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16-Channel LED Driver Offers 3000:1 Dimming Ratios

The LT3754, a 16-channel LED driver, uses a step-up DC-DC controller capable of driving up to 45 V of 50-mA LEDs per channel. Its internal 60-V, 1-MHz DC-DC boost mode controller is designed to operate as a constant-current LED driver for up to 160 white LEDs. From a 12-V input, the LT3754 can drive 16 channels, each with up to ten 50-mA white LEDs in series while delivering efficiencies exceeding 92%. Its multi-channel capability makes it ideal for medium and large-sized TFT-LCD backlighting applications. Its input voltage range of 6 V to 40 V makes it suited for automotive, avionic, HDTV and industrial display applications. The LT3754 offers ±2.8% (±0.7% typical) LED current matching to ensure uniform brightness of the display. Dimming ratios as high as 3000:1 can be attained. A programmable 100 kHz to 1 MHz fixed frequency operation and current mode architecture offers stable operation over a wide range of supply and output voltages while minimizing the size of the external components. The LT3754EUH is available in a 32-lead 5-mm x 5-mm QFN package and is priced at $4.25 each in lots of 1000. An industrial-grade version, the LT3754IUH, costs $5.00 each in similar quantities. All versions are available from stock. LINEAR TECHNOLOGY CORP., Milpitas, CA. (408) 432-1900.


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