LT3756EMSE-1 Datasheet PDF - Linear Technology

●DESCRIPTION

●The LT®3756, LT3756-1 and LT3756-2 are DC/DC control lers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7.15V supply. The fxed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A 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. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize effciency, performance or external component size.

●FEATURES

●■ 3000:1 True Color PWM™ Dimming

●■ Wide Input Voltage Range: 6V to 100V

●■ Output Voltage Up to 100V

●■ Constant-Current and Constant-Voltage Regulation

●■ 100mV High Side Current Sense

●■ Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology

●■ Adjustable Frequency: 100kHz to 1MHz

●■ Open LED Protection

●■ Programmable Undervoltage Lockout with Hysteresis

●■ Improved Open LED Status Pin (LT3756-2)

●■ Frequency Synchronization (LT3756-1)

●■ PWM Disconnect Switch Driver

●■ CTRL Pin Provides Analog Dimming

●■ Low Shutdown Current: <1µA

●■ Programmable Soft-Start

●■ Thermally Enhanced 16-Lead QFN (3mm × 3mm) and MSOP Packages

●APPLICATIONS

●■ High Power LED Applications

●■ Current Limited Constant Voltage Applications

●■ Battery Charging