Features: Fast0.1ms (typ) and 1.0ms (max) turn-onand turn-off time
Eliminates Ea mplifier output coupling capacitors
Advanced "click and pop" suppression circuitry
Stereo headphone amplifier mode
Low-power standby and ultra-low current micropower shutdown modes
Thermal shutdown protection circuitry
2.4V to 5.5V operation
Unity-gain stable
Gain set with external resistors
Space-saving micro SMD package,exposed-DAP LLP, and TSSOPApplicationPDAs
Notebook computers
Cellular phones
Handheld portable electronic devicesSpecifications
| Power@ 4Ohms, 1% THD |
1.7 Watt |
| Power@ 8Ohms, 1% THD |
1.1 Watt |
| Power@ 4Ohms, 10% THD |
2.1 Watt |
| Power@ 8Ohms, 10% THD |
1.3 Watt |
| THD |
0.08 % |
| PSRR |
63 dB |
| SNR |
90 dB |
| Channels |
2 Channels |
| Supply Range |
+2.4 - +5.5 V |
| THD Conditions |
Pout=.05W @ Vs=5V, R= 8 Ohms |
| PSRR Conditions |
1 kHz |
| SNR Conditions |
Pout=900mW, RL=8 Ohms |
| User Supply |
5 Volt |
| Shutdown Type |
Low |
| Temperature Min |
-40 deg C |
| Temperature Max |
85 deg C |
| View Using Catalog |
Description
The unity-gain stable LM4854 is both a mono differentia output (for bridge-tied loads,or BTL) audio power amplifier and a single-ended (SE) stereo head phone amplifier.Oper-ating on asingle 5V supply,the mono BTL mode delivers 1.1W(typ) to an8 load,1.7W( typ) to a4 load (Note1) at 1% THD+N. In SE stereo mode, the amplifier will deliver 85mW to32 loads.The LM4854 features a new circuittopology that suppresses output transients('click and pops') and eliminates SE-mode output coupling capacitors,saving both component and board space costs.The LM4854 has three inputs:one pairfor a two-channel stereo signal and the third for asingle-channel mono input.
The LM4854 is designed for PDA,cellular telephone,note-book,and other handheld portable applications.It delivers high quality output power from a surface-mount package and requires few external components.Otherfeatures include an active-low micropower shutdown power standby mode,and thermal shutdown protection.
The LM4854 is available in the very space-efficient 12-lead micro SMD,exposed-DAP LLP for higher power applica-tions, and TSSOP packages.
LM4854 Data Sheet
