AP7343D-11FS4-7B

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

The AP7343D-11FS4-7B is a fixed-output low dropout regulator providing an output voltage of 1.1V with a maximum output current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio of 75dB at 1kHz. The device includes an enable pin for shutdown control, thermal shutdown protection, and short-circuit current limiting. It utilizes the X2-DFN1010-4 (Type B) package and supports operation from -40°C to +85°C.

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

• Integrated discharge function for rapid output voltage decay upon disable
• High ripple rejection capability for noise-sensitive applications
• Low quiescent current consumption for extended battery life
• Built-in thermal shutdown and fold-back short-circuit protection

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

• RF power supplies
• Portable media players
• Wireless communication modules
• Smartphones and tablets

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

Verify the specific suffix 'D' indicates the presence of the internal output discharge feature compared to non-discharge variants. Confirm the 'FS4' designation corresponds to the X2-DFN1010-4 (Type B) package type required for your PCB layout. Ensure the '7B' packing code matches your automated assembly equipment specifications before finalizing orders.

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

Select this component when a precise 1.1V rail is required with minimal footprint constraints. The integrated discharge feature aids in meeting system power-down timing requirements. Verify that the input voltage remains above the dropout threshold across the full load range to maintain regulation stability under all operating conditions.

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

This part belongs to the AP7343 series of high PSRR LDOs manufactured by Diodes Incorporated. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' suffix specifically denotes the version with an auto-discharge FET, distinguishing it from standard versions without this functionality.

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

AP7343-11FS4-7B

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 circuit to rapidly pull down the output voltage when the enable pin is deactivated.

How does the enable pin operate?

Driving the EN pin high turns the regulator on, while pulling it low activates the shutdown mode and engages the discharge function if present.