AP3036BKTR-G1 Diodes Incorporated

A Product Line of Diodes Incorporated AP3036B WHITE LED STEP-UP CONVERTER Description Pin Assignments The AP3036B is an inductor-based DC/DC converter designed to (Top View) drive up to eight white LEDs in series for backlight. Only one feedback resistor is needed to control the LED current and obtain Pin 1 Mark required brightness. A constant frequency 1.0MHz PWM control scheme is employed in this IC, which means tiny external components can be used. CTRL 1 6 FB Specifically, 1mm tall inductor and 0.22F 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 VOUT 2 5 GND disable pin to ease its use for different systems. The output over-voltage protection is implemented in AP3036B. When VIN 3 4 SW any LED is broken or in other abnormal conditions, the output voltage will be clamped. SOT26 The AP3036B is available in standard SOT26 package. Features Applications Inherently Uniform LED Current Cellular Phones High Efficiency up to 84% Digital Cameras No Need for External Schottky Diode LCD Modules Output Over-voltage Protection (OVP) GPS Receivers Fixed 1.0MHz Switching Frequency PDAs, Handheld Computers Uses Tiny 1mm Tall Inductor Requires Only 0.22F 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. See A Product Line of Diodes Incorporated AP3036B Pin Descriptions Pin Number Pin Name Function Shutdown and dimming pin. Connect to 1.5V or higher to enable device Connect to 0.4V or less to 1 CTRL disable device Connect to a PWM signal to achieve LEDs brightness dimming 2 VOUT Output pin. Connect to the cathode of internal Schottky diode 3 VIN Input supply pin. Must be connected to a local bypass capacitor 4 SW Switch pin. Connect external inductor 5 GND Ground 6 FB Voltage feedback pin. The reference voltage is 200mV Functional Block Diagram FB SW 6 4 2 SOFT VOUT START 200 mV OVP DRIVER 3 A1 V VIN REF R Q Q1 A2 1.25 V S COMPARATOR 5 GND 1 CTRL RAMP GENERATOR 1.0MHz OSCILLATOR 2 of 11 AP3036B March 2014 Diodes Incorporated www.diodes.com Document number: DS37004 Rev. 1 - 2 NEW PRODUCT