MAX8647ETE+ datasheet(5/15 Pages) MAXIM

Part #	MAX8647ETE+

Description	Ultra-Efficient Charge Pumps for Six White/RGB LEDs in 3mm x 3mm Thin QFN

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Manufacturer	MAXIM [Maxim Integrated Products]

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Ultra-Efficient Charge Pumps for

Six White/RGB LEDs in 3mm x 3mm Thin QFN

_______________________________________________________________________________________

5

EFFICIENCY vs. SUPPLY VOLTAGE

(DRIVING SIX LEDs)

INPUT VOLTAGE (V)

3.9

3.6

3.3

3.0

10

20

30

40

50

60

70

80

90

100

0

2.7

4.2

6.4mA/LED

20.8mA/LED

LEDs HAVE MISMATCHED VF

EFFICIENCY vs. Li+ BATTERY VOLTAGE

(DRIVING SIX LEDs)

Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)

3.4

3.5

3.6

3.7

3.8

3.9

50

60

70

80

90

100

40

4.2

3.0

1.6mA/LED

16mA/LED

LEDs HAVE MISMATCHED VF

EFFICIENCY vs. Li+ BATTERY VOLTAGE

(DRIVING SIX LEDs)

Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)

3.4

3.5

3.6

3.7

3.8

3.9

50

60

70

80

90

100

40

4.2

3.0

6.4mA/LED

20.8mA/LED

LEDs HAVE MISMATCHED VF

INPUT CURRENT vs. INPUT VOLTAGE

(DRIVING SIX LEDs)

INPUT VOLTAGE (V)

3.7

3.2

20

40

60

80

100

120

140

160

180

200

0

2.7

4.2

LEDs HAVE MISMATCHED VF

ILED = 16mA

ILED = 20.8mA

ILED = 6.4mA

ILED = 1.6mA

INPUT CURRENT vs. Li+ BATTERY

VOLTAGE (DRIVING SIX LEDs)

Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)

3.5

3.6

3.4

3.7

3.8

3.9

20

40

60

80

100

120

140

160

180

200

0

4.2

3.0

1.6mA/LED

6.4mA/LED

16mA/LED

20.8mA/LED

LEDs HAVE MISMATCHED VF

INPUT CURRENT

vs. INPUT VOLTAGE (RGB MODULE)

INPUT VOLTAGE (V)

3.7

3.2

10

20

30

40

50

60

70

80

90

100

0

2.7

4.2

ILED = 20.8mA

ILED = 16mA

ILED = 4.8mA

ILED = 1.6mA

RGB MODULE: LUMEX SML-LX3632SISUGSBC

INPUT CURRENT vs. Li+ BATTERY

VOLTAGE (RGB MODULE)

Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)

3.5

3.6

3.4

3.7

3.8

3.9

10

20

30

40

50

60

70

80

90

100

0

4.2

3.0

1.6mA/LED

6.4mA/LED

16mA/LED

20.8mA/LED

RGB MODULE: LUMEX SML-LX3632SISUGSBC

INPUT RIPPLE VOLTAGE vs. SUPPLY

VOLTAGE (DRIVING SIX WHITE LEDs)

SUPPLY VOLTAGE (V)

3.7

3.2

2

4

6

8

10

12

14

16

0

2.7

4.2

20.8mA/LED

16mA/LED

6.4mA/LED

1.6mA/LED

LEDs HAVE

MISMATCHED VF

15.0

15.6

15.4

15.2

16.0

15.8

16.8

16.6

16.4

16.2

17.0

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

LED CURRENT MATCHING

vs. INPUT VOLTAGE (16mA/LED)

INPUT VOLTAGE (V)

Typical Operating Characteristics (continued)

(VIN = 3.6V, VEN_ = VIN, circuit of Figure 1, TA = +25°C, unless otherwise noted.)

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