MAX8648 Maxim Integrated Products, MAX8648 Datasheet - Page 5

• Manufacturer Part Number: MAX8648
• Description: (MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
• Manufacturer: Maxim Integrated Products

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