ET9931

Overview

The ET9931 is an overvoltage and surge protection integrated circuit designed for portable electronic devices. It supports an input voltage range of 2.3V to 28V and utilizes an external switch configuration. The device provides robust protection against reverse polarity, inrush current, and transient voltage spikes. Key electrical characteristics include a typical overvoltage lockout threshold of 6.1V with a fast response time of 50ns. It features adjustable overcurrent protection ranging from 0.1A to 2.3A, with automatic recovery capabilities after fault conditions are cleared.

Feature Summary

• Integrates overvoltage, overcurrent, and thermal protection mechanisms for comprehensive input safety
• Features ultra-fast 50ns response time to disconnect the path during surge events
• Supports adjustable current limiting thresholds to accommodate various load requirements
• Includes automatic restart functionality following temporary overload or overtemperature faults

Applications

• Portable consumer electronics input protection
• Battery-powered device power management circuits
• USB charging port surge suppression
• Mobile phone and tablet power input stages

Procurement Notes

Verify the specific datasheet revision and ordering suffixes when sourcing components, as package options or pin configurations may vary between production batches. Confirm that the external switch requirement aligns with your system design constraints. Ensure compatibility with the target operating temperature range and voltage specifications before finalizing procurement orders to avoid integration issues.

Selection Notes

Select this component when designing systems requiring high-reliability input protection with minimal footprint. The external switch architecture allows flexibility in handling higher currents than internally integrated solutions. Consider the 50ns response speed for applications sensitive to fast transients. Evaluate the adjustable current limit settings against the maximum expected load to ensure optimal protection without nuisance tripping during normal operation peaks.

Part Context

ETEK Microelectronics specializes in high-performance analog integrated circuits, focusing on power management and signal chain solutions. The ET9931 belongs to their power protection series, addressing the need for compact, reliable protection in space-constrained mobile devices. This product line emphasizes integration to replace discrete protection networks, reducing bill-of-materials complexity while enhancing system stability against common power anomalies.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official ETEK Microelectronics resources or authorized distributors for direct cross-reference data. Verify pin-to-pin compatibility and electrical parameter equivalence if considering alternative manufacturers' surge protection ICs for this application.