White LED Camera-Flash
Boost Converter
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V EN1 = 3.0V, V EN2 = 0V, V OUT = 20V, C OUT = 10μF, T A = -40°C to +85°C, unless otherwise noted. Typical values are at
T A = +25 ° C. Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
EN1 and EN2 Input High Threshold
EN1 and EN2 Input Low Threshold
V IN = 2.6V to 5.5V
V IN = 2.6V to 5.5V
1.6
0.6
V
V
EN1 and EN2 Input Leakage
LX On-Resistance
LX Leakage
Operating Frequency
Maximum Duty Cycle
Minimum Duty Cycle
EN_ = IN
I LX = 200mA
V LX = 28V
T A = 0 ° C to +85 ° C
T A = -40 ° C to +85 ° C
Switching
Pulse skipping
T A = +25 ° C
T A = +85 ° C
T A = +25 ° C
T A = +85 ° C
0.8
0.75
90
0.01
0.1
1.3
0.01
0.1
1.0
94
0
1
2.25
5
1.2
1.25
μA
Ω
μA
MHz
%
%
Note 1: All units are 100% production tested at T A = +25 ° C. Limits over the operating temperature range are guaranteed by design.
Typical Operating Characteristics
(V IN = 3.3V, C RES = 10μF, MAX1583Y, 4 LEDs in a 2 x 2 array, T A = +25 ° C, unless otherwise noted.)
EFFICIENCY vs. INPUT VOLTAGE
(MOVIE MODE)
MAXIMUM BOOST OUTPUT CURRENT
vs. INPUT VOLTAGE (MAX1583X)
MAXIMUM BOOST OUTPUT CURRENT
vs. INPUT VOLTAGE (MAX1583Y)
90
C
700
A: 1 LED
600
A: 1 LED
80
70
60
50
40
30
20
10
0
A: MAX1583X
B: MAX1583Y
C: MAX1583Z
B
A
I LOAD = 30mA
600
500
400
300
200
100
0
B: 2 LEDs
C: 3 LEDs
D: 4 LEDs
A
B
C
D
500
400
300
200
100
0
B: 2 LEDs
C: 3 LEDs
D: 4 LEDs
A
B
C
D
3.0
3.3
3.6
3.9
4.2
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
V IN (V)
V IN (V)
_______________________________________________________________________________________
3
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