AP7343D-29W5-7

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

The AP7343D-29W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 2.9V. It operates within an input voltage range of 1.7V to 5.25V and supports a guaranteed output current of 300mA. The device features a quiescent current of 35µA and ripple rejection of 75dB at 1kHz. Packaged in SOT-25, it includes an enable pin and built-in output discharge for rapid shutdown.

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

• Integrated N-channel auto-discharge resistor rapidly discharges the output capacitor when disabled
• High power supply ripple rejection ratio ensures stable operation under noisy conditions
• Low noise architecture minimizes interference for sensitive analog and RF circuits
• Built-in thermal shutdown and fold-back current limit protect against overload

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

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

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

Verify the specific suffix 'D' indicates the inclusion of the internal output discharge feature, which distinguishes this variant from standard versions. Confirm the 'W5' designation corresponds to the SOT-25 package type required for your PCB layout. Ensure the ordering code matches the exact 2.9V output specification needed for your circuit design.

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

Select this component when a compact solution with fast shutdown capability is required. The integrated discharge function simplifies external circuitry compared to non-discharge variants. Verify that the 2.9V fixed output aligns with the target load requirements before finalizing the design.

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

This part belongs to the AP7343 series of CMOS low-dropout regulators designed for handheld equipment. The series offers various fixed output voltages and packaging options. The 'D' suffix specifically denotes the version equipped with an internal auto-discharge mechanism for improved power management efficiency.

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

AP7343-29W5-7 (Non-discharge variant)

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 rapidly remove charge from the output capacitor when the device is disabled.

How does the enable pin operate?

The regulator is enabled by driving the EN pin high and enters shutdown mode when the pin is pulled low. It must not be left floating during operation.