AP7343D-27FS4-7B

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

The AP7343D-27FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 2.7V 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 power control, built-in thermal shutdown, and overcurrent protection. It is housed in an X2-DFN1010-4 package and supports an operating temperature range from -40°C to +85°C.

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

• Integrated enable pin allows precise power management and shutdown control
• High ripple rejection and low output noise ensure clean power delivery
• Built-in thermal shutdown and fold-back short-circuit current protect against overload

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

• RF supplies
• Cameras
• Portable media players
• Wireless communication devices

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

Verify the specific suffix 'D' indicates the presence of an internal auto-discharge feature on the output when disabled. Confirm the 'FS4' designation corresponds to the X2-DFN1010-4 Type B package. Ensure the ordering code matches the required 2.7V fixed output voltage. Check datasheet revision for any updates to electrical characteristics or marking information before finalizing procurement specifications.

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

Select this component when a compact footprint is required alongside high PSRR performance. The 2.7V output is suitable for powering specific logic levels or RF circuits. Consider the 300mA current limit for load requirements. The inclusion of the discharge feature distinguishes it from non-discharge variants, affecting output behavior during shutdown states.

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 ranging from 0.9V to 3.6V. The 'D' suffix denotes the version with output discharge capability, while 'FS4' specifies the small surface-mount package type used for dense PCB layouts.

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

AP7343-27FS4-7B is the non-discharge variant of the same package and voltage.

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

What is the function of the EN pin?

The EN pin controls the regulator's operation; driving it high enables the output, while pulling it low activates shutdown mode.

Does this part include output discharge?

Yes, the 'D' in the part number AP7343D-27FS4-7B indicates that the device includes an internal N-channel auto-discharge resistor to pull down the output voltage when disabled.