AP7343D-32FS4-7B

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

The AP7343D-32FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated. It provides a nominal output voltage of 3.2V with a guaranteed maximum output current of 300mA. The device operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz. Quiescent current is specified as low as 35µA, while standby current drops to 1.0µA maximum when disabled. The unit includes thermal shutdown and fold-back short-circuit protection, housed in an X2-DFN1010-4 package.

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

• Integrated enable pin for active control of regulator operation and shutdown mode
• Built-in discharge circuit to rapidly remove charge from the output capacitor upon disable
• High ripple rejection capability designed to minimize noise in sensitive signal paths
• Low output noise specification suitable for powering RF and communication circuits

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

• RF power supplies
• Portable media players
• Wireless adapters
• Cameras

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

Verify the specific suffix '7B' corresponds to the required tape and reel packaging quantity of 10,000 units per carrier. Confirm that the 'D' designation indicates the inclusion of the auto-discharge feature, which differs from non-discharge variants. Ensure the ordering code matches the exact 3.2V output requirement to avoid functional mismatches in the design.

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

Select this component when a precise 3.2V rail is required with minimal footprint constraints. The X2-DFN1010-4 package supports dense PCB layouts compared to larger alternatives. Consider the internal discharge resistor if rapid output voltage decay is necessary during system sleep states. Verify input voltage headroom against the dropout characteristics at peak load currents.

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

This part belongs to the AP7343 series of CMOS low dropout regulators. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' prefix denotes the version with an integrated output discharge resistor, distinguishing it from standard versions without this feature. The FS4 suffix identifies the specific X2-DFN1010-4 surface mount package type.

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

AP7343-32FS4-7B serves as a direct replacement for the non-discharge variant, provided the discharge function does not interfere with external circuit requirements.