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PDF SP6682 Data sheet ( Hoja de datos )
| Número de pieza | SP6682 | |
| Descripción | High Efficiency White LED Charge Pump Regulator | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP6682 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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February 2009
SP6682
High Efficiency White LED Charge Pump Regulator
Rev. 2.0.0
GENERAL 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 VMODE 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 VOUT 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.
APPLICATIONS
• Mobile Phones & PDAs
• 3.3V to 5V Conversion
• Palmtop Computers
• Color LCD Modules
FEATURES
• 200mA Output Current
• Low Profile Inductorless Regulator
− 600KHz Oscillator
− x1.5 and x2 Conversion Modes
• 2.7V to 5.5V Input Voltage Range
• Fast Turn-on Time 175µs
• 1mA Quiescent Current
• Adjustable Output Current and Voltage
• PWM Dimming Control
• True Shutdown Disconnect
• Soft Start
• 10-pin MSOP and 10-pin DFN Packages
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6682 LCD Backlighting Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
SP6682
High Efficiency White LED Charge Pump Regulator
Fig. 9: Brightness vs. Input Voltage
Fig. 10: Brightness vs. Duty Cycle
Fig. 11: IOUT vs. VIN
© 2009 Exar Corporation
5/13
Rev. 2.0.0
5 Page 
SP6682
High Efficiency White LED Charge Pump Regulator
PACKAGE SPECIFICATION
10-PIN MSOP
© 2009 Exar Corporation
11/13
Rev. 2.0.0
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SP6682.PDF ] | |
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