AP7343D-36W5-7

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

The AP7343D-36W5-7 is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 3.6V output with a maximum current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features a typical ripple 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 compact SOT-25-5 surface-mount format, it supports operation across an ambient temperature range of -40°C to +85°C.

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

• Integrated N-channel auto-discharge function to quickly pull down the output voltage upon shutdown
• High power supply ripple rejection capability for noise-sensitive applications
• Low quiescent current consumption to extend battery life in portable devices
• Built-in thermal shutdown and fold-back current limiting for enhanced reliability

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

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

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 versions 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 higher temperature ratings are needed.

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

Select this component when a fixed 3.6V rail is required with minimal footprint constraints. The integrated discharge feature makes it suitable for systems requiring rapid power-down states. Verify that the input voltage remains above the dropout threshold under all load conditions to maintain regulation stability.

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 equipment. The series offers various fixed output voltages and packaging options, including X2-DFN1010-4 and SOT-25. The 'D' variant specifically denotes the presence of an output discharge resistor, distinguishing it from the base AP7343 model.

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

AP7343-36W5-7 (Non-discharge version)

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 feature, 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 output discharge circuit.