R1224N402G-TR-FE

Overview

The R1224N402G-TR-FE is a non-isolated buck DC/DC controller manufactured by Nisshinbo Micro Devices. It operates within an input voltage range of 2.3 V to 18.5 V and supports adjustable output voltages from 1 V to 18.5 V. The device features a switching frequency of 300 kHz and delivers a maximum duty cycle of 100%. It functions in PWM or VFM modes and draws a typical operating supply current of 20 uA. The component is housed in a compact SOT-23-5 package and is rated for operation between -40°C and +85°C.

Feature Summary

• Supports both Pulse Width Modulation (PWM) and Variable Frequency Mode (VFM) operation for optimized efficiency across varying load conditions.
• Enables high efficiency at light loads through automatic transition between control modes based on system demand.
• Provides stable step-down conversion with a wide input voltage range suitable for diverse power sources.

Applications

• Portable electronic devices requiring efficient battery-powered step-down regulation
• Embedded systems utilizing single-cell lithium-ion or lithium-polymer batteries
• Industrial control modules needing reliable low-power DC/DC conversion

Procurement Notes

Verify the specific suffix 'G' against official datasheets to confirm the exact switching frequency and internal resistor values, as these parameters define the operational characteristics. Ensure compatibility with external components such as inductors and capacitors for the intended 300 kHz frequency. Confirm RoHS compliance status and packaging requirements directly with the manufacturer or authorized distributors before finalizing orders.

Selection Notes

Select this controller when a fixed 300 kHz switching frequency is required for EMI management and component size optimization. It is appropriate for designs needing a wide input voltage range up to 18.5 V without requiring a shutdown pin. Consider the SOT-23-5 package constraints for thermal management and PCB layout space. Evaluate the need for PWM/VFM auto-transition if light-load efficiency is a critical design parameter.

Part Context

This component belongs to the R1224N series of switching controllers from Nisshinbo Micro Devices. The series offers various output voltage configurations and switching frequencies tailored for different power management applications. The R1224N402G variant specifically targets applications requiring a 300 kHz frequency, distinguishing it from other models in the family that may operate at 180 kHz or other rates.

Replacement Considerations

R1224N402H-TR-FE

FAQ

Does the R1224N402G-TR-FE include a shutdown function?

No, this specific model does not feature a shutdown pin; it lacks an active low-power standby mode controlled by an external signal.

What is the maximum duty cycle supported by this controller?

The device supports a maximum duty cycle of 100%, allowing for minimal dropout voltage during operation.