3476.indd Dave

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Specifications	3476.indd Dave
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LT3476 1 3476fa High Current Quad Output LED Driver The LT®3476 is a quad output DC/DC converter designed to operate as

Specifications	3476.indd Dave
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Content	LT3476 1 3476fa High Current Quad Output LED Driver The LT®3476 is a quad output DC/DC converter designed to operate as a constant-current source for driving high current LEDs. A ﬁ xed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 200kHz and 2MHz to optimize efﬁ ciency and external component size. The LT3476 senses output current at the high side of the LED. High side current sensing is the most ﬂ exible scheme for driving LEDs, allowing buck, boost or buck- boost conﬁ gurations. Each current monitor threshold is trimmed to within 2.5% at the full scale of 105mV. With an external sense resistor, the user programs the output current range of each channel. Each of the four regulators is independently operated by that channel’s PWM signal. This PWM feature allows precise adjustment of the color mixing or dimming ratio of the LED source. Dimming ratios up to 1000:1 can be achieved. ■ RGGB Lighting ■ Automotive and Avionic Lighting ■ TFT LCD Backlighting ■ Constant-Current Sources ■ True Color PWMTM Dimming Delivers Up to 5000:1 Dimming Ratio (In Boost Conﬁ guration) ■ LED Current Regulation with High-Side Sense ■ VADJ Pin Accurately Sets LED Current Sense Threshold Over Range 10mV to 120mV ■ Four Independent Driver Channels with 1.5A, 36V Internal NPN Switches ■ Frequency Adjust Pin: 200kHz to 2MHz ■ High Efﬁ ciency Conversion = Up to 96% ■ Open LED Protection ■ Low Quiescent Current 22mA in Active Mode <10µA in Shutdown Mode ■ Wide VIN Range: 2.8V to 16V ■ Thermally Enhanced, 38-Lead, 5mm × 7mm QFN Package 100W Quad 1A × 8 LED Driver APPLICATIOSU FEATURESDESCRIPTIOU TYPICAL APPLICATIOU , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1000:1 PWM Dimming at 100Hz 10µH 2.2µF1nF21k REFCAP1-4 SW4 1.05V SW1 CAP1 100mΩ LED1 1A SW2SW3 VC1-4 VADJ1-4LED1-4 VIN PWM1-4PWM1-4RT 0.22µF0.22µF UP TO 8 LEDS VIN2.8V TO 16V PVIN 33VCAP2 100mΩ LED2 GNDSHDN LT3476 3476 TA01 SHDN 10µH 100k 2.2µF × 4 4.99k 0.22µF0.22µF 1A1A1A 10µH CAP3 100mΩ LED3 CAP4 100mΩ LED4 10µH PWM 5V/DIV ILED500mA/DIV 5µs/DIV3476 TA02
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Following Datasheets	3477fb (20 pages) 3494fb_1 (12 pages) 35-1_2 (2 pages) 35_2 (1 pages) 3500fb (28 pages) 3508fb (24 pages) 350_appnote (1 pages) 350_appnote2 (1 pages) 352001 (1 pages) 3526lfb (16 pages)
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