LT1121IS8#TRPBF

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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Introduction

LT1121IS8#TRPBF is a linear voltage regulator from the PMIC - Voltage Regulators series. It provides 8V output with guaranteed accuracy, low noise and ripple rejection. It operates in a single-ended input voltage range from 5V to 18V with an output current up to 200mA. The LT1121IS8#TRPBF offers the following features: • Guaranteed output accuracy of 8V with an input-output differential of 0.5V• Low quiescent current of 65mA• Fast transient response time of 0.1μs• Low noise and ripple rejection• Internal compensation• Internal thermal protection• Thermal shutdown• Overvoltage protection

Applications

The LT1121IS8#TRPBF is a versatile linear regulator that can be used in a wide range of applications. It can be used in battery-powered electronics, automotive systems, data converters, and portable and wireless electronic devices. It can also be used in communication systems, instrumentation, telecommunication and broadcast networks, and test and measurement systems.

Working Principle

The LT1121IS8#TRPBF is a linear voltage regulator that works by converting an input voltage (Vin) to a specified output voltage (Vout). It uses a 3-terminal voltage regulator, which consists of an input, an output and a ground terminal. When the input voltage (Vin) is greater than the output voltage (Vout), the regulator reduces the input voltage by a controlled amount so the output voltage is equal to the desired voltage (Vout). This is achieved by the voltage regulator constantly monitoring the output voltage and adjusting the input in order to maintain the output within the specified limits. The voltage regulator works in an open-loop configuration, meaning that it uses feedback to measure and adjust the input voltage. It consists of an error amplifier that constantly compares the output voltage and the reference voltage. If the output voltage differs from the reference voltage, the error amplifier generates an output signal which then controls the output voltage by using a Transistor-Transistor-Logic (TTL) output stage. The input voltage (Vin) is then adjusted until the output voltage (Vout) is equal to the desired voltage. The LT1121IS8#TRPBF has an adjustable current limit feature, which allows for an adjustable peak current limit. This protects the voltage regulator from excessive input current, which ensures that the output voltage is never exceeded. The voltage regulator also has a thermal shutdown feature which protects the device from thermal damage by automatically shutting off when the temperature becomes too high.

Conclusion

The LT1121IS8#TRPBF is a linear voltage regulator from the PMIC - voltage regulators series that offers guaranteed output accuracy of 8V with an input-output differential of 0.5V, low quiescent current of 65mA, fast transient response time of 0.1μs, and low noise and ripple rejection. Its versatile design enables it to be used in a wide range of applications such as battery-powered electronics, automotive systems, data converters and portable and wireless electronic devices. The voltage regulator works in an open-loop configuration and consists of an error amplifier, a TTL output stage and adjustable current limit feature that allows for an adjustable peak current limit. The device also has a thermal shutdown feature.

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