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LM4802B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4802B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 17 page  LM4802B Audio Power Amplifier with Boost Converter to Drive Ceramic Speakers General Description The LM4802B integrates a Boost Converter with an Audio Power Amplifier to drive Ceramic Speakers in portable ap- plications. When powered by a 3V supply, it is capable of forcing 12Vp-p 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 LM4802B does not require boot- strap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4802B features a low-power consumption shutdown mode. Additionally, the LM4802B features an internal ther- mal shutdown protection mechanism. The LM4802B contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4802B is unity-gain stable. Its gain is set by external resistors. Key Specifications j Quiescent Power Supply Current 12mA (typ) j BTL Voltage Swing (2µF + 30 Ω load, 1% THD+N, V DD = 3V) 12Vp-p (typ) j Shutdown Current 2µA (max) Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 2µA (max) shutdown current n Low, 12mA (typ) quiescent current n 12Vp-p mono BTL output, load = 2µF + 30 Ω,V DD =3V n Short circuit protection n Unity-gain stable n External gain configuration capability Applications n Cellphone n PDA Connection Diagram LM4802BLQ (5x5) 20094184 Top View Order Number LM4802BLQ See NS Package Number 2LQAQ028 Boomer® is a registered trademark of National Semiconductor Corporation. November 2004 © 2004 National Semiconductor Corporation DS200941 www.national.com |
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