LT3491
Linear Technology
Demonstration circuit 905 is a LED Driver in SC70 With Built-in Schottky featuring the LT3491.
Design DocumentAnalog
LT3491: Demonstration Circuit 905 LED Driver User Guide
User guide for demonstration circuit 905 featuring the LT3491 LED driver, a step-up DC/DC converter driving up to 6 LEDs from a 3V to 5V input range.
Overview
Demonstration circuit 905 showcases the LT3491, a fixed-frequency step-up current mode DC/DC converter in an SC70 package with a built-in Schottky diode. The board features two distinct evaluation circuits: a Small Size circuit providing 15mA and a High Efficiency circuit providing 20mA to a string of 6 LEDs. The LT3491 operates at a high switching frequency of up to 2.8 MHz and includes internal open-circuit protection. Its high-side current sensing capability allows for a single-wire current source configuration. The board supports various dimming techniques, including filtered PWM, direct DC, and direct PWM control, with an operating input voltage range of 3V to 5V.
Use Cases
- Handheld device backlighting
- Mobile phone display lighting
- Digital camera flash or backlight
- Battery-powered LED applications
- Small form-factor LED current sources
Topics
LT3491
LED driver
DC/DC converter
step-up converter
boost converter
SC70
Schottky diode
high side current sensing
PWM dimming
DC905A
open circuit protection
Referenced Parts
| LT3491 | Linear Technology | Demonstration circuit 905 is a LED Driver in SC70 With Built-in Schottky featuring the LT3491. |