AP7315D-135W5-7

Overview

The AP7315D-135W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a 1.35V output with a guaranteed maximum load current of 150mA. The device operates within an input voltage range of 1.7V to 5.25V and features a typical ripple rejection ratio of 75dB at 1kHz. Quiescent current is specified as low as 35µA, while the output noise voltage is 60µVrms across a 10Hz to 100kHz bandwidth. The component utilizes an SOT25 package and includes an integrated enable pin for power control.

Feature Summary

• Integrated auto-discharge circuitry that actively pulls the output voltage to ground when the enable pin is deactivated.
• High power supply ripple rejection capability designed to minimize noise interference in sensitive signal paths.
• Low output noise performance suitable for powering RF circuits and precision analog components.

Applications

• RF power supply lines
• Portable video equipment
• Wireless communication adapters

Procurement Notes

Verify the specific suffix 'D' indicates the inclusion of the internal discharge resistor network, which distinguishes this variant from standard non-discharge versions. Confirm the 'W5' designation corresponds to the SOT25 surface-mount package required for your PCB footprint. Ensure the ordering code matches the exact 1.35V fixed output specification before finalizing procurement orders.

Selection Notes

Select this component when a compact solution with active output discharge is required for portable electronics. The SOT25 package offers a balance between thermal dissipation and board space efficiency compared to smaller alternatives. Verify that the 150mA continuous current rating meets the peak load demands of the target application circuit design.

Part Context

This part belongs to the AP7315 series of CMOS low dropout regulators. The series is engineered for handheld devices requiring high accuracy and low quiescent current. The 'D' suffix specifically denotes the version equipped with an internal N-channel auto-discharge feature, ensuring the output safely discharges when the regulator is disabled.

Replacement Considerations

AP7315-135W5-7 (Non-discharge variant)

FAQ

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

The 'D' suffix indicates that the regulator includes an internal auto-discharge circuit. This feature actively pulls the output voltage to ground when the enable pin is set to a low state.

How does the enable pin operate on this device?

The enable pin controls the regulator's operation. Driving the pin high turns the regulator on, while pulling it low activates the shutdown mode and engages the internal discharge circuit.