R1224N312M-TR-FE

Overview

The R1224N312M-TR-FE is a Buck DC/DC controller from the Nisshinbo R1224N series, designed for step-down voltage conversion. It operates with an input voltage range of 2.3 V to 18.5 V and provides a fixed output voltage of 3.1 V. The device supports a switching frequency of 180 kHz and achieves a maximum duty cycle of 100%. It functions within a temperature range of -40°C to +85°C and consumes a typical operating supply current of 20 µA. Packaged in a compact SOT-23-5 surface-mount format, it utilizes PWM control for efficient power management.

Feature Summary

• Supports 100% duty cycle operation for low dropout performance
• Integrates PWM control for stable step-down conversion
• Features ultra-low quiescent current for energy efficiency

Applications

• Battery-powered portable electronics
• Embedded systems requiring regulated 3.1 V rails
• Industrial control modules

Procurement Notes

Verify the specific suffix 'M' indicates the fixed 3.1 V output variant when sourcing. Confirm the manufacturer is Nisshinbo Micro Devices Inc., as legacy Ricoh branding may appear in older documentation. Ensure the SOT-23-5 package matches your PCB footprint requirements before finalizing procurement orders.

Selection Notes

Select this component when a fixed 3.1 V output is required from a wide input range up to 18.5 V. It is suitable for applications prioritizing low standby current and compact size. Consider external MOSFETs if higher load currents exceed the internal switch capabilities or thermal limits defined in the datasheet.

Part Context

This part belongs to the R1224N family of non-isolated buck controllers. It shares architectural similarities with variants like R1224N102M and R1224N152M, differing primarily in the fixed output voltage setting. The series is characterized by high efficiency and small form factor integration for modern PMIC applications.

Replacement Considerations

Direct substitutes include R1224N102M-TR-FE (1.0 V output) and R1224N152M-TR-FE (1.5 V output) if voltage levels can be adjusted via external feedback networks. Other R1224N series members with identical packages and pinouts may serve as functional replacements depending on specific voltage requirements.