LT3756/LT3756-1/LT3756-2 - 100VIN, 100VOUT LED Controller

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

Typical Application

LT3756 Typical Application
LT3756 Typical Application

Description

The LT3756, LT3756-1 and LT3756-2 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 LT3756/LT3756-1/LT3756-2 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-16, MS-16

LT3756 Package Drawing
LT3756 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3756EMSE#PBF MSOP 16 E $4.29 $3.00 View
LT3756EMSE#TRPBF MSOP 16 E $3.06 View
LT3756EMSE-1#PBF MSOP 16 E $4.29 $3.00 View
LT3756EMSE-1#TRPBF MSOP 16 E $3.06 View
LT3756EMSE-2#PBF MSOP 16 E $4.29 $3.00 View
LT3756EMSE-2#TRPBF MSOP 16 E $3.06 View
LT3756EUD#PBF QFN 16 E $4.14 $2.90 View
LT3756EUD#TRPBF QFN 16 E $2.96 View
LT3756EUD-1#PBF QFN 16 E $4.14 $2.90 View
LT3756EUD-1#TRPBF QFN 16 E $2.96 View
LT3756EUD-2#PBF QFN 16 E $4.14 $2.90 View
LT3756EUD-2#TRPBF QFN 16 E $2.96 View
LT3756HMSE-2#PBF MSOP 16 H $5.22 $3.65 View
LT3756HMSE-2#TRPBF MSOP 16 H $3.71 View
LT3756IMSE#PBF MSOP 16 I $4.86 $3.40 View
LT3756IMSE#TRPBF MSOP 16 I $3.46 View
LT3756IMSE-1#PBF MSOP 16 I $4.86 $3.40 View
LT3756IMSE-1#TRPBF MSOP 16 I $3.46 View
LT3756IMSE-2#PBF MSOP 16 I $4.86 $3.40 View
LT3756IMSE-2#TRPBF MSOP 16 I $3.46 View
LT3756IUD#PBF QFN 16 I $4.71 $3.30 View
LT3756IUD#TRPBF QFN 16 I $3.36 View
LT3756IUD-1#PBF QFN 16 I $4.71 $3.30 View
LT3756IUD-1#TRPBF QFN 16 I $3.36 View
LT3756IUD-2#PBF QFN 16 I $4.71 $3.30 View
LT3756IUD-2#TRPBF QFN 16 I $3.36 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1319B-A LT3756EMSE-2 Demo Board | 100Vin, 100Vout LED Cotroller. $210.00
DC1319B-B LT3756EMSE-1 Demo Board | 100Vin, 100Vout LED Cotroller. $210.00
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Click here to view our complete list of demo boards

Applications

  • High Power LED Applications
  • Current Limited Constant Voltage Applications
  • Battery Charging

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Design Tools

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Models for the following parts are available in LTspice IV:
LT3756
LT3756-1
LT3756-2

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