LT3598 - 6-String 30mA LED Driver with ±1.5% Current Matching


  • True Color PWM™ Dimming Delivers Up to 3000:1 Dimming Ratio
  • Drives Six Strings of LEDs at Up to 30mA
  • ±1.5% Accurate LED Current Matching
  • Wide Input Voltage Range: 3.2V to 30V
  • Output Voltage Up to 44V
  • Regulates Current Even When VIN > VOUT
  • Disconnects LEDs in Shutdown
  • Programmable Open LED Protection (Regulated)
  • OPENLED Alert Pin
  • Programmable LED Current Derating
  • Adjustable Frequency: 200kHz to 2.5MHz
  • Synchronizable to an External Clock
  • Parallel Channels for Higher Current per LED String
  • Thermally Enhanced 4mm × 4mm QFN and 24-Lead TSSOP Packages

Typical Application

LT3598 Typical Application
LT3598 Typical Application


The LT3598 is a fixed frequency step-up DC/DC converter designed to drive up to six strings of LEDs at an output voltage up to 44V. LED dimming can be achieved with analog dimming on the CTRL pin, and with pulse width modulation dimming on the PWM pin. The LT3598 accurately regulates LED current even when the input voltage is higher than the LED output voltage. The switching frequency is programmable from 200kHz to 2.5MHz through an external resistor.

Additional features include programmable overvoltage protection, switching frequency synchronization to an external clock, LED current derating based on junction temperature and/or LED temperature, LED string disable control, OPENLED alert pin and output voltage limiting when all LED strings are disconnected. The LT3598 is available in a thermally enhanced 24-lead (4mm × 4mm) QFN and 24-lead TSSOP packages.


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

Part Number Package Code Temp Package
LT3598EFE#PBF TSSOP-24 FE E 05-08-1771 RoHS
LT3598EFE#TRPBF TSSOP-24 FE E 05-08-1771 RoHS
LT3598EUF#PBF 4x4 QFN-24 UF E 05-08-1697 RoHS
LT3598EUF#TRPBF 4x4 QFN-24 UF E 05-08-1697 RoHS
LT3598IFE#PBF TSSOP-24 FE I 05-08-1771 RoHS
LT3598IFE#TRPBF TSSOP-24 FE I 05-08-1771 RoHS
LT3598IUF#PBF 4x4 QFN-24 UF I 05-08-1697 RoHS
LT3598IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 RoHS

LT3598 Package Drawing
LT3598 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
LT3598EFE#PBF TSSOP-24 E $4.57 $3.20 Yes
LT3598EFE#TRPBF TSSOP-24 E $3.26 Yes
LT3598EUF#PBF 4x4 QFN-24 E $4.22 $2.95 Yes
LT3598EUF#TRPBF 4x4 QFN-24 E $3.01 Yes
LT3598IFE#PBF TSSOP-24 I $5.20 $3.64 Yes
LT3598IFE#TRPBF TSSOP-24 I $3.70 Yes
LT3598IUF#PBF 4x4 QFN-24 I $4.84 $3.39 Yes
LT3598IUF#TRPBF 4x4 QFN-24 I $3.45 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
DC1285A LT3598EUF Demo Board | 6-String Boost LED Driver, 3.2V ≤ VIN ≤ 5.5V, Vout up to 44V @ 20mA (x6) with 2% Current Matching $150.00
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