Diodes Incorporated

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White LED Step-Up Converter for Small Panel with Schottky Integrated

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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.


  • Cellular Phones
  • Digital Cameras
  • LCD Modules
  • GPS Receivers
  • PDAs, Handheld Computers

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Function Boost LED Driver
MinimumInput Voltage (V) 2.5 V
MaximumInput Voltage (V) 16 V
Maximum Output Voltage (V) 30 V
Number of Regulated Output Channels 1
Maximum Output Current per Channel 40 mA
Typical Over-Current Protection Current 550 mA
Switching Frequency (kHz) 1 MHz
Efficiency (%) 84 %
Quiescent Current (µA) 3.1 mA
Standby Quiescent Current (µA) 45 µA
Dimming High Frequency PWM and External DC
Soft Start Yes
VFB 200 V
OperatingTemperatureRange  (°C) -40 to 85 °C

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2603 2023-03-20 2023-06-20 Qualified Additional Wafer Fab Source (SFAB2/JKFAB), Die Revision, Bill of Material
PCN-2366 2018-09-19 2018-12-19 Qualification of Additional Bill of Materials (BOM), Fab Source, A/T Site and Top Marking Change on Select Product