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LM48520TL Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM48520TL Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 18 page  March 20, 2008 LM48520 Boosted Stereo Class D Audio Power Amplifier with Output Speaker Protection and Spread Spectrum General Description The LM48520 integrates a boost converter with a high effi- ciency Class D stereo audio power amplifier to provide up to 1W/ch continuous power into an 8 Ω speaker when operating from 2.7V to 5.0V power supply with boost voltage (PV1) of 5.0V. The LM48520 utilizes a proprietary spread spectrum pulse width modulation technique that lowers RF interference and EMI levels. The Class D amplifier is a low noise, filterless PWM architecture that eliminates the output filter, reducing external component count, board area, power consumption, system cost, and simplifying design. The LM48520 is designed for use in mobile phones and other portable communication devices. The high (78%) efficiency extends battery life when compared to Boosted Class AB am- plifiers. The LM48520 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND). Also, external leakage is minimized via control of the ground reference via the SW- OUT pin . The LM48520 has 4 gain options which are pin selectable via Gain0 and Gain1 pins. Output short circuit prevents the de- vice from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power- up and shutdown. Key Specifications ■ Quiescent Power Supply Current 11.5mA (typ) ■ Output Power (R L = 8Ω, THD+N ≤ 1%, V DD = 3.3V,PV1 = 5.0V) 1.1W (typ) ■ Shutdown Current 0.04μA (typ) Features ■ Click and Pop Suppression ■ Low 0.04μA Shutdown Current ■ 78% Efficiency ■ Filterless Class D ■ 2.7V - 5.0V operation ■ 4 Adjustable Gain settings ■ Adjustable output swing limiter with Soft Clipping ■ Speaker Protection ■ Short circuit protection on Audio Amps ■ Independent Boost and Amplifier shutdown pins Applications ■ Mobile Phones ■ PDAs ■ Portable media ■ Cameras ■ Handheld games Boomer® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation 201987 www.national.com |
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