltage or load current.

The LT1521IST-3#TRPBF features wide input/output operating voltage range, which is beneficial for automotive and communication system applications. Also, this device offers a low quiescent current at 1µA and a wide temperature range from -40 °C to 125 °C operation. This device is also well suited for battery-operated systems due to its low quiescent current and the high current output. Furthermore, the LT1521IST-3#TRPBF has high power supply ripple rejection ratio of 75 dB and over-temperature protection for a safer operation of the system.

In conclusion, the LT1521IST-3#TRPBF is an ideal choice for low noise and high performance linear voltage regulator applications. It provides a wide variety of features, such as wide input/output voltage range, low quiescent current and over-temperature protection. Furthermore, this device offers high power supply ripple rejection ratio and excellent output voltage accuracy, making it suitable for many different applications.