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

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Datasheet

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

Featured Application Notes

Title		Size	Date	Other Language
	AN-1441: Application Note 1441 LM4962 Evaluation Board	840 Kbytes	20-Apr-06
	AN-1440: Application Note 1440 LM4962 Stereo Ceramic Speaker Driver Application Note	760 Kbytes	20-Apr-06	中文
	AN-1611: Application Note 1611 LM48555 Evaluation Board	734 Kbytes	4-Apr-07

More Application Notes

Title		Size	Date	Other Language
	AN-1440: Application Note 1440 LM4962 Stereo Ceramic Speaker Driver Application Note	760 Kbytes	20-Apr-06	中文
	AN-1441: Application Note 1441 LM4962 Evaluation Board	840 Kbytes	20-Apr-06
	AN-1611: Application Note 1611 LM48555 Evaluation Board	734 Kbytes	4-Apr-07

Design Tools

Title	Size	Date
Audio Amplifier Digital Control Interface Evaluation Board Software

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM4970SD	CMOS7	0	18406	0	0	1089000	4	309006723
LM4970SDX	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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