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LM4991 Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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LM4991 Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
1 / 15 page LM4991 3W Audio Power Amplifier with Shutdown Mode General Description The LM4991 is a mono bridged audio power amplifier ca- pable of delivering 3W of continuous average power into a 3 Ω 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 (I SD = 0.1µA, typ) is activated when V DD 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 3 Ω (at 10% THD). The other package options for the LM4991 will deliver 1.5W into 8 Ω (at 10% THD). See the Application Information sections for further information concerning the LM4991LD and LM4991M. Key Specifications n Improved PSRR at 217kHz and 1kHz 64dB (typ) n P O at VDD = 5.0V, 10% THD, 1kHz n LM4991LD (only), 3 Ω,4Ω 3W (typ), 2.5W (typ) n All packages, 8 Ω load 1.5W (typ) n Shutdown current 0.1µA (typ) Features n Available in space-saving LLP and MA packages n Ultra low current shutdown mode n Can drive capacitive loads up to 500pF n Improved pop & click circuitry reduces noises during turn-on and turn-off transitions n 2.2 - 5.5V operation n No output coupling capacitors, snubber networks, bootstrap capacitors or gain-setting resistors required n Unity-gain stable Applications n Wireless and cellular handsets n PDA’s n Portable computers n Desktop computers Connection Diagrams Small Outline Package LLP Package 20074002 Top View Order Number LM4991MA See NS Package Number M08A 20074039 Top View Order Number LM4991LD See NS Package Number LDC08A Boomer® is a registered trademark of National Semiconductor Corporation. May 2003 © 2003 National Semiconductor Corporation DS200740 www.national.com |
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