NCP4682HMU33TCG

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The NCP4682HMU33TCG is a linear voltage regulator (also known as a low dropout or LDO regulator) from ON Semiconductor. It is a monolithic integrated circuit that is specially designed for applications requiring low dropout operation with very good stability of output voltage. The device combines a precision voltage reference, current source, error amplifier, and low reduction voltage switch, providing excellent performance and features for low noise and low ripple operation.
The NCP4682HMU33TCG voltage regulator has a wide input voltage range of 3V – 32V and a wide output voltage adjustable range of 0.8V - 29V. Its breakthrough output current is 3A and can provides up to 600 mA of output current. It has a very low dropout voltage, typically 25 mV @ 300mA, and provides a very low noise operation with 70 μVRMS on the output. The device is also very stable, providing a low line and load variation of 0.05%.
The NCP4682HMU33TCG comes in a TQFN-6 package, and has a wide range of features, including a low quiescent current of 10 µA, as well as over-temperature protection, under-voltage lockout, and current limit for stable operation. The device also includes an enable pin for very low power consumption when in shutdown mode. It is well-suited for use in applications such as hand-held battery-powered products, medical and industrial instruments, PC motherboards, multimedia, and consumer audio equipment.
To understand how the NCP4682HMU33TCG voltage regulator works, we need to review how linear voltage regulation is achieved. Voltage regulation is accomplished by a series of series and/or parallel circuits that measure the output voltage, compare it to a reference voltage, and then adjust the output voltage as necessary to match the reference voltage. To start, the device needs to convert the input voltage into a stable reference voltage which can then be used to compare against the output voltage. Generally, this reference voltage is created by a Zener diode, a diode-connected transistor, or a resistor divider network. The reference voltage can then be compared to the output voltage via an error amplifier, which will adjust the output voltage as needed to make the difference between the two voltages as close to 0 as possible. Once the output voltage matches the reference voltage, the error amplifier will hold its output steady and thus maintain the output voltage. This is the basic operation of linear voltage regulation.
The NCP4682HMU33TCG voltage regulator combines all of the elements of linear voltage regulation into one integrated circuit. Its main components include a Zener diode, current source, error amplifier, low dropout voltage switch, enable pin, and thermal protection. The precise voltage reference, current source, and error amplifier all work together to adjust the output voltage which is then monitored by the low reduction voltage switch. This switch will ensure that the voltage does not drop below the specified setpoint and will shut off when necessary. The enable pin is included to conserve power by disabling the device when it is not needed. Lastly, the thermal protection protects the device from overheating by preventing excessive current from flowing when the temperature exceeds its rated limit.
In conclusion, the NCP4682HMU33TCG voltage regulator is a great choice for use in applications where low dropout operation with very good stability of output voltage is required. It offers a wide range of features, including over-temperature protection, under-voltage lockout, and current limit, which make it very suitable for use in hand-held battery-powered products, medical and industrial instruments, PC motherboards, multimedia and consumer audio equipment. Its combination of precision voltage reference, current source, and error amplifier, as well as its low dropout voltage switch make it an ideal choice for applications that require precise voltage regulation and low power consumption.

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