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LT3590
48V Buck Mode
LED Driver in SC70
and 2mm x 2mm DFN
FEATURES
DESCRIPTION
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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% Ef?ciency (10 LEDs, 50mA)
Requires Only 1μF Output Capacitor
8-Lead SC70 Package
6-Lead 2mm × 2mm DFN Package
The LT ? 3590 is a ?xed frequency buck mode converter
speci?cally 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 ?xed 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 pro?le 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
APPLICATIONS
converter footprint and lower parts cost.
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LED Fixed Signage
Traf?c Signs
Neon Sign Replacement
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
V IN
48V
Buck Mode Driver for Ten White LEDs
1μF
50mA
4 Ω
100
90
80
Conversion Ef?ciency
CONTROL
1μF
V IN
CTRL
LED
470μH
70
60
LT3590
VREG
SW
3590 TA01a
50
0.1μF
GND
40
0
10
20
30
40
50
LED CURRENT (mA)
3590 TA01b
3590f
1
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