AP7343D-30W5-7

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

The AP7343D-30W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 3.0 V with a guaranteed maximum output current of 300 mA. It operates within an input voltage range of 1.7 V to 5.25 V and features high power supply rejection ratio performance of 75 dB at 1 kHz alongside low output noise of 60 µVrms from 10 Hz to 100 kHz. The device incorporates an integrated enable pin for power control and includes built-in short-circuit protection and thermal shutdown mechanisms. Packaged in the compact SOT-25 surface-mount format, it ensures stable operation across a wide ambient temperature range from -40 °C to +85 °C.

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

• Integrated CMOS architecture delivering high output voltage accuracy and low quiescent current consumption
• Built-in discharge function that actively pulls down the output voltage when the enable signal is deactivated
• High ripple rejection capability combined with ultra-low output noise for sensitive analog circuitry
• Comprehensive protection suite including fold-back short-circuit current limiting and thermal shutdown

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

• RF power supply circuits requiring low noise regulation
• Portable video equipment and media players
• Wireless communication adapters and modules
• Smartphones and tablet devices

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

Verify the specific suffix 'D' indicates the inclusion of the auto-discharge feature on the output node, distinguishing it from non-discharge variants. Confirm the 'W5' package code corresponds to the SOT-25 form factor required for your PCB layout constraints. Ensure the ordering quantity aligns with the standard tape and reel packaging specifications provided by the manufacturer.

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

Select this component when a fixed 3.0 V rail is required with strict noise limitations for RF sections. The SOT-25 package offers a minimal footprint suitable for dense layouts. Consider the internal discharge path if rapid output voltage decay is necessary upon shutdown. Evaluate the thermal resistance characteristics against your expected power dissipation levels under maximum load conditions.

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

This part belongs to the AP7343 family of low dropout regulators designed for handheld communication equipment. The series provides various fixed output voltages ranging from 0.9 V to 3.6 V. The 'D' designation specifically denotes the version equipped with an output discharge resistor, while the base AP7343 lacks this feature. The W5 suffix identifies the SOT-25 five-pin package variant.

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

AP7343-30W5-7 (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 connected between the output and ground, which actively pulls down the output voltage when the device is disabled.

How does the enable pin operate?

The EN pin controls the regulator state; driving it high turns the device on, while pulling it low activates shutdown mode and engages the output discharge feature.