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 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

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Typical Application click for larger image	Connection Diagram *click for larger image *click for larger image
Typical Performance *click for larger image

Datasheets

Title		Size	Date	Other Language
	LM4667 Boomer ® Audio Power Amplifier Series Filterless High Efficiency 1.3W Switching Audio Amplifier	757 Kbytes	21-Sep-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM4667ITL/NOPB RoHS Status	MICRO SMD	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 750 DIGIKEY Worldwide 1020 FARNELL Europe and Asia 7 RS COMPONENTS Worldwide 250	$0.52 each at 1K+ pcs	reel of 250
LM4667MM/NOPB LM4667MM RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0 FARNELL Europe and Asia 2177 KEIKONG Asia Pacific 181000 RS COMPONENTS Worldwide 330 TECHMOSA Asia Pacific 1000	$0.50 each at 1K+ pcs	reel of 1000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4667MMX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

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

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

CAD Symbols and Models Download LM4667 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4667ITL	CMOS7	0	18406	0	0	1089000	4	309006723
LM4667MM	CMOS7	0	18406	0	0	1089000	4	309006723
LM4667MMX	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4667MMX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009