Features • 3W Output into 8Ω at 5V with THD+N = 1% • Selectable spread spectrum mode reduces EMI • 80% Efficiency • Independent Regulator and Amplifier Shutdown Controls • Dynamically Selectable Regulator Output Voltages • Filterless Class D • 3.0V – 5.5V operation • Low Shutdown Current • Click and Pop Suppression Description The LM48511 integrates a boost converter with a high efficiency Class D audio power amplifier to provide 3W continuous power into an 8Ω speaker when operating from a 5V power supply. When operating from a 3V to 4V power supply, the LM48511 can be configured to drive 1 to 2.5W into an 8Ω load with less than 1% distortion (THD+N). The Class D amplifier features a low noise PWM architecture that eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design. A selectable spread spectrum modulation scheme suppresses RF emissions, further reducing the need for output filters. The LM48511’s switching regulator is a current-mode boost converter operating at a fixed frequency of 1MHz. Two selectable feedback networks allow the LM48511 regulator to dynamically switch between two different output voltages, improving efficiency by optimizing the amplifier’s supply voltage based on battery voltage and output power requirements. The LM48511 is designed for use in portable devices, such as GPS, mobile phones, and MP3 players. The high, 80% efficiency at 5V, extends battery life when compared to Boosted Class AB amplifiers. Independent regulator and amplifier shutdown controls optimize power savings by disabling the regulator when high output power is not required. The gain of the LM48511 is set by external resistors, which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions. Superior click and pop suppression eliminates audible transients during power-up and shutdown. Key Specification ■  Quiescent Power Supply Current     VDD = 3V   VDD = 5V 9mA (typ) 13.5mA (typ) ■  PO at VDD = 5V, PV1 = 7.8V   RL = 8Ω, THD+N = 1% 3.0W (typ) ■  PO at VDD = 3V, PV1 = 4.8V   RL = 8Ω, THD+N = 1% 1W (typ) ■  PO at VDD = 5V, PV1 = 7.8V   RL = 4Ω, THD+N = 1% 5.4W (typ) ■  Shutdown Current at VDD = 3V 0.01μA (typ) Applications • GPS • Portable media • Cameras • Mobile Phones • Handheld games

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Datasheet

Title		Size	Date	Other Language
	LM48511 3W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier with Spread Spectrum	445 Kbytes	25-Feb-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1922: Application Note 1922 LM48511 Evaluation Board User`s Guide	1586 Kbytes	5-Nov-08
	AN-1737: Application Note 1737 Managing EMI in Class D Audio Applications	183 Kbytes	2-Nov-07	日本語 中文

More Application Notes

Title		Size	Date	Other Language
	AN-1614: Application Note 1614 LM48510 Speaker Application Note	214 Kbytes	14-Aug-07	中文