FAN1951D25X

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

The FAN1951D25X is a fixed-output low-dropout linear regulator providing a 2.5V output with a minimum guaranteed current of 1.5A. It utilizes a PNP pass element to achieve a maximum dropout voltage of 500mV at full load. The device incorporates overcurrent limiting and thermal shutdown for protection. Key features include an external logic-level enable pin and an open-collector error flag output indicating undervoltage or over-current conditions.

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

• Includes an external enable pin for logic-controlled power management
• Features an active-low error flag output for fault monitoring
• Provides integrated overcurrent limiting and thermal shutdown protection

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

• Low-voltage CPU, DSP, and FPGA power conversion
• Post-regulation for switch-mode power supplies
• Cable and satellite set-top boxes
• PCI graphics adapter cards

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

Verify the specific suffix 'X' indicates tape and reel packaging as documented in the ordering information. Confirm that the 2.5V fixed output version matches the required system voltage. Ensure the TO-252 DPAK package footprint aligns with the target PCB layout. Check for any RoHS compliance status updates from the manufacturer.

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

Select this component when a 1.5A output current is required with a 2.5V fixed rail. The inclusion of an enable pin and error flag distinguishes it from the FAN1950 variant. Verify input voltage ranges between 2.25V and 14V suit the application. Consider the 500mV dropout characteristic for efficiency calculations under heavy loads.

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

This part belongs to the FAN1950/FAN1951 family of 1.5A low-dropout regulators manufactured by onsemi (formerly Fairchild Semiconductor). The series uses a PNP output pass element to minimize voltage drop. The FAN1951D25X specifically denotes the 2.5V output version packaged in a 5-lead TO-252 DPAK configuration.

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

The FAN1950D25X serves as a direct substitute if the enable pin and error flag outputs are not utilized in the design. Both devices share identical electrical characteristics regarding current, dropout, and protection features.