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LM4675 Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum from the PowerWise® Family


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
LM4675SD/NOPB
LLP 8 1 260 Detail Download N/A
ZXYTT
L4675
LM4675SDX/NOPB
LLP 8 1 260 Detail Download N/A
ZXYTT
L4675
LM4675TL/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I H8
LM4675TLX/NOPB
MICRO SMD 9 1 260 Detail Download N/A
XVG
I H8

PDFClick link to Download

Description

The LM4675 is a single supply, high efficiency, 2.65W, mono, Class D audio amplifier. A spread spectrum, filterless PWM architecture reduces EMI and eliminates the output filter, reducing external component count, board area consumption, system cost, and simplifying design.

The LM4675 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 4Ω speaker load at a continuous average output of 2.2W with less than 1% THD+N. Its flexible power supply requirements allow operation from 2.4V to 5.5V. The wide band spread spectrum architecture of the LM4675 reduces EMI-radiated emissions due to the modulator frequency.

The LM4675 has high efficiency with speaker loads compared to a typical Class AB amplifier. With a 3.6V supply driving an 8Ω speaker, the IC's efficiency for a 100mW power level is 80%, reaching 89% at 400mW output power.

The LM4675 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 LM4675 is externally configurable which allows independent gain control from multiple sources by summing the signals. Output short circuit and thermal overload protection prevent the device from damage during fault conditions.

Key Specification

Efficiency at 3.6V, 400mW into 8Ω speaker 89% (typ)
Efficiency at 3.6V, 100mW into 8Ω speaker 80% (typ)
Efficiency at 5V, 1W into 8Ω speaker 89% (typ)
Quiescent current, 3.6V supply 2.2mA (typ)
Total shutdown power supply current 0.01µA (typ)
Single supply range 2.4V to 5.5V
PSRR, f = 217Hz 82dB

Applications

Mobile phones
PDAs
Portable electronic devices

Features
Spread spectrum architecture reduces EMI
Mono Class D Operation
No output filter required for inductive loads
Externally configurable gain
Very fast turn on time: 17μs (typ)
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Available in space-saving 0.5mm pitch micro SMD and LLP packages

Diagrams

Typical Application
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Connection Diagram
*click for larger image


*click for larger image



Typical Performance
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Prev:LM78S40 Universal Switching Regulator Subsystem
Next:LM4667 Filterless High Efficiency 1.3W Switching Audio Amplifier


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