AP7343-185FS4-7B

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

The AP7343-185FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.85V with a guaranteed maximum output current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz and low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for shutdown control, thermal shutdown protection, and short-circuit current limiting. It is housed in an X2-DFN1010-4 (Type B) package.

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

• Integrated enable pin allows for precise on/off control and low-power shutdown mode
• High ripple rejection and low output noise ensure clean power delivery for sensitive circuits
• Built-in thermal shutdown and fold-back short-circuit protection safeguard against overcurrent and overheating

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

• Smart phones and tablets
• RF supplies
• Cameras
• Portable videos
• Wireless communication devices

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

Verify the specific ordering suffix FS4-7B corresponds to the X2-DFN1010-4 (Type B) package and tape-and-reel quantity when sourcing. Confirm RoHS compliance and halogen-free status requirements align with project specifications. Ensure the 1.85V fixed output matches the target circuit design before procurement.

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

Select this component for applications requiring a compact footprint and stable 1.85V rail. The X2-DFN1010-4 package supports dense PCB layouts. Verify that the input voltage remains above the minimum threshold and that load transients are within the 300mA capability. Consider the non-discharge feature if rapid output discharge is not required.

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

This part belongs to the AP7343 series of 300mA high PSRR low-noise LDOs. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' suffix variants include an auto-discharge feature, whereas the base AP7343 model does not. The FS4 designation indicates the X2-DFN1010-4 package type.

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

AP7343-185W5-7B serves as a package alternative in SOT25-5. For automotive applications, verify compatibility with the AP7343Q series under separate datasheet DS37952.