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LM4854LD-LM4854MT-LM4854MTX
1.9W Monaural, 85mW Stereo Headphone Audio Amplifier
LM4854
1.9W Monaural, 85mW Stereo Headphone Audio
Amplifier
General DescriptionThe unity-gain stable LM4854is botha mono differential
output (for bridge-tied loads,or BTL) audio power amplifier
anda single-ended (SE) stereo headphone amplifier. Oper-
atingona single5V supply, the mono BTL mode delivers
1.1W (typ)toan8Ω load, 1.7W (typ)toa4Ω load (Note1)at THD+N.In SE stereo mode, the amplifier will deliver
85mWto 32Ω loads. The LM4854 featuresa new circuit
topology 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 pairfora two-channel stereo signal andthe
thirdfora single-channel mono input.
The LM4854is designedfor PDA, cellular telephone, note-
book, and other handheld portable applications.It delivers
high quality output power froma surface-mount package and
requires few external components. Other features includean
active-low micropower shutdown mode,an "instant-on" low
power standby mode, and thermal shutdown protection.
The LM4854is availableinthe very space-efficient 12-lead
micro SMD, exposed-DAP LLPfor higher power applica-
tions, and TSSOP packages.
Note1:An LM4854LDthat hasbeen properlymountedtoa circuit boardwill
deliver 1.7W (typ)intoa4Ω load.
Key Specifications LLP BTL output power (RL= 3.2Ω and
THD+N= 1%)
VDD= 3.0V 1.0W (typ)
VDD= 5.0V 1.9W (typ) LLP BTL output power (RL =4Ω and
THD+N= 1%)
VDD= 3.0V 900mW (typ)
VDD= 5.0V 1.7W (typ) LLP BTL output power (RL =8Ω and
THD+N= 1%)
VDD= 3.0V 380mW (typ)
VDD= 5.0V 1.1W (typ)SE output power (RL =32Ω and THD+N 1.0%)
VDD= 3.0V 32mW (typ)
VDD= 5.0V 93mW (typ) Micropower shutdown supply current
VDD= 3.0V 0.005µA (typ)
VDD= 5.0V 0.05µA (typ) Standby supply current
VDD= 3.0V 16µA (typ)
VDD= 5.0V 27µA (typ) PSRR(f= 1kHz, 3.0V≤ VDD≤ 5.0V,
(Fig.1))
BTL 60dB (typ) 66dB (typ)
Features Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off
time EliminatesSE amplifier 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 2.4Vto 5.5V operation Unity-gain stable Gainset with external resistors Space-saving micro SMD package, exposed-DAP LLP,
and TSSOP
Applications PDAs Notebook computers Cellular phones Handheld portable electronic devices
April 2003
LM4854
1.9W
Monaural,
85mW
Stereo
Headphone
Audio
Amplifier
