AP7343-22FS4-7B

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

The AP7343-22FS4-7B is a fixed-output low dropout regulator manufactured by Diodes Incorporated, providing a nominal output voltage of 2.2V with a maximum continuous output current of 300mA. It operates within an input voltage range of 1.7V to 5.25V and features high power supply rejection ratio performance of 75dB at 1kHz alongside low output noise of 60µVrms from 10Hz to 100kHz. The device incorporates an enable pin for power management control and includes internal protections such as thermal shutdown and fold-back short-circuit limiting. Packaged in the compact X2-DFN1010-4 (Type B) footprint, 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 enable input allows precise power switching between active regulation and low-power shutdown modes
• High ripple rejection capability effectively suppresses input supply noise across varying load conditions
• Low output noise characteristic ensures clean power delivery for sensitive analog and RF circuitry
• Built-in thermal shutdown and current limit mechanisms protect the device during overload or overheating events

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

• Smart phones and tablets
• RF supplies
• Cameras
• Portable videos
• Wireless communication devices

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

Verify the specific ordering suffix FS4-7B corresponds to the required X2-DFN1010-4 package and tape-and-reel quantity when sourcing. Confirm that the non-discharge variant matches system requirements regarding output capacitor discharge behavior after shutdown. Ensure compatibility with RoHS 3 and halogen-free material specifications mandated by the target market regulations before finalizing procurement orders.

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

Select this component when a stable 2.2V rail is required with minimal board space due to its small footprint. Consider the 300mA current capacity against peak load demands to ensure adequate headroom. Evaluate the need for the enable pin functionality versus tying it permanently high if power sequencing is not required. Verify input voltage stability remains within the specified operating range under all expected line conditions.

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

This part belongs to the AP7343 family of low dropout regulators designed for portable electronics. It shares core architectural features with other variants in the series, differing primarily in fixed output voltage settings and packaging options. The family emphasizes low quiescent current and high PSRR to extend battery life in handheld devices while maintaining signal integrity in noise-sensitive applications.

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

AP7343D-22FS4-7B serves as a direct functional substitute featuring integrated output discharge capabilities.