LT3755
LT3755-1
LT3755-2
Info: : PRODUCTION
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LT3755
LT3755-1
LT3755-2

40VIN, 75VOUT LED Controllers

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Models 45
1ku List Price Starting From $3.64
Features
  • 3000:1 True Color PWM Dimming
  • Wide Input Voltage Range: 4.5V to 40V
  • Output Voltage Up to 75V
  • 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 (LT3755-2)
  • Frequency Synchronization (LT3755-1)
  • 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
  • AEC-Q100 Qualified For Automotive Applications
Additional Details
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The LT3755, LT3755-1 and LT3755-2 are DC/DC controllers 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 fixed 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 efficiency, performance or external component size.

The LT3755/LT3755-1/LT3755-2 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability.

Applications

  • High Power LED
  • Battery Chargers
  • Accurate Current Limited Voltage Regulators
Part Models 45
1ku List Price Starting From $3.64

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- 22_0244

Epoxy Change from Henkel 8290 to 8290A for MSOP Package

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

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Jun 21, 2022

- 22_0050

UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

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- 20_0132

Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

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Jun 5, 2024

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Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)

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Jul 12, 2022

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM]

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Jun 21, 2022

- 22_0050

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UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices

Feb 4, 2020

- 20_0132

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Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC

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