LM4666 - Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Knowledge Base

Features
No output filter required for inductive transducers
Selectable gain of 6dB or 12dB
Very fast turn on time: 6ms (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Short circuit protection
Available in space-saving SDA package

Key Specification


Efficiency at 3V, 100mW into 8 transducer 79% (typ)
Efficiency at 3V, 450mW into 8 transducer 84% (typ)
Efficiency at 5V, 1W into 8 transducer 85% (typ)
Total quiescent power supply current7.0mA (typ)
Total shutdown power supply current0.02µA (typ)
Single supply range2.8V to 5.5V

General Description


The LM4666 is a fully integrated single-supply high efficiency switching audio amplifier. More...


Applications


Mobile phones
PDAs
Portable electronic devices
  Typical Application
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ParametersValues
Power@ 4Ohms, 1% THD 2.1 Watt
Power@ 8Ohms, 1% THD 1.2 Watt
Power@ 4Ohms, 10% THD 2.7 Watt
Power@ 8Ohms, 10% THD 1.5 Watt
THD 0.65 %
PSRR 65 dB
SNR 83 dB
Channels 2 Channels
THD Conditions Po=100mWrms, f=1kHz, 22kHz BW, Both channels in phase
PSRR Conditions 100mVrms, fripple=217Hz, Po=10mW, 1kHz
SNR Conditions Po=1Wrms;A-Weighted Filter
User Supply 5 Volt
Shut down Yes
Mono/Stereo Stereo
Shutdown Type Low
Supply Range +2.7 - +5.5 V
Temperature Min -40 deg C
Temperature Max 85 deg C


Typical Performance


*click for larger image


  Connection Diagram
*click for larger image


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM4666 Boomer ® Audio Power Amplifier Series Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier 642
Kbytes
26-May-04 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM4666SDBDFilterless High Efficiency Stereo 1.2W Switching Audio AmplifierFull productionN/A
 
Buy Now
1+$300.001-
6 weeksN/A
LM4666SDLLP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$0.90reel
of
1000
ZXYTTE#
L4666
6 weeks50000
LM4666SDXLLP14NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$0.90reel
of
4500
ZXYTTE#
L4666
6 weeksN/A

General Description


The LM4666 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4666 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.

The LM4666 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8 transducer loads at a continuous average output of 450mW with less than 1%THD+N. Its flexible power supply requirements allow operation from 2.8V to 5.5V.

The LM4666 has high efficiency with an 8 transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 79%, reaching 84% at 450mW output power.

The LM4666 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).

The LM4666 has fixed selectable gain of either 6dB or 12dB. The LM4666 has short circuit protection against a short from the outputs to VDD or GND.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM4666SDCMOS70184060010890004309006723
LM4666SDXCMOS70184060010890004309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


[Information as of 7-Nov-2009]