AP7315D-31FS4-7B

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

The AP7315D-31FS4-7B is a low dropout regulator manufactured by Diodes Incorporated, featuring an integrated resistor network for a fixed 3.1V output voltage. It operates within a wide input voltage range of 1.7V to 5.25V and guarantees an output current of 150mA. The device incorporates an enable pin for power control and includes auto-discharge functionality to rapidly reduce the output voltage when disabled. Packaged in an X2-DFN1010-4 format, it supports dense PCB layouts.

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

• Integrated resistor network provides precise fixed output voltage accuracy
• Built-in auto-discharge circuit ensures rapid output voltage reduction upon shutdown
• Low quiescent current consumption optimizes battery life in portable devices
• High ripple rejection capability maintains stable performance under noisy conditions

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 the specific ordering suffix FS4-7B confirms the X2-DFN1010-4 package and tape-and-reel packaging quantity. Ensure the D suffix is required for the auto-discharge feature, as non-discharge variants exist within the same series. Confirm RoHS compliance and lead-free status align with project requirements before finalizing procurement orders.

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

Select this component when a fixed 3.1V rail is needed with minimal footprint constraints. The X2-DFN1010-4 package offers thermal advantages over standard SOT packages. Verify that the 150mA load requirement does not exceed the absolute maximum ratings. Consider the enable pin logic levels if interfacing with low-voltage microcontrollers or digital signals.

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

This part belongs to the AP7315 family of CMOS low dropout regulators designed for handheld communication equipment. The 'D' designation specifically indicates the inclusion of an internal discharge resistor connected to the output, distinguishing it from the standard AP7315 which lacks this feature. The FS4 code identifies the compact surface-mount package type used for space-sensitive designs.

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

AP7315-31FS4-7B serves as a direct substitute if the auto-discharge function is unnecessary. Other AP7315 variants with different output voltages share identical pinouts but require schematic adjustments. Cross-reference datasheets to ensure equivalent PSRR and noise specifications match the application needs.