AP7343D-14FS4-7B

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

The AP7343D-14FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.4V with a guaranteed maximum load current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio performance of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power control, built-in thermal shutdown, and overcurrent protection. It utilizes the X2-DFN1010-4 (Type B) surface-mount package.

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

• Integrated enable pin allows precise power management by switching the regulator on or off
• High ripple rejection capability ensures stable operation in noisy environments
• Low output noise characteristic supports sensitive analog and RF circuitry
• Built-in discharge feature rapidly removes charge from the output capacitor upon shutdown

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

• RF power supply circuits
• Portable video devices
• Wireless communication modules
• Camera systems

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

Verify that the specific part number suffix FS4 corresponds to the X2-DFN1010-4 (Type B) package configuration required for your PCB layout. Confirm the 'D' designation indicates the inclusion of the auto-discharge function, as non-discharge variants exist within the same family. 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 fixed 1.4V rail is required with minimal footprint constraints due to its compact DFN packaging. Consider the 300mA current limit and dropout characteristics relative to your minimum input voltage. Verify that the 1% output voltage accuracy meets your system tolerance requirements and that the enable pin logic levels align with your control signals.

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

This device belongs to the AP7343 series of low dropout regulators designed for handheld communication equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V across different package options including SOT25. The AP7343D variant specifically includes an internal discharge resistor to accelerate output voltage decay when disabled.

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

AP7343-14FS4-7B serves as a direct functional substitute lacking the discharge feature. For packages without discharge, verify if rapid output discharge is critical for your application timing requirements.