AP7340D-185FS4-7

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

The AP7340D-185FS4-7R is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 1.85V with an accuracy of ±1%. The device guarantees an output current of 150mA and operates within an input voltage range of 1.7V to 5.25V. Key electrical specifications include a quiescent current of 35µA, ripple rejection of 75dB at 1kHz, and output noise of 60µVrms from 10Hz to 100kHz. It features an enable pin for power control and short-circuit protection.

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

• Integrated auto-discharge circuitry that automatically pulls the output to ground when disabled
• High power supply ripple rejection capability of 75dB at 1kHz
• Low output noise performance suitable for sensitive RF applications
• Built-in thermal and current limit protection mechanisms

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

• Smart Phone/PAD
• RF Supply
• Cameras
• Portable Video
• Wireless Communication

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

Verify the specific suffix 'D' in the part number to confirm the inclusion of the internal discharge resistor network, as this distinguishes it from standard variants. Ensure the ordering code matches the required X2-DFN1010-4 package configuration. Cross-reference the manufacturer datasheet revision to validate all electrical parameters against the latest published specifications before finalizing procurement.

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

Select this component when a fixed 1.85V rail is required with minimal footprint constraints. The integrated discharge feature simplifies system shutdown sequences by preventing floating outputs. Verify that the application load does not exceed the guaranteed 150mA continuous current rating. Consider the low quiescent current for battery-operated designs requiring extended standby life.

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

This device belongs to the AP7340 series of CMOS low dropout regulators designed for portable electronics. The 'D' variant specifically includes an N-channel auto-discharge function on the output pin. It utilizes the X2-DFN1010-4 package to support dense PCB layouts while maintaining high thermal efficiency and electrical performance standards.

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

AP7340-185FS4-7R

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

What is the function of the 'D' suffix in the part number?

The 'D' indicates that the regulator includes an internal auto-discharge circuit. When the enable pin is pulled low, this circuit actively discharges the output capacitor to ground.

How does the enable pin operate?

The EN pin turns the regulator on when driven high and shuts it down when pulled low. If unused, it should be tied to VIN to keep the output active.