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LT3590
PIN FUNCTIONS
(SC70/DFN)
I LED = IN LED
SW (Pin 1/Pin 3): Switch Pin. Minimize trace area at this
pin to minimize EMI. Connect the inductor at this pin.
GND (Pins 2, 3, 4/Pin 2): Ground Pins. All ground pins
should be tied directly to local ground plane. Proper
soldering of these pins to the PCB ground is required to
achieve the rated thermal performance.
CTRL (Pin 5/Pin 1): Dimming and Shutdown Pin.
Connect it below 100mV to disable the switcher. As the
pin voltage is ramped from 0V to 1.5V, the feedback volt-
age (V IN - V LED ) ramps from 0mV to 200mV, controlling
the LBD current.
V ? V
R 1
BLOCK DIAGRAM
V IN
48V
C1
1μF
VREG (Pin 6/Pin 6): Internally Generated 3.3V Regulated
Output Pin. Must be locally bypassed with a 0.1μF X5R
capacitor.
LED (Pin 7/Pin 5): Connection point for the anode of the
highest LED and the sense resistor.
V IN (Pin 8/Pin 4): Input Supply Pin. Must be locally by-
passed.
Exposed Pad (NA/Pin 7): Ground. The Exposed Pad
should be soldered to the PCB ground to achieve the
rated thermal performance.
V IN
R1
6.8Ω
+
REG
–
A = 6.25
LED
C3
0.1μF
VREG
VREF
1.25V
START-UP
EAMP
+
+
–
L1
C2
1μF
CONTROL
SW
470μH
V OUT
PWM
R
S
Q
+
∑
ISNS
–
RAMP
GENERATOR
850kHz
OSCILLATOR
CONTROL
CTRL
GND
3590 F01
Figure 1. Block Diagram
3590f
6
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