Texas Instruments Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier LM4666SDBD/NOPB LM4666SDBD/NOPB Scheda Tecnica
Codici prodotto
LM4666SDBD/NOPB
SNAS189A – MAY 2004 – REVISED MAY 2013
LM4666
Filterless High Efficiency Stereo 1.2W Switching
Audio Amplifier
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1
FEATURES
DESCRIPTION
The LM4666 is a fully integrated single-supply high
2
•
No Output Filter Required for Inductive
efficiency switching audio amplifier. It features an
Transducers
innovative modulator that eliminates the LC output
•
Selectable Gain of 6dB or 12dB
filter
used
with
typical
switching
amplifiers.
•
Very Fast Turn On Time: 6ms (typ)
Eliminating the output filter reduces parts count,
simplifies circuit design, and reduces board area. The
simplifies circuit design, and reduces board area. The
•
Minimum External Components
LM4666 processes analog inputs with a delta-sigma
•
"Click and Pop" Suppression Circuitry
modulation technique that lowers output noise and
•
Micro-Power Shutdown Mode
THD when compared to conventional pulse width
modulators.
modulators.
•
Short Circuit Protection
•
Available in Space-Saving NHK0014A Package
The LM4666 is designed to meet the demands of
mobile phones and other portable communication
devices. Operating on a single 3V supply, it is
mobile phones and other portable communication
devices. Operating on a single 3V supply, it is
APPLICATIONS
capable
of
driving
8
Ω
transducer
loads
at
a
•
Mobile Phones
continuous average output of 450mW with less than
•
PDAs
1%THD+N. Its flexible power supply requirements
allow operation from 2.8V to 5.5V.
allow operation from 2.8V to 5.5V.
•
Portable Electronic Devices
The
LM4666
has
high
efficiency
with
an
8
Ω
KEY SPECIFICATIONS
transducer load compared to a typical Class AB
amplifier. With a 3V supply, the IC's efficiency for a
amplifier. With a 3V supply, the IC's efficiency for a
•
Efficiency at 3V, 100mW into 8
Ω
Transducer:
100mW power level is 79%, reaching 84% at 450mW
79% (typ)
output power.
•
Efficiency at 3V, 450mW into 8
Ω
Transducer:
The LM4666 features a low-power consumption
84% (typ)
shutdown mode. Shutdown may be enabled by
•
Efficiency at 5V, 1W into 8
Ω
Transducer: 85%
driving the Shutdown pin to a logic low (GND).
(typ)
The LM4666 has fixed selectable gain of either 6dB
•
Total Quiescent Power Supply Current: 7.0mA
or 12dB. The LM4666 has short circuit protection
(typ)
against a short from the outputs to V
DD
or GND.
•
Total Shutdown Power Supply Current: 0.02µA
(typ)
(typ)
•
Single supply range: 2.8V to 5.5V
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.