SP6648 查看數據表（PDF） - Signal Processing Technologies

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SP6648

Ultra-low Quiescent Current, High Efficiency Boost Regulator

Signal Processing Technologies 

APPLICATIONS INFORMATION

VOUT

VREF

VOUT

VREF

Plug in the LumiLED

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 10KΩ

potentiometer (R5) may also be used for dim-

ming the LED current by varying the potentiom-

eter between low brightness and full brightness.

Unplug the LumiLED

PINOUTS

VBATT 1

LBI 2

LBON 3

RLIM 4

SHDN 5

SP6648

10 Pin DFN

10 VOUT

9 LX

8 PGND

7 GND

6 FB

VBATT 1

LBI 2

LBON 3

RLIM 4

SHDN 5

SP6648

10 Pin MSOP

10 VOUT

9 LX

8 PGNDV

7 GND

6 FB

Date: 6/7/06 Rev B

SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator

13

© 2006 Sipex Corporation

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