LT3486 - Dual 1.3A White LED Step-Up Converters with Wide Dimming

The LT3486 is a dual step-up DC/DC converter specifically designed to drive up to 16 White LEDs (8 in series per converter) at constant current from a single Li-Ion cell. Series connection of the LEDs provides identical LED currents resulting in uniform brightness. The two independent converters are capable of driving asymmetric LED strings.

The dimming of the two LED strings can be controlled independently via the respective CTRL pins. An internal dimming system allows the dimming range to be extended up to 1000:1 by feeding a PWM signal to the respective PWM pins. The LT3486 operating frequency can be set with an external resistor over a 200kHz to 2.5MHz range. A low 200mV feedback voltage (±3% accuracy) minimizes power loss in the current setting resistor for better efficiency. Additional features include output voltage limiting when LEDs are disconnected and overtemperature protection.

The LT3486 is available in a space saving 16-pin DFN (5mm × 3mm × 0.75mm) and 16-pin thermally enhanced TSSOP packages.

Features
  • Wide (1000:1) PWM Dimming Range with No ColorShift
  • Independent Dimming and Shutdown Control of the LED Drivers
  • Drives Up to 16 White LEDs at 25mA (8 per Driver) from a Single Li-Ion Cell
  • Drives Up to 16 White LEDs at 100mA (8 per Driver) from 12V Supply
  • ±3% LED Current Programming Accuracy
  • Open LED Protection: 36V Clamp Voltage
  • Fixed Frequency Operation: Up to 2.5MHz
  • Wide Input Voltage Range: 2.5V to 24V
  • Low Shutdown Current: ICC < 1μA
  • Overtemperature Protection
  • Available in (5mm × 3mm × 0.75mm) 16-Pin DFN and 16-Pin Thermally Enhanced TSSOP Packages
Typical Application

Applications
  • Notebook PC Display
  • LED Camera Light for Cell Phones
  • Car Dashboard Lighting
  • Avionics Displays
Packaging

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3486EDHC#PBF5x3 DFN-16E$3.57$2.50
LT3486EDHC#TRPBF5x3 DFN-16E$2.60
LT3486EFE#PBFTSSOP-16E$3.71$2.60
LT3486EFE#TRPBFTSSOP-16E$2.72
LT3486IFE#PBFTSSOP-16I$4.46$3.12
LT3486IFE#TRPBFTSSOP-16I$3.18
Demo Boards
Part NumberDescriptionPrice
DC876ALT3486EFE Demo Board | Dual Boost LED Driver, 3V ≤ VIN ≤ 25V, VLED up to 36V @ 100mA (x2)$100.00
Datasheet
Reliability Data
LT Journal
Press Release
LTspice
Related Product
LT3486 - Dual 1.3A White LED Step-Up Converters with Wide Dimming Range
LT3486 Package Drawing LT3486
R458 Reliability Data
June 2006 Dual Step-Up Converter Drives White LEDs with 1000:1 PWM Dimming
Dual 1.3A White LED Step-Up Converters Drive 16 100mA LEDs with 1000:1 Dimming Ratio
LT3486 Footprints and Symbols
LT3486 Demo Circuit - Dual 1.3A White LED Step-Up Converter (5V to 6x 2.4V LEDs @ 100mA)