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LM4667 Filterless High Efficiency 1.3W Switching Audio Amplifier


source: | post time:2010-05-05

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM4667ITL/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I B4
LM4667MM/NOPB
LM4667MM
MINI SOIC 10 1
1
260
260
Detail Download N/A
ZXTT
GA6

PDFClick link to Download

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 8 transducer loads at a continuous average output of 450mW with less than 1%THD+N. Its flexible power supply requirements allow operation from 2.7V to 5.5V.

The LM4667 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 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 (GND).

The LM4667 has fixed selectable gain of either 6dB or 12dB. The LM4667 has short circuit protection against a short from the outputs to VDD, GND, or across the outputs.

Key Specification

Efficiency at 3V, 100mW into 8 transducer 74% (typ)
Efficiency at 3V, 450mW into 8 transducer 84% (typ)
Efficiency at 5V, 1W into 8 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

Features
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
Available in space-saving micro SMD and MSOP packages

Diagrams

Typical Application
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Connection Diagram
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*click for larger image


 


Typical Performance
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Prev:LM4675 Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum from the PowerWise® Family
Next:LM4670 Filterless High Efficiency 3W Switching Audio Amplifier


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