Texas Instruments Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier (LLP-8) LM4675SDBD/NOPB LM4675SDBD/NOPB 데이터 시트
제품 코드
LM4675SDBD/NOPB
SNAS353C – AUGUST 2006 – REVISED MAY 2013
LM4675
Ultra-Low EMI, Filterless, 2.65W, Mono, Class D
Audio Power Amplifier with Spread Spectrum
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FEATURES
DESCRIPTION
The LM4675 is a single supply, high efficiency,
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•
Spread Spectrum Architecture Reduces EMI
2.65W, mono, Class D audio amplifier. A spread
•
Mono Class D Operation
spectrum, filterless PWM architecture reduces EMI
•
No Output Filter Required for Inductive Loads
and eliminates the output filter, reducing external
component count, board area consumption, system
component count, board area consumption, system
•
Externally Configurable Gain
cost, and simplifying design.
•
Very Fast Turn On Time: 17
μ
s (typ)
The LM4675 is designed to meet the demands of
•
Minimum External Components
mobile phones and other portable communication
•
"Click and Pop" Suppression Circuitry
devices. Operating on a single 5V supply, it is
•
Micro-Power Shutdown Mode
capable of driving a 4
Ω
speaker load at a continuous
average output of 2.2W with less than 1% THD+N. Its
•
Available in Space-Saving 0.5mm Pitch
flexible power supply requirements allow operation
DSBGA and WSON Packages
from 2.4V to 5.5V. The wide band spread spectrum
architecture of the LM4675 reduces EMI-radiated
architecture of the LM4675 reduces EMI-radiated
APPLICATIONS
emissions due to the modulator frequency.
•
Mobile Phones
The LM4675 has high efficiency with speaker loads
•
PDAs
compared to a typical Class AB amplifier. With a 3.6V
•
Portable Electronic Devices
supply driving an 8
Ω
speaker, the IC's efficiency for a
100mW power level is 80%, reaching 89% at 400mW
output power.
output power.
KEY SPECIFICATIONS
The LM4675 features a low-power consumption
•
Efficiency at 3.6V, 400mW into 8
Ω
Speaker:
shutdown mode. Shutdown may be enabled by
89% (typ)
driving the Shutdown pin to a logic low (GND).
•
Efficiency at 3.6V, 100mW into 8
Ω
Speaker:
The gain of the LM4675 is externally configurable
80% (typ)
which allows independent gain control from multiple
•
Efficiency at 5V, 1W into 8
Ω
Speaker: 89%
sources by summing the signals. Output short circuit
(typ)
and thermal overload protection prevent the device
•
Quiescent Current, 3.6V Supply: 2.2mA (typ)
from damage during fault conditions.
•
Total Shutdown Power Supply Current: 0.01µA
(typ)
(typ)
•
Single Supply Range: 2.4V to 5.5V
•
PSRR, f = 217Hz: 82dB
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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 © 2006–2013, 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.