AP7343D-33FS4-7B

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

The AP7343D-33FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a stable 3.3V output with an accuracy of ±1%. The device supports a maximum continuous output current of 300mA and operates within an input voltage range of 1.7V to 5.25V. Key electrical characteristics include a ripple rejection ratio of 75dB at 1kHz, a typical quiescent current of 35µA, and an output noise voltage of 60µVrms across the 10Hz to 100kHz bandwidth. The component is housed in an X2-DFN1010-4 (Type B) package.

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

• Integrated enable pin for power control and shutdown management
• Built-in short-circuit protection and thermal shutdown circuitry
• Low equivalent series resistance requirements for stability
• High power supply ripple rejection capability

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

• Smart phones and tablets
• RF supplies
• Cameras
• Portable videos
• Wireless communication equipment

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

Verify that the specific part number matches the required output voltage and package type. Confirm the presence of the 'D' suffix indicates the integrated auto-discharge feature on the output pin. Ensure compatibility with RoHS 3 and halogen-free manufacturing standards. Check datasheet specifications for thermal dissipation requirements relative to the PCB layout design.

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

Select this component when a compact footprint is required alongside high ripple rejection performance. The device is suitable for battery-powered applications due to its low quiescent current consumption. Consider the thermal resistance values provided in the datasheet when designing for high ambient temperatures or dense PCB layouts. Verify that the load transient response meets the system's dynamic power requirements.

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

This component belongs to the AP7343 family of low dropout regulators designed for handheld communication equipment. The family offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically includes an internal discharge resistor to rapidly remove charge from the output capacitor upon shutdown. The FS4 suffix denotes the X2-DFN1010-4 package configuration.

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

AP7343-33FS4-7B

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

What is the function of the EN pin?

The EN pin controls the operation of the regulator. Driving it high enables the output, while pulling it low activates the shutdown mode.

How does the D suffix affect the device behavior?

The D suffix indicates the inclusion of an N-channel auto-discharge transistor that connects the output to ground when the device is disabled.

Is the exposed pad connected to ground internally?

No, the exposed pad is not internally connected to any pin. It should be soldered to a large copper area for thermal dissipation and connected to GND or left open.