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Date: 6/7/06 Rev B

SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

© 2006 Sipex Corporation

Brightness Control

One approach to control LED brightness is to

apply a PWM signal to the SHDN input of the

SP6648. In this case, the output current will be

equal to the product of 350mA and the average

duty cycle at the SHDN pin. An optional 10K

Ω

ming the LED current by varying the potentiom-

eter between low brightness and full brightness.

APPLICATIONS INFORMATION

Plug in the LumiLED

Unplug the LumiLED

PINOUTS

SP6648

10 Pin DFN

10

9

8

7

6

1

2

3

4

5

VBATT

LBI

LBON

RLIM

SHDN

V

OUT

LX

P

GND

GND

FB

LBI

LBON

SHDN

SP6648

10 Pin MSOP

1

2

3

4

5

10

9

8

7

6

LX

GND

FB