LT1121CN8-3.3#PBF

Current - Output:	150mA
Base Part Number:	LT1121
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Mounting Type:	Through Hole
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):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	30V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tube

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## IntroductionLT1121CN8-3.3#PBF is the upgraded version of the LT1121 linear voltage regulator by Analog Devices designed to small form factor applications. The device features low quiescent current and an extended input voltage range of up to 36 V without compromising EMI performance. The LT1121 is a simple, low power regulator capable of producing 1.25mA of output current with excellent line and load regulation characteristics. The device meets the basic needs of mobile applications and consumer electronics requiring efficient, low-dropout voltage regulation with extremely low quiescent current. It captures the best of both linear and switched-mode technologies to create new levels of efficiency and reliability.## Application FieldThe LT1121CN8-3.3#PBF is ideally suited for a wide range of battery-powered and other portable applications. The device includes current limiting for protection against battery over-discharge or short-circuit. The high ripple rejection ratio of 75 dB improves dynamic response. The device is also well suited for high-current step up applications.The LT1121CN8-3.3#PBF is a versatile regulator, ideal for applications such as voltage conversion, power management, batteries, and medical applications. Its low quiescent current and high efficiency make it ideal for energy-sensitive applications such as portable electronics and automotive systems.## Working PrincipleThe LT1121CN8-3.3#PBF works by using negative feedback to continuously compare the output voltage with a reference voltage and then adjusting the operating current and voltage levels of output devices to produce a stable output voltage. The output voltage is limited by an internal current limiting and short-circuit protection circuit.When the LT1121CN8-3.3#PBF is powered up, the voltage adjust circuit ensures the output voltage is set to the required level. When the output voltage fluctuations, the feedback comparator monitors the change and modulates the output for stability.The basic components of the LT1121CN8-3.3#PBF include the NPN transistor, a control head, the voltage regulator, and the current limitation circuit. The NPN transistor is responsible for producing in the device’s ground-referenced signal, while the control head maintains the level of the output voltage. The voltage regulator acts as a buffer, while the current limitation circuit maintains the overcurrent protection.The LT1121CN8-3.3#PBF also features a high-impedance voltage divider to reduce the noise at the device’s input. This helps to guarantee the high accuracy of the device and maximizes the performance.## ConclusionThe LT1121CN8-3.3#PBF is a versatile, low-power regulator that offers excellent line and load regulation characteristics and can be used in a wide range of portable and automotive applications. The device features low quiescent current, excellent line and load regulation characteristics, and an extended operating temperature range allowing it to be used in challenging operating environments. Features such as current limiting and low-noise voltage divider add value to the device and improve the overall performance. This makes the LT1121CN8-3.3#PBF an ideal choice for different types of applications.

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