LT1761IS5-SD#TRMPBF

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PMIC - Voltage Regulators - Linear: LT1761IS5-SD#TRMPBF Application Field and Working Principle

PMIC (Power Management ICs) are integrated circuits that are designed to manage power flow in various types of systems, such as embedded systems, computer systems, and communication systems. Voltage regulators are one type of PMICs and are used to regulate the voltage output by an AC/DC power source. Linear voltage regulators are a type of voltage regulator that operates by controlling the magnitude of a linear output to a specified value. The LT1761IS5-SD#TRMPBF is a 3V to 20V adjustable linear voltage regulator with a maximum output current of 500mA, suitable for a variety of applications such as battery powered devices, low noise circuits, and low minimum input voltage systems.

Application Field

The LT1761IS5-SD#TRMPBF has a wide range of applications due to its wide adjustable output voltage range, high current capability, and low minimum input voltage (<1.7V). It is suitable for battery-powered devices as it can work with a higher input voltage range and lower input voltage range. It can achieve high efficiency and its low working voltage can help save power and extend battery life. Its strong short-circuit protection ability makes it suitable for use in low noise circuits such as automotive circuits, telecom circuits, and medical device circuits. It is also suitable for use in low minimum input voltage systems.

Working Principle

The LT1761IS5-SD#TRMPBF is a 3-pin linear voltage regulator. It has an output voltage range of 3V to 20V, making it suitable for a variety of applications. It has a high current capability and low minimum input voltage. The internal circuit of the LT1761IS5-SD#TRMPBF is shown in the figure.

The circuit consists of an input regulator circuit and an error amplifier circuit. The input regulator circuit consists of an N-channel enhancement-mode MOSFET, R1 and R2. The MOSFET acts as a switch and will turn off and on depending on the input voltage. The MOSFET is switching between 0V and R1 when different input voltage is applied. The voltage drop across R2, the emitter resistor of the transistor, will be equal to Vout. The current flowing through R2 is equal to the drain current of the MOSFET.

The error amplifier circuit compares the voltage drop across R2 to the feedback voltage, which is a preset reference voltage. If there is a difference between the two voltages, the amplifier output will adjust the gate voltage of the MOSFET to turn it on or off, thereby controlling the voltage of the output. This allows the circuit to regulate the output voltage, despite changes in input voltage or load current.

Conclusion

The LT1761IS5-SD#TRMPBF is a 3V to 20V adjustable linear voltage regulator with a maximum output current of 500mA. It is suitable for a wide range of applications, such as battery-powered devices, low noise circuits, and low minimum input voltage systems. The circuit consists of an input regulator circuit and an error amplifier circuit. The input regulator circuit consists of an N-channel enhancement-mode MOSFET, R1 and R2. The error amplifier circuit compares the voltage drop across R2, to the feedback voltage, and adjusts the gate voltage of the MOSFET to turn it on or off, thereby controlling the voltage of the output.

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