AP7343D-17W5-7

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

The AP7343D-17W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 1.7V 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 shutdown control and includes built-in output discharge functionality. Packaged in the SOT-25-5 surface-mount format, 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 resistor that actively pulls down the output voltage when the device is disabled
• High ripple rejection capability designed to minimize noise in sensitive analog and RF circuits
• Low quiescent current consumption optimized for battery-powered portable applications
• 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 supplies
• Portable media players
• Wireless communication devices
• 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' package code corresponds to the SOT-25-5 footprint required for your PCB layout. Ensure the ordering quantity aligns with the manufacturer's standard tape and reel packaging specifications.

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

Select this component when a fixed 1.7V rail is required alongside active output discharge for rapid system shutdown. The SOT-25 package offers a compact solution for space-constrained designs. Consider the thermal resistance characteristics if high load currents are sustained, as power dissipation increases with higher input-to-output voltage differentials.

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

This part belongs to the AP7343 family of CMOS low-dropout regulators known for high PSRR and low noise. The 'D' designation specifically denotes the version equipped with an integrated auto-discharge mechanism, while 'W5' identifies the five-pin SOT-25 surface-mount package configuration used for dense board layouts.

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

AP7343-17W5-7 (Standard version without auto-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 integrated N-channel auto-discharge resistor, which actively pulls the output voltage to ground 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 internal discharge resistor to rapidly reduce the output voltage.