AP7315-185FS4-7B

Overview

The AP7315-185FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.85V. It operates within an input voltage range of 1.7V to 5.25V and supports a guaranteed output current of 150mA. The device utilizes a CMOS process and features high ripple rejection of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. Quiescent current is specified as low as 35µA. It is housed in an X2-DFN1010-4 package with an integrated resistor network for fixed voltage delivery.

Feature Summary

• Includes an enable pin to control power states and internal discharge circuitry for rapid shutdown
• Features built-in short-circuit protection that clamps output current during fault conditions
• Delivers high output voltage accuracy with minimal line and load regulation variations
• Designed for dense PCB layouts using a compact surface-mount footprint

Applications

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

Procurement Notes

Verify the specific ordering suffix FS4-7B corresponds to the required X2-DFN1010-4 package and tape-and-reel quantity. Confirm the presence of the 'D' designation if active output discharge functionality is required for the application design. Ensure compliance with RoHS and halogen-free specifications matches project environmental standards before finalizing procurement orders.

Selection Notes

Select this component when a stable 1.85V rail is needed for sensitive RF or logic circuits requiring low noise performance. The wide input voltage range accommodates single-cell battery applications. Verify that the thermal dissipation capabilities of the X2-DFN1010-4 package align with the expected ambient temperature and load current conditions of the target system design.

Part Context

This part belongs to the AP7315 series of low dropout regulators designed for handheld communication equipment. The series offers various fixed output voltages ranging from 1.1V to 3.3V. The AP7315-185FS4-7B specifically provides the 1.85V variant in the smallest available package option, optimizing space-constrained portable electronic designs.

Replacement Considerations

AP7315-185SA-7 (SOT23 Package)

FAQ

What is the function of the EN pin on the AP7315-185FS4-7B?

The EN pin enables or disables the regulator. Driving it high turns the regulator on, while pulling it low activates shutdown mode. If unused, it should be tied to VIN.

Does the AP7315-185FS4-7B include output discharge?

Yes, the 'D' in the base model name indicates the inclusion of an auto-discharge feature that rapidly pulls down the output voltage when the device is disabled.