MAX4298EUB+

Audio Special Purpose Overview

The MAX4298EUB+ is a stereo headphone driver IC designed for single +5V applications in noisy digital environments. It features ultra-high power-supply rejection (115dB DC, 93dB at 20kHz) and Class AB rail-to-rail output drive capability. The device operates on a 4.5V to 5.5V supply with a quiescent current of 10.2mA to 17.5mA. It delivers 1.5VRMS into 10kΩ with 0.0008% THD+N and drives 32Ω loads to 1.2VRMS with 0.02% distortion. The unity-gain bandwidth is 1.3MHz, and it supports capacitive loads up to 22nF. Packaged in a 10-pin µMAX, it includes clickless/popless mute and power sequencing.

Audio Special Purpose Feature Summary

• Ultra-High PSRR: 115dB DC and 93dB at 20kHz for operation from noisy digital supplies
• High-Current Drive: Capable of driving 32Ω headphones to 1.2VRMS with 0.02% THD+N
• Clickless/Popless Operation: Features popless power-up/down and mute/unmute sequences
• PC99 Compliance: Meets standards for better than 1VRMS output into 16Ω loads

Audio Special Purpose Applications

• Notebook and Desktop Audio Systems
• Hands-Free Headsets
• USB Audio Peripherals
• IP Telephones
• MP3 Players/Recorders

Audio Special Purpose Procurement Notes

Verify the package type matches the 10-pin µMAX specification. Confirm the operating temperature range is -40°C to +85°C. Ensure the design accommodates the required bypass capacitors (1µF on BIAS/CBYPASS, 0.1µF on VCC) for optimal performance and stability as defined in the datasheet.

Audio Special Purpose Selection Notes

Select the MAX4298EUB+ when only the stereo headphone driver functionality is required without the microphone amplifier or linear regulator found in the MAX4299 variant. It is suitable for space-constrained designs requiring high PSRR to reject digital noise from the +5V supply line.

Audio Special Purpose Part Context

The MAX4298EUB+ belongs to the MAX4298/MAX4299 family of audio system ICs. While the MAX4299 integrates a microphone amplifier and a 100mA linear regulator, the MAX4298 provides only the stereo headphone driver. Both share the same core architecture for high PSRR and are available in various packages, with the EUB+ suffix denoting the 10-pin µMAX version.

Audio Special Purpose Replacement Considerations

The MAX4298ESD is a pin-compatible alternative in a 14-pin SO package. For systems requiring additional integrated functions like a microphone amp or regulator, the MAX4299 series serves as the functional expansion counterpart.