MP3021 – 1X, 1.5X, 2X AUTO-ADJUST CHARGE PUMP WLED BACKLIGHT DRIVER

MP3021 Rev. 1.0

www.MonolithicPower.com

4

11/21/2007

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2007 MPS. All Rights Reserved.

TYPICAL PERFORMANCE CHARACTERISTICS

100

90

80

70

60

50

40

30

20

2.5

3.0

3.5

4.0

4.5

BATTERY VOLTAGE (V)

Efficiency vs

Battery Voltage

I_LED=30mA

I_LED=20mA

I_LED=10mA

2.50

3.50

4.50

5.50

60

40

20

0

-20

-40

LED Current Deviation (LC)

vs Battery Voltage

1.00

0.50

0.00

-0.50

-1.00

2.50

3.50

4.50

5.50

BATTERY VOLTAGE (V)

BATTERY VOLTAGE (V)

LED Current Deviation (HC)

vs Battery Voltage

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0

BRIGHT LEVEL

LED Current (LC) Over

32 Brightness Levels

35

30

25

20

15

10

5

0

0

5

10

15

20

25

30

BRIGHT LEVEL

LED Current (HC) Over

32 Brightness Levels

0

5

10

15

20

25

30

LED3

LED3

LED1

LED4

LED2

LED2

LED1

LED4

100

90

80

70

60

50

40

30

20

10

2.5 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5

BATTERY VOLTAGE (V)

Efficiency with Different

LED Voltage

VF=3.4V

VF=3.3V

VF=3.2V

I_LED=20mA