AP7315-32FS4-7B

Overview

The AP7315-32FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a precise 3.2V output voltage. It operates within an input voltage range of 1.7V to 5.25V and supports a guaranteed continuous output current of 150mA. The device features high power supply rejection ratio (PSRR) of 75dB at 1kHz and low output noise of 60µVrms from 10Hz to 100kHz. Quiescent current is as low as 35µA. It includes an enable pin for power control and short-circuit protection. The component is housed in an X2-DFN1010-4 package.

Feature Summary

• Integrated resistor network provides fixed output voltage with ±1% accuracy
• CMOS process enables low quiescent current and low on-resistance
• Includes enable input for controlled power-on and shutdown modes
• Built-in current limit circuit protects against short circuits

Applications

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

Procurement Notes

Verify the exact part number suffix FS4-7B to confirm the X2-DFN1010-4 package and tape-and-reel packaging quantity. Ensure the ordering code matches the required 3.2V fixed output specification. Confirm RoHS compliance and halogen-free status if environmental regulations apply to your manufacturing process. Cross-reference the manufacturer's latest datasheet revision for any updates to electrical characteristics or marking information before finalizing procurement.

Selection Notes

Select this component when a stable 3.2V rail is required for sensitive RF or audio subsystems due to its low noise profile. The wide input voltage range accommodates single-cell lithium-ion battery applications. Consider the X2-DFN1010-4 package for dense PCB layouts where minimal footprint is critical. Verify that the load current does not exceed the 150mA guarantee and that thermal dissipation requirements are met within the operating temperature range.

Part Context

This part belongs to the AP7315 series of low dropout regulators designed for low-power handheld communication equipment. The series offers various fixed output voltages ranging from 1.1V to 3.3V. The 'D' suffix variant includes an auto-discharge feature, whereas the standard AP7315 does not. The FS4 suffix specifically denotes the compact X2-DFN1010-4 surface-mount package, distinguishing it from SOT23 or SOT25 options.

Replacement Considerations

Direct replacements must match the 3.2V output, 150mA current capability, and X2-DFN1010-4 package. Variants like AP7315D-32FS4-7B offer identical electrical performance but include an output discharge function. Other packages such as SOT23 or SOT25 require schematic and layout modifications.