LF50CPT-TR Integrated Circuits (ICs)

The LF50CPT-TR is a three terminal adjustable low dropout linear regulator, designed for microprocessor/controller applications and low voltage, low current applications. It is designed to bestable and tough, with low ripple and low total supply current. The device features over temperature and over current protection, with programmable under voltage lock-out. It also features power up sequencing. This device is available in both standard pin-out packages and the special pin-out to accomodate the tight space requirements in cellular phones, PDAs and other mobile products.

Features and Benefits

• Very low dropout voltage
• Low quiescent current
• Stable with ceramic output capacitors
• Output current up to 1.5A
• Current and thermal protection
• Soft-start capability

Application Fields

The LF50CPT-TR is most suitable for microcontrollers and data conversions requiring low quiescent current with low dropout voltage. It can provide power to systems with high capacitive loads or in applications where portability is important. It can also be used to provide power to RF transmitters/receivers and other applications requiring very low quiescent current. It is also specially designated as a low standby current regulator to extend battery life in mobile phone applications.

Working Principle

The LF50CPT-TR operates on a simple principle. It uses a low dropout voltage PNP transistor, which is connected between the output and the input. As the input voltage increases, the PNP transistor turns on, increasing the current flow to the output. This causes the output voltage to drop until it reaches the desired value set by the reference voltage. When the current from the input source is greater than the current from the output, the output voltage stops dropping, and the device enters regulation. The device also has over temperature and over current protection, to ensure the device stays within safe operating parameters necessary for reliability.

Conclusion

The LF50CPT-TR is a low dropout linear regulator, designed for applications which requires low quiescent current and low dropout voltage. It is ideal for applications such as micro controllers and data conversions and can provide power to high capacitive loads or systems requiring portability. With over temperature and over current protection, it is a reliable and robust solution for a variety of applications.