Diodes AP3036B User Manual
Ap3036b, Description, Applications
AP3036B
Document number: DS37004 Rev.
1 - 2
1 of 11
March 2014
© Diodes Incorporated
AP3036B
A Product Line of
Diodes Incorporated
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WHITE LED STEP-UP CONVERTER
Description
The AP3036B is an inductor-based DC/DC converter designed to
drive up to eight white LEDs in series for backlight. Only one
feedback resistor is needed to control the LED current and obtain
required brightness.
A constant frequency 1.0MHz PWM control scheme is employed in
this IC, which means tiny external components can be used.
Specifically, 1mm tall inductor and 0.22µF output capacitor for a
typical application is sufficient. Additionally, the Schottky diode in
boost circuit is integrated on this chip. The AP3036B also provides a
disable pin to ease its use for different systems.
The output over-voltage protection is implemented in AP3036B. When
any LED is broken or in other abnormal conditions, the output voltage
will be clamped.
The AP3036B is available in standard SOT26 package.
Applications
Cellular Phones
Digital Cameras
LCD Modules
GPS Receivers
PDAs, Handheld Computers
Pin Assignments
(Top View)
SW
GND
FB
CTRL
VOUT
VIN
1
2
3
4
5
Pin 1 Mark
6
SOT26
Features
Inherently Uniform LED Current
High Efficiency up to 84%
No Need for External Schottky Diode
Output Over-voltage Protection (OVP)
Fixed 1.0MHz Switching Frequency
Uses Tiny 1mm Tall Inductor
Requires Only 0.22µF Output Capacitor
High Frequency Dimming Control
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. Seer more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-
free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
(Note 4)
22
1
F
0.22
F
10
VIN
SW
VOUT
FB
GND
CTRL
AP3036B
Control
Signal
L
C
IN
C
OUT
V
IN
3
V
Note 4: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can work in full temperature.