Catalog
1.25-W, mono, analog input Class-AB audio amplifier
Key Features
• Improved RF Suppression, By Up to 20dB Over Previous Designs in Selected ApplicationsFully Differential AmplificationAvailable in Space-Saving DSBGA PackageUltra Low Current Shutdown ModeCan Drive Capacitive Loads up to 100pFImproved Pop & Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions2.4 - 5.5V OperationNo Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors RequiredKey SpecificationsImproved PSRR at 217Hz 95dB (typ)Power Output, VDD= 5.0V, RL= 8Ω, 1% THD+N 1.25W (typ)Power Output, VDD= 3.0V, RL= 8Ω, 1% THD+N 430mW (typ)Shutdown Current 0.1µA (typ)All trademarks are the property of their respective owners.Improved RF Suppression, By Up to 20dB Over Previous Designs in Selected ApplicationsFully Differential AmplificationAvailable in Space-Saving DSBGA PackageUltra Low Current Shutdown ModeCan Drive Capacitive Loads up to 100pFImproved Pop & Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions2.4 - 5.5V OperationNo Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors RequiredKey SpecificationsImproved PSRR at 217Hz 95dB (typ)Power Output, VDD= 5.0V, RL= 8Ω, 1% THD+N 1.25W (typ)Power Output, VDD= 3.0V, RL= 8Ω, 1% THD+N 430mW (typ)Shutdown Current 0.1µA (typ)All trademarks are the property of their respective owners.
Description
AI
The LM4941 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.25 watts of continuous average power to a 8Ω load with less than 1% distortion (THD+N) from a 5VDCpower supply. The LM4941 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other small form factor applications where minimal PCB space is a primary requirement.
The LM4941 also features proprietary internal circuitry that suppresses the coupling of RF signals into the chip. This is important because certain types of RF signals (such as GSM) can couple into audio amplifiers in such a way that part of the signal is heard through the speaker. The RF suppression circuitry in the LM4941 makes it well-suited for portable applications in which strong RF signals generated by an antenna from or a cellular phone or other portable electronic device may couple audibly into the amplifier.
Other features include a low-power consumption shutdown mode, internal thermal shutdown protection, and advanced pop & click circuitry.
The LM4941 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.25 watts of continuous average power to a 8Ω load with less than 1% distortion (THD+N) from a 5VDCpower supply. The LM4941 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other small form factor applications where minimal PCB space is a primary requirement.
The LM4941 also features proprietary internal circuitry that suppresses the coupling of RF signals into the chip. This is important because certain types of RF signals (such as GSM) can couple into audio amplifiers in such a way that part of the signal is heard through the speaker. The RF suppression circuitry in the LM4941 makes it well-suited for portable applications in which strong RF signals generated by an antenna from or a cellular phone or other portable electronic device may couple audibly into the amplifier.
Other features include a low-power consumption shutdown mode, internal thermal shutdown protection, and advanced pop & click circuitry.
