The LM48520 integrates a boost converter with a high efficiency Class D stereo audio
power amplifier to provide up to 1W/ch continuous power into an 8Ω 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
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
amplifiers. 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 device from damage during fault conditions. Superior click and pop
suppression eliminates audible transients during power-up and shutdown.
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