The RP111L331B-TR is a low-dropout (LDO) regulator manufactured by Nisshinbo Micro Devices Inc. This LDO regulator is designed to provide a stable and accurate output voltage from a higher input voltage, even when the input voltage is close to the desired output voltage. It is characterized by its low quiescent current and high ripple rejection, making it suitable for battery-powered and noise-sensitive applications.

Applications

• Battery-powered devices (e.g., smartphones, tablets, wearables)
• Wireless communication devices (e.g., Bluetooth modules, Wi-Fi modules)
• Portable audio players
• Sensor modules
• Microcontroller power supplies

Features

• Low dropout voltage (typically 150 mV at 300 mA)
• Low quiescent current (typically 6 μA)
• High ripple rejection (typically 70 dB at 1 kHz)
• Overcurrent protection
• Thermal shutdown protection

Benefits

• Extends battery life in portable devices due to its low quiescent current
• Provides a stable and noise-free power supply for sensitive circuits
• Protects the regulator and the powered device from damage due to overcurrent or overtemperature conditions
• Simplifies the design process with its integrated protection features
• Ensures reliable operation in a wide range of applications

Additional Details

The RP111L331B-TR provides a fixed output voltage of 3.3V. It typically operates on an input voltage range of 1.7V to 5.5V. The low dropout voltage allows the regulator to maintain a stable output voltage even when the input voltage drops close to the output voltage. The low quiescent current minimizes the power consumption of the regulator itself, extending battery life. The high ripple rejection effectively filters out noise and ripple from the input voltage, providing a clean power supply to the load. The overcurrent protection limits the output current to prevent damage to the regulator and the load. The thermal shutdown protection shuts down the regulator when the junction temperature exceeds a certain threshold. The device is typically available in a small SOT-23 or DFN package. External capacitors are required for input and output filtering. The datasheet provides detailed information on recommended operating conditions, electrical characteristics, and application circuit examples. The RP111 series also includes other voltage options to meet different application requirements. Proper layout and decoupling techniques are essential for achieving optimal performance and minimizing noise.