Class D Amplifiers

LPA2104A-Class D Amplifiers
2.5-5.5Input Voltage(V):
Class DClass:
3W,5V@4Ω,10%,Differential inputOutput Power(W):
1Output Channel:
XGain Control:
XShort Circuit Protection:
0.2Terminal Current(uA):

3Walts Mono Filter-free Class-D Audio Power Amplifier

General Description

The LPA2104A is a high efficiency, 3.0W mono class-D audio power amplifier. A new developed filterless PWM modulation architecture further reduces EMI and THD+N, as well as eliminates the LC output filter, reducing external component count, sys cost, and simplifying design. Operating in a single 5V supply, LPA2104A is capable of driving 4Ω speaker load at a continuous average output of 3W/10% THD+N or 2.3W/1% THD+N. The LPA2104A has high efficiency with speaker load compared to a typical class D amplifier. With a 3.6V supply driving an 8Ω speaker , the efficiency for a 400mW power level is 90%.In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the LPA2104A. The gain of LPA2104A is externally configurable which allows independent gain control from multiple sources by summing signals from separate sources. The LPA2104A is available in space-saving SOP8 Packaging packages.


PMP,PSP, Game, Data-Bank
Cellular and Smart mobile phone



Unique Modulation Scheme Reduces EMI Emissions
Efficiency at 3.6V With an 8-Ω Speaker:
     − 90% at 400 mW
     − 82% at 100 mW
Low 2.5mA Quiescent Current
0.5μA Shutdown Current
2.5V to 5.5V Wide Supply Voltage
Shutdown Pin has 1.4V Compatible Thresholds
Optimized PWM Output Stage Eliminates LC Output Filter
Improved PSRR (−80 dB) Eliminates Need for a Voltage Regulator
Fully Differential Design Reduces RF Rectification
and Eliminates Bypass Capacitor
Improved CMRR Eliminates Two Input Coupling Capacitors
Internally Generated 550kHz Switching Frequency
Integrated Pop and Click Suppression Circuitry
SOP8 Packaging
RoHS compliant and 100% lead(Pb)-free

Marking Information

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