AP7343D-20W5-7

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

The AP7343D-20W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 2.0V with an accuracy of ±1%. It supports a guaranteed output current of 300mA and operates within an input voltage range of 1.7V to 5.25V. The device features a typical ripple rejection ratio of 75dB at 1kHz and a low quiescent current of 35µA. Packaged in SOT-25, it includes an enable pin for power control and built-in output discharge functionality.

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

• Integrated N-channel auto-discharge resistor to rapidly release stored charge from the output capacitor when disabled
• High power supply ripple rejection capability to minimize noise coupling into sensitive downstream circuits
• Low output noise performance suitable for powering RF and precision analog components
• Built-in thermal shutdown and fold-back current limiting to protect against overheating and short circuits

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

• RF power supply rails
• Portable video equipment
• Wireless communication modules
• Smartphones and tablets

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

Verify the specific suffix 'D' indicates the inclusion of the internal output discharge feature, which distinguishes this variant from standard versions lacking this function. Confirm the 'W5' suffix corresponds to the SOT-25 package type required for your PCB layout constraints. Ensure the ordering code matches the exact 2.0V fixed output specification needed for the design.

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

Select this component when a compact surface-mount solution is required for low-noise power regulation. The SOT-25 package offers a small footprint ideal for dense layouts. The integrated discharge feature simplifies system power sequencing by ensuring the output discharges automatically upon shutdown, eliminating the need for external pull-down resistors.

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

This part belongs to the AP7343 series of CMOS LDO regulators designed for handheld and portable applications. The series provides various fixed output voltages ranging from 0.9V to 3.6V. The 'D' designation specifically denotes the version with output discharge, while 'W5' identifies the SOT-25 packaging option used for space-constrained designs.

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

AP7343-20W5-7 (Standard version without output discharge)

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 resistor connected to the output. This allows the output voltage to drop rapidly when the enable pin is pulled low.

How does the enable pin operate?

The EN pin controls the state of the regulator. Driving the pin high turns the regulator on, while pulling it low disables the output and activates the internal discharge path.