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PDF SP6699 Data sheet ( Hoja de datos )
| Número de pieza | SP6699 | |
| Descripción | 30V Step Up White LED Driver | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP6699 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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April 2014
GENERAL DESCRIPTION
The SP6699 is an inductor-based DC/DC
converter designed to drive up to six 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 1.2MHz 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 30 volts when any LED fails or in
other abnormal conditions.
The SP6699 is offered in a small lead free, RoHS
compliant 6-pin SOT23 package.
SP6699
30V Step Up White LED Driver
APPLICATIONS
LCD Modules
Keypad Backlighting
Digital Cameras
GPS Receivers
Portable Media Players
Rev. 3.0.0
FEATURES
High Output Voltage: Up to 30V
Drives 2 to 6 LEDs @ 20mA
High Efficiency up to 84%
Integrated Schottky Diode
Fast 1.2MHz Switching Frequency
200mV Feedback Voltage
PWM Dimming Capability up to 2KHz
Over Output Voltage Protection
Internal Soft Start Circuit
Small SOT23-6 Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP6699 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  
SP6699
30V Step Up White LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 3.6V, EN= VIN, RSET=24kΩ, TA = 25°C, unless otherwise specified - Schematic and BOM from Application
Information section of this datasheet.
Fig. 4: Efficiency vs. Junction Temperature
Fig. 5: Efficiency vs. Input Voltage
Fig. 6: Efficiency vs. Number of LEDs
Fig. 7: Schottky Forward Current
vs Schottky Forward Drop
Fig. 8: Shutdown Quiescent Current
vs Input Voltage
© 2014 Exar Corporation
5/13
Fig. 9: Supply Current vs Input Voltage
Rev. 3.0.0
5 Page 
TYPICAL APPLICATION CIRCUITS
4 White LEDs Driver
SP6699
30V Step Up White LED Driver
C: X5R or X7R Dielectric
L: Sumida CDRH5D28R-100NC or equivalent
For use over the full operating temperature range
5 (or 6) White LEDs Driver
C: X5R or X7R Dielectric
L: Sumida CDRH5D28R-220NC or equivalent
For use over the full operating temperature range
© 2014 Exar Corporation
11/13
Rev. 3.0.0
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet SP6699.PDF ] | |
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