Milpitas, Calif. Linear Technology developed the LT3496, a 2 MHz DC/DC converter designed to operate as a three-channel constant-current LED driver. Each of the converter's three channels can drive up to eight 500 mA LEDs in series, enabling it to drive up to 24 x 500 mA LEDs at efficiencies up to 96%. All three channels are controlled by an independent True Color PWM signal, enabling each to be dimmed independently to ratios as high as 3,000:1. A fixed-frequency, current-mode architecture ensures stable operation over a range of supply and output voltages. A frequency-adjust pin enables the user to program the frequency between 330 kHz and 2.1 MHz to optimize efficiency while minimizing external component size.
The LT3496 senses output current at the high-side of the LED, enabling buck, buck-boost or boost configurations. With an external sense resistor, the user programs the output-current range of each channel. Each of the three independent driver channels uses an internal 750 mA, 45 V NPN switch and has a built-in gate driver for PMOS disconnect. Other features include open LED protection and thermal limiting.
Pricing: Begins at $3.50 each in 1,000-piece quantities
Data Sheet: LT3496 DC/DC converter
Linear Technology, 408-432-1900, www.linear.com