R1224N122F-TR-FE

Overview

The R1224N122F-TR-FE is a non-isolated step-down DC/DC 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 1.2 V. The device supports both PWM and VFM control modes with a switching frequency of 500 kHz and achieves a maximum duty cycle of 100%. It functions in an ambient temperature range from -40°C to +85°C, consumes 20 µA of operating supply current, and is housed in an SOT-23-5 surface-mount package.

Feature Summary

• Supports continuous conduction mode via 100% maximum duty cycle capability for low dropout operation.
• Integrates dual control modes allowing automatic transition between Pulse Width Modulation (PWM) and Voltage Frequency Modulation (VFM) for optimized efficiency across load ranges.
• Features ultra-low quiescent current consumption to maintain high efficiency during light-load conditions.

Applications

• Battery-powered portable electronic devices requiring efficient power management.
• Embedded systems utilizing buck topology for core voltage regulation.
• General-purpose step-down conversion in consumer electronics.

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's official datasheet to confirm the fixed 1.2 V output voltage setting. Ensure the ordering quantity aligns with the standard factory reel packaging requirements specified in the product documentation. Confirm RoHS compliance status through the provided environmental files before finalizing procurement specifications.

Selection Notes

Select this component when a fixed 1.2 V output is required from an input source ranging up to 18.5 V. The integrated VFM/PWM hybrid control makes it suitable for applications demanding high efficiency at both heavy and light loads. The SOT-23-5 package is appropriate for space-constrained designs where thermal performance and footprint are critical factors.

Part Context

This part belongs to the R1224N series of switching controllers designed for step-down applications. It serves as a dedicated controller IC rather than a complete power stage, requiring external MOSFETs and passive components. The series is characterized by its wide input voltage range and compact form factor, targeting modern portable and industrial power management needs.

Replacement Considerations

Cross-reference with other members of the R1224N family, such as variants with different output voltages or control modes, if system requirements change. Verify pin compatibility and thermal characteristics when substituting with similar buck controllers from other manufacturers to ensure design integrity.