Features • Operating input voltage range of -9V to -14V w.r.t. LED anode • Control inputs are referenced to the LED anode • Output current greater than 6A • Greater than 30kHz PWM frequency capable • Negative output voltage capability allows LED anode to be tied directly to chassis for maximum heat sink efficacy • No output capacitor required • Up to 1MHz switching frequency • Low IQ, 1mA typical • Soft start • Adaptive programmable ON time allows for constant ripple current • LLP-24 package Description The LM3433 is an adaptive constant on-time DC/DC buck (step-down) constant current controller (a true current source). The LM3433 provides a constant current for illuminating high power LEDs. The output configuration allows the anodes of multiple LEDs to be tied directly to the ground referenced chassis for maximum heat sink efficacy. The high frequency capable architecture allows the use of small external passive components and no output capacitor while maintaining low LED ripple current. Two control inputs are used to modulate LED brightness. An analog current control input is provided so the LM3433 can be adjusted to compensate for LED manufacturing variations and/or color temperature correction. The other input is a logic level PWM control of LED current. The PWM functions by shorting out the LED with a parallel switch allowing high PWM dimming frequencies. High frequency PWM dimming allows digital color temperature control, interference blanking, field sequential illumination, and brightness control. Additional features include thermal shutdown, VCC under-voltage lockout, and logic level shutdown mode. The LM3433 is available in a low profile LLP-24 package. Applications • LCD backlighting • Projection systems • Solid state lighting • Automotive lighting

LM3433   9.00 <= V in Lower  V   <= V in Upper  V   <= 14.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Front page schematic MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image Front page schematic	Block Diagram click for larger image Block diagram
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Datasheet

Title		Size	Date	Other Language
	LM3433 Common Anode Capable High Brightness LED Driver with High Frequency Dimming	338 Kbytes	7-Mar-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1736: Application Note 1736 LM3433 HB LED Driver Evaluation Kit	1011 Kbytes	4-Feb-08
	AN-1937: Application Note 1937 LM3433 10A to 40A LED Driver Evaluation Board	1559 Kbytes	25-Mar-09
	AN-1793: Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board	701 Kbytes	25-Aug-08	中文

More Application Notes

Title		Size	Date	Other Language
	AN-1679: Application Note 1679 LED Backlighting Solution with LM3430 and LM3432	2763 Kbytes	18-Sep-07
	AN-1907: Application Note 1907 LM3423 Buck-Boost Configuration Evaluation Board	879 Kbytes	8-Dec-08
	AN-1764: Application Note 1764 LM3431 Evaluation Board	588 Kbytes	10-Jan-08	中文
	AN-1529: Application Note 1529 LM3430 Evaluation Board	2770 Kbytes	21-Aug-07	中文

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3433SQ	ABCD150	0	34175	0	0	4234000	1	1201409060
LM3433SQX	ABCD150	0	34175	0	0	4234000	1	1201409060

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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