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ADI Power by Linear LT3599(Dual String)

4-Channel 120mA LED Driver with ±1.5% Current Matching

Overview

TopologyBoost Converter
Input voltage3.1-30 V
Switching frequency200-2100 kHz
Output 144 V
IC revisionE

Description

The LT®3599 is a fi xed frequency 2A step-up DC/DC converter designed to drive four strings of 120mA LEDs up to a 44V output voltage. The switching frequency is programmable from 200kHz to 2.1MHz through an external resistor.

LED dimming can be achieved with analog dimming on the CTRL pin, and with pulse width modulation dimming on the PWM pin. The LT3599 accurately regulates LED current even when the input voltage is higher than the LED output voltage.

Additional features include programmable LED current derating, switching frequency synchronization to an external clock, LED string disable control, OPENLED alert pin, SHORTLED alert pins and programmable maximumoutput voltage when all LED strings are disconnected.The LT3599 is available in the thermally enhanced 32-pin (5mm × 5mm) QFN and 28-pin TSSOP packages.

Features

  • True Color PWMTM Dimming Ratio Up to 3000:1
  • Drives Four Strings of LEDs at Up to 120mA
  • ±1.5% Accurate LED Current Matching
  • Wide Input Voltage Range: 3.1V to 30V
  • Output Voltage Up to 44V
  • Regulates LED Current Even When VIN > VOUT
  • Disconnects LEDs in Shutdown
  • Programmable Maximum VOUT (Regulated)
  • Open/Short LED Protection and Fault Flags
  • Programmable LED Current Derating
  • Adjustable Frequency: 200kHz to 2.1MHz
  • Synchronizable to an External Clock
  • Analog Dimming Up to 20:1
  • Programmable Input UVLO with Hysteresis
  • Thermally Enhanced 32-Pin (5mm × 5mm) QFN and 28-Pin TSSOP Packages

Remarks

  • For Inductor Values Refer Page no-10

Typical applications

  • Desktop and Notebook TFT LCD Displays
  • Automotive Navigation TFT LCD Displays

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
fres
(MHz)
MountL1
(µH)
IR
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC max.
(Ω)
fres 1
(MHz)
Samples
74454068SPEC
9 files WE-PD3 SMT Power Inductor 7 2.2 4.1 0.041 33 7 2.2 4.1 0.041 0.055 33
744065100SPEC
9 files WE-TPC SMT Tiny Power Inductor 10 3 2.5 0.04 25 SMT
74454010SPEC
9 files WE-PD3 SMT Power Inductor 10 2 3.2 0.048 25 10 2 3.2 0.048 0.065 25
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
fres
(MHz)
MountL1
(µH)
IR
(A)
ISAT 1
(A)
RDC1 typ
(Ω)
RDC max.
(Ω)
fres 1
(MHz)
Samples