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LM4953SD Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM4953SD Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM4953 Ground-Referenced, Ultra Low Noise, Ceramic Speaker Driver General Description The LM4953 is an audio power amplifier designed for driving Ceramic Speaker in portable applications. When powered by a 3.6V supply, it is capable of forcing 12.6Vpp across a 2µF +30 Ω bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4953 does not require boot- strap capacitors, or snubber circuits. Therefore it is ideally suited for display applications requiring high power and mini- mal size. The LM4953 features a low-power consumption shutdown mode. Additionally, the LM4953 features an internal thermal shutdown protection mechanism. The LM4953 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4953 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Quiescent Power Supply Current (Vdd = 3V) 7mA(typ) j BTL Voltage Swing (2µF+30 Ω load, 1% THD+N, V dd = 3.6V) 12.6V pp (typ) j Shutdown Current 1µA (max) Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 1µA (max) shutdown current n Low, 7mA (typ) quiescent current n 12.6Vpp mono BTL output, load = 2µF+ 30 Ω n Thermal shutdown n Unity-gain stable n External gain configuration capability Applications n Cellphone n PDA Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20142168 FIGURE 1. Typical Application Circuit September 2005 © 2005 National Semiconductor Corporation DS201421 www.national.com |
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