The LT1937 is a highly compact, fixed-frequency, step-up DC/DC converter designed specifically to drive LEDs with a constant current. Manufactured by Linear Technology, a leader in high-performance analog integrated circuits, the LT1937 is ideal for portable applications given its small footprint and efficient power conversion.

Key Features:

• High Efficiency: Capable of efficiencies up to 92%, the LT1937 ensures minimal power loss and heat generation, enabling longer battery life in portable applications.
• Wide Input Voltage Range: With an input voltage range from 2.5V to 16V, the LT1937 is versatile and can be used in a variety of applications, from single-cell Li-Ion batteries to multi-cell battery configurations or even automotive power systems.
• Adjustable Output Voltage: The output voltage is adjustable up to 36V, making the LT1937 suitable for driving multiple LEDs in series, ensuring uniform brightness and optimizing the LED performance.
• Constant Current Drive: The LT1937 provides a constant current output, which is critical for consistent LED brightness and color, regardless of variations in input voltage or LED forward voltage.
• Small Form Factor: Its tiny external components and a 3mm x 3mm DFN or ThinSOT package make the LT1937 an excellent choice for space-constrained applications.
• Integrated Schottky Diode: The inclusion of an integrated Schottky diode simplifies the design and reduces external component count.
• Frequency Operation: Operating at a fixed frequency of 1.2MHz allows the use of small inductors and capacitors, further reducing size and providing low, predictable output ripple.

Applications:

The LT1937 is a versatile LED driver that can be used in a variety of applications, including:

• Portable and handheld devices
• Automotive and avionic lighting
• Display backlighting
• General LED illumination

With its high efficiency, wide input voltage range, and constant current output, the LT1937 from Linear Technology stands out as an excellent choice for designers looking to optimize their LED driving solutions while minimizing space and maximizing battery life.