The RT9161-42PX is a high-performance, low-dropout (LDO) voltage regulator manufactured by Richtek. It is designed to provide a stable and accurate output voltage, even with variations in input voltage and load current. This regulator is particularly well-suited for battery-powered applications and portable devices where efficiency and space are critical.

Applications

• Portable Electronics: Such as smartphones, tablets, and MP3 players.
• Wireless Communication Devices: Including Bluetooth modules, Wi-Fi modules, and other RF devices.
• Battery-Powered Equipment: Such as digital cameras, handheld games, and portable medical devices.
• Microcontroller Power Supplies: Providing a stable voltage source for microcontrollers and other digital logic circuits.
• Post-Regulation for Switching Regulators: Improving the output ripple and noise performance of switching power supplies.

Features

• Low Dropout Voltage: Ensures stable output voltage even when the input voltage is close to the output voltage.
• High Output Accuracy: Provides a precise and stable output voltage, typically within ±2%.
• Low Quiescent Current: Minimizes power consumption in standby mode, extending battery life.
• Over-Current Protection: Protects the regulator and connected circuitry from damage due to excessive current draw.
• Over-Temperature Protection: Shuts down the regulator in the event of overheating, preventing thermal damage.
• Short-Circuit Protection: Protects the regulator from damage due to short circuits at the output.
• Enable/Disable Control: Allows the regulator to be turned on or off externally, further reducing power consumption.
• Small Package Size: Typically available in small surface-mount packages, saving valuable board space.
• Fixed Output Voltage: 4.2V Output Voltage.

Benefits

• Extended Battery Life: The low quiescent current and high efficiency of the RT9161-42PX contribute to longer battery life in portable devices.
• Improved System Reliability: The over-current, over-temperature, and short-circuit protection features enhance the reliability of the overall system.
• Reduced Board Space: The small package size allows for more compact and densely populated circuit boards.
• Stable Power Supply: The high output accuracy and low dropout voltage ensure a stable and reliable power supply for sensitive electronic components.
• Simplified Design: The integrated protection features and enable/disable control simplify the design process and reduce the number of external components required.

The RT9161-42PX is typically used in applications where a stable 4.2V supply is needed from a slightly higher voltage source. It's common in Li-Ion battery-powered devices due to the close match of the output voltage with the battery's fully charged state. The specific package is typically a small, thermally efficient package, allowing for effective heat dissipation.