LM4804

LM4804 www.ti.com SNAS268C – MARCH 2005 – REVISED APRIL 2013 LM4804 Boomer™ Audio Power Amplifier SerieLow Voltage High Power Audio Power Amplifier Check for Samples: LM4804 FEATURES 1 23 Pop & Click Circuitry Eliminates Noise During Turn-On and Turn-Off Transitions Low, 2μA (Max) Shutdown Current Low, 11mA (Typ) Quiescent Current (VDD = 4.2V, RL = 8Ω) 1.8W Mono BTL Output, RL = 8Ω, VDD = 3V Short Circuit Protection Unity-Gain Stable External Gain Configuration Capability APPLICATIONS Cellphone PDA KEY SPECIFICATIONS Quiescent Power Supply Current (VDD = 4.2V, RL = 8Ω), 11mA (Typ) BTL Output Power (RL = 8Ω, 2% THD+N, VDD = 3V), 1.8W (Typ) Shutdown Current, 2µA (Max) DESCRIPTION The LM4804 integrates a Boost Converter with an Audio Power Amplifier to drive voice coil speakers in portable applications. When powered by a 3V supply, it is capable of creating 1.8W power dissipation in an 8Ω bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4804 does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4804 features a micro-power shutdown mode. Additionally, the LM4804 features an internal thermal shutdown protection mechanism. The LM4804 contains advanced pop & click circuitry that eliminates output t...