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AP5726
WHITE LED STEP-UP CONVERTER
AP5726
Document number: DS31845 Rev. 3 - 2
1 of 17
www.diodes.com
July 2010
© Diodes Incorporated
Description
The AP5726 is a step-up DC/DC converter specifically
designed to drive white LEDs with a constant current. The
device can drive 2 ~ 6 LEDs in series from a Li-Ion cell.
Series connection of the LEDs provides identical LED
currents resulting in uniform brightness and eliminates the
need for ballast resistors. For driving higher number of LEDs,
AP5726 also supports a single feedback of parallel
connected multiple strings of equal number of LEDs.
The AP5726 switches at 1.2MHz that allows the use of tiny
external components. A low 0.31V feedback voltage
minimizes power loss in the current setting resistor for better
efficiency.
Pin Assignments
1
2
3
7
4
6
OVP
FB
5
EN
SW
(Top View)
VIN
GND
SOT26 / TSOT23-6
SW
V
IN
OVP
1
2
3
6
5
4
GND
FB
EN
(Top View)
DFN2020C-6
Features
High efficiency: 84% typical
Fast 1.2MHz switching frequency
Current limit and UVLO protections
Internal Thermal Shutdown
Internal Over Voltage Protection
Integrated soft-start function
SOT26, TSOT23-6 and DFN2020C-6: Available in
“Green” Molding Compound (No Br, Sb)
Lead Free Finish/ RoHS Compliant (Note 1)
Applications
• Cellular Phones
PDAs, Hand help Computers
• Digital Cameras
• MP3 Players
• GPS Receivers
Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
Typical Application Circuit
V
IN
SW
EN
GND
FB
AP5726
C
OUT
1uF
R
SET
15
L1
22uH
D1
V
IN
C
IN
1uF
OVP
2~6 LEDs
PWM Dimming
OFFON
Figure 1. Typical Application Circuit
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Résumé du contenu

Page 1 - 2~6 LEDs

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description T

Page 2 - Functional Block Diagram

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 10 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 3

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 11 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 4 - Electrical Characteristics (V

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 12 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications

Page 5 - Feedback Voltage(V)

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 13 of 17 www.diodes.com July 2010 © Diodes Incorporated Ordering Info

Page 6 - = 3.6V

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 14 of 17 www.diodes.com July 2010 © Diodes Incorporated Package Outli

Page 7 - 4 LEDs ; L = 22uH

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 15 of 17 www.diodes.com July 2010 © Diodes Incorporated Package Outli

Page 8

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 16 of 17 www.diodes.com July 2010 © Diodes Incorporated Taping Orient

Page 9 - 9 of 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 17 of 17 www.diodes.com July 2010 © Diodes Incorporated IMPORTANT NOT

Page 10 - July 2010

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 2 of 17 www.diodes.com July 2010 © Diodes Incorporated Pin Descriptio

Page 11 - WHITE LED STEP-UP CONVERTER

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 3 of 17 www.diodes.com July 2010 © Diodes Incorporated Absolute Maxim

Page 12 - 12 of 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 4 of 17 www.diodes.com July 2010 © Diodes Incorporated Electrical Cha

Page 13 - ( Top View )

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 5 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Page 14

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 6 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Page 15 - (Continued)

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 7 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Page 16 - © Diodes Incorporated

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 8 of 17 www.diodes.com July 2010 © Diodes Incorporated Typical Perfor

Page 17

AP5726WHITE LED STEP-UP CONVERTER AP5726 Document number: DS31845 Rev. 3 - 2 9 of 17 www.diodes.com July 2010 © Diodes Incorporated Applications I

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