Linear Technology LT1937ESC6#TR - Compact, High Efficiency LED Driver
The LT1937ESC6#TR is a highly efficient, fixed-frequency, step-up DC/DC converter designed by Linear Technology specifically to drive LEDs. This compact and versatile component comes in a small ThinSOT-23 package, making it an ideal choice for space-constrained applications. Its ability to convert input voltages as low as 1V up to a constant LED current output makes it perfect for portable, battery-powered devices requiring high-brightness LED backlighting or illumination.
With an internal 36V, 1.4A switch, the LT1937ESC6#TR can drive up to six white LEDs from a single Li-Ion cell, or two strings of four LEDs from a 5V supply. This feature provides designers with flexibility in configuring LED arrays for various applications while ensuring uniform brightness and high efficiency.
The device operates at a fixed frequency of 1.2MHz, allowing the use of tiny, low-cost capacitors and inductors. Moreover, the high switching frequency enables the LT1937ESC6#TR to keep the external components to a minimum, further saving on board space and cost. It also features a unique single-pin dimming and shutdown control that lowers the input current to less than 1µA during shutdown, providing an additional power-saving advantage.
Protection features of the LT1937ESC6#TR include current limiting and thermal shutdown, ensuring the longevity and reliability of both the LED driver and the LEDs it powers. Its current mode operation provides fast transient response and excellent loop stability. The LED current is set with an external resistor and can be modulated with an analog or digital signal, allowing for flexible brightness control.
Overall, the LT1937ESC6#TR from Linear Technology is a high-performance LED driver solution that combines small packaging, high efficiency, and robust features. It is suitable for a wide range of applications, including handheld devices, GPS units, cameras, and other portable equipment where extended battery life and compact design are critical.
