AP7343DQ-09W5-7

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

The AP7343DQ-09W5-7 is an automotive-compliant low dropout regulator manufactured by Diodes Incorporated. It provides a fixed output voltage of 0.9V with a maximum output current of 300mA. The device operates within an input voltage range of 1.7V to 5.25V and supports an ambient temperature range from -40°C to +125°C. Key electrical characteristics include a quiescent current of 35µA, ripple rejection of 75dB at 1kHz, and output noise of 60µVrms. It features integrated short-circuit protection, thermal shutdown, and an enable pin for power control.

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

• Automotive compliant design qualified to AEC-Q100 Grade 1 standards
• Integrated N-channel auto-discharge circuit for rapid output voltage decay
• High power supply ripple rejection capability for noise-sensitive applications
• Low output noise performance suitable for RF and precision circuits

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

• Infotainment power supplies
• Automotive RF supplies
• Camera modules
• Automotive POL in ADAS
• Automotive wireless communications

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

Verify the specific suffix 'D' indicates the inclusion of the internal discharge feature, as this distinguishes it from the standard non-discharge variant. Confirm that the 'Q' suffix denotes AEC-Q100 qualification and PPAP capability required for automotive manufacturing lines. Ensure the W5 package code matches the intended SOT25 footprint on the PCB layout.

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

Select this component when an enabled LDO with automatic output discharge is required for automotive systems. The 0.9V fixed output targets low-voltage digital logic or biasing needs. Verify that the input voltage remains above the minimum threshold while accounting for dropout voltage under full load conditions. Consider the thermal resistance of the SOT25 package for heat dissipation in dense layouts.

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

This part belongs to the AP7343Q family of high PSRR low noise LDOs designed for automotive environments. The 'D' designation specifically adds an auto-discharge function to safely pull down the output voltage when the device is disabled. It shares the same core CMOS architecture and electrical performance metrics as the non-discharge variants within the series.

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

AP7343Q-09W5-7

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 integrated N-channel auto-discharge resistor to rapidly pull down the output voltage when the enable pin is deactivated.

Is this component suitable for automotive applications?

Yes, the AP7343DQ series is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities for automotive use.