LT3797

PRODUCTION

Triple Output LED Driver Controller

Data Sheet (Rev. C) Product Selection Table
Part Models
6
1ku List Price
Starting From $5.83
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Part Details

  • Three Independent LED Driver Channels
  • Wide Input Voltage Range: 2.5V to 40V
  • VIN Transient Ride-Through Up to 60V
  • Rail-to-Rail LED Current Sense: 0V to 100V
  • 3000:1 PWM Dimming
  • TG Drivers for PMOS LED Disconnection
  • Operates in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology
  • Open-LED Protection
  • Short-Circuit Protected Boost Capable
  • Fault Flags for Independent Channels
  • Programmable VIN Undervoltage and Overvoltage Lockout
  • Adjustable Switching Frequency: 100kHz to 1MHz
  • Synchronizeable to an External Clock
  • CTRL Pins Provide Analog Dimming
  • Programmable Soft-Start
  • Low Profile 52-Lead 7mm x 8mm QFN and 48-Lead Exposed Pad LQFP
LT3797
Triple Output LED Driver Controller
LT3797 Application Circuit LT3797 Pin Configuration LT3797 Pin Configuration
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Documentation

Data Sheet 1

User Guide 3

Technical Articles 2

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Hardware Ecosystem

Parts Product Life Cycle Description
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT3797
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1784B

LT3797EUKG Demo Board: 2.5V to 40V input to 1A output at up to 50V

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Product Details

DC1784B is a triple boost LED driver featuring the LT3797 triple boost LED controller. It accepts an input voltage from 2.5V to 40V (with higher transient) and drives three independent strings of up to 50V LEDs at 1A. DC1784B features independent PWM and analog dimming of each of the three LED strings. Each of the three channels has its own short-circuit protection, open LED protection, and FAULT flag output.


 



eval board
schematic 2
DC1784A

LT3797EUKG Demo Board | Triple Boost LED Driver, 2.5V ≤ VIN ≤ 40VIN, 50VLED @ 1A (x3)

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Product Details

DC1784A is a triple boost LED driver featuring the LT3797 triple boost LED controller. It accepts an input voltage from 2.5V to 40V (with higher transient) and drives three independent strings of up to 50V LEDs at 1A. DC1784A features independent PWM and analog dimming of each of the three LED strings. Each of the three channels has its own short-circuit protection, open LED protection, and FAULT flag output.



eval board
schematic 3
schematic 4
schematic 5
schematic 6
schematic 7
schematic 8
DC2218A

LT3965EFE/LT3797 Demo Board | 2-String Buck LED Driver with Matrix LED Dimmer; 9V ≤ VIN ≤ 30V, up to 30VLED @ 500mA (8 LEDs/String)

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Product Details

Demonstration circuit DC2218A is a matrix LED dimmer system featuring the LT3965 8-switch matrix LED dimmer IC. There are 16 500mA LEDs that can be individually turned on, off, or PWM dimmed with two 8-switch LED dimmer LT3965 ICs. The two strings of LEDs are driven with two buck LED driver outputs of the LT3797 triple LED controller IC. The third channel of the LT3797 serves as a 30V pre-boost voltage regulator to provide a proper input voltage to the two buck LED driver channels. DC2218A can be driven from a 9V to 30V input and can survive transients up to 36V.
DC1784B
LT3797EUKG Demo Board: 2.5V to 40V input to 1A output at up to 50V
Figure 1. Test Procedure Setup Drawing for DC1784B
DC1784A
LT3797EUKG Demo Board | Triple Boost LED Driver, 2.5V ≤ VIN ≤ 40VIN, 50VLED @ 1A (x3)
DC1784A - Schematic
DC2218A
LT3965EFE/LT3797 Demo Board | 2-String Buck LED Driver with Matrix LED Dimmer; 9V ≤ VIN ≤ 30V, up to 30VLED @ 500mA (8 LEDs/String)
DC2218A Demo Board DC2218A Demo Board DC2218A Demo Board DC2218A Demo Board DC2218A Demo Board DC2218A - Schematic

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RE: LT3797
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RE: LT3797 - Output used as a buck?
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