RN5RF30AA-TR-FE

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The RN5RF30AA-TR-FE is a CMOS-based low ripple voltage regulator IC from the RN5RF series, manufactured by Nisshinbo Micro Devices. It controls an external driver transistor to achieve ultra-low dropout voltage and output currents in the range of several tens to hundreds of mA. The device integrates a voltage reference unit, error amplifier, output voltage setting resistor, short circuit current limiting circuit, and chip enable circuit. Key electrical parameters include a typical supply current of 30μA, standby supply current of 0.1μA, output voltage accuracy of ±2%, and ripple rejection of typically 60dB at 1kHz. The output voltage is fixed at 3.0V with a temperature-drift coefficient of typically ±100ppm/°C. It operates within an input voltage range up to 12.0V and supports an operating temperature range of -40°C to +85°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrates a voltage reference unit, error amplifier, and short circuit current limiting circuit for stable regulation.
• Features a chip enable function designed to conserve battery life during standby modes.
• Provides high ripple rejection and transient response suitable for portable communication equipment.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Power source for battery-powered equipment
• Power source for hand-held communication equipment, cameras, and VCRs
• Power source for home appliances

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific part marking against the official datasheet to confirm the 3.0V output voltage designation. Ensure the external PNP transistor selected meets the recommended hFE range of 100 to 300 for proper operation. Confirm that the ordering suffix corresponds to the required Chip Enable pin polarity, as options exist for both active-high and active-low configurations.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when designing regulators requiring ultra-low dropout voltage and high accuracy. Consider the need for an external PNP transistor with low saturation characteristics to handle the desired output current. Evaluate the system's standby power requirements to utilize the chip enable feature effectively. Ensure the external components, particularly capacitors, meet the stability criteria specified in the application notes.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This component belongs to the RN5RF series of low ripple voltage regulators with external transistors. The series utilizes a CMOS process to achieve low supply current while maintaining high performance metrics such as ripple rejection and line regulation. The SOT-23-5 package allows for compact design integration in portable devices.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes are not explicitly listed in the provided documentation. When selecting alternatives, ensure compatibility with the SOT-23-5 package and verify that the replacement IC supports control of an external driver transistor with similar electrical characteristics.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the role of the EXT pin on the RN5RF30AA-TR-FE?

The EXT pin serves as the external transistor drive pin, providing a CMOS output signal to control the base of the external PNP driver transistor.

How does the Chip Enable (CE) pin function affect the device?

The CE pin allows the user to switch the regulator between active operation and standby mode. In standby mode, the supply current drops to approximately 0.1μA, which helps extend battery life in portable applications.