LT3597 - 60V Triple Step-Down LED Driver


  • 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


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.


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

Part Number Package Code Temp Package
LT3597EUHG#PBF 5x8 QFN-52 UHG E 05-08-1846 RoHS
LT3597EUHG#TRPBF 5x8 QFN-52 UHG E 05-08-1846 RoHS
LT3597IUHG#PBF 5x8 QFN-52 UHG I 05-08-1846 RoHS
LT3597IUHG#TRPBF 5x8 QFN-52 UHG I 05-08-1846 RoHS

LT3597 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT3597EUHG#PBF 5x8 QFN-52 E $5.64 $3.95 Yes
LT3597EUHG#TRPBF 5x8 QFN-52 E $4.01 Yes
LT3597IUHG#PBF 5x8 QFN-52 I $6.49 $4.54 Yes
LT3597IUHG#TRPBF 5x8 QFN-52 I $4.60 Yes
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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
DC1497A LT3597EUHG Demo Board | Triple Step-Down LED Driver, 6V ≤ VIN ≤ 55V, VLED up to 34V @ 100mA (x3) $150.00
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  • Large Screen Display LED Backlighting
  • Automotive, Industrial, and Medical Displays

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Design Tools


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