MAX8645X datasheet(5/15 Pages) MAXIM

Part #	MAX8645X

Description	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN

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Manufacturer	MAXIM [Maxim Integrated Products]

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1x/1.5x/2x White LED Charge Pumps with

Two LDOs in 4mm x 4mm TQFN

_______________________________________________________________________________________

5

BATTERY CURRENT vs. SUPPLY

VOLTAGE DRIVING FLASH

SUPPLY VOLTAGE (V)

3.9

3.6

3.3

3.0

100

200

300

400

500

600

700

800

900

0

2.7

4.2

IFLASH = 400mA

IFLASH = 160mA

IFLASH = 80mA

LDO GROUND-PIN SUPPLY

CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5.1

4.7

3.9

4.3

3.5

3.1

90

100

110

120

130

140

150

160

80

2.7

5.5

VENM_ = VENF = 0V, VENLDO = VIN

150mA, BOTH LDOs

NO LOAD, BOTH LDOs

INPUT RIPPLE VOLTAGE vs. SUPPLY

VOLTAGE WITH SIX MAIN LEDs

SUPPLY VOLTAGE (V)

5.1

4.7

4.3

3.9

3.5

3.1

0.3

0.6

0.9

1.2

1.5

1.8

0

2.7

5.5

ILED = 15mA

ILED = 4.5mA

ILED = 1.5mA

INPUT RIPPLE VOLTAGE vs. SUPPLY

VOLTAGE WITH FLASH AND MAIN LEDs

SUPPLY VOLTAGE (V)

5.1

4.7

3.1

3.5

3.9

4.3

1

2

3

4

5

7

9

6

8

10

0

2.7

5.5

FOUR MAIN LEDs AT 15mA EACH

IFLASH = 40mA

IFLASH = 160mA

IFLASH = 400mA

LED CURRENT MATCHING vs. SUPPLY

VOLTAGE WITH SIX MAIN LEDs

SUPPLY VOLTAGE (V)

5.1

4.7

3.9

4.3

3.5

3.1

14.2

14.4

14.6

14.8

15.0

15.2

15.4

15.6

15.8

16.0

14.0

2.7

5.5

LED CURRENT MATCHING vs. SUPPLY

VOLTAGE WITH TWO FLASH LEDs

SUPPLY VOLTAGE (V)

5.1

4.7

4.3

3.9

3.5

3.1

99.0

98.5

99.5

100.0

100.5

101.0

101.5

102.0

98.0

2.7

5.5

LED CURRENT vs. AMBIENT

TEMPERATURE WITH SIX MAIN LEDs

TA (

°C)

60

35

10

-15

15

30

45

60

75

90

105

0

-40

85

LED CURRENT vs. AMBIENT

TEMPERATURE WITH FLASH

TA (

°C)

60

35

10

-15

50

100

150

200

250

300

350

400

450

0

-40

85

INDIVIDUAL MAIN LED CURRENT

vs. RSETM

RSETM (k

Ω)

10

100

1

100

1

Typical Operating Characteristics (continued)

(VIN = VEN_ = 3.6V, circuit of Figure 2, TA = +25°C, unless otherwise noted.)

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Maxim Integrated Produc...	MAX8645X	257Kb / 14P	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN Rev 4; 6/08
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Manufacturer	Part #	Datasheet	Description
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