LM48820

LM48820 www.ti.com SNAS370B – MAY 2007 – REVISED MAY 2013 LM48820 Ground-Referenced, Ultra Low Noise, Fixed Gain, 95mW Stereo Headphone Amplifier Check for Samples: LM48820 FEATURES 1 2 Available in Space Saving 0.4mm Pitch DSBGA Package Fixed Logic Levels Ground Referenced Outputs High PSRR Ultra Low Current Shutdown Mode Improved Pop and Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions No Output Coupling Capacitors, Snubber Networks, Bootstrap Capacitors, or GainSetting Resistors Required Shutdown Either Channel Independently Soft Start Feature Reduces Start up Transient Current APPLICATIONS Mobile Phones MP3 Players PDAs Portable electronic devices Notebook PCs KEY SPECIFICATIONS Improved PSRR at 217Hz: 80dB (typ) Power Output at VDD = 3V, RL = 16Ω, THD+N = 1%: 95mW (typ) Shutdown Current: 0.05μA (typ) Internal Fixed Gain: 1.5V/V (typ) Wide Operating Voltage Range: 1.6V to 4.5V DESCRIPTION The LM48820 is a ground referenced, fixed-gain audio power amplifier capable of delivering 95mW of continuous average power into a 16Ω single-ended load, with less than 1% THD+N from a 3V power supply. The LM48820 features a new circuit technology that utilizes a charge pump to generate a negative reference voltage. This allows the outputs to be biased about ground, thereby eliminating outputcoupling capacitors typically used with normal singleended loads. Boomer audio power amplifiers were designed specifically to provi...