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Diodes Semiconductor Electronic Components Datasheet

AP5726 Datasheet

Step-up DC/DC Converter

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AP5726 pdf
www.DataSheet4U.com
Features
Inherently Matched LED Current
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 and DFN2020C-6: Available in “Green”
Molding Compound (No Br, Sb)
Lead Free Finish/RoHS Compliant (Note 1)
AP5726
WHITE LED STEP-UP CONVERTER
General 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. 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.
Applications
Cellular Phones
PDAs, Hand help Computers
Digital Cameras
MP3 Players
GPS Receivers
Typical Application Circuit
VIN
ON OFF
PWM Dimming
L1
22uH
D1
C IN
1uF
VIN SW
AP5726 OVP
EN FB
GND
COUT
1uF
2~6 LEDs
RSET
15
Figure 1. Typical Application Circuit
AP5726 Rev. 1
1 of 16
www.diodes.com
JUNE 2009
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

AP5726 Datasheet

Step-up DC/DC Converter

No Preview Available !

AP5726 pdf
www.DataSheet4U.com
Ordering Information
AP5726
WHITE LED STEP-UP CONVERTER
AP 5726 XXX G - 7
Package
W : SOT26
FDC : DFN2020C-6
Green
G : Green
Packing
7 : Tape & Reel
Device
AP5726WG-7
AP5726FDCG-7
Package
Code
W
FDC
Packaging
(Note 2)
SOT26
DFN2020C-6
13” Tape and Reel
Quantity
Part Number Suffix
3000/Tape & Reel
-7
3000/Tape & Reel
-7
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
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
Pin Assignments
(1) SOT26
( Top View )
SW 1
6 VIN
GND 2
FB 3
5 OVP
74 EN
(2) DFN2020C-6
( Top View )
SW 1
VIN 2
OVP 3
6 GND
5 FB
4 EN
Pin Descriptions
Pin Name
SW
GND
FB
EN
OVP
VIN
Description
Switch Pin. Connect inductor/diode here. Minimize trace area at this pin to reduce EMI.
GND pin.
Feedback Pin. Reference voltage is 0.31V. Connect cathode of lowest LED and resister here.
Calculate resistor value according to the formula: RSET = 0.31V / ILED
Converter On/Off Control Input. A high input at EN turn on the converter, and a low input turns it
off. When not used, connect EN to the input source for automatic startup. The EN pin cannot be
left floating.
Output Voltage detect pin for over voltage protection.
Input Supply Pin. Must be locally bypassed with 1μF or 2.2μF to reduce input noise.
AP5726 Rev. 1
2 of 16
www.diodes.com
JUNE 2009
© Diodes Incorporated


Part Number AP5726
Description Step-up DC/DC Converter
Maker Diodes
Total Page 16 Pages
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