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LM4670 Filterless High Efficiency 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
LM4670ITL/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I E6
LM4670ITLX/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I E6
LM4670SD/NOPB
LM4670SD
LLP 8 1
1
260
260
Detail Download N/A
ZXYTT
L4670
LM4670SDX/NOPB
LM4670SDX
LLP 8 1
1
260
260
Detail Download N/A
ZXYTT
L4670

PDFClick link to Download

Description

The LM4670 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 external component count, simplifies circuit design, and reduces board area. The LM4670 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.

The LM4670 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 5V supply, it is capable of driving a 4 speaker load at a continuous average output of 2.3W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V.

The LM4670 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8 speaker, the IC's efficiency for a 100mW power level is 77%, reaching 88% at 600mW output power.

The LM4670 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND).

The gain of the LM4670 is externally configurable which allows independent gain control from multiple sources by summing the signals.

Key Specification

Efficiency at 3.6V, 100mW into 8 speaker 77% (typ)
Efficiency at 3.6V, 600mW into 8 speaker 88% (typ)
Efficiency at 5V, 1W into 8 speaker 87% (typ)
Quiescent current, 3.6V supply 4.8mA (typ)
Total shutdown power supply current 0.01µA (typ)
Single supply range 2.4V to 5.5V

Applications

Mobile phones
PDAs
Portable electronic devices

Features
No output filter required for inductive loads
Externally configurable gain
Very fast turn on time: 1.35ms (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Short circuit protection
Available in space-saving microSMD and LLP 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:LM4667 Filterless High Efficiency 1.3W Switching Audio Amplifier
Next:LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier


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