R1224N502L-TR-FE

Overview

The R1224N502L-TR-FE is a CMOS-based PWM step-down DC/DC converter controller manufactured by Nisshinbo Micro Devices. It operates within an input voltage range of 2.3 V to 18.5 V and delivers a fixed output voltage of 5 V. The device supports a maximum output current of 50 mA with a switching frequency of 180 kHz. It features a duty cycle up to 100% and consumes only 20 uA of supply current. The component is designed for non-isolated applications, operating reliably between -40°C and +85°C in a compact SOT-23-5 package.

Feature Summary

• Integrates a low-supply-current CMOS oscillator for efficient power management
• Supports continuous conduction mode with up to 100% duty cycle capability
• Provides stable regulation for fixed-voltage buck converter topologies

Applications

• Battery-powered portable electronic devices
• General-purpose step-down DC/DC conversion circuits
• Low-power embedded system power supplies

Procurement Notes

Verify the specific suffix 'L' against the manufacturer's official datasheet to confirm pinout compatibility and thermal characteristics. Ensure that the required output voltage matches the fixed 5 V specification inherent to this part number variant. Confirm that the external inductor and capacitor selections align with the 180 kHz switching frequency requirements defined in the technical documentation.

Selection Notes

Select this component when a fixed 5 V output is required from a wide input voltage range without the need for external feedback adjustment. The low quiescent current makes it suitable for battery-operated systems where standby power consumption is critical. Consider the 50 mA output limit and ensure the load requirements do not exceed the controller's specified current capacity.

Part Context

This part belongs to the R1224N series of switching controllers, which are characterized by their CMOS technology and low power consumption. The series offers various fixed output voltage options, differentiated by alphanumeric suffixes. The R1224N502L-TR-FE specifically denotes the 5 V output variant packaged in SOT-23-5 format.

Replacement Considerations

Cross-reference with other R1224N variants such as R1224N502H or R1224N502E if different packaging or temperature grades are needed, provided the electrical specifications remain compatible.