Features Stereo filterless Class D amplifier Selectable OCL/CC headphone amplifier Headphone sense ability National’s 3D Enhancement RF suppression I 2C control interface 32-step digital volume control 6 Operating Modes Output short circuit protection and thermal shutdown protection Minimum external components Click and Pop suppression Micro-power shutdown Independent speaker and headphone volume controls Available in space-saving 28 pin LLP package Description The LM49270 is a fully integrated audio subsystem designed for stereo multimedia applications. The LM49270 combines a 2.2W stereo Class D amplifier with a 155mW stereo headphone amplifier, volume control, headphone sense, and National’s unique 3D sound enhancement into a single device. The LM49270 uses flexible I 2C control interface for multiple application requirements. The filterless stereo class D amplifiers delivers 2.2W/channel into a 4Ω load with less than 10% THD+N with a 5V supply. The headphone amplifier features National’s Output Capacitor-less (OCL) architecture that eliminates the output coupling capacitors required by traditional headphone amplifiers. The IC features a headphone sense input (HPS) that automatically detects the presence of a headphone and configures the device accordingly. The LM49270 can automatically switch from OCL headphone output to a line driver output. If the VOC pin is pulled to GND, the VOC amplifier is disabled and the VOC pin is internally set to GND. This feature allows the LM49270 to be used as a line driver in OCL mode without a GND conflict on the headphone jack sleeve. Additionally, the headphone amplifier can be configured as capacitively coupled (CC). The LM49270 features a 32 step volume control for the headphone and stereo outputs. The device mode select and volume are controlled through an I 2C compatible interface. Output short circuit and thermal shutdown protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49270 is available in a space saving 28-pin, 5x5mm LLP package. Key Specification ■  Stereo Class D Amplifier Efficiency:    VDD = 3.3V, 450mW/Ch into 8Ω 84%  VDD = 5V, 1W/Ch into 8Ω 84% ■  Quiescent Power Supply Current, VDD = 3.3V  Speaker Mode 5.5mA  Headphone Mode (OCL) 4mA ■  Power Output/Channel, VDD = 5V    Class D Speaker amplifier:    RL = 4Ω, THD+N = ≤ 10% 2.2W  RL = 8Ω, THD+N = ≤ 1% 1.06W  Headphone amplifier:    RL = 16Ω, THD+N = ≤ 1% 155mW  RL = 32Ω, THD+N = ≤ 1% 90mW ■  Shutdown current 0.02μA Applications Portable DVD players Smart phones PDAs Laptops

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

Parameters Values Power @ 5V 8Ohms, 1% THD 1.06 Watt Speaker THD+N 0.02 % HP THD+N 0.015 % Speaker PSRR 75 dB HP PSRR 79 dB Speaker SNR Undefined dB Audio Mux Yes Audio Mode Control I2C Supply Range +2.4 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Mono Analog Inputs 0 Stereo Analog Inputs 1 Digital Audio Ports 0 Additional Audio Features National 3D Loudspeaker Type Class D Loudspeaker Outputs 2 Headphone Type Virtual Ground AEC Q-100 Automotive Grade Undefined

Datasheets

Title		Size	Date	Other Language
	LM49270 Filterless 2.2W Class D Audio Subsystem with OCL Headphone Amplifier, 3D Enhancement, and Headphone Sense	2575 Kbytes	17-Mar-07

Application Notes

Title		Size	Date	Other Language
	AN-1638: Application Note 1638 LM49270 Demonstration Board	321 Kbytes	24-May-07	中文

Other Technical Documents

Title		Type	Date
	Your Walls Will Be Changing (Circuits for LCD Multimedia TV Panels)	External Article	2007-09-12

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49270SQ/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 FARNELL Europe and Asia 3 RS COMPONENTS Worldwide 998	$2.45 each at 1K+ pcs	reel of 1000
LM49270SQE/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.45 each at 1K+ pcs	reel of 250
LM49270SQX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.45 each at 1K+ pcs	reel of 4500

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 LM49270.

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 LM49270 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49270SQEVAL	LM49270SQEVAL Evaluation Board	Preliminary	Distributor Region Qty DIGI-KEY Worldwide 0	CALL	N/A

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM49270SQ/NOPB	67.125	LLP	28	1	260	Detail	N/A	N/A	NS UZXYTT 49270SQ
LM49270SQE/NOPB	67.125	LLP	28	1	260	Detail	N/A	N/A	NS UZXYTT 49270SQ
LM49270SQX/NOPB	67.125	LLP	28	1	260	Detail	N/A	N/A	NS UZXYTT 49270SQ

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 LM49270.

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 LM49270 is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM49270SQ	CMOS7	0	21301	0	0	1584000	3	449464325
LM49270SQE	CMOS7	0	21301	0	0	1584000	3	449464325
LM49270SQX	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 LM49270.

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 LM49270 is located at RoHS Status.