SP6683
1X/1.5X High Efficiency Charge Pump
LED Driver for Flash or Backlight
FEATURES
V
OUT
1
10
C2P
■
Output Current up to 200mA
■
Ideal for White LED driver in CellPhone Flash
C1P
2
SP6683
9
C1N
■
0.5µA Shutdown Current
8
GND
V
IN
3
■
1x/1.5x Mode Charge Pump
10 Pin DFN
■
+2.7V to +5.5V Input Voltage Range
7
C2N
V
MODE
4
■
Built-in 1.2MHz Oscillator
6
EN/PWM
FB
5
■
0.5mA Quiescent Current
■
Over Temperature Protection
Now Available in Lead Free Packaging
■
Shorted LED Protection
■
Programmable Output Current or Voltage
APPLICATIONS
■
PWM Dimming Control via Enable Pin
■
Mobile Phone
■
Soft Start to limit In-Rush Current
■
Camera Flash Driver
■
Space Saving 10-pin 3 x 3mm DFN Package
■
PDA
■
Three Options for Optimizing Efficiency:
■
Digital Still Camera
■
SP6683 - MOSFET discharge in shutdown
■
Digital Camcorder
■
SP6683-03 - High Impedance in shutdown
■
Color LCD Module
■
SP6683-LV - Low Voltage (150mV)V
FB
Reference
DESCRIPTION
The SP6683 is a high power current regulated charge pump ideal for converting a Li-Ion
battery input for driving up to 8 white LED’s used in backlighting color displays. The SP6683
operates with an internal 1.2MHz clock, enabling the use of small external components.
Output current can be accurately regulated by modulating the switcher between the charge
pump and output capacitor. In shutdown mode, the SP6683 discharges the output to ground
and draws less than 500nA current. Offered in 10-pin DFN package, the SP6683 family
includes three options that allow the user to optimize LED driving circuit; SP6683-LV with low
voltage reference, SP6683-03 with high impedance output in shutdown, and SP6683 with
pulled down output in shutdown.
TYPICAL APPLICATION SCHEMATIC
C2
1uF
6.3V/0603
1 Vout
2 C1P
3 Vin
C2P 10
C1N 9
C3
1uF
6.3V/0603
LED1
C4
2.2uF
6.3V/0603
SP6683
GND 8
C2N 7
Vin
2.7V~4.2V
C1
2.2uF
6.3V/0603
Io=Vfb/Rb
4 Vmode
5 FB
EN/PWM 6
EN/PWM
Rb
1.5 ohm
1% / 0603
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
V
IN
, V
MODE
, V
OUT
and EN/PWM ................. -0.3V to 6V
Output Current (I
OUT
) ...................................... 300mA
Power Dissipation per Package - 10-pin DFN
(derate 8.84mW/°C above +70°C) ..................... 1.2W
Junction Temperature .................................... +125°C
Storage Temperature ...................... -65°C to +150°C
ESD Rating. ................................................ 2kV HBM
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified: V
IN
= 3.6V, C1 = C4 = 2.2µF & C2 = C3 = 1µF (Ceramic, ESR=0.03Ω) and T
AMB
=25°.
The
♦
denotes specifications which apply over full operating temperature range -40ºC to +85ºC.
Parameter
Input Voltage
Quiescent Current
Shutdown Current
Maximum Load Current
Oscillator Frequency
V
FB
Reference Voltage
Min.
2.7
Typ.
Max.
5.5
Units
V
mA
µA
mA
♦
♦
♦
Conditions
0.5
0.5
200
0.7
0.283
1.2
0.315
8
3
1.5
V
IN
= 3.0 - 5.5V, V
OUT
= 3.6V,
Iout = 100µA
V
EN
/PWM = 0.0V, V
IN
= 5.5V
V
IN
= 4.2V, Vout = 3.6V
1.5
0.347
13
MHz
V
♦
♦
♦
V
IN
= 2.7 - 5.5V
I
OUT
= 20mA, V
OUT
= 3.6V,
1.5X Mode
1.5X Mode, 100mA Load
1.0X Mode, 100mA Load
V
IN
Falling
V
IN
= 3.6V
Output Resistance
3
V
MODE
Threshold Voltage
V
MODE
Hysteresis
V
MODE
Pin Current
EN/PWM Logic Low
EN/PWM Logic High
EN/PWM Pin Current
FB Pin Current
V
OUT
Ripple
1.6
0.01
0.01
80
0.5
0.5
1.00
1.25
60
0.01
6
1.50
150
0.5
0.4
Ω
♦
V
mV
µA
V
V
µA
µA
mV
♦
♦
♦
♦
♦
V
EN
/PWM = 4.2V
V
FB
= 1V
V
OUT
= 4V, I
OUT
= 100mA ,1.5x
Mode
♦
FB within 90% regulation
1.5X Mode, V
OUT
= 3.6, I
OUT
=
100µA
V
MODE
= 1.25 V
V
OUT
Turn-On Time
250
500
µs
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
2
PIN DESCRIPTION
PIN NUMBER
1
2
3
4
PIN NAME
V
OUT
C1P
V
IN
V
MODE
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.
5
6
FB
EN/PWM
7
8
9
10
C2N
GND
C1N
C2P
FUNCTIONAL DIAGRAM
V
IN
EN/PWM
Voltage
Reference
1.25V
1.2 MHz
Clock
Manager
C1P
Start-up
and
Charge
Pump
Switches
C1N
C2P
C2N
V
OUT
V
MODE
MODE
COMP
Mode Control
315mV
FB
V
OUT
COMP
GND
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS (25ºC)
200
Iout vs. Vin @ 60mA
200
Iout vs. Vin @ 100mA
150
Iout (mA)
100
Iout (mA)
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 4.2V
150
100
50
50
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 4.2V
3.0
3.5
4.0
4.5
5.0
0
3.0
3.5
4.0
4.5
5.0
0
Vin (V)
Vin (V)
300
250
Iout vs. Vin @ 200mA
400
350
300
Iout vs. Vin @ 300mA
200
Iout (mA)
Iout (mA)
250
200
150
100
150
100
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
50
0
3.0
3.5
4.0
4.5
5.0
50
0
3.0
3.5
4.0
4.5
5.0
Vin (V)
Vin (V)
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS (25ºC)
100
90
80
Efficiency vs Vin (Iout = 60mA)
100
90
80
Efficiency (%)
Efficiency vs Vin (Iout = 100mA)
Efficiency (%)
70
60
50
40
30
20
10
0
3.0
3.5
4.0
4.5
5.0
70
60
50
40
30
20
10
0
3.0
3.5
4.0
4.5
5.0
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 4.2V
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 4.2V
Vin (V)
Vin (V)
Efficiency vs Vin (Iout = 200mA)
100
90
80
Efficiency (%)
Efficiency (%)
Efficiency vs Vin (Iout = 300mA)
100
90
80
70
60
50
40
30
20
10
0
3.0
3.5
70
60
50
40
30
20
10
0
3.0
3.5
4.0
4.5
5.0
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
Vf = 3.9V
Vf = 3.0V
Vf = 3.3V
Vf = 3.6V
4.0
4.5
5.0
Vin (V)
Vin (V)
Date: 3/31/06 RevG
SP6683 1X/1.5X Charge Pump LED Driver for Flash or Backlight
© Copyright 2006 Sipex Corporation
5
stm32/stm8
