LM4901

LM4901 www.ti.com SNAS139F – DECEMBER 2001 – REVISED DECEMBER 2001 LM4901 1.6 Watt Audio Power Amplifier with Selectable Shutdown Logic Level Check for Samples: LM4901 FEATURES 1 2 Available in Space-Saving Packages: WSON and VSSOP Ultra Low Current Shutdown Mode BTL Output can Drive Capacitive Loads Improved Pop & Click Circuitry Eliminates Noise During Turn-On and Turn-Off Transitions 2.0 - 5.5V Operation No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required Unity-Gain Stable External Gain Configuration Capability User Selectable Shutdown High or Low logic Level APPLICATIONS Mobile Phones PDAs Portable Electronic Devices KEY SPECIFICATIONS Improved PSRR at 217Hz & 1KHz 62 dB Power Output at 5.0V, 1% THD, 4Ω 1.6 W (typ) Power Output at 5.0V, 1% THD, 8Ω 1.07 W (typ) Power Output at 3.0V, 1% THD, 4Ω 525 mW (typ) Power Output at 3.0V, 1% THD, 8Ω 390 mW (typ) Shutdown Current 0.1μA (typ) DESCRIPTION The LM4901 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load and 1.6 watts of continuous avearge power to a 4Ω BTL load with less than 1% distortion (THD+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4901 does not req...