SP6648 Datasheet, PDF (13/16 Pages) Sipex Corporation – Ultra-low Quiescent Current, High Efficiency Boost Regulator

APPLICATIONS INFORMATION
VOUT
VREF
V_OUT
V_REF
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 10K
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
V_BATT 1
LBI 2
LBON 3
R_LIM 4
SHDN 5
SP6648
10 Pin MSOP
10 V_OUT
9 _LX
8 _PGNDV
7 _GND
6 _FB
Date: 7/19/04
SP6648 Ultra-low Quiescent Current, High Efficiency Boost Regulator
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© Copyright 2004 Sipex Corporation