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PIN DESCRIPTION
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
PIN NAME
V OUT
C1P
V IN
V MODE
FB
EN/PWM
C2N
GND
C1N
C2P
DESCRIPTION
Regulated charge pump output.
Positive terminal to the charge pump flying capacitor C2.
Input supply voltage.
Charge pump mode program pin. When V MODE is greater than 1.25V,
a X1 charge pump is used. Otherwise, charge pump switches to X1.5
mode. A voltage divider shown in the typical application circuit
programs the V IN threshold for charge pump mode switching.
This is the feedback pin for output current or voltage regulation. The
voltage of this pin is compared with an internal 315mV reference.
Enable and PWM dimming control input. Pull this pin low to discon-
nect V OUT from V IN and shutdown the SP6683.V OUT is pulled to
ground in shutdown.
Negative terminal to the charge pump flying capacitor, C4.
Ground reference.
Negative terminal to the charge pump flying capacitor, C2.
Positive terminal to the charge pump flying capacitor C4.
FUNCTIONAL DIAGRAM
V IN
EN/PWM
V MODE
1.25V
MODE
COMP
Voltage
Reference
1.2 MHz
Clock
Manager
Mode Control
Start-up
and
Charge
Pump
Switches
C1P
C1N
C2P
C2N
V OUT
315mV
V OUT
FB
COMP
GND
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
3
? Copyright 2006 Sipex Corporation
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