AP7343-18FS4-7B

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

The AP7343-18FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 1.8V output with a maximum 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. The device utilizes X2-DFN1010-4 (Type B) packaging and includes an enable pin for power control. Electrical characteristics include a quiescent current as low as 35µA, output voltage accuracy of ±1%, and thermal shutdown protection.

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

• Integrated enable pin allows precise power management and shutdown control
• High ripple rejection capability ensures clean power delivery in noisy environments
• Low output noise design supports sensitive RF and communication circuits
• Built-in short-circuit and thermal protection safeguards against overcurrent conditions

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

• Smart phones and tablets
• RF power supplies
• Portable media players
• Wireless adapters

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 RoHS compliance status and lead-free specifications match project requirements. Check datasheet revision DS37952 Rev. 14 for any recent updates to electrical parameters or marking information before finalizing procurement.

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

Select this component when a compact footprint and low quiescent current are critical for battery-operated devices. The 1.8V fixed output suits digital logic and memory interfaces requiring that specific rail. Ensure input voltage remains above the dropout threshold for the expected load current to maintain regulation stability.

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

This part belongs to the AP7343 family of low dropout regulators designed for low-power handheld applications. The series offers various fixed output voltages and packages, including SOT25 and DFN options. The AP7343-18 variant specifically targets 1.8V rails common in portable electronics.

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

AP7343D-18FS4-7B provides the same 1.8V output but includes an internal discharge resistor for faster output voltage decay upon shutdown.