WM9001GEFL

Overview

The WM9001GEFL is a mono speaker driver manufactured by Wolfson Microelectronics, now part of Cirrus Logic. It supports Class D and Class AB operation modes for system flexibility. The device delivers 1W into an 8Ω load with high power supply rejection ratio (PSRR). It features low leakage current enabling direct battery connection, pop/click suppression, and RF noise suppression. The unit operates within an analogue supply range of 2.7V to 4.5V and a speaker supply range of 2.7V to 5.5V. It utilizes a 3x3mm QFN package suitable for portable electronics.

Feature Summary

• Dual-mode operation supporting both Class D and Class AB configurations
• Ultra-low leakage current allowing direct battery connection without discharge
• Integrated thermal shutdown protection and pop/click suppression mechanisms
• Flexible signal boost options configurable via hardware control pins

Applications

• Mobile phones
• Portable navigation devices
• Laptop computers
• Electronic dictionaries

Procurement Notes

Verify the manufacturer origin as this component was originally produced by Wolfson Microelectronics before its acquisition by Cirrus Logic. Confirm that the specific GEFL suffix corresponds to the standard QFN package variant. Ensure compatibility with existing system clocking schemes if utilizing Class D mode, as the SYNC pin accepts external clocks or enables the internal oscillator.

Selection Notes

Select this component when a compact mono amplifier solution is required for portable devices. Consider Class D mode for higher efficiency or Class AB for simpler implementation without external clocking. Evaluate the SPKVDD voltage requirements against the desired output power and signal boost settings. Ensure PCB layout accommodates the thermal dissipation needs defined by the junction-to-ambient resistance.

Part Context

This device belongs to the Wolfson Microelectronics speaker driver portfolio, designed specifically for integration with their audio CODECs like the WM8991. It serves as a standalone mono amplifier or part of a stereo pair configuration. The technology emphasizes miniaturization through the small QFN footprint while maintaining high audio fidelity and power efficiency standards typical of mobile audio applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.