AP7343D-18FS4-7B

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

The AP7343D-18FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a stable 1.8V output at up to 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio (PSRR) of 75dB at 1kHz. The device incorporates an enable pin for power control and includes internal discharge circuitry. It is housed in an X2-DFN1010-4 package with a thermal resistance of 237°C/W.

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

• Integrated N-channel auto-discharge function to rapidly reduce output voltage when disabled
• High ripple rejection capability ensuring clean power delivery for sensitive loads
• Low quiescent current consumption optimized for battery-powered applications
• Built-in thermal shutdown and fold-back short-circuit protection mechanisms

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

• RF power supplies
• Portable media players
• Wireless communication modules
• 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 'FS4' designation corresponds to the X2-DFN1010-4 Type B package. Ensure the '7B' suffix matches the required tape and reel quantity specifications for your manufacturing line.

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

Select this component when a fixed 1.8V rail is required with minimal footprint constraints. The integrated discharge feature simplifies system power sequencing by preventing floating outputs. Verify that the application load does not exceed the guaranteed 300mA continuous output current rating under all operating temperature conditions.

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

This part belongs to the AP7343 series of CMOS low dropout regulators designed for low-power handheld equipment. The series offers various fixed output voltages ranging from 0.9V to 3.6V. The 'D' variant specifically adds an auto-discharge path, while the 'FS4' package provides a compact surface-mount solution suitable for dense PCB layouts.

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

AP7343-18FS4-7B serves as a direct functional substitute if the auto-discharge feature is not required in the design.