AP7343D-18W5-7

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

The AP7343D-18W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing an 1.8V output with a guaranteed maximum load current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features a typical power supply rejection ratio of 75dB at 1kHz. The device incorporates an enable pin for power control and includes internal discharge circuitry to rapidly remove charge from the output capacitor when disabled. Packaged in a surface-mount SOT-25-5 configuration, it supports an operating ambient temperature range from -40°C to +85°C.

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

• Integrated N-channel auto-discharge function to actively pull down the output voltage upon shutdown
• High ripple rejection capability ensuring stable performance against input line noise
• Low quiescent current consumption optimized for battery-powered portable applications
• Built-in thermal shutdown and fold-back current limiting for robust protection

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

• RF power supply circuits
• Portable video equipment
• Wireless communication modules
• Camera systems

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

Verify that the specific part number suffix 'D' confirms the inclusion of the output discharge feature, as standard variants lack this function. Ensure the 'W5' suffix corresponds to the SOT-25 package type required for your PCB layout. Confirm RoHS compliance status and check for any automotive-grade alternatives if extended temperature ranges are needed.

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

Select this component when a fixed 1.8V rail is required with active output discharge capabilities. The SOT-25 package offers a compact footprint suitable for dense layouts. Consider the 300mA current limit and dropout characteristics relative to your minimum input voltage constraints. Verify that the enable pin logic levels align with your system's control signals.

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

This device belongs to the AP7343 family of CMOS low dropout regulators designed for low-power handheld communication equipment. The series provides various fixed output voltages ranging from 0.9V to 3.6V. The 'D' designation specifically indicates the version with integrated output discharge, distinguishing it from the standard non-discharge variant.

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

AP7343-18W5-7 (Non-discharge variant)

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 integrated N-channel auto-discharge resistor to actively pull down the output voltage when the enable pin is low.

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 output discharge circuit.