AP7343D-185W5-7

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

The AP7343D-185W5-7 is a CMOS low dropout regulator featuring a fixed 1.85V output and 300mA guaranteed current capability. It operates within an input voltage range of 1.7V to 5.25V, maintaining ±1% output accuracy. The device incorporates high ripple rejection of 75dB at 1kHz and low output noise of 60µVrms. Key functional additions include an enable pin for power control and an integrated auto-discharge circuit for rapid output voltage decay upon shutdown.

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

• Integrated N-channel auto-discharge resistor rapidly bleeds output charge when disabled
• High ripple rejection ratio ensures stable performance against input supply variations
• Low quiescent current design optimizes efficiency in battery-powered applications
• Built-in thermal shutdown and fold-back current limit protect against overload conditions

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

• RF power supplies
• Portable media players
• Wireless communication modules
• Smartphones and tablets

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

Verify the specific suffix 'D' indicates the inclusion of the output discharge feature, distinguishing it from standard variants. Confirm the 'W5' designation corresponds to the SOT25 package type required for your PCB layout. Ensure the ordering code matches the exact 1.85V output specification needed for your circuit design.

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

Select this component when low output noise and high PSRR are critical for sensitive analog or RF loads. The integrated discharge function makes it suitable for systems requiring fast power-down sequences. Verify that the input voltage remains above the minimum threshold while accounting for dropout voltage under maximum load conditions.

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

This part belongs to the AP7343 series of low-dropout regulators manufactured by Diodes Incorporated. The series offers various fixed output voltages and packaging options, including X2-DFN1010-4 and SOT25. The 'D' variant specifically adds the auto-discharge functionality compared to the base model.

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

AP7343-185W5-7 (Standard version without discharge)

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 an internal N-channel auto-discharge resistor to quickly remove charge from the output capacitor when the device is disabled.

How does the enable pin operate?

Driving the EN pin high turns the regulator on, while pulling it low activates shutdown mode and engages the auto-discharge feature if present.