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LM4906LDNSN/a605avai1W, Bypass-Capacitor-less Audio Power Amplifier with Internal Selectable Gain
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LM4906LD-LM4906MM-LM4906MMX
1W, Bypass-Capacitor-less Audio Power Amplifier with Internal Selectable Gain
LM4906
1W, Bypass-Capacitor-less Audio Amplifier with Internal
Selectable Gain
General Description

The LM4906isan audio power amplifier primarily designed
for demanding applicationsin mobile phones and other por-
table communication device applications.Itis capableof
delivering 1Wof continuous average powertoan 8Ω BTL
load with less than 1% distortion (THD+N) froma +5V power
supply.
The LM4906is the first National Semiconductor Boomer
Power Amplifier that does not requirean external PSRR
bypass capacitor. The LM4906 also hasan internal select-
able gainof either 6dBor 12dB.In addition,no output
coupling capacitorsor bootstrap capacitors are required
which makes the LM4906 ideally suitedfor cell phone and
other low voltage portable applications.
The LM4906 contains advanced pop and click circuitry that
eliminates noise, which would otherwise occur during
turn-on and turn-off transitions.
Boomer audio power amplifiers were designed specificallyto
provide high quality output power witha minimal amountof
external components. The LM4906 featuresa low -power
consumption shutdown mode (the partis enabledby pulling
theSDpin high). Additionally, the LM4906 featuresan inter-
nal thermal shutdown protection mechanism.
Key Specifications
Improved PSRRat 217Hzfor +3V 71dB Power Outputat +5V, THD+N= 1%,8Ω 1.0W (typ) Power Outputat +3V, THD+N= 1%,8Ω 390mW (typ) Total shutdown power supply current 0.1µA (typ)
Features
Selectable gainof 6dB (2V/V)or 12dB (4V/V) No outputor PSRR bypass capacitors required Improved “Click and Pop” suppression circuitry Very fast turnon time: 5ms (typ) Minimum external components 2.6- 5.5V operation BTL output can drive capacitive loads Ultra low current shutdown mode (SD Low)
Applications
Portable computers Desktop computers Multimedia monitors
Typical Application

200571B9
FIGURE1. Typical Audio Amplifier Application Circuit

January 2005
LM4906
Bypass-Capacitor-less
Audio
Amplifier
with
Internal
Selectable
Gain
ic,good price


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