LM48511

Product Folder Order Now Technical Documents Tools & Software Support & Community LM48511 SNAS416K – JULY 2007 – REVISED NOVEMBER 2019 LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With Spread Spectrum 1 Features 1 3-W Output into 8 Ω at 5 V 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-V to 5.5-V Operation Low shutdown current Click and pop suppression Key specifications – Quiescent power supply current – VDD = 3 V 9 mA (Typical) – VDD = 5 V 13.5 mA (Typical) – PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 Ω, THD+N = 1% 3 W (Typical) – PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 Ω, THD+N = 1% 1 W (Typical) – PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 Ω, THD+N = 1% 5.4 W (Typical) – Shutdown Current at VDD = 3 V, 0.01 μA (Typical) The switching regulator of the LM48511 is a currentmode boost converter operating at a fixed frequency of 1 MHz. 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 5 V, extends battery life when compared to Boosted Class AB amplifiers. Independent regul...