Features Available in space-saving packages: LLP, Exposed-DAP TSSOP, MSOP, and ITL Ultra low current shutdown mode Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions 2.2 - 5.5V operation No output coupling capacitors, snubber networks or bootstrap capacitors required Unity-gain stable External gain configuration capability User selectable shutdown High or Low logic Level Description The LM4990 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1.25 watts of continuous average power to an 8 BTL load and 2 watts of continuous average power (LD and MH only) to a 4 BTL load with less than 1% distortion (THD+N+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4990 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4990 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown pin to be driven in a likewise manner to enable shutdown. The LM4990 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off transitions. The LM4990 is unity-gain stable and can be configured by external gain-setting resistors. Key Specification Improved PSRR at 217Hz & 1KHz 62dB Power Output at 5.0V, 1% THD+N, 4 (LD and MH only) 2W (typ) Power Output at 5.0V, 1% THD+N, 8 1.25W (typ) Power Output at 3.0V, 1% THD+N, 4 600mW (typ) Power Output at 3.0V, 1% THD+N, 8 425mW (typ) Shutdown Current 0.1µA (typ) Applications Mobile Phones PDAs Portable electronic devices

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

Datasheets

Title		Size	Date	Other Language
	LM4990 2 Watt Audio Power Amplifier with Selectable Shutdown Logic Level	1124 Kbytes	28-Oct-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4990LD/NOPB LM4990LD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.52 each at 1K+ pcs	reel of 1000
LM4990LDX/NOPB LM4990LDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.52 each at 1K+ pcs	reel of 4500
LM4990MH/NOPB LM4990MH RoHS Status	TSSOP EXP PAD	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.71 each at 1K+ pcs	reel of 1000
LM4990MM/NOPB LM4990MM RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty AITG Asia Pacific 1000 DIGI-KEY Worldwide 2131 KEIKONG Asia Pacific 27000 MOUSER Worldwide 485	$0.38 each at 1K+ pcs	reel of 1000
LM4990MMX/NOPB LM4990MMX RoHS Status	MINI SOIC	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.38 each at 1K+ pcs	reel of 3500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4990MHX	LM4990MH	NATIONAL SEMICONDUCTOR	16 Nov 2008

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

Moisture Sensitivity Level Data for LM4990.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4990 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM4990LD/NOPB LM4990LD	27.31 27.404	LLP	10	3 1	260 235	Detail	Download	N/A	ZXYTT L4990
LM4990LDX/NOPB LM4990LDX	27.31 27.404	LLP	10	3 1	260 235	Detail	Download	N/A	ZXYTT L4990
LM4990MH/NOPB LM4990MH	26.831 27.001	TSSOP EXP PAD	10	3 3	260 260	Detail	Download	N/A	ZXTT 4990
LM4990MM/NOPB LM4990MM	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT GA5
LM4990MMX/NOPB LM4990MMX	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT GA5

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

Moisture Sensitivity Level Data for LM4990.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4990 is located at RoHS Status.

CAD Symbols and Models Download LM4990 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4990LD	CMOS7	0	21301	0	0	1584000	3	449464325
LM4990LDX	CMOS7	0	21301	0	0	1584000	3	449464325
LM4990MH	CMOS7	0	21301	0	0	1584000	3	449464325
LM4990MM	CMOS7	0	21301	0	0	1584000	3	449464325
LM4990MMX	CMOS7	0	21301	0	0	1584000	3	449464325

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM4990.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM4990 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4990MHX	LM4990MH	NATIONAL SEMICONDUCTOR	16 Nov 2008