FAN1581M12X

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The FAN1581M12X is a synchronous buck controller manufactured by onsemi. It operates with an input voltage range of 4.75 V to 23 V and provides a fixed output voltage of 1.2 V. The device supports up to 60 A of output current using external MOSFETs. Key electrical parameters include a switching frequency adjustable from 100 kHz to 500 kHz, a typical efficiency of 96%, and a load regulation of 0.4%. It features a soft-start time of 2 ms and operates within a temperature range of -40°C to +125°C.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated synchronous buck control architecture for high-efficiency power conversion
• Fixed 1.2 V output voltage configuration for standard logic supply rails
• Wide input voltage capability supporting various bus architectures
• Adjustable switching frequency to optimize component size and performance

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Point-of-load (POL) converters in telecommunications infrastructure
• Power supplies for network switches and routers
• Voltage regulation for industrial equipment
• Server and storage system power distribution

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix 'M12X' against the official onsemi datasheet to confirm the fixed 1.2 V output voltage variant. Ensure the package type matches the required PCB layout, typically DFN or similar surface-mount options. Confirm RoHS compliance status and check for any recent part number updates due to Fairchild Semiconductor integration changes. Validate that the supplier provides genuine components with traceable origin.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 1.2 V output is required without external feedback resistors. Consider the 60 A current capability and wide input range for robust design margins. Evaluate the thermal performance requirements based on the expected load current and ambient conditions. Compare the adjustable frequency range against EMI constraints and passive component selection needs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The FAN1581 series belongs to onsemi's portfolio of synchronous buck controllers designed for high-current applications. These devices are engineered to replace traditional PWM controllers with integrated gate drivers for improved efficiency. The FAN1581M12X specifically targets applications requiring stable low-voltage, high-current power delivery with minimal external component count.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Check for updated part numbers under the onsemi naming convention if replacing legacy Fairchild parts. Verify compatibility with existing PCB footprints and control loop compensation networks. Ensure that alternative devices support the same 1.2 V fixed output and current rating.