MAX8647 查看數據表（PDF） - Maxim Integrated
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MAX8647 Datasheet PDF : 15 Pages
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Ultra-Efficient Charge Pumps for
Six White/RGB LEDs in 3mm x 3mm Thin QFN
Typical Operating Characteristics (continued)
(VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX LEDs)
100
90
80
70
60
20.8mA/LED
50
6.4mA/LED
40
30
20
10
LEDs HAVE MISMATCHED VF
0
2.7 3.0 3.3 3.6 3.9 4.2
INPUT VOLTAGE (V)
INPUT CURRENT vs. INPUT VOLTAGE
(DRIVING SIX LEDs)
200
180
ILED = 20.8mA
160
140
120
100 ILED = 16mA
80 LEDs HAVE MISMATCHED VF
60
ILED = 6.4mA
40
20
ILED = 1.6mA
0
2.7
3.2
3.7
4.2
INPUT VOLTAGE (V)
INPUT CURRENT vs. Li+ BATTERY
VOLTAGE (RGB MODULE)
100
RGB MODULE: LUMEX SML-LX3632SISUGSBC
90
80
20.8mA/LED
70
16mA/LED
60
50
40
30
6.4mA/LED
20
10
1.6mA/LED
0
4.2 3.9 3.8 3.7 3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(DRIVING SIX LEDs)
100
16mA/LED
90
80
70
1.6mA/LED
60
50
LEDs HAVE MISMATCHED VF
40
4.2 3.9 3.8 3.7 3.6
3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT CURRENT vs. Li+ BATTERY
VOLTAGE (DRIVING SIX LEDs)
200
LEDs HAVE MISMATCHED VF
180
160
140
20.8mA/LED
120
16mA/LED
100
80
60
6.4mA/LED
40
20
1.6mA/LED
0
4.2 3.9
3.8 3.7
3.6 3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE (DRIVING SIX WHITE LEDs)
16
20.8mA/LED
14
12 16mA/LED
10
8
6.4mA/LED
6
4
LEDs HAVE
MISMATCHED VF
2
1.6mA/LED
0
2.7
3.2
3.7
4.2
SUPPLY VOLTAGE (V)
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(DRIVING SIX LEDs)
100
90
80
6.4mA/LED
70
60
20.8mA/LED
50
LEDs HAVE MISMATCHED VF
40
4.2 3.9 3.8 3.7 3.6
3.5 3.4 3.0
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
INPUT CURRENT
vs. INPUT VOLTAGE (RGB MODULE)
100
RGB MODULE: LUMEX SML-LX3632SISUGSBC
90
80
ILED = 20.8mA
70
60
ILED = 16mA
50
40
30
ILED = 4.8mA
20
10
ILED = 1.6mA
0
2.7
3.2
3.7
4.2
INPUT VOLTAGE (V)
LED CURRENT MATCHING
vs. INPUT VOLTAGE (16mA/LED)
17.0
16.8
16.6
16.4
16.2
16.0
15.8
15.6
15.4
15.2
15.0
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
_______________________________________________________________________________________ 5
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