SP6699EK-L-TR Datasheet, PDF (1/13 Pages) Exar Corporation – 27V Step Up White LED Driver

October 2011
GENERAL DESCRIPTION
The SP6699 is an inductor-based DC/DC
converter designed to drive up to five white
LEDs in series for LCD modules and keypad
backlighting functions.
Only one feedback resistor is needed to
control the LED current and obtain the desired
brightness. A 1.0MHz constant frequency PWM
control scheme is used, enabling the usage of
small external components. A typical
application needs a 1mm tall inductor and a
0.22μF output capacitor. Additionally, the
boost circuit Schottky diode is integrated,
further reducing the overall foot print.
A logic controlled enable pin allows this device
to be placed in a low current consumption
mode of a few microamps. Furthermore, the
SP6699 is equipped with an over voltage
output protection circuit which clamps the
output voltage to 27 volts when any LED fails
or in other abnormal conditions.
The SP6699 is offered in a smal lead free,
RoHS compliant 6-pin SOT23 package.
SP6699
27V Step Up White LED Driver
Rev. 2.1.0
APPLICATIONS
 LCD Modules
 Keypad Backlighting
 Digital Cameras
 GPS Receivers
 Portable Media Players
FEATURES
 High Output Voltage: Up to 27V
 Drives 2 to 5 LEDs @ 20mA
 High Efficiency up to 84%
 Integrated Schottky Diode
 Fast 1.0MHz Switching Frequency
 200mV Feedback Voltage
 PWM Dimming Capability up to 1KHz
 Over Output Voltage Protection
 Internal Soft Start Circuit
 Small SOT23-6 Package Sub feature
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6699 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]