LT3597 - 60V Triple Step-Down LED Driver

Features

  • Three 100mA Buck Regulators, Each Drives Up to 10 LEDs with Fast NPN Current Sources
  • Fast Current Sources for <1µs Pulse Widths (10,000:1 True Color PWM™ Dimming at 100Hz)
  • LEDs Disconnected in Shutdown
  • Adaptive V
  • OUT for Increased Efficiency
  • 6V to 60V Input Voltage Range
  • ±2% LED Current Matching
  • External Resistor Sets LED Current for Each Channel
  • Internal Compensation and Soft-Start
  • Programmable Switching Frequency (200kHz to 1MHz)
  • Synchronizable to External Clock
  • Open LED Detection and Reporting
  • Shorted LED Pin Protection and Reporting
  • Programmable LED Thermal Derating
  • Programmable Temperature Protection
  • 5mm × 8mm Thermally Enhanced QFN Package with a 0.6mm High Voltage Pin Spacing

Typical Application

LT3597 Typical Application
LT3597 Typical Application

Description

The LT3597 is a 60V triple step-down LED driver capable of achieving 10,000:1 digital PWM dimming at 100Hz with fast NPN current sources driving up to 10 LEDs in each channel. LED dimming can also be achieved via analog control of the CTRL1-3 pin.

The step-down switching frequency is programmed between 200kHz and 1MHz. The frequency is also synchronizable to an external clock. The LT3597 provides maximum LED brightness while adhering to manufacturers’ specifications for thermal derating. The derate temperature is programmed by placing a negative temperature coefficient (NTC) resistor on the master control pin.

The LT3597 adaptively controls VOUT in order to achieve optimal efficiency. Other features include: 2% LED current matching between channels, open LED reporting, shorted LED protection, programmable LED current, and programmable temperature protection.

Packaging

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

QFN-52

LT3597 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT3597EUHG#PBF QFN 51 E $5.64 $3.95 View
LT3597EUHG#TRPBF QFN 51 E $4.01 View
LT3597IUHG#PBF QFN 51 I $6.49 $4.54 View
LT3597IUHG#TRPBF QFN 51 I $4.60 View
Buy NowRequest Samples
* 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
DC1497A LT3597EUHG Demo Board: 60V Triple Step-Down LED Driver $150.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • LED Billboards and Signboards
  • Mono, Multi, Full-Color LED Displays
  • Large Screen Display LED Backlighting
  • Automotive, Industrial, and Medical Displays

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspiceIV

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As". After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LT3597

Technical Support