MAX9718HEBL+TG45

Audio Amplifiers Overview

The MAX9718HEBL+TG45 is a mono audio power amplifier from the MAX9718/MAX9719 family, manufactured by Analog Devices Inc./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 features a bridge-tied load (BTL) architecture, differential inputs for improved noise rejection, and adjustable gain via external resistors. It includes a low-power shutdown mode reducing quiescent current to under 100nA, comprehensive click-and-pop suppression, and thermal protection. The component is housed in a 3x3 UCSP package and operates within an extended temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

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

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify the specific ordering suffixes against official manufacturer documentation to ensure correct package type, temperature rating, and lead-free compliance. Confirm availability status through authorized distributors as supply conditions may vary. Ensure compatibility with existing PCB footprints and thermal management requirements before finalizing procurement decisions.

Audio Amplifiers Selection Notes

Select this component for portable applications requiring high efficiency and minimal external components. The adjustable gain option allows flexibility in system design. Consider the UCSP package size for space-constrained layouts. Verify that the required output power and load impedance align with the device's specifications to ensure optimal performance and reliability.

Audio Amplifiers Part Context

This part belongs to the MAX9718/MAX9719 series of low-cost, mono/stereo, 1.4W differential audio power amplifiers. The MAX9718 variant is designed for mono speaker applications, while the MAX9719 supports stereo systems. Both share similar electrical characteristics and packaging options, differing primarily in channel configuration and pinout.

Audio Amplifiers Replacement Considerations

The MAX9718 is pin-compatible with the LM4895. When considering replacements, verify that the substitute component matches the BTL architecture, supply voltage range, and package dimensions to ensure seamless integration without redesigning the PCB layout.

Audio Amplifiers FAQ

How does the MAX9718 handle shutdown polarity?

The MAX9718 features a SHDM input that controls the polarity of the SHDN pin. Driving SHDM high configures SHDN as active-high, while driving it low configures it as active-low.

What is the purpose of the BIAS capacitor?

The BIAS bypass capacitor improves power-supply rejection ratio (PSRR) and total harmonic distortion plus noise (THD+N) by reducing noise at the common-mode bias node. It also generates the clickless/popless startup DC bias waveform.