LM4941

LM4941, LM4941SDBD, LM4941TMBD www.ti.com SNAS347C – JUNE 2006 – REVISED MAY 2013 LM4941 1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown Check for Samples: LM4941, LM4941SDBD, LM4941TMBD FEATURES 1 2 Improved RF Suppression, By Up to 20dB Over Previous Designs in Selected Applications Fully Differential Amplification Available in Space-Saving DSBGA Package Ultra Low Current Shutdown Mode Can Drive Capacitive Loads up to 100pF Improved Pop & Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions 2.4 - 5.5V Operation No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required APPLICATIONS Mobile Phones PDAs Portable Electronic Devices KEY SPECIFICATIONS Improved 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) DESCRIPTION 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 5VDC power 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 L...