MAX4298ESD+T

Audio Special Purpose Overview

The MAX4298ESD+T is a stereo headphone driver IC designed for single +5V applications in harsh digital environments. It features ultra-high power-supply rejection (115dB DC, 93dB at 20kHz) and 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 14-pin SOIC, 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 rail-to-rail output drive capable of driving 22nF capacitive loads
• Clickless/popless power-up, power-down, and mute functions
• PC99-compliant output drivers with low distortion (0.0008% THD+N into 10kΩ)

Audio Special Purpose Applications

• Notebook and desktop audio systems
• Hands-free headsets
• USB audio peripherals
• IP telephones

Audio Special Purpose Procurement Notes

Verify the package type matches the 'ESD' suffix, which indicates a 14-pin SOIC. Confirm the '+T' designation corresponds to tape-and-reel packaging if required by assembly equipment. Ensure the component grade meets the -40°C to +85°C operating temperature range specified for this part number.

Audio Special Purpose Selection Notes

Select the MAX4298ESD+T when only the stereo headphone driver functionality is needed without the microphone amplifier or linear regulator found in the MAX4299 variant. This part is suitable for space-constrained designs requiring a 14-pin SOIC footprint. Verify that the application does not require an integrated LDO, as this specific model lacks that feature.

Audio Special Purpose Part Context

This component 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 identical driver performance characteristics but differ in pin count and available auxiliary functions.

Audio Special Purpose Replacement Considerations

The MAX4298EUB+ serves as a direct functional replacement in a 10-pin µMAX package. Designers must account for the pinout differences and thermal dissipation changes when switching between the 14-pin SOIC and 10-pin µMAX packages.

Audio Special Purpose FAQ

Does the MAX4298ESD+T include a linear regulator?

No, the MAX4298 variant contains only the stereo headphone driver. The linear regulator is exclusive to the MAX4299.

What is the maximum capacitive load the driver can support?

The output amplifiers are designed to drive highly capacitive loads up to 22nF.

How is the clickless/popless power-down sequence achieved?

It requires connecting SVCC to a standby +5V source or using a reservoir capacitor (minimum 220µF) with a Schottky diode to VCC.