SP6682_06 Datasheet, PDF (1/12 Pages) Sipex Corporation – High Efficiency Charge Pump Regulator for White LEDs

SP6682
High Efficiency Charge Pump
Regulator for White LEDs
FEATURES
■ Ideal For White LED Driver
■ Low Profile, Inductorless Regulator
■ Output Current up to 200mA
■ X1.5 and X2 Modes for Highest Efficiency
■ +2.7V to +5.5V Input Voltage Range
■ Fast Turn-On Time, 175µS
■ 1mA Quiescent Current
■ <1.5µA Shutdown Current
■ 600kHz Oscillator
■ Programmable Output Current or Voltage
■ PWM Dimming Control with Enable Pin
■ Shutdown to Disconnect Output from Input
■ Soft Start to Eliminate In-Rush Current
■ Industry Standard 10-pin MSOP Package
and Small 10-pin DFN Package
VOUT ₁
C1P ₂
VIN ₃
VMODE ₄
FB ₅
10 C2P
SP6682
10 Pin DFN
9 C1N
8 GND
7 _C2N
6 _EN/PWM
Now Available in Lead Free Packaging
APPLICATIONS
■ Next Generation Mobile Phones
■ PDAs
■ 3.3V to 5.0V Conversion
■ Palmtop Computers
■ Color LCD Modules
DESCRIPTION
The SP6682 is a current regulated charge pump ideal for converting a Li-Ion battery input for
driving white LEDs used in backlighting color displays or cell phone camera flash applications.
The charge pump automatically switches between X1.5 and X2 modes based on the program-
mable V_MODE voltage, providing improved efficiency over traditional methods using charge pump
doubler followed by LDO. This input voltage threshold can be externally programmed by a resistor
divider network for optimized efficiency at specific output voltages and currents. The SP6682
operates with an internal 600kHz clock, which reduces switching noise and improves V_OUT ripple.
Output current or voltage can be accurately regulated by modulating the switcher between the
charge pump and output capacitor. In shutdown mode, the IC disconnects the output from the
input and draws less than 1.5µA current. The SP6682 is offered in a 10-pin MSOP package, and
a small 10-Pin DFN Package.
TYPICAL APPLICATION SCHEMATIC
LCD BACKLIGHT
APPLICATION _C2
2.2µF
2.7 - 4.2V
Lithium-Ion
C1
2.2µF
®
1 _VOUT
C2P ¹⁰
2 _{C1P SP6682 C1N} 9
3 _VIN
4 _VMODE
5 _FB
GND ⁸
C2N ⁷
6
EN/PWM
C6
0.1µF
C4
2.2µF _C5
2.2µF
White
LED
R6
20 20 20 20
R3
ENABLE/PWM DIMMING 1M
Date: 7/19/06 Rev D
SP6682 High Efficiency Charge Pump Regulator for White LEDs
1
© 2006 Sipex Corporation