Features Audio synchronized color LED driver User defined LED pattern, color, and intensity capability Programmable:  LED Drive current  PWM frequency  High pass filter frequency select  Audio input signal gain Eliminates external LED current limiting resistors I 2C compatible interface Ultra low shutdown current Description The LM4970 is a LED driver with an audio synchronization mode that virtually eliminates the need for real time software processing for LED lighting effects. The LM4970 includes three individual PWM color LED drivers that provide up to 42mA of current drive for each PWM LED output. The LM4970 features an audio synchronization mode where the audio input signal that is mixed in from three audio inputs is filtered into three frequency bands, with each frequency band assigned to a specific PWM LED driver. The PWM LED drivers can also be directly programmed through an I 2C compatible interface for applications where user defined LED pattern, color, and intensity programmability is a priority. The LM4970 also features an audio input gain control which allows the user to increase the gain if the audio input signal does not create a bright enough effect on the LEDs. The LM4970 is a feature rich LED driver that is available in a space saving 14 pin non-pullback LLP package. Key Specification ■  LED Drive Current per channel  VDD = 5V 42mA (2X setting) ■  Shutdown Current, VDD = 5V 1.5μA (typ) Applications Cell Phones Portable MP3, CD, DVD, AAC players PDA's

	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM4970 Audio Synchronized Color LED Driver	359 Kbytes	1-Apr-08

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM4970SD/NOPB LM4970SD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 1763 FARNELL Europe and Asia 946 MOUSER Worldwide 993 NEWARK Americas 915	$0.90 each at 1K+ pcs	reel of 1000
LM4970SDX/NOPB LM4970SDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$0.90 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 LM4970.

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 LM4970 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
LM4970SD/NOPB LM4970SD	27.794 27.897	LLP	14	1 1	260 260	Detail	Download	N/A	ZXYTTE# L4970
LM4970SDX/NOPB LM4970SDX	27.794 27.897	LLP	14	1 1	260 260	Detail	Download	N/A	ZXYTTE# L4970

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 LM4970.

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 LM4970 is located at RoHS Status.

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

CAD Symbols and Models Download LM4970 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4970SD	CMOS7	0	21301	0	0	1584000	3	449464325
LM4970SDX	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 LM4970.

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 LM4970 is located at RoHS Status.