R1223N252A-TR-FE

Overview

The R1223N252A-TR-FE is a PWM/VFM step-down DC/DC controller manufactured by Nisshinbo Micro Devices. It operates with an input voltage range of 2.3 V to 13.2 V and delivers a fixed output voltage of 2.5 V. The device supports a switching frequency of 300 kHz with 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 140 µA. Packaged in a compact SOT-23-5 surface-mount format, this non-isolated buck converter controller is designed for efficient power management in space-constrained applications.

Feature Summary

• Supports both PWM and VFM operation modes for optimized efficiency across varying load conditions
• Enables full load capability through a 100% maximum duty cycle design
• Integrates low quiescent current consumption to extend battery life in portable devices

Applications

• Battery-powered portable electronic devices
• General-purpose step-down power supplies
• White LED driver circuits requiring stable bias voltages

Procurement Notes

Verify the specific suffix 'H' or 'A' against your target output voltage requirement, as these denote different fixed voltage options within the R1223N series. Confirm that the SOT-23-5 package aligns with your PCB footprint constraints. Ensure the input voltage range up to 13.2 V matches your system's power source specifications before finalizing the component selection.

Selection Notes

Select this controller when a fixed 2.5 V output is required from a wide input range. Consider the 300 kHz switching frequency for balancing component size and transient response. Evaluate the need for external MOSFETs, as this is a controller rather than an integrated switch. Compare against other R1223N variants if different output voltages or switching frequencies better suit the application's efficiency targets.

Part Context

This component belongs to the R1223N series of switching controllers from Nisshinbo Micro Devices. The series includes various fixed-output voltage options, such as the R1223N182H for 1.8 V and R1223N332A for 3.3 V outputs. All members share similar topologies and packaging, differing primarily in their internal feedback resistor networks to set the specific output voltage levels.

Replacement Considerations

Direct substitutes include R1223N182H-TR-FE (1.8 V) and R1223N332A-TR-FE (3.3 V) if voltage tolerance allows. Verify pin compatibility and thermal performance when swapping between these family members.