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Linear Technology Electronic Components Datasheet

LT3590 Datasheet

48V Buck Mode LED Driver

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FEATURES
4.5V to 55V Input Voltage Range
Up to 50mA LED Current
80mA, 55V Switch
Internal Schottky Diode
15μA Supply Current in Shutdown
500μA Supply Current Operating, Not Switching
Switching Frequency: 850kHz
200mV Feedback Voltage with ±5% Accuracy
CTRL Input Performs Dimming and Shutdown
91% Efficiency (10 LEDs, 50mA)
Requires Only 1μF Output Capacitor
8-Lead SC70 Package
6-Lead 2mm × 2mm DFN Package
APPLICATIONS
LED Fixed Signage
Traffic Signs
Neon Sign Replacement
LT3590
48V Buck Mode
LED Driver in SC70
and 2mm x 2mm DFN
DESCRIPTION
The LT®3590 is a fixed frequency buck mode converter
specifically designed to drive up to 10 LEDs in series from
a 48V DC source. Series connection of the LEDs provides
identical LED currents of up to 50mA, resulting in uniform
brightness and eliminating the need for ballast resistors.
A fixed frequency, current mode architecture results in
stable operation over a wide range of input voltage and
output voltage.
The high switching frequency of 850kHz permits the use
of tiny, low profile inductors and capacitors. A single pin
performs both shutdown and accurate LED dimming
control. The power switch, Schottky diode and control
circuitry are all contained inside a space saving SC70
package or 2mm × 2mm DFN package to allow a small
converter footprint and lower parts cost.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN
48V
CONTROL
Buck Mode Driver for Ten White LEDs
1μF
50mA
1μF
0.1μF
VIN LED
CTRL
LT3590
VREG
SW
GND
470μH
3590 TA01a
Conversion Efficiency
100
90
80
70
60
50
40
0 10 20 30 40 50
LED CURRENT (mA)
3590 TA01b
3590f
1


Linear Technology Electronic Components Datasheet

LT3590 Datasheet

48V Buck Mode LED Driver

No Preview Available !

LT3590www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN)..................................... –0.3V to 55V
LED Voltage ............................................... –0.3V to 55V
CTRL Voltage ................................................. 0V to 6.0V
VREG Voltage................................................. 0V to 4.0V
Operating Junction Temperature Range
(Note 2) ...............................................– 40°C to 85°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
SC 8 Package Only............................................ 300°C
PIN CONFIGURATION
TOP VIEW
CTRL 1
6 VREG
GND 2
7 5 LED
SW 3
4 VIN
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 65°C/W TO 85°C/W, θJC = 20°C/W
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
SW 1
GND 2
GND 3
GND 4
8 VIN
7 LED
6 VREG
5 CTRL
SC8 PACKAGE
8-LEAD PLASTIC SC70
TJMAX = 125°C, θJA = 75°C/W TO 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3590EDC#PBF
LT3590EDC#TRPBF LCNZ
6-Lead (2mm × 2mm) Plastic DFN
LT3590ESC8#PBF
LT3590ESC8#TRPBF LCPB
8-Lead Plastic SC70
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
3590f
2


Part Number LT3590
Description 48V Buck Mode LED Driver
Maker Linear Technology
PDF Download

LT3590 Datasheet PDF






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