AP7347EQ-17FDCWR-7R

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

The AP7347EQ-17FDCWR-7R is a fixed-output low-dropout regulator manufactured by Diodes Incorporated, delivering a nominal output voltage of 1.7V with ±1% accuracy. It supports up to 500mA output current within an input voltage range of 1.7V to 5.5V. The device features a typical power supply rejection ratio of 75dB at 1kHz and low output noise of 60µVrms from 10Hz to 100kHz. Quiescent current is specified as low as 75µA. It includes a power-good indicator, active output discharge, and thermal shutdown protection. The component is housed in a U-DFN2020-6 (SWP) package with code FDCWR.

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

• Automotive-grade qualification compliant with AEC-Q100 standards for high reliability.
• Integrated power-good open-drain output for supply monitoring and sequencing.
• Active output discharge ensures known system startup states when disabled.
• Foldback short-circuit current limiting protects against overcurrent conditions.

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

• Infotainment power supplies
• Automotive RF supplies
• ADAS point-of-load applications
• Automotive wireless communication systems

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

Verify the specific ordering suffix matches the required package type and tape-and-reel quantity. Confirm that the automotive grade designation aligns with project requirements for change control and PPAP capability. Ensure the fixed output voltage corresponds exactly to the design specification before procurement.

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

Select this component for noise-sensitive automotive environments requiring high PSRR and low quiescent current. Verify that the input voltage remains within the 1.7V to 5.5V range under all operating conditions. Consider the thermal resistance characteristics of the U-DFN2020-6 package for adequate heat dissipation at maximum load currents.

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

This part belongs to the AP7347EQ series of low-dropout regulators designed for automotive applications. It offers high output voltage accuracy and low noise performance suitable for sensitive analog and RF circuits. The series is manufactured in IATF 16949 certified facilities to meet strict automotive quality standards.

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

Direct replacements include other parts within the AP7347EQ family with different output voltages or packages, such as AP7347EQ-18FDCWR-7R for 1.8V output. Cross-family replacements require verification of pin compatibility, electrical specifications, and automotive qualification status.

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

What is the function of the PG pin?

The PG pin is an open-drain output that indicates when the output voltage exceeds the power-good threshold. It goes into a high-impedance state when VOUT is above the threshold and is pulled low when VOUT drops below the threshold or the device is disabled.

How does the device handle short-circuit conditions?

The AP7347EQ incorporates foldback short-circuit current limiting. When the output is shorted to ground, the current is clamped to approximately 180mA to protect the regulator from damage due to overheating.