AP7343D-21W5-7

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

The AP7343D-21W5-7 is a CMOS low dropout regulator manufactured by Diodes Incorporated, featuring a fixed 2.1V output voltage and a guaranteed maximum output current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and maintains high accuracy with a typical ripple rejection 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 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 ensures rapid output voltage decay upon shutdown
• High power supply ripple rejection capability minimizes noise interference in sensitive circuits
• Low quiescent current consumption optimizes battery life in portable applications
• Built-in thermal shutdown and fold-back current limit 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 output discharge feature, distinguishing it from non-discharge variants. Confirm the 'W5' suffix corresponds to the SOT-25 package type required for your PCB layout. Ensure the ordering code matches the exact 2.1V output designation to prevent functional mismatches in regulated power rails.

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

Select this component when a precise 2.1V rail is required with minimal footprint constraints. The integrated discharge feature makes it suitable for systems requiring fast power-down sequences. Verify that the input voltage remains above the minimum threshold while accounting for dropout voltage under full load conditions to maintain regulation stability.

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

This part belongs to the AP7343 family of high PSRR low-noise LDOs 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 adds output discharge capabilities compared to standard versions, enhancing system power management efficiency.

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

AP7343-21W5-7 (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 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 output discharge circuit.