AP7343-31FS4-7B

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

The AP7343-31FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 3.1V with ±1% accuracy. It supports an input voltage range from 1.7V to 5.25V and delivers up to 300mA of output current. The device features high power supply ripple rejection of 75dB at 1kHz and low output noise of 60µVrms across the 10Hz to 100kHz bandwidth. Quiescent current is maintained at a maximum of 60µA. It operates within an ambient temperature range of -40°C to +85°C and includes thermal shutdown and short-circuit protection.

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

• Integrated enable pin for precise power management control
• High ripple rejection ratio ensures clean power delivery
• Low output noise suitable for sensitive RF circuits
• Built-in thermal shutdown and fold-back current limiting

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

• Smart phones and tablets
• RF power supplies
• Cameras
• Portable media players
• Wireless communication adapters

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

Verify the specific suffix FS4-7B corresponds to the X2-DFN1010-4 (Type B) package and tape-and-reel quantity when sourcing. Confirm RoHS compliance and halogen-free status requirements against project specifications. Ensure the ordering code matches the required 3.1V fixed output variant. Cross-reference datasheet revision DS37952 Rev. 14 for latest electrical characteristics.

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

Select this component for applications requiring a compact footprint and stable 3.1V rail. The X2-DFN1010-4 package offers minimal PCB area usage. Consider the non-discharge feature inherent in the base AP7343 model versus the discharge option in AP7343D variants if rapid output decay is not required. Verify input capacitor placement for stability.

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

This part belongs to the AP7343 family of 300mA LDOs designed for handheld communication equipment. It utilizes a CMOS process to achieve low quiescent current and high PSRR. The series provides various fixed output voltages ranging from 0.9V to 3.6V. The FS4 suffix denotes the specific X2-DFN1010-4 Type B surface-mount package configuration.

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

AP7343-31W5-7B serves as a package alternative using SOT25. For parts with integrated output discharge functionality, consider AP7343D-31FS4-7B. Automotive-grade equivalents are available under the separate AP7343Q datasheet.