MAX9718AETB+T

Audio Amplifiers Overview

The MAX9718AETB+T is a mono audio power amplifier from Analog Devices/Maxim Integrated, housed in a 10-pin TDFN package with an exposed pad. It operates on a single supply voltage ranging from 2.7V to 5.5V and delivers 1.4W of continuous average power into a 4Ω load at 1% THD+N. The device features adjustable gain via external resistors, a low-power shutdown mode reducing current to under 1μA, and integrated click-and-pop suppression. It supports bridge-tied load (BTL) architecture for high-quality audio amplification.

Audio Amplifiers Feature Summary

• Bridge-tied load (BTL) architecture eliminates the need for DC-blocking output capacitors.
• Adjustable differential gain configuration allows flexibility in circuit design.
• Integrated industry-leading click-and-pop suppression ensures quiet startup and shutdown.
• Low-power shutdown mode significantly reduces quiescent current consumption.

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify the specific suffix ETB corresponds to the 10-pin TDFN-EP package when sourcing. Confirm RoHS compliance status as indicated by the plus sign in the part number. Ensure the adjustable gain variant matches the system requirements, as fixed-gain versions exist within the same family. Cross-reference the manufacturer's ordering information to validate availability and lead times through authorized distributors.

Audio Amplifiers Selection Notes

Select this component for portable applications requiring high efficiency and minimal external components. The adjustable gain feature suits designs needing precise signal level control. Consider the thermal performance of the TDFN package for heat dissipation in compact enclosures. Verify that the input signal range aligns with the 1.8V logic compatibility if interfacing with digital sources directly.

Audio Amplifiers Part Context

This device belongs to the MAX9718/MAX9719 family of low-cost, mono/stereo audio power amplifiers. The MAX9718 series provides mono amplification, while the MAX9719 offers stereo capabilities. Both share similar electrical characteristics and packaging options, including UCSP, TDFN, and μMAX packages, designed for space-constrained portable electronics.

Audio Amplifiers Replacement Considerations

The MAX9718 is pin-compatible with the LM4895. Designers upgrading from the LM4895 can utilize this component as a direct replacement without modifying the PCB layout, provided the supply voltage and gain settings are compatible with the new specifications.

Audio Amplifiers FAQ

How is the shutdown polarity configured on the MAX9718?

The shutdown polarity is controlled by the SHDM pin. Driving SHDM high configures the SHDN input as active-high, while driving it low configures it as active-low.

What is the purpose of the BIAS pin capacitor?

The BIAS bypass capacitor improves power-supply rejection ratio (PSRR) and total harmonic distortion plus noise (THD+N). It also generates the clickless/popless startup DC bias waveform for the speaker amplifiers.