LM4890MX

LM4890 www.ti.com SNAS138L – SEPTEMBER 2001 – REVISED MAY 2013 LM4890 1 Watt Audio Power Amplifier Check for Samples: LM4890 FEATURES 1 2 Available in Space-Saving Packages: DSBGA, VSSOP, SOIC, and WSON Ultra Low Current Shutdown Mode BTL Output Can Drive Capacitive Loads Improved Pop & Click Circuitry Eliminates Noises During Turn-On and Turn-Off Transitions 2.2 - 5.5V Operation No Output Coupling Capacitors, Snubber Networks or Bootstrap Capacitors Required Thermal Shutdown Protection Unity-Gain Stable External Gain Configuration Capability APPLICATIONS Mobile Phones PDAs Portable Electronic Devices KEY SPECIFICATIONS PSRR at 217Hz, VDD = 5V (Fig. 1): 62dB(typ.) Power Output at 5.0V & 1% THD: 1W(typ.) Power Output at 3.3V & 1% THD: 400mW(typ.) Shutdown Current: 0.1μA(typ.) DESCRIPTION The LM4890 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 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 LM4890 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The...