MAX9718BETB+T

Audio Amplifiers Overview

The MAX9718BETB+T is a mono-channel, low-cost audio power amplifier manufactured by Analog Devices (Maxim Integrated). It operates on a single supply voltage ranging from 2.7V to 5.5V and delivers 1.4W of continuous average power per channel into a 4Ω load with less than 1% THD+N. The device utilizes a bridge-tied load (BTL) architecture and features differential inputs for improved noise rejection. It includes an internal fixed gain of 0dB and offers a low-power shutdown mode that reduces quiescent current to less than 100nA. The component is housed in a 10-pin TDFN package with an exposed pad and operates within a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Bridge-tied load (BTL) architecture minimizes external component count while providing high-quality audio amplification.
• Differential input structure improves noise rejection and provides common-mode rejection capabilities.
• Integrated click-and-pop suppression circuitry reduces audible artifacts during startup and shutdown sequences.
• Low-power shutdown mode disables bias generators and amplifiers to minimize quiescent current consumption.

Audio Amplifiers Applications

• Mobile phones
• Personal digital assistants (PDAs)
• Portable audio devices

Audio Amplifiers Procurement Notes

Verify the specific suffix ETB confirms the 10-pin TDFN-EP package configuration. Ensure the ordering code matches the required fixed gain variant. Confirm RoHS compliance status as indicated by the plus sign in the part number. Validate thermal management requirements for the TDFN package based on expected power dissipation levels in the target application environment.

Audio Amplifiers Selection Notes

Select this component for applications requiring a single-channel amplifier with differential inputs. The fixed 0dB gain configuration simplifies design by eliminating external gain-setting resistors. Consider the BTL topology for higher output power compared to single-ended configurations. Evaluate the shutdown functionality if battery life optimization is a priority for the portable device design.

Audio Amplifiers Part Context

This part belongs to the MAX9718/MAX9719 family of low-cost, mono/stereo audio power amplifiers. The MAX9718 series specifically denotes single-channel (mono) variants, whereas the MAX9719 series indicates dual-channel (stereo) versions. Both families share similar electrical characteristics and packaging options, differing primarily in channel count and pinout configurations.

Audio Amplifiers Replacement Considerations

The datasheet notes that the MAX9718 is pin-compatible with the LM4895. Designers may consider this alternative for direct replacement scenarios where pin-to-pin compatibility is required without modifying the printed circuit board layout.