LT1121CS8#PBF

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:	0°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:	Tube

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LT1121CS8#PBF Application Field and Working Principle

PMIC - Voltage Regulators - Linear The LT1121CS8#PBF is a microprocessor supervisor circuit that provides excellent reset accuracy in both stand-alone and microprocessor-based systems. The LT1121CS8#PBF is a monolithic microprocessor supply supervisory device consisting of a precision voltage reference and a comparator. Its full temperature range is -40°C to 85°C. It offers pin selectable reset thresholds consisting of active-high and active-low reset output configurations and an adjustable reset timeout period.

Features of the LT1121CS8#PBF

The LT1121CS8#PBF offers a variety of features that make it an ideal choice for applications that require high-accuracy reset monitoring. It includes very low power consumption, a pin selectable reset threshold voltage, manual reset input, debounced manual reset input, and integrated circuits for optional open circuit detection.

Applications of the LT1121CS8#PBF

The LT1121CS8#PBF is suitable for a variety of applications including microprocessors, automotive, consumer, and industrial applications. It is especially suited for microprocessor and controller applications as a well-accurate reset supervisor. It is also used to monitor battery level in automotive applications and to ensure system integrity in consumer applications. In an industrial setting, the LT1121CS8#PBF is used to maintain reset accuracy under extreme temperature conditions.

Working Principle of the LT1121CS8#PBF

The LT1121CS8#PBF is a precision voltage reference supervisor that operates on a simple yet effective principle. It has an internally generated 0.8V voltage reference, and a comparator that monitors the reference voltage and compares it with input voltages. When the input voltage is higher than the 0.8V reference voltage, an active-high reset signal is generated and it is maintained as long as the voltage is higher. If the input voltage drops below the 0.8V reference, the active-high signal is removed. Similarly, an active-low reset signal is generated when the input voltage is lower than the 0.8V reference voltage, and maintained as long as the voltage is lower.

Conclusion

The LT1121CS8#PBF is an excellent choice for microprocessor-based systems that require high accuracy reset monitoring. Its pin selectable reset thresholds, low power consumption, and integrated circuit design make it suitable for numerous applications, ranging from automotive and consumer products to industrial settings. Its simple yet effective working principle ensures accurate and reliable reset functioning under all temperature conditions.

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