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LT3475/LT3475-1
TYPICAL PERFOR A CE CHARACTERISTICS
Open-Circuit Output Voltage and
Boost Pin Current
Quiescent Current
Input Current
35
30
T A = 25°C
7
6
T A = 25°C
50
45
40
T A = 25°C
INPUT CURRENT
LT3475-1
14
12
25
5
35
10
20
15
10
5
4
3
2
1
30
25
20
15
10
5
LT3475
LT3475-1
OUTPUT VOLTAGE
LT3475
8
6
4
2
0
0
0.5
1.0
1.5
2.0
0
0
10
20
30
40
0
0
10
20
30
40
0
SWITCH CURRENT (A)
Reference Voltage
3475 G10
V IN (V)
3475 G11
Minimum Input Voltage, Single
1.5A White LED
V IN (V)
3475 G12
Minimum Input Voltage, Two Series
Connected 1.5A White LEDs
1.28
1.27
6
5
T A = 25°C
TO START
10
9
T A = 25°C
1.26
4
TO RUN
LED VOLTAGE
8
TO START
1.25
3
7
LED VOLTAGE
1.24
1.23
2
1
6
TO RUN
1.22
–50 –25
0
25
50
75
100
125
0
0
0.5 1
1.5
5
0
0.5 1
1.5
TEMPERATURE (?C)
PI FU CTIO S
3475 G13
LED CURRENT (A)
3475 G14
LED CURRENT (A)
3475 G15
OUT1, OUT2 (Pins 1, 10): The OUT pin is the input to the
current sense resistor. Connect this pin to the inductor
and the output capacitor.
LED1, LED2 (Pins 2, 9): The LED pin is the output of
the current sense resistor. Connect the anode of the LED
here.
V IN (Pins 5, 6): The V IN pins supply current to the internal
circuitry and to the internal power switches and must be
locally bypassed.
BOOST1, BOOST2 (Pins 3, 8): The BOOST pin is used to
provide a drive voltage, higher than the input voltage, to
the internal bipolar NPN power switch.
GND (Pins 15, Exposed Pad Pin 21): Ground. Tie the GND
pin and the exposed pad directly to the ground plane. The
exposed pad metal of the package provides both electrical
contact to ground and good thermal contact to the printed
circuit board. The exposed pad must be soldered to the
circuit board for proper operation. Use a large ground plane
and thermal vias to optimize thermal performance.
SW1, SW2 (Pins 4, 7): The SW pin is the output of the
internal power switch. Connect this pin to the inductor,
switching diode and boost capacitor.
3475fb
5
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