RN5RF31AA-TR-FE

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

The RN5RF31AA-TR-FE is a CMOS-based low ripple voltage regulator IC from the RN5RF series, designed to control external driver transistors. It features high accuracy output voltage of 3.1V with ±2% tolerance and ultra-low dropout characteristics. The device operates within an input voltage range up to 12.0V and supports an operating temperature range of -40°C to +85°C. Key electrical parameters include a typical supply current of 30μA and standby supply current of 0.1μA. It provides a typical ripple rejection of 60dB at 1kHz and includes internal short circuit current limiting.

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

• CMOS process technology enables ultra-low supply current consumption for battery-powered applications.
• Integrated chip enable function allows power conservation during standby modes.
• High ripple rejection capability suitable for portable communication equipment.
• Internal short circuit current limiting protects the external transistor.

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

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

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

Verify the specific output voltage designation matches the required 3.1V application. Confirm the CE pin polarity corresponds to the 'A' suffix indicating active low logic level. Ensure the external PNP transistor selected meets the recommended hFE range of 100 to 300 for proper current limiting operation. Check package compatibility with the SOT-23-5 footprint.

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

Select this component when designing regulators requiring ultra-low dropout voltage and high ripple rejection. The external transistor selection significantly impacts output current capabilities; choose a low saturation type PNP transistor. Consider the standby current requirement if battery life is critical, as the chip enable feature can reduce current to 0.1μA. Verify input voltage does not exceed the absolute maximum rating of 12.0V.

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

This part belongs to the RN5RF series of low ripple voltage regulators with external transistors. The series offers configurable output voltages from 1.2V to 6.0V in 0.1V steps. The 'AA' suffix denotes a fixed 3.1V output with active low Chip Enable. The 'TR-FE' indicates tape and reel packaging in quantities of 3,000 pieces per reel, compliant with RoHS and halogen-free standards.

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

RN5RF31BA-TR-FE (Active High CE)

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

What is the role of the EXT pin?

The EXT pin serves as the drive output for the external PNP transistor, controlling the regulator's output current based on the internal error amplifier feedback.

How is the output voltage determined?

The output voltage is internally set by the manufacturer according to the part number suffix (e.g., 31 for 3.1V) and is not adjustable by external resistors.