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White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
Typical Operating Characteristics
(V IN = 3.6V, EN1 = EN2 = IN, C IN = C1 = C2 = C OUT = 1μF, R SET = 7.50k Ω , T A = +25°C, unless otherwise noted.)
EFFICIENCY (P LEDs /P BATT )
vs. Li+ BATTERY DISCHARGE
EFFICIENCY (P LEDs /P BATT )
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
100
90
80
FULL
3/10
100
90
80
1/10
3/10
FULL
120
100
80
FULL
70
1/10
70
60
40
60
50
60
50
20
0
1/10
3/10
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
3.0
3.2
3.4
3.6
3.8
4.0
4.2
3.0
3.2
3.4
3.6
3.8
4.0
4.2
9
Li+ BATTERY VOLTAGE, TIME-WEIGHTED (V)
INPUT RIPPLE vs. SUPPLY VOLTAGE
20
SUPPLY VOLTAGE (V)
LED CURRENT vs. SUPPLY VOLTAGE
17.5
SUPPLY VOLTAGE (V)
LED CURRENT vs. TEMPERATURE
8
FULL
19
LED4
LED2
17.4
7
6
18
17
17.3
17.2
5
4
3
2
1
0
3/10
1/10
16
15
14
13
12
11
10
LED3
LED1
17.1
17.0
16.9
16.8
16.7
16.6
16.5
3.0
3.2
3.4
3.6
3.8
4.0
4.2
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TYPICAL OPERATING WAVEFORMS
TEMPERATURE ( ° C)
TYPICAL OPERATING WAVEFORMS
30
LED CURRENT vs. R SET
IN 1x MODE
MAX1573 toc08
IN 1.5x MODE
MAX1573 toc09
25
V IN
3.6V Li+ BATTERY INPUT
20mV/
div
V IN
3.4V Li+ BATTERY INPUT
20mV/
div
20
15
3 /10
F UL L
I IN
10mA/
div
I IN
10mA/
div
10
5
1 /10
V OUT
20mV/
div
V OUT
20mV/
div
0
5
6
7
8
9
10 11 12 13 14 15
500ns/div
500ns/div
R SET (k Ω )
_______________________________________________________________________________________
3
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