The LT3761 has an internal PWM generator that delivers dimming ratios as high as 50:1 or it can utilize an external PWM signal, delivering dimming ratios of up to 3,000:1. For less demanding dimming requirements, the CTRL pin can be used to offer a 10:1 analog dimming range. Its fixed frequency, current-mode architecture offers stable operation over a wide range of supply and output voltages. Output short-circuit protection and open LED protection enhance system reliability. The LT3761’s ground-referenced voltage FB pin serves as the input for several LED protection features and also makes it possible for the converter to operate as a constant-voltage source for charging applications.
The LT3761EMSE is available in a thermally enhanced MSOP-16 package. Pricing starts at $3.45 each. An extended temperature version, or I grade, the LT3761IMSE, is also available, priced starting at $3.86 each. Finally a high temperature or H grade option, the LT3761HMSE is also available, starting at $4.11 each. All pricing is based on 1,000-piece quantities and all versions are available from stock.
Summary of Features: LT3761
•3,000:1 True Color PWM Dimming for LEDs
•Wide VIN Range: 4.5V to 60V
•Rail-to-Rail Current Sense Range: 0V to 80V
•Programmable PWM Dimming Signal Generator
•Constant Current (±3%) & Constant-Voltage (±2%) Regulation
•Analog Dimming
•Drives LEDs in Boost, SEPIC, Inverting, Buck Mode, Buck-Boost Mode, or Flyback configuration
•Output Short-Circuit Protected Boost
•Open LED Protection & Reporting
•Adjustable Switching Frequency: 100kHz to 1MHz
•Programmable VIN UVLO with Hysteresis
•C/10 Indication for Battery Chargers
•Low Shutdown Current: <1µA
•Thermally Enhanced 16-Lead MSOP Package
