High-Efficiency, 26V Step-Up Converters
for Two to Six White LEDs
Typical Operating Characteristics
(Circuit of Figure 1, V IN = 3.6V, I LED = 15mA, L1 = 22μH, C IN = 2.2μF, C OUT = 0.1μF, C COMP = 0.1μF, R SENSE = 7.5 ? , 4 LEDs,
T A = +25°C, unless otherwise noted.)
100
MAX1561
EFFICIENCY vs. LED CURRENT
(vs. NUMBER of LEDs)
100
MAX1561
EFFICIENCY vs. LED CURRENT
(vs. INPUT VOLTAGE)
100
MAX1561
EFFICIENCY vs. LED CURRENT
(vs. INDUCTANCE)
90
6 LEDs
90
2.7V IN
90
10 μ H
22 μ H
80
80
80
70
60
4 LEDs
2 LEDs
70
60
4.2V IN
3.6V IN
70
60
47 μ H
4.7 μ H
50
40
50
40
50
40
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
100
LED CURRENT (mA)
MAX1599 EFFICIENCY vs. LED CURRENT
(vs. NUMBER OF LEDs)
100
LED CURRENT (mA)
MAX1599 EFFICIENCY vs. LED CURRENT
(vs. INPUT VOLTAGE)
100
LED CURRENT (mA)
MAX1599 EFFICIENCY vs. LED CURRENT
(vs. INDUCTANCE)
47 μ H
90
80
6 LEDs
90
80
90
80
22 μ H
70
60
50
40
4 LEDs
2 LEDs
70
60
50
40
4.2V IN
2.7V IN
3.6V IN
70
60
50
40
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
40
35
LED CURRENT (mA)
INPUT RIPPLE vs. INDUCTANCE
6
5
LED CURRENT (mA)
INPUT RIPPLE SPECTRUM
25
20
LED CURRENT (mA)
LED CURRENT vs. DIRECT-PWM
DIMMING DUTY CYCLE
30
4
25
20
3
15
15
2
10
10
5
0
1
0
5
0
V CTRL = SQUARE WAVE
200Hz < FREQ < 200kHz
0
5
10 15 20 25 30 35 40 45 50
0
1
2
3
4
5
6
7
8
9
10
0
10 20 30 40 50 60 70 80 90 100
INDUCTANCE ( μ H)
FREQUENCY (MHz)
DIRECT-PWM DIMMING DUTY CYCLE (%)
4
_______________________________________________________________________________________
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