LPA2104 Datasheet, PDF (1/11 Pages) Lowpower Semiconductor inc – Unique Modulation Scheme Reduces EMI Emissions

Preliminary Datasheet LPA2104
3Walts Mono Filter-free Class-D Audio Power Amplifier
General Description
The LPA2104 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, LPA2104 is capable of
driving 4Ω speaker load at a continuous average output of
3.05W/10% THD+N or 2.6W/1% THD+N. The LPA2104
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 LPA2104. The gain of
LPA2104 is externally configurable which allows
independent gain control from multiple sources by
summing signals from separate sources.
The LPA2104 is available in space-saving SOP8 and
MSOP8 Packaging packages.
Order Information
LPA2104 □ □ □
F: Pb-Free
Package Type
SO: SOP8
MS: MSOP8
Applications
— PMP,PSP, Game, Data-Bank
— Cellular and Smart mobile phone
— PDA/DSC
Features
— 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 6V Wide Supply Voltage
— Shutdown Pin has 1.8V 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 750kHz Switching Frequency
— Integrated Pop and Click Suppression Circuitry
— SOP8 and MSOP8 Packaging
— RoHS compliant and 100% lead(Pb)-free
Typical Application Circuit
LPA2104
Marking Information
Please see website:
www.lowpowersemi.com/LPA2104
LPA2104–00 Version 1.0 Datasheet Sep.-2012
www.lowpowersemi.com
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