Class AB Amplifiers

LPA4871-Class AB Amplifiers
2.5-5.5Input Voltage(V):
Class ABClass:
2.9W,5V@4Ω,10%Output Power(W):
1Output Channel:
XGain Control:
XShort Circuit Protection:
0.1Terminal Current(uA):

2.1-Walts Mono Filter-free Audio Power Amplifier

General Description

The LPA4871 is an audio power amplifier designed for portable communication device applications such as mobile phone applications. The LPA4871 is capable of delivering 2.1W of continuous average power to an 8Ω BTL and with less than 1% distortion (THD+N) from a 5.0V power supply, and 650mW to a 8Ω BTL load from a 3V power supply. The LPA4871 provides high quality audio while requiring few external components and minimal power consumption. It features a low-power shutdown mode, which is achieved by driving the SHUTDOWN pin with logic low. The LPA4871 contains circuitry to prevent from ”pop and click” noise that would otherwise occur during turn-on and turn-off transitions. For maximum flexibility, the LPA4871 provides an externally controlled gain (with resistors), as well as an externally controlled turn-on and turn-off times (with the bypass capacitor). The LPA4871 is available in a SOP8 package.


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



2.5-5.5V operation
65dB PSRR at 217Hz, VDD=5V
0.1μA ultra low current shutdown mode
Improved pop & click circuitry
Unique Modulation Scheme Reduces EMI Emissions
0.1-μA Shutdown Current
No output coupling capacitors, sunbber networks or
bootstrap capacitors required
External gain configuration capability
Shutdown Pin has 1.8V Compatible Thresholds
BTL output can drive capacitive loads
RoHS compliant and 100% lead(Pb)-free

Marking Information

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