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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
Typical Operating Characteristics (continued)
(V IN = 3.6V, V EN_ = V IN , circuit of Figure 1, T A = +25°C, unless otherwise noted.)
100
90
80
EFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX LEDs)
100
90
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(DRIVING SIX LEDs)
16mA/LED
100
90
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(DRIVING SIX LEDs)
70
60
50
40
6.4mA/LED
20.8mA/LED
80
70
1.6mA/LED
80
70
6.4mA/LED
20.8mA/LED
30
20
60
50
60
50
10
0
LEDs HAVE MISMATCHED V F
40
LEDs HAVE MISMATCHED V F
40
LEDs HAVE MISMATCHED V F
2.7
3.0
3.3
3.6
3.9
4.2
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
INPUT VOLTAGE (V)
INPUT CURRENT vs. INPUT VOLTAGE
(DRIVING SIX LEDs)
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT CURRENT vs. Li+ BATTERY
VOLTAGE (DRIVING SIX LEDs)
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT CURRENT
vs. INPUT VOLTAGE (RGB MODULE)
200
180
160
140
120
100
80
60
40
20
I LED = 20.8mA
I LED = 16mA
LEDs HAVE MISMATCHED V F
I LED = 6.4mA
I LED = 1.6mA
200
180
160
140
120
100
80
60
40
20
LEDs HAVE MISMATCHED V F
20.8mA/LED
16mA/LED
6.4mA/LED
1.6mA/LED
100
90
80
70
60
50
40
30
20
10
RGB MODULE: LUMEX SML-LX3632SISUGSBC
I LED = 20.8mA
I LED = 16mA
I LED = 4.8mA
I LED = 1.6mA
0
0
0
2.7
3.2
3.7
4.2
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
2.7
3.2
3.7
4.2
INPUT VOLTAGE (V)
INPUT CURRENT vs. Li+ BATTERY
VOLTAGE (RGB MODULE)
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE (DRIVING SIX WHITE LEDs)
INPUT VOLTAGE (V)
LED CURRENT MATCHING
vs. INPUT VOLTAGE (16mA/LED)
100
90
80
70
60
50
RGB MODULE: LUMEX SML-LX3632SISUGSBC
20.8mA/LED
16mA/LED
16
14
12
10
8
20.8mA/LED
16mA/LED
17.0
16.8
16.6
16.4
16.2
16.0
40
30
20
10
0
6.4mA/LED
1.6mA/LED
6
4
2
0
6.4mA/LED
1.6mA/LED
LEDs HAVE
MISMATCHED V F
15.8
15.6
15.4
15.2
15.0
4.2 3.9
3.8
3.7
3.6
3.5 3.4 3.0
2.7
3.2
3.7
4.2
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
SUPPLY VOLTAGE (V)
INPUT VOLTAGE (V)
_______________________________________________________________________________________
5
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