AP7343D-29FS4-7B

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

The AP7343D-29FS4-7B is a fixed-output low dropout regulator providing 2.9V at up to 300mA, housed in an X2-DFN1010-4 (Type B) package with output discharge. It operates within a 1.7V to 5.25V input range and achieves 75dB ripple rejection at 1kHz. Quiescent current is 35µA typical, with 60µVrms output noise from 10Hz to 100kHz. Line regulation is 0.02%/V, load regulation is 15mV, and accuracy is ±1%. Dropout voltage is 0.30V typical at 300mA.

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

• Integrated resistor network provides precise fixed output voltage without external feedback components.
• Built-in N-channel auto-discharge rapidly removes charge from the output capacitor upon shutdown.
• CMOS architecture ensures minimal quiescent current consumption for battery-powered applications.
• Includes thermal shutdown and fold-back short-circuit protection for enhanced reliability.

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

• RF power supply circuits
• Portable media players
• Wireless communication modules

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

Verify the specific suffix '7B' corresponds to the 10,000-unit tape and reel packaging configuration. Confirm the 'D' designation indicates the inclusion of the internal output discharge feature. Ensure the ordering code matches the required 2.9V fixed output specification before finalizing procurement orders.

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

Select this component when a compact footprint is required alongside high power supply rejection ratio performance. The integrated discharge function simplifies system power sequencing by preventing floating outputs. Verify that the 2.9V fixed output aligns with the target load requirements and that the input voltage remains above the minimum dropout threshold during operation.

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

This device belongs to the AP7343 series of low dropout regulators manufactured by Diodes Incorporated. The series utilizes a CMOS process to deliver high accuracy and low noise characteristics. The part is designed for dense PCB layouts using small surface-mount packages suitable for portable electronic devices.

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

AP7343-29FS4-7B

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

What is the function of the EN pin?

The Enable pin controls the regulator state; driving it high activates the output, while pulling it low initiates shutdown mode.

How does the output discharge feature operate?

When the enable pin is pulled low, an internal N-channel transistor connects the output to ground to rapidly discharge the output capacitor.