NCP4688DSN18T1G

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Power management integrated circuits (PMICs) are devices that provide integrated power conversion functions, to support a range of applications. A linear voltage regulator (LVR) is a special type of PMIC that provides precise voltage regulation by converting an input voltage to a steady output voltage with minimal energy loss, and is very easy to use. NCP4688DSN18T1G linear voltage regulator is one of the most popular LVRs that is used in many design applications today.

Features of NCP4688DSN18T1G Linear Voltage Regulator

NCP4688DSN18T1G is a 3-Terminal Adjustable/Fixed Low Dropout (LDO) linear regulator that is designed primarily for microprocessor/microcontroller based systems. It features a high precision voltage reference and a wide output voltage range of 0.8V to 5.5V. The device also provides a 2.2V load line regulation, which allows it to work with low transient and wide line voltage variations. It also features low quiescent current consumption and space-saving SOT23-6 or SOIC-8 packages, making it ideal for portable applications.

Other features of the NCP4688DSN18T1G include a low dropout voltage of 130 mV a high peak current capability of 1.2 A, a fast transient response of 2 µs, thermal protection, and a reverse standby current protection. The device also provides current and thermal limiting. It undergoes strict quality and environmental testing to ensure all safety standards are met.

Applications of NCP4688DSN18T1G Linear Voltage Regulator

NCP4688DSN18T1G is suitable for applications such as power regulation, battery-powered systems, and portable electronic products. It is also suitable for applications where transient and wide line voltage optimization feature are needed. The high current capability of this LVR makes it ideal for powering microprocessors and other critical system components. It is also ideal for 5V to 3V power conversion in system power distribution (such as a PC, workstation or server).

The NCP4688DSN18T1G is also suitable for applications with space-restricted boards, as it features a compact SOT23-6 or SOIC-8 package. It also has low external parts count, making it easy to design with. Furthermore, the device can be used to provide a simple fixed output or a regulated output set between 0.8V and 5.5V.

Working Principle of NCP4688DSN18T1G Linear Voltage Regulator

The working principle of the NCP4688DSN18T1G is simple. It is designed to convert an input voltage to a steady output voltage with minimal energy loss. It works by monitoring the output voltage level and automatically adjusting the amount of current provided to the load to maintain the output voltage constant. The device also has built-in short circuit protection and reverse bias protection. It is designed to operate with a low supply current, while at the same time providing high output current.

The NCP4688DSN18T1G uses a voltage reference to set the required output voltage level. The voltage reference voltage is taken from the external resistor. A voltage divider formed by two resistors is used to set the desired output voltage. The device also has two internal comparators that compare the output voltage to the reference voltage.

When the output voltage deviates from the reference voltage, the device adjusts the base current of the pass transistor (Q1) to make the output voltage match the reference. This process is called dynamic voltage regulation and it is what maintains the output voltage stable and constant.

The NCP4688DSN18T1G also features an enable/disable pin, which allows the regulator to be switched on or off. The device also has thermal protection and reverse standby current protection.

Conclusion

The NCP4688DSN18T1G is a 3-Terminal Adjustable/Fixed Low Dropout linear regulator. It features high precision voltage reference, low dropout voltage, low quiescent current, fast transient response, current and thermal limiting, and is suitable for applications such as power regulation, battery-powered systems, and portable electronic products. It works by monitoring the output voltage level and automatically adjusting the amount of current provided to the load to maintain the output voltage constant.

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