LP3917RLX-Q/NOPB

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LP3917RLX-Q/NOPB is a power management integrated circuit (PMIC) designed to regulate voltages and monitor the power supplied to certain devices. The application field of the device is specialized, allowing it to be used in a wide variety of applications. This guide details the working principle and application field of the LP3917RLX-Q/NOPB.

Working Principle

The LP3917RLX-Q/NOPB provides a voltage regulation function whereby V OUT is regulated according to a pre-defined threshold and a reference voltage V REF . It works by comparing the reference voltage with the voltage output, with the voltage difference driving an error amplifier. Depending on the threshold set by the user, the output voltage is regulated accordingly. The output voltage is limited to the reference voltage VREF plus or minus a given amount, with the current limit feature providing the maximum current through the output. In addition to voltage regulation, the LP3917RLX-Q/NOPB also provides over-current protection by limiting the current flow through the device. If overload conditions are detected, the device will shut down to prevent damage from occurring.

The LP3917RLX-Q/NOPB also features built-in thermal protection. This feature works by monitoring the junction temperature of the device, with the thermal protection circuit automatically shuttering down the device when it reaches a pre-defined temperature. This is done to prevent damage due to excess heat.

Application Field

The LP3917RLX-Q/NOPB is designed to regulate and monitor power in a wide range of applications, such as laptop and desktop computers, consumer electronic devices, communications systems, home appliances and industrial systems. Due to its low voltage down to 2.5V and up to 15V, wide load current range from 0 to 25mA, low supply current and top accuracy up to 2% of error at the reference voltage of 10V, it is the ideal choice for the power supply for embedded controllers, the following types of applications.

• Laptop Adaptors
• Universal Serial Bus (USB) Powered Devices
• Telecommunications Equipment
• Portable Electronic Devices
• Power Tools
• Network Infrastructure Infrastructure
• Home Automation & Security Equipment
• Industrial Controllers & Monitors

In addition to providing a wide range of current output, the LP3917RLX-Q/NOPB also features features such as a digital power-on/off (POR) latch, to safely power down the circuit when the device is not being used, and resistor-programmable current limiting, to prevent overloads and other problems.

Conclusion

The LP3917RLX-Q/NOPB is a specialized power management integrated circuit (PMIC) designed to regulate and monitor power supply in a variety of applications. Its wide range of current output, low voltage requirements and top accuracy make it the perfect choice for embedded controller applications. The device also features built-in thermal protection, over-current protection and a digital power-on/off (POR) latch, to safely shut down the circuit when not in use.

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