RN5RF51AA-TR-FE

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

The RN5RF51AA-TR-FE is a CMOS-based low dropout voltage regulator IC from the RN5RF series, designed to control an external PNP driver transistor. It provides a fixed output voltage of 5.1V with ±2% accuracy and operates within a maximum input voltage range of 10V. The device features a typical supply current of 30μA and standby current of 0.1μA. Key electrical characteristics include a ripple rejection of 60dB at 1kHz and a line regulation of 0.05%/V. It incorporates short circuit current limiting and a chip enable function for power conservation.

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

• CMOS architecture enables ultra-low supply current and standby consumption for battery-powered applications
• Integrated error amplifier and voltage reference unit ensure high output voltage accuracy
• Chip enable pin allows active shutdown to conserve energy during standby modes
• Built-in short circuit current limiting protects both the IC and external components

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

• Power source for battery-operated portable equipment
• Voltage regulation for hand-held communication devices such as cell phones and PDAs
• Power management in home appliances requiring stable low-voltage rails

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

Verify that the specific ordering suffix matches the required CE pin polarity configuration. The 'A' designation indicates Low-active Chip Enable functionality. Confirm package type is SOT-23-5 and reel quantity aligns with manufacturing requirements. Ensure external PNP transistors selected meet the specified hFE range for proper operation.

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

Select this component when a fixed 5.1V output is required with minimal quiescent current draw. The design necessitates an external low-saturation PNP transistor with an hFE between 100 and 300 to achieve optimal performance. Consider the thermal dissipation limits of the SOT-23-5 package under maximum load conditions and input voltage differentials.

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

This part belongs to the RN5RF series of low ripple voltage regulators manufactured by Nisshinbo Micro Devices. The series utilizes CMOS technology to provide high ripple rejection and transient response suitable for sensitive portable electronics. The RN5RF51AA variant specifically fixes the output voltage at 5.1V with Low-active Chip Enable logic.

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

Direct substitutes within the same family include RN5RF50AA-TR-FE (5.0V) or RN5RF52AA-TR-FE (5.2V), provided the output voltage tolerance meets system requirements. Verify that any replacement maintains the same SOT-23-5 footprint and compatible external transistor drive characteristics.