LM4991

If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales ffice/Distributors for availability and specifications.
Supply Voltage 6.0V
Supply Temperature −65˚C to +150˚C
Input Voltage −0.3V to V_DD to +0.3V
Power Dissipation (Note 4) Internally Limited
ESD Susceptibility (Note 5) 2000V
ESD Susceptibility (Note 6) 200V
Junction Temperature 150˚C
Thermal Resistance
_JC (LD) (Note 9) 4.3˚C/W
_JA (LD) 56˚C/W
_JC (MA) 35˚C/W
_JA (MA)140˚C/W

The LM4991 is a mono bridged audio power amplifier ca-pable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (Note 1). To conserve power in portable appli-cations, the LM4991's micropower shutdown mode (ISD =0.1µA, typ) is activated when VDD is applied to the SHUT-DOWN pin.

Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply volt-ages from 2.2V to 5.5V. Since the LM4991 does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is ideally suited for low-power portable systems that require minimum volume and weight.

Additional LM4991 features include thermal shutdown pro-tection, unity-gain stability, and external gain set.

Note 1: An LM4991LD that has been properly mounted to a circuit board will deliver 3W into 3Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8Ω (at 10% THD). See the Application Information sections for further information concerning the LM4991LD and LM4991M.