AP7315D-25FS4-7B

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

The AP7315D-25FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a precise 2.5V output with a guaranteed maximum load current of 150mA. It operates within an input voltage range of 1.7V to 5.25V and features a typical quiescent current of 35µA. The device incorporates an integrated auto-discharge circuit for rapid output voltage decay upon shutdown. Packaged in the compact X2-DFN1010-4 footprint, it delivers high ripple rejection of 75dB at 1kHz and maintains low output noise of 60µVrms across the 10Hz to 100kHz bandwidth.

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

• Integrated resistor network provides a fixed 2.5V output with ±1% accuracy
• Built-in discharge feature rapidly reduces output voltage when disabled
• CMOS process architecture ensures low power consumption and minimal quiescent current
• High ripple rejection capability effectively suppresses input supply noise

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

• Smart Phone/PAD
• RF Supply
• Cameras
• Portable Videos
• Wireless Communication

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

Verify that the FS4 suffix corresponds to the X2-DFN1010-4 package type required for your PCB layout. Confirm the 'D' designation indicates the presence of the internal auto-discharge function, as this affects shutdown behavior compared to non-discharge variants. Ensure the ordering code matches the specific 2.5V output requirement and tape-and-reel packaging specifications.

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

Select this component when a stable 2.5V rail is needed for sensitive analog or RF circuits requiring low noise. The inclusion of the auto-discharge feature makes it suitable for battery-powered systems where minimizing standby leakage is critical. Verify that the input voltage remains above the minimum threshold while accounting for the dropout voltage under full load conditions.

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

This part belongs to the AP7315 series of low dropout regulators designed for portable electronics. The series offers various fixed output voltages ranging from 1.1V to 3.3V. The 'D' variant specifically includes an output discharge resistor, distinguishing it from standard versions. It is engineered for dense PCB layouts using small surface-mount packages.

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

AP7315-25FS4-7B (Non-discharge version)

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

What is the function of the 'D' suffix in the part number?

The 'D' suffix indicates that the regulator includes an integrated auto-discharge circuit, which actively pulls the output voltage down when the enable pin is low.

How does the AP7315D-25FS4-7B handle short-circuit conditions?

It features fold-back short-circuit protection that clamps the output current to approximately 55mA when the output is shorted to ground, protecting the device from overheating.