Filterless High Efficiency 1.3W Switching Audio Amplifier - Texas Instruments
Description
LM4667, LM4667MMBD
www.
ti.
com
SNAS165C – SEPTEMBER 2003 – REVISED MAY 2013
LM4667
Filterless High Efficiency 1.
3W Switching Audio Amplifier
Check for Samples: LM4667, LM4667MMBD
FEATURES
1
•2 No Output Filter Required for Inductive Transducers
• Selectable Gain of 6dB or 12dB • Very Fast Turn on Time: 5ms (typ) • Minimum External Components • "Click and Pop" Suppression Circuitry • Micro-Power Shutdown Mode • Short Circuit Protection • Space-Saving DSBGA and VSSOP Packages
KEY SPECIFICATIONS
• Efficiency at 3V, 100mW into 8Ω Transducer 74% (typ)
• Efficiency at 3V, 450mW into 8Ω Transducer 84% (typ)
• Efficiency at 5V, 1W into 8Ω Transducer 86% (typ)
• Total Quiescent Power Supply Current: 3.
5mA (typ)
• Total Shutdown Power Supply Current: 0.
01μA (typ)
• Single Supply Range: 2.
7V to 5.
5V
APPLICATIONS
• Mobile Phones • PDAs • Portable Electronic Devices
DESCRIPTION
The LM4667 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 LM4667 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.
The LM4667 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 8Ω transducer loads at a continuous average output of 450mW with less than 1%THD+N.
Its flexible power supply requirements allow operation from 2.
7V to 5.
5V.
The LM4667 has high efficiency with an 8Ω transducer load compared to a typical Class AB amplifier.
With a 3V supply, the IC's efficiency for a 100mW power level is 74%, reaching 84% at 450mW output power.
The LM4667 features a low-power consumption shutdown mode.
Shutdown may be enabled by driving the Shutdown pin to a logic low ...
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