SP6682 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
■ 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
■ Built-in 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
■ Digital Still Cameras
■ Digital Camcorders
■ 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 LED used in backlighting color displays. The charge pump automatically switches
between X1.5 and X2 modes based on the input voltage, providing improved efficiency over
traditional methods using charge pump doubler followed by LDO. This input voltage threshold
can be externally programmed for optimized efficiency at specific output voltages and currents.
The SP6682 operates with an internal 600kHz clock, enabling the use of small external
components. 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
C2
2.2µF
2.7 - 4.2V
Lithium-Ion
R1
C1
2.2µF
R2
R3
ENABLE/PWM DIMMING 1M
®
1 _VOUT
C2P ¹⁰
2 _{C1P SP6682 C1N} 9
3 _VIN
4 _VMODE
5 _FB
GND ⁸
C2N ⁷
6
EN/PWM
C3
0.1µF
C6
0.1µF
C4
2.2µF _C5
2.2µF
White
LED
R6
20 20 20 20
Date: 5/5/04
SP6682 High Efficiency Charge Pump Regulator for White LEDs
1
© Copyright 2004 Sipex Corporation