The LT3496 is a triple output DC/DC converter designed to operate as a constant-current source and is ideal for driving LEDs. The LT3496 works in buck, boost or buck-boost mode. The LT3496 uses a fixed frequency, current mode architecture resulting in stable operation over a wide range of supply and output voltages. A frequency adjust pin allows the user to program switching frequency between 330kHz and 2.1MHz to optimize efficiency and external component size. The LT3496 supports 3000:1 dimming control on each channel. Each of the three regulators is independently operated by that channel’s PWM signal. The PWM feature allows precise adjustment of the color mixing or dimming ratio of the LED source. Each of the three channels has a built-in gate driver to drive an external LED-disconnect P-channel MOSFET, allowing high dimming range. The output current range of each channel of the LT3496 is programmed with an external sense resistor. The CTRL pin is used to adjust the LED current either for analog dimming or overtemperature protection.
The LT3496 is a triple‑output constant‑current LED driver that can operate in buck, boost, or buck‑boost mode. Each channel provides up to 750 mA and supports true‑color PWM dimming up to a 3000:1 ratio, making it suitable for RGB lighting, billboards, automotive lighting, and other high‑power LED applications.
The device features a wide input voltage range of 3 V to 30 V, selectable switching frequency from 330 kHz to 2.1 MHz via the FADJ pin, and built‑in gate drivers for external P‑channel MOSFETs. It is offered in 28‑lead QFN and TSSOP packages and includes protection functions such as open‑LED and over‑voltage protection.
| Input Voltage Range | 3 V to 30 V |
|---|---|
| Maximum LED Current per Channel | 750 mA |
| Adjustable Switching Frequency | 330 kHz to 2.1 MHz |
| PWM Dimming Ratio | Up to 3000:1 |
| Package Types | 28‑lead QFN (4 mm × 5 mm) and 28‑lead TSSOP |
The LT3496 operates with an input voltage from 3 V to 30 V.
It has three independent driver channels, each capable of 750 mA.
The device supports a PWM dimming ratio of up to 3000:1.
Yes, the switching frequency can be set between 330 kHz and 2.1 MHz using the FADJ pin.