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LED driver drives up to six strings of 10 LEDs each

Milpitas, Calif.— Linear Technology has designed its 45V, 2.5MHz DC/DC boost mode converter to operate as a constant current LED driver for up to sixty white LEDs.

The LT3598 can drive up to six strings of LEDs, each with up to ten 30mA white LEDs in series while delivering efficiencies up to 90%.

Its multichannel capability makes it suitable for medium sized TFT-LCD backlighting applications. It offers an input voltage range of 3V to 30V for automotive and industrial applications. It delivers 1.5% LED current matching to insure uniform brightness of the display. Dimming ratios as high as 3,000:1 can be attained by using True Color PWM dimming. A programmable 200-kHz to 2.5-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 LT3598EUF is available from stock in a thermally enhanced 24-lead 4mm x 4mm QFN package, 1,000-piece pricing starts at $2.95 each. An industrial grade version, the LT3598IUF is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $3.39 in 1,000-piece quantities.

Datasheet: Click here.

Linear Technology, www.linear.com

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