MAX9750BETI+

Series:	DirectDrive®
Packaging:	Tube
Part Status:	Obsolete
Type:	Class AB
Output Type:	2-Channel (Stereo) with Stereo Headphones
Max Output Power x Channels @ Load:	2.6W x 2 @ 3 Ohm; 110mW x 2 @ 16 Ohm
Voltage - Supply:	4.5 V ~ 5.5 V
Features:	Depop, Short-Circuit and Thermal Protection, Shutdown, Volume Control
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	28-TQFN (5x5)
Package / Case:	28-WFQFN Exposed Pad
Base Part Number:	MAX9750

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Introduction
The MAX9750BETI+ is a high-current, low-voltage audio amplifier from Maxim Integrated. It is an improved version of the MAX9750BETI, which is a single-chip, pulse-width modulated (PWM) audio amplifier. As such, it is capable of providing a high-quality audio solution that meets the needs of both speaker-level and headphone-level applications. The MAX9750BETI+ combines power efficiency, low THD+N, good linearity, and low EMI with the reliability of a single-chip design.
Application Field
The MAX9750BETI+ is specifically designed to drive low-impedance headphones and earphones. Its low-voltage operation allows it to be used in applications where a large power supply or a step-up converter is not available, such as mobile phones and other portable devices. The MAX9750BETI+ supports both single-ended and bridge-tied load (BTL) configurations, making it compatible with a wide range of speaker configurations. The MAX9750BETI+ also features low EMI and a slew rate of 8V/µs, making it suitable for a variety of applications, including audio playback, speech recognition, and hearing aids.
Working Principle
The MAX9750BETI+ consists of two distinct amplifiers, an input amplifier and a Class-AB power output that is driven by a pulse-width modulation (PWM) modulator. The input amplifier is a unity-gain, DC-coupled differential amplifier capable of driving a wide range of headphone impedances. The power output is a Class-AB amplifier capable of driving up to 36V peak/50W peak into a 4Ω load. The PWM modulator converts the input signal into a pulse-width modulated signal. The PWM modulator is also responsible for setting the gain of the power output amplifier. The MAX9750BETI+ implements a lossless architecture to minimize power dissipation in the audio path and to optimize the signal-to-noise ratio. The PWM modulator also features slew-rate control and over-current protection, which allows the amplifier to provide a high output without sacrificing audio quality.
Conclusion
The MAX9750BETI+ is a high-current, low-voltage audio amplifier that is designed to meet the needs of both speaker-level and headphone-level applications. It features low THD+N, low EMI, good linearity, and slew-rate control. It is capable of driving up to 36V peak/50W peak into a 4Ω load and is compatible with a wide range of headphone impedances. The MAX9750BETI+ is highly reliable and power efficient and is ideal for audio playback, speech recognition, and hearing aids.

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