AP7315D-33FS4-7B

Overview

The AP7315D-33FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 3.3V with a maximum guaranteed output 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 discharge resistor for rapid output voltage decay upon shutdown. Packaged in an X2-DFN1010-4 footprint, it supports surface-mount assembly and functions reliably across an operating ambient temperature range of -40°C to +85°C.

Feature Summary

• Integrated auto-discharge circuitry ensures rapid output voltage decay when the enable pin is deactivated.
• High power supply ripple rejection capability effectively suppresses input noise at standard frequencies.
• Low output noise characteristic minimizes interference in sensitive analog and RF signal paths.
• Compact X2-DFN1010-4 package design facilitates dense printed circuit board layouts.

Applications

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

Procurement Notes

Verify that the specific part number suffix FS4 corresponds to the X2-DFN1010-4 package type required for your PCB layout. Confirm the 'D' designation indicates the inclusion of the internal output discharge feature, as this affects shutdown behavior compared to non-discharge variants. Ensure compatibility with RoHS compliance standards and check for any specific automotive qualification requirements if deploying in regulated environments.

Selection Notes

Select this component when a compact form factor is prioritized alongside precise 3.3V regulation. The built-in discharge function makes it suitable for systems requiring fast power-down sequences. Evaluate thermal dissipation capabilities based on the small package size and expected load currents. Consider the low quiescent current for battery-operated applications where standby power consumption is critical.

Part Context

This device belongs to the AP7315 family of CMOS low dropout regulators produced by Diodes Incorporated. The series offers various fixed output voltages ranging from 1.1V to 3.3V. Different package options include SOT23, SOT25, and the X2-DFN1010-4. The 'D' variant specifically adds an output discharge feature, distinguishing it from the standard AP7315 models which lack this functionality.

Replacement Considerations

AP7315-33FS4-7B (Non-discharge version)

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 resistor. This feature actively pulls the output voltage down to ground when the enable pin is set low, ensuring faster shutdown times compared to non-discharge versions.

How does the enable pin control the device operation?

The enable pin turns the regulator on when driven high and puts it into shutdown mode when pulled low. If the enable feature is not utilized, the pin should be tied to the VIN pin to keep the regulator permanently active.