Current - Output:	150mA
Base Part Number:	LT1121
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	58dB (120Hz)
Current - Supply (Max):	14mA
Current - Quiescent (Iq):	50µA
Series:	--
Voltage Dropout (Max):	0.7V @ 150mA
Voltage - Output (Max):	30V
Voltage - Output (Min/Fixed):	3.75V
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1121AIS8#TRPBF Application Field and Working Principle

Introduction

The LT1121AIS8#TRPBF is a low-cost and highly efficient fixed-voltage linear voltage regulator from Linear Technology. It is part of their LT11xxA series of regulators and is an ideal choice for applications where precision and efficiency are a priority. With an operating requirement of only 2.5V, the LT1121AIS8#TRPBF has a relatively low dropout voltage compared to other regulators of the same class and offers flexibility for a variety of applications. The LT1121AIS8#TRPBF is a fully integrated linear voltage regulator, capable of supplying up to 500mA at a fixed voltage of 8V, with a maximum dropout voltage of 1.2V and a courteous range of 3V to 16V. The unit delivers smooth and stable voltage regulation in the face of input voltage fluctuations, tight load regulation and excellent transient response. The device also has excellent thermal stability, making it suitable for warm or cold environments.

Features and Applications

The LT1121AIS8#TRPBF offers a modern array of features for a wide variety of applications. The device includes an adjustable current limiting and fast response to overloads, as well as a built-in thermal protection circuit to prevent overheating. Additionally, it features low ripple and noise characteristics and a hysteretic shutdown mode. One of the most common applications of the LT1121AIS8#TRPBF is as a source of power supply in analog- and digital-controlled circuits. It is used in a wide range of application and can be used as a voltage reference or as a series or shunt regulator. Additionally, it is typically used in data converters, power supplies, and in industrial, medical, and automotive applications.

Working Principle

The LT1121AIS8#TRPBF works under the principle of linear voltage regulation. The device has a control input which is compared to an internal reference. This reference is adjustable which allows users to set the voltage that the regulator will maintain. When the incoming voltage exceeds the set reference, the device will adjust the output current to maintain the desired voltage.The LT1121AIS8#TRPBF also includes an overload protection system. This system will activate if the load current exceeds the predetermined limit, as set by the user. When this occurs, the device will shut down, hence protecting the circuit from any damage. The device will then restart automatically after the overload condition has been rectified. In this way, the LT1121AIS8#TRPBF can offer enhanced reliability and safety to an application.

Conclusion

The LT1121AIS8#TRPBF offers an efficient, low-cost solution for both consumer and commercial applications, as it is easy to use and provides good performance. With its adjustable current limiting and fast response, low ripple and noise characteristics, and hysteretic shutdown mode, the device is adaptable for a variety of applications, from industrial, medical, automotive, consumer electronics and data converters. It offers excellent temperature stability and is a great choice for applications where precision and efficiency are a top priority.

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