R1224N502E-TR-FE

Overview

The R1224N502E-TR-FE is a non-isolated Buck switching controller from the Nisshinbo R1224N series. It operates with an input voltage range of 2.3 V to 18.5 V and provides a fixed 5 V output. The device supports a maximum output current of 50 mA and features a switch frequency of 500 kHz. Quiescent current is specified at 40 uA. It offers 100% maximum duty cycle capability and functions within a temperature range of -40°C to +85°C. The component is housed in an SOT-23-5 package.

Feature Summary

• Supports PWM and VFM step-down DC/DC conversion modes for efficient power management.
• Features a wide input voltage operating range suitable for various supply conditions.
• Provides a fixed 5 V output with integrated control logic for external switching elements.

Applications

• Battery-powered portable electronic devices
• General-purpose low-power embedded systems
• Consumer electronics requiring stable 5V logic supplies

Procurement Notes

Verify the specific suffix 'E' against official Nisshinbo documentation to confirm exact electrical tolerances and pinout configurations, as suffixes often denote critical variations. Ensure compatibility with external MOSFETs or inductors based on the 500 kHz switching frequency and 50 mA current limits. Cross-reference the SOT-23-5 thermal requirements with your PCB layout specifications to maintain operation within the -40°C to +85°C range.

Selection Notes

Select this component when a fixed 5 V output is required from a variable input source between 2.3 V and 18.5 V. It is suitable for applications prioritizing low quiescent current (40 uA) and compact SOT-23-5 packaging. Consider the 500 kHz frequency for balancing component size and efficiency. Verify that the external circuit can handle the 50 mA load current without exceeding thermal constraints.

Part Context

This part belongs to the R1224N series of PWM/VFM step-down DC/DC controllers by Nisshinbo Micro Devices. The series focuses on low-power applications with fixed output voltages. The R1224N502E variant specifically targets 5 V regulation. It shares the same SOT-23-5 footprint and general control architecture with other members like the R1224N182E (1.8 V) and R1224N252E (2.5 V), differing primarily in the internal feedback resistor network setting the output voltage.

Replacement Considerations

Direct functional substitutes within the same family include R1224N502H-TR-FE, which shares the 5 V output and similar topology but may differ in specific electrical characteristics or suffix designations. Always verify datasheet parameters for current and voltage ratings before substitution.