LM48310 - Ultra-Low EMI, Filterless, 2.6W, Mono, Class D Audio Power Amplifier with E2S

The LM48310 is a single supply, high efficiency, mono, 2.6W, filterless switching audio amplifier. The LM48310 features TI’s Enhanced Emissions Suppression (E²S) system, that features a unique patent-pending ultra low EMI, spread spectrum, PWM architecture, that significantly reduces RF emissions while preserving audio quality and efficiency. The E²S system improves battery life, reduces external component count, board area consumption, system cost, and simplifying design.

The LM48310 is designed to meet the demands of portable multimedia devices. Operating from a single 5V supply, the device is capable of delivering 2.6W of continuous output power to a 4Ω load with less than 10% THD+N. Flexible power supply requirements allow operation from 2.4V to 5.5V. The LM48310 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI suppressing spread spectrum mode. The E²S system includes an advanced, patent-pending edge rate control (ERC) architecture that further reduce emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency (η = 88%). The LM48310 also features a SYNC_IN input and SYNC_OUT, which allows multiple devices to operate with the same switching frequency, eliminating beat frequencies and any other interference caused by clock intermodulation.

The LM48310 features high efficiency compared to conventional Class AB amplifiers, and other low EMI Class D amplifiers. When driving and 8Ω speaker from a 5V supply, the device operates with 88% efficiency at P_O = 1W. The gain of the LM48310 is internally set to 12dB, further reducing external component count. A low power shutdown mode reduces supply current consumption to 0.01μA.

Advanced output short circuit protection with auto-recovery prevents the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.

Products containing the "LM48310" keyword are: LM48310SD , LM48310SD NOPB , LM48310SD/NOPB , LM48310SD/NOPB , LM48310SDBD , LM48310SDBD/NOPB , LM48310SDX , LM48310SDX/NOPB , LM48310SDX/NOPB

• Passes FCC Class B Radiated Emissions with 20 inches of cable
• E²S System Reduces EMI while Preserving Audio Quality and Efficiency
• Output Short Circuit Protection with Auto-Recovery
• Stereo Class D Operation
• No Output Filter Required
• Internally Configured Gain (12dB)
• Synchronizable Oscillator for Multi-Channel Operation
• Low Power Shutdown Mode
• Minimum External Components
• "Click and Pop" Suppression
• Micro-Power Shutdown
• Available in Space-Saving WSON Package

Key Specifications

• Efficiency at 3.6V, 400mW into 8Ω 85% (typ)
• Efficiency at 5V, 1W into 8Ω 88% (typ)
• Quiescent Power Supply Current at 5V 3.2mA
• Power Output at V_DD = 5V, R_L = 4Ω, THD+N ≤ 10% 2.6W (typ)
• Power Output at V_DD = 5V, R_L = 8Ω, THD+N ≤ 10% 1.6W (typ)
• Shutdown Current 0.01μA (typ)

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