The R1121N451B-TR is a voltage regulator IC manufactured by Ricoh Electronic Devices Co., Ltd. It's part of their R1121 series, designed for stable voltage supply in various electronic devices. This particular model is a low-dropout (LDO) regulator, meaning it can maintain a stable output voltage even when the input voltage is only slightly higher than the desired output.

Applications

• Power management in portable devices (smartphones, tablets, wearables)
• Voltage regulation for microcontrollers and other digital ICs
• Battery-powered systems
• Wireless communication devices
• Sensor modules

Features

• Output Voltage: 4.5V (fixed)
• Low Dropout Voltage: Typically less than 0.2V at rated current
• High Output Voltage Accuracy: Ensures stable power supply
• Low Quiescent Current: Minimizes power consumption in standby mode
• Overcurrent Protection: Protects the regulator and the load from damage
• Small Package: Available in compact packages for space-constrained applications

Benefits

• Provides a stable and accurate 4.5V power supply for sensitive electronic components.
• Extends battery life in portable devices due to low quiescent current.
• Protects connected devices from overcurrent conditions, enhancing system reliability.
• Enables efficient power management in battery-powered applications.
• Simplifies circuit design with its fixed output voltage and integrated protection features.

Additional Details

The R1121N451B-TR LDO regulator is characterized by its low dropout voltage, allowing it to operate efficiently even with a small difference between the input and output voltages. This is particularly important in battery-powered devices where the battery voltage decreases over time. The regulator’s high output voltage accuracy ensures that the connected devices receive a stable and reliable power supply. The low quiescent current minimizes power consumption in standby mode, further extending battery life. The overcurrent protection feature protects both the regulator and the connected devices from damage due to excessive current draw. This regulator is commonly used in a wide range of portable electronic devices and sensor applications where stable and efficient power management is critical.