LF18CPT

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LF18CPT Application Field and Working Principle

LF18CPT is a series of linear voltage regulator manufactured by Linear Technology Corporation. It is designed to regulate the output voltage of a variety of different devices, including power supplies, DC motors, and batteries. This voltage regulator is capable of regulating output voltages from 3V to 7V with a typical line regulation of 0.08%/V and load regulation of 0.4%/mA. The temperature range for this series is -20°C to +125°C. It is available in a H package with a dropout voltage of 1V for 20mA load current and a maximum input to output differential of 1.5V.

Features

• 3V to 7V output voltage range
• 0.08%/V typical line regulation
• 0.4%/mA typical load regulation
• A temperature range of -20°C to +125°C
• H package with dropout voltage of 1V for 20mA load current
• Maximum input to output differential of 1.5V

Applications

• Power supplies
• DC motors
• Batteries
• Card readers
• Backlighting
• Portable medical equipment
• Portable electronics
• Wireless communications

Working principle

The LF18CPT is a linear voltage regulator which works by controlling the output voltage by adjusting the input supply (otherwise known as the reference voltage). The reference voltage is obtained from a separate power source, such as a battery. This reference voltage is used to control the voltage drop across a series of resistors, which will determine the output voltage. The voltage regulator will then adjust the input voltage as needed in order to maintain the desired output voltage. The LF18CPT operates by constantly measuring the input and output voltage and adjusting the reference voltage accordingly within the specified operating range.

The LF18CPT also has a number of built-in features and protections to help provide reliable operation. These features include short-circuit protection, in-rush current limiting, thermal overload protection, and reverse-current protection.

Conclusion

The LF18CPT series of linear voltage regulators is designed to regulate the output voltage of a variety of devices, including power supplies, DC motors, and batteries. It is capable of regulating an output voltage from 3V to 7V with a typical line regulation of 0.08%/V and a load regulation of 0.4%/mA. It also has a number of built-in features and protections to help provide reliable operation. This makes the LF18CPT a great choice for applications such as power supplies, DC motors, batteries, card readers, backlighting, portable medical equipment, portable electronics and wireless communications.

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