AP7343D-28FS4-7

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

The AP7343D-28FS4-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 2.8V 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 and low output noise of 60µVrms from 10Hz to 100kHz. The device includes an enable pin for shutdown control, built-in discharge functionality, and protection against overcurrent and thermal overload. It is housed in an X2-DFN1010-4 package.

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

• Integrated resistor network provides precise fixed output voltage accuracy.
• Built-in auto-discharge circuit ensures rapid output voltage decay upon shutdown.
• CMOS process technology enables low quiescent current consumption.
• Includes comprehensive protection mechanisms such as current limit and thermal shutdown.

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

• RF supplies
• Cameras
• Portable videos
• Wireless communication

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

Verify the specific suffix 'D' indicates the inclusion of the output discharge feature, which distinguishes it from non-discharge variants. Confirm the 'FS4' designation corresponds to the X2-DFN1010-4 Type B package. Ensure the ordering code matches the required 2.8V fixed output specification before finalizing procurement to avoid functional mismatches in the design.

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

Select this component when a compact footprint is required alongside low noise performance for sensitive analog circuits. The integrated discharge feature simplifies system power management by eliminating external components needed for output bleed-down. Verify that the input voltage remains within the specified operating range to maintain stability and ensure adequate headroom for the desired load current.

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

This part belongs to the AP7343 series of low dropout regulators designed for handheld communication equipment. The series offers various fixed output voltages and packaging options, including SOT25. The AP7343D variant specifically incorporates the discharge function, differentiating it from standard versions while maintaining the same core electrical characteristics and physical dimensions.

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

AP7343-28FS4-7

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

What is the function of the 'D' suffix in the part number?

The 'D' suffix indicates that the regulator includes a built-in auto-discharge feature on the output pin, allowing the output voltage to drop rapidly when the device is disabled.

How does the enable pin operate?

The EN pin turns the regulator on when driven high and puts it into shutdown mode when pulled low. It must not be left floating during operation.