LM4881MMX/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Class AB
Output Type:	Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load:	300mW x 2 @ 8 Ohm
Voltage - Supply:	2.7 V ~ 5.5 V
Features:	Shutdown, Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Base Part Number:	LM4881

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LM4881MM/NOPB Application Field and Working Principle

The LM4881MM/NOPB is a single-ended, charge pump-powered, audio power amplifier from Texas Instruments. It is mainly used for low-power audio headphone and other small audio output applications. This device is suitable for 7V-15V operating supplies and has a wide power bandwidth of 4kHz for superior audio performance. In addition, the gain is internally set at 20dB and can be programmed to 4 different gains by changing a single external component. It also features low quiescent current and high power efficiency, making it suitable for battery-powered applications.The working principle of the LM4881MM/NOPB is based on a voltage conversion architecture which allows it to efficiently deliver over 200mW of power into 32 ohm headphones. It uses two internal high-efficiency step-up voltage converters to convert the battery supply voltage into the required amplifier rails of up to 18V. This allows it to output high-voltage and high-current signals needed for demanding headphone applications.The device also features temperature shutdown and overcurrent protection features which prevents them from being damaged if an output load is shorted or if the device gets too hot. The total harmonic distortion (THD) of the LM4881MM/NOPB is extremely low at 0.02% for 32 ohm headphone loads, which ensures excellent audio quality. Finally, the device is available in 8-pin TSSOP, 8-pin SOIC, and 8-pin DIP packages which makes it suitable for different design requirements.In summary, the LM4881MM/NOPB from Texas Instruments is an ideal solution for low-power audio headphone applications, which allows for superior audio performance with low quiescent current and high power efficiency. It features two internal high-efficiency step-up voltage converters, low noise, temperature shutdown and overcurrent protection features, and THD of 0.02%. The available packages make it perfect for various design requirements.

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