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APPLICATION INFORMATION
Configuring as Cellphone Camera
Flash Driver
SP6683 is capable of delivering up to 200mA
current, which is perfect to drive the most
common LEDs in today's market. It is
Configuring as Camera Flash + Torch Driver
The SP6683 can be configured as a flash/
torch LED driver which in some applications
require constant torch current used for mo-
tion pictures (i.e. movie mode).
V IN
designed to work in the cell phone camera
flash which powers up directly from the
Lithium-Ion battery.
C2
1uF
6.3V/0603 1 Vout C2P 10
2 C1P
C1N 9
C3
1uF
SP6683
6.3V/0603
Io=Vfb/Rb
3.0 - 4.2V
Lithium
Ion
C2
1 μ F
C1
2.2 μ F
1 V OUT
2 C1P
3
4
V MODE
5
FB
?
C2P
SP6683 C1N
GND
C2N
EN/PWM
R1
1M ?
10
9
8
7
6
C4
1 μ F
C5
2.2 μ F
R2
1M ?
D1
White
LED
R B2
R B1
3 Vin
GND 8
LED1
Vin
2.7V~4.2V
4 Vmode
C2N 7
C4
2.2uF
6.3V/0603
ENABLE
FLASH
C1
2.2uF
6.3V/0603
5 FB
EN/PWM 6
EN/PWM
Rb
1.5 ohm
1% / 0603
Camera Flash/Torch Application
400
350
300
Flash Mode
Torch Mode
250
200
Camera Flash Application
150
100
Configuring as LCD Backlight
50
Torch Mode: Vf=3.2V , Enable = High, FLASH = Low.
Flash Mode: Vf=3.3V, Enable = High, FLASH = High.
The SP6683 is able to efficiently drive up to
0
3.2
3.4
3.6
Vin (V)
3.8
4.0
4.2
eight 20mA white LEDs in parallel and
maintain a constant brightness over a very
wide operating voltage range (2.7V to 5.5V)
Figure 13. I OUT vs. V IN
Programming X1 or X1.5 Operating Mode
?
C5
For simplest application circuitry, SP6683's
mode can be fixed by connecting V MODE to V IN
V IN
2.7-
4.2V
Lithium
-Ion
C2
1 μ F
C1
1
2
3
4
5
V OUT
C1P
V IN
V MODE
FB
SP6683
C2P
C1N
GND
C2N
EN/PWM
10
9
8
7
6
1 μ F
C4
1 μ F
White
LED
for X1 mode or connecting V MODE to GND for
X1.5 mode. The SP6683 can automatically
change from X1 mode to X1.5 to maximize
efficiency. To use this feature, divider resistors
should be chosen according to the specific ap-
plication, as shown below.
3
V IN
1 μ F
R1
4
SP6683
R6
20
20
R2
V MODE
C2
GND
8
ENABLE
LCD Backlight Application
Programming the Vmode Resistors
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
7
? Copyright 2006 Sipex Corporation
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