Features Mono and stereo inputs Thermal Overload Protection True-ground Headphone Drivers I 2C Control Interface Input mute attenuation 2nd Stage headphone attenuator 32-step digital volume control 10 Operating Modes Minimum external components Click and Pop suppression Micro-power shutdown Available in space-saving 3mm x 3mm 25 bump GR package RF Suppression Description The LM49100 is a fully integrated audio subsystem capable of delivering 1.275W of continuous average power into a mono 8Ω bridged-tied load (BTL) with 1% THD+N and with a 5V power supply. The LM49100 also has a stereo true-ground headphone amplifier capable of 50mW per channel of continuous average power into a 32Ω single-ended (SE) loads with 1% THD+N. The LM49100 has three input channels. One pair of SE inputs can be used with a stereo signal. The other input channel is fully differential and may be used with a mono input signal. The LM49100 features a 32-step digital volume control and ten distinct output modes. The mixer, volume control, and device mode select are controlled through an I 2C compatible interface. Thermal overload 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. Key Specification ■  Power Output at VDD = 5V:    Loudspeaker (LS):  RL = 8Ω, THD+N ≤ 1% 1.275W    Headphone (VDDHP = 2.8V):  RL = 32Ω, THD+N ≤ 1% 50mW ■  Shutdown current 0.01µA Applications Mobile Phones PDAs Laptops Portable Electronics

Typical Application *click for larger image	Connection Diagram *click for larger image Top View microSMD package
Typical Performance click for larger image

Parameters Values Power @ 5V 8Ohms, 1% THD 1.275 Watt Audio Mux Yes Audio Mode Control I2C Supply Range +2.7 - +5.5 V Temperature Min -40 deg C Temperature Max 85 deg C Mono Analog Inputs 1 Stereo Analog Inputs 2 Digital Audio Ports 0 Loudspeaker Type Class AB Loudspeaker Outputs 2 Headphone Type True Ground Automotive Undefined A/D Channels Undefined Channels

Datasheets

Title		Size	Date	Other Language
	LM49100 Mono Class AB Audio Sub-System with a True-Ground Headphone Amplifier	2132 Kbytes	26-Sep-07

Application Notes

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

Other Technical Documents

Title		Type	Date
	Optimizing Power Consumption in the Mobile Multimedia Infrastructure Delivery Chain - Part Two	External Article	2007-10-12

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49100GR/NOPB RoHS Status	MICRO-ARRAY	Full production Lead Time: 16 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$3.35 each at 1K+ pcs	reel of 1000

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 LM49100.

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 LM49100 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM49100GREVAL	Mono Class AB Audio Subsystem with a True-Ground Headphone Amplifier	Preliminary	Distributor Region Qty	$400.00 each	1
The LM49100 is an integrated stereo subsystem with Class AB speaker or earpiece amplifier and ground referenced headphone amplifier in a 25-bump micro Array package. The LM49100 is designed to meet the demands of mobile phones and other portable communication devices. It is capable of delivering 1.275W of average power into an 8 ohm load and 50 milliwatts of average power to a 32 ohm load with less than 1% distortion (THD+N) from a 5V DC power supply to VDD_LS and a 2.8V power supply to VDD_HP. The LM49100GREVAL is an evaluation board designed to ease evaluation and effort during the development of a circuit using the LM49100GR. The evaluation board comes with an I2C card and cable. It is an easy-to-use stand-alone board that requires power and GND, an I2C control signal, an input signal and an output load. Software for the product can be downloaded from http://audio.national.com Features: Tiny and robust micro Array Very low iddq (5mA all outputs on at 5V) High output power (1.275W into 8ohms at 5V) 90dB PSRR 217Hz for speaker output 90dB PSRR 217Hz for headphone outputs 0.035% THD+N at 630mW for speaker output 0.02% THD+N at 25mW for headphone outputs Applications: Mobile phones Portable devices, such as PMPs, Portable Navigation Devices Contents: Fully Assembled LM49100GR Evaluation Board I2C interface card and cable Instructions for where to locate and download the datasheet Please note: Go to http://audio.national.com for more information on using the LM49100GR evaluation kit. Resources: Eval Board Digital Control Software

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
LM49100GR/NOPB	19.505	MICRO-ARRAY	25	1	260	Detail	Download	N/A	XYTT GC9

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 LM49100.

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 LM49100 is located at RoHS Status.

Design Tools

Title	Size	Date
Control Software

CAD Symbols and Models Download LM49100 CAD Symbols

Models N/A