R1224N502F-TR-FE

Overview

The R1224N502F-TR-FE is a non-isolated Buck DC/DC controller manufactured by Nisshinbo Micro Devices. It operates with a fixed switching frequency of 500 kHz and supports an input voltage range from 2.3 V to 18.5 V. The device provides one adjustable output, capable of delivering voltages between 1 V and 18.5 V. It features a maximum duty cycle of 100% and functions within a temperature range of -40°C to +85°C. Packaged in an SOT-23-5 surface-mount case, it utilizes PWM control for step-down conversion.

Feature Summary

• Supports high-frequency operation at 500 kHz for compact external component sizing
• Enables continuous conduction mode with 100% maximum duty cycle capability
• Accepts wide input voltage ranges suitable for various power supply architectures

Applications

• Portable electronic devices requiring efficient step-down regulation
• Battery-powered systems needing stable low-voltage outputs
• General-purpose embedded power management circuits

Procurement Notes

Verify the specific suffix F against official datasheets to confirm the 500 kHz switching frequency variant, as other suffixes may indicate different frequencies or packages. Ensure the ordering documentation explicitly references the R1224N502F model number to avoid confusion with similar series parts like the R1224N102M. Cross-reference the manufacturer part number with authorized distributor catalogs to confirm current availability and lead times prior to finalizing procurement plans.

Selection Notes

Select this component when a higher switching frequency than standard 180 kHz variants is required to minimize passive component size. The 500 kHz operation allows for smaller inductors and capacitors compared to lower frequency controllers. Ensure the application design accommodates the thermal characteristics associated with this switching speed and verify that the input voltage requirements fall within the specified 2.3 V to 18.5 V operational window.

Part Context

This part belongs to the R1224N series of switching controllers from Nisshinbo Micro Devices. The series includes various models differentiated primarily by their switching frequencies and package options. While the R1224N102M operates at 180 kHz, the R1224N502F variant specifically targets applications benefiting from faster transient response and reduced passive component footprint due to its 500 kHz operating point.

Replacement Considerations

Direct substitutes include other R1224N series controllers with identical pinouts but different frequencies, such as the R1224N102M-TR-FE (180 kHz). Verify that the system design can tolerate the change in switching frequency if replacing with a lower frequency variant.