AP7343D-17FS4-7B

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

The AP7343D-17FS4-7B is a fixed-output low dropout regulator providing 1.7V at up to 300mA, housed in an X2-DFN1010-4 (Type B) package with output discharge functionality. It operates within a 1.7V to 5.25V input range and achieves ±1% output voltage accuracy. Key electrical characteristics include a typical ripple rejection of 75dB at 1kHz, a quiescent current of 35µA, and an output noise of 60µVrms from 10Hz to 100kHz.

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

• Integrated N-channel auto-discharge resistor for rapid output voltage decay upon shutdown
• High power supply ripple rejection capability across varying load conditions
• Low output noise profile suitable for sensitive RF circuitry
• Built-in thermal shutdown and foldback short-circuit protection

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

• RF power supply rails
• Portable media players
• Wireless communication modules
• Smartphone camera subsystems

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

Verify the specific suffix 'D' confirms the inclusion of the internal auto-discharge feature, as standard variants lack this function. Confirm the 'FS4' designation matches the required X2-DFN1010-4 footprint and pinout. Ensure the ordering code aligns with the 1.7V fixed output requirement rather than adjustable versions.

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

Select this component when a compact surface-mount solution with integrated output discharge is required. The X2-DFN1010-4 package supports dense PCB layouts while maintaining thermal performance. Verify that the 1.7V fixed output meets system requirements without needing external resistive dividers.

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

This device belongs to the AP7343 family of high PSRR LDOs manufactured by Diodes Incorporated. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically includes the auto-discharge feature, distinguishing it from the base AP7343 model which retains charge on the output capacitor.

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

AP7343-17FS4-7B serves as a direct functional substitute if the auto-discharge feature is not required.