AP22818BKEWT-7

Overview

The AP22818BKEWT-7 is a USB power switch IC from Diodes Incorporated, designed for high-side load switching applications. It features an N-channel output with a maximum continuous current of 2A and a typical on-resistance of 75 milliohms. The device operates within a voltage range of 2.7V to 5.5V and includes integrated protection against fixed overcurrent, overtemperature, reverse current, short circuits, and under-voltage lockout. It utilizes a TSOT-25 surface-mount package and provides status flag indication without requiring external components.

Feature Summary

• Integrated high-side N-channel power switch optimized for USB and hot-plug applications
• Comprehensive fault protection including overcurrent, thermal, reverse current, and UVLO
• Built-in soft-start with controlled rise time to manage inrush current
• Open-drain status flag output with debouncing capability for accurate fault reporting

Applications

• USB port protection in laptops and tablets
• Hot-plug load switching in consumer electronics
• Power distribution in set-top boxes and telecom systems
• Overcurrent protection for peripheral devices

Procurement Notes

Verify the specific suffix 'BKEWT-7' against official Diodes Incorporated documentation to confirm pin configuration and enable polarity, as variations exist within the AP22818 family. Ensure compatibility with the target PCB footprint (TSOT-25) and validate that the 2A current rating meets system requirements. Cross-reference the datasheet for any recent product change notifications or environmental compliance updates prior to final procurement.

Selection Notes

Select this component when a single-channel high-side switch with integrated fault protection is required for low-voltage digital loads. The 75 milliohm on-resistance offers a balance between efficiency and cost for 2A applications. Consider the non-inverted enable input logic if direct microcontroller control is needed. Evaluate the thermal performance in the TSOT-25 package against the expected ambient temperature and duty cycle to ensure reliable operation within the specified -40°C to 85°C range.

Part Context

The AP22818 series represents Diodes Incorporated's solution for protecting downstream circuitry in portable and industrial electronics. This specific variant belongs to the USB power switch category, addressing the need for robust protection against electrical faults during connection events. It complements other PMIC offerings by providing discrete, easy-to-integrate protection for individual ports or loads without complex external circuitry.

Replacement Considerations

AP22818AKWT-7 is a manufacturer-recommended substitute for discontinued variants like AP2822GKTR-G1. Verify pin-out compatibility and enable polarity differences between the 'A' (high-active) and 'B' (low-active) suffixes before substitution.

FAQ

What is the function of the status flag output?

The open-drain status flag indicates fault conditions such as overcurrent or overtemperature. It includes a 6ms debounce feature to prevent false triggering.

Does the AP22818BKEWT-7 support reverse current blocking?

Yes, the device includes built-in reverse current protection to prevent backflow from the load to the source.

How does the device handle short-circuit events?

It provides automatic recovery from short-circuit conditions after the fault is cleared, ensuring system resilience without manual reset.