AP7343-09FS4-7B

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

The AP7343-09FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 0.9V output at up to 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 with low output noise of 60µVrms from 10Hz to 100kHz. The device utilizes X2-DFN1010-4 (Type B) packaging, ensuring minimal footprint for dense PCB layouts. It includes integrated current limit and thermal shutdown protection, maintaining operation across temperatures from -40°C to +85°C.

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

• Integrated enable pin allows precise control over regulator activation and shutdown states
• High ripple rejection capability ensures clean power delivery in noisy environments
• Low quiescent current design optimizes efficiency for battery-powered applications
• Built-in short-circuit and thermal protection safeguards against overload conditions

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 required X2-DFN1010-4 package and tape-and-reel quantity. Confirm that the non-discharge variant meets system requirements, as discharge versions exist under different part numbers. Ensure compatibility with RoHS 3 compliance standards before finalizing procurement orders.

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

Select this component when a compact form factor is critical due to its small X2-DFN1010-4 footprint. Choose this specific 0.9V fixed version for logic levels requiring low voltage rails. Consider the non-discharge feature if external pull-down resistors are undesirable in the circuit design. Verify input voltage stability remains above the minimum threshold during all operating conditions.

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

This part belongs to the AP7343 series of CMOS low dropout regulators designed for portable electronics. The series offers various fixed output voltages ranging from 0.9V to 3.6V. Different suffixes indicate variations in package type, such as SOT25, and internal discharge features. The AP7343D variants include auto-discharge functionality, whereas the base AP7343 does not.

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

AP7343D-09FS4-7B serves as a direct functional substitute if output discharge upon shutdown is required. Other AP7343 variants with different output voltages share identical pinouts but require voltage verification. Cross-reference datasheets to confirm thermal resistance and package dimensions match existing board layouts.