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PDF SP6686 Data sheet ( Hoja de datos )
| Número de pieza | SP6686 | |
| Descripción | 400mA Buck/Boost Charge Pump LED Driver | |
| Fabricantes | Exar | |
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August 2009
SP6686
400mA Buck/Boost Charge Pump LED Driver
Rev. 2.0.0
GENERAL DESCRIPTION
The SP6686 is a current-regulated charge
pump ideal for powering high brightness LEDs
for camera flash applications.
The charge pump can be set to regulate two
current levels for FLASH and TORCH modes.
The SP6686 automatically switches modes
between step-up and step-down ensuring that
LED current does not depend on the forward
voltage. A low current sense reference voltage
(50mV) allows the use of small 0603 current
sensing resistors.
The SP6686 is designed to operate from a
single cell lithium-ion battery or fixed 3.3V or
5.0V power rails and is available in a RoHS
compliant, “green”/halogen free space saving
10-pin 3mmx3mm DFN package
TYPICAL APPLICATION DIAGRAM
APPLICATIONS
• White LED Torch/Flash for Mobile
Phones, DSCs and Camcorders
• Generic Lighting/Flash/Strobe
Applications
• White LED Backlighting
FEATURES
• Output Current up to 400mA
• Up to 94% Efficiency in Torch Mode
• Adjustable FLASH Mode
• x1 and x2 Automatic Modes for High
Efficiency
• Minimum External Components: No
Inductors
• 2.4MHz High Frequency Operation
• 1μA Shutdown Current
• Built-In Soft Start Limit Inrush Current
• Output Overvoltage Protection
• Over current/Temperature Protection
• 10-pin 3mm x 3mm DFN Package
Fig. 1: SP6686 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  
SP6686
400mA Buck/Boost Charge Pump LED Driver
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 3.6V, TA = 25°C, unless otherwise specified - Schematic and BOM from Application Information
section of this datasheet. D1 = AOT 2015HPW-1915B LED.
Fig. 4: Output Current vs Supply Voltage
CIN=2.2µF, CFC=0.47µF,COUT=1µF
Fig. 5: Output Current vs Supply Voltage
CIN=2.2µF, CFC=0.47µF,COUT=1µF
Fig. 6: Efficiency vs Supply Voltage
CIN=2.2µF, CFC=0.47µF,COUT=1µF
Fig. 7: Efficiency vs Supply Voltage
CIN=2.2µF, CFC=0.47µF,COUT=1µF
Fig. 8: Ripple 1x Flash 400mA, Ch1=VIN, Ch2=VOUT
VIN=4.2V, CIN=4.7µF, CFC=0.47µF,COUT=2.2µF
Fig. 9: Ripple 2x Flash 400mA, Ch1=VIN, Ch2=VOUT
VIN=3.6V, CIN=4.7µF, CFC=0.47µF,COUT=2.2µF
© 2009 Exar Corporation
5/12
Rev. 2.0.0
5 Page 
PACKAGE SPECIFICATION
10-PIN DFN
SP6686
400mA Buck/Boost Charge Pump LED Driver
© 2009 Exar Corporation
11/12
Rev. 2.0.0
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SP6686.PDF ] | |
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