Features • OCL or capacitively coupled outputs (patent pending) • External gain-setting capability • Available in space-saving MSOP and LD packages • Ultra low current shutdown mode • Mute mode allows fast turn-on (1ms) with less than 1mV change on outputs • 2V - 5.5V operation • Ultra low noise Description The LM4911 is an stereo audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16Ω load or 25mW per channel into a 32Ω load at 1% THD+N from a 3V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4911 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. In addition, the LM4911 may be configured for either single-ended capacitively coupled outputs or for OCL outputs (patent pending). The LM4911 features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mV voltage change at outputs on release. Additionally, the LM4911 features an internal thermal shutdown protection mechanism. The LM4911 is unity gain stable and may be configured with external gain-setting resistors. Key Specification PSRR at 217Hz and 1kHz 65dB (typ) Output Power at 1kHz with VDD = 2.4V, 1% THD+N into a 16Ω load 25mW (typ) Output Power at 1kHz with VDD = 3V, 1% THD+N into a 16Ω load 40mW (typ) Shutdown Current 2.0µA (max) Output Voltage change on release from Shutdown  VDD = 2.4V, RL = 16Ω (C-Coupled) 1mV (max) Mute Current 100µA (max) Applications • Portable CD players • PDAs • Portable electronics devices

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Datasheet

Title		Size	Date	Other Language
	LM4911 Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output	621 Kbytes	30-Jul-08	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1622: Application Note 1622 LM49100 Evaluation Board User's Guide	1237 Kbytes	19-Oct-07

More Application Notes

Title		Size	Date	Other Language
	AN-1622: Application Note 1622 LM49100 Evaluation Board User's Guide	1237 Kbytes	19-Oct-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM4911LD/NOPB RoHS	LLP	Lifetime buy Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 948	$0.54 each at 1K+ pcs	reel of 1000
LM4911LDX/NOPB RoHS	LLP	Lifetime buy Lead Time: 12 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$0.54 each at 1K+ pcs	reel of 4500
LM4911MM/NOPB LM4911MM RoHS	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 1591 FUTURE Worldwide 1100	$0.54 each at 1K+ pcs	reel of 1000
LM4911MMX/NOPB LM4911MMX RoHS	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$0.54 each at 1K+ pcs	reel of 3500

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4911LD	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM4911LDX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4911LD	CMOS7	0	18406	0	0	1089000	4	309006723
LM4911LDX	CMOS7	0	18406	0	0	1089000	4	309006723
LM4911MM	CMOS7	0	18406	0	0	1089000	4	309006723
LM4911MMX	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.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM4911LD	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM4911LDX	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009