SNAS164C – JUNE 2002 – REVISED MAY 2013
Integrated Audio Amplifier System
Check for Samples: LM4855
•2 1.1W (Typ) Output Power with 8Ω Mono BTL
• 115mW (Typ) Output Power with Stereo 32Ω
• SPI Programmable 32 Step Digital Volume
• Eight Distinct Output Modes
• DSBGA and WQFN Surface Mount Packaging
• "Click and Pop" Suppression Circuitry
• Thermal Shutdown Protection
• Low Shutdown Current (0.1uA, Typ)
• THD+N at 1kHz, 1.1W into 8Ω BTL: 1.0% (Typ)
• THD+N at 1kHz, 115mW into 32Ω BTL: 0.5%
• Single Supply Operation: 2.6 to 5.0V
The LM4855 is an audio power amplifier system
capable of delivering 1.1W (typ) of continuous
average power into a mono 8Ω bridged-tied load
(BTL) with 1% THD+N and 115mW (typ) per channel
of continuous average power into stereo 32Ω BTL
loads with 0.5% THD+N, using a 5V power supply.
The LM4855 features a 32 step digital volume control
and eight distinct output modes. The digital volume
control and output modes are programmed through a
three-wire SPI serial control interface, that allows
flexibility in routing and mixing audio channels.
The LM4855 is designed for cellular phone, PDA, and
other portable handheld applications. It delivers high
quality output power from a surface-mount package
and requires only six external components.
The industry leading DSBGA package only utilizes
2mm x 2.3mm of PCB space, making the LM4855 the
most space efficient audio sub system available
• Moblie Phones
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