Suited for automotive LCD backlight applications, the LM3492 LED driver offers dynamic headroom control. The dynamic headroom control feature adjusts the LED supply voltage through the boost converter feedback to the lowest level required to provide optimal system efficiency. Three embedded MOSFETs reduce system complexity and cost.
The part integrates a boost converter and a two-channel current regulator to efficiently drive two independently dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. Integrated fast slew rate current regulators allow high frequency and narrow pulse width dimming signals to achieve a contrast ratio of 1,000:1. The LED current is programmable from 50 to 200 mA by a single resistor. Offered in a 20-pin thermally enhanced TSSOP package, the part also includes a versatile COMM pin, which serves as a bidirectional input/output pin interfacing with an external MCU for command and diagnostic functions. (Ea/1,000: LM3492,1.75; LM3492Q with AECQ-100 Grade 1 qualification, $2.10 — available now.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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