AP7343DQ-18W5-7

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

The AP7343DQ-18W5-7 is an automotive-compliant low dropout regulator manufactured by Diodes Incorporated. It provides a fixed 1.8V output with a guaranteed maximum 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 specifications include a quiescent current of 35µA, ripple rejection of 75dB at 1kHz, and output noise of 60µVrms. It features integrated thermal shutdown, current limit protection, and an enable pin for power control.

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

• Automotive compliant with AEC-Q100 qualification and PPAP capability
• Integrated N-channel auto-discharge for rapid output voltage decay upon shutdown
• High power supply ripple rejection and low output noise for sensitive circuits
• Built-in thermal shutdown and foldback short-circuit current protection

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

• Infotainment power supplies
• Automotive RF supplies
• Cameras
• 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 auto-discharge feature, which distinguishes this variant from the standard non-discharge version. Confirm that the 'Q' suffix denotes compliance with automotive change control requirements and IATF 16949 manufacturing standards. Ensure the W5 package code matches the required SOT25 footprint for your PCB layout constraints before finalizing procurement.

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

Select this component when designing for noise-sensitive automotive environments requiring precise voltage regulation. The built-in discharge function is critical if fast output voltage decay is necessary during system shutdown states. Verify that the 1.8V fixed output aligns with the target load requirements and that the 300mA current capacity meets peak transient demands without exceeding thermal limits in the chosen enclosure.

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

This part belongs to the AP7343Q family of high PSRR low noise LDOs designed specifically for automotive applications. Unlike standard industrial regulators, these devices undergo rigorous qualification processes including AEC-Q100 testing. The D-suffix variants incorporate an additional discharge transistor not present in the base Q-series, offering enhanced control over output state transitions in complex vehicle electronic architectures.

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

AP7343Q-18W5-7 (Non-discharge variant)

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

What is the function of the 'D' suffix in the AP7343DQ-18W5-7 model?

The 'D' suffix indicates that the regulator includes an internal N-channel auto-discharge resistor. This feature actively pulls the output voltage down to ground when the enable pin is driven low, ensuring rapid shutdown.

How does the AP7343DQ-18W5-7 handle short-circuit conditions?

The device incorporates a foldback short-circuit protection circuit. When the output is shorted to ground, the output current is clamped to approximately 55mA to prevent overheating and damage to the regulator.