AP3019AKTTR-G1 Diodes Incorporated

AP3019A WHITE LED STEP-UP CONVERTER Description Pin Assignments The AP3019A 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 1.2MHz PWM control scheme is employed in 6 SW 1 V this IC, which means tiny external components can be used. IN Specifically, 1mm tall inductor and 0.22 F output capacitor for a typical application is sufficient. Additionally, the Schottky diode in 2 5 V GND OUT boost circuit is integrated on this chip. The AP3019A also provides a disable pin to ease its use for different systems. CTRL FB 3 4 The output over-voltage protection is implemented in AP3019A. When any LED is broken or in other abnormal conditions, the output voltage K/KT Package will be clamped. (SOT-23-6/TSOT-23-6) The AP3019A is available in standard SOT-23-6 and TSOT-23-6 packages. Applications Cellular Phones Features Digital Cameras Inherently Uniform LED Current LCD Modules High Efficiency up to 84% GPS Receivers No Need for External Schottky Diode PDAs, Handheld Computers Output Over-voltage Protection (OVP) Fixed 1.2MHz Switching Frequency Uses Tiny 1mm Tall Inductor Requires only 0.22F Output Capacitor 1 of 12 AP3019A August 2018 Diodes Incorporated www.diodes.com Document number: DS41298 Rev. 3 - 2 NEW PRODUCT AP3019A Typical Applications Circuit V 3V L 22 H IN 1 5 6 SW V OUT V IN C Control OUT AP3019A Signal 0.22 F 4 3 CTRL FB GND C IN 10 2 1 F C: X5R or X7R dielectric L: SUMIDA CDRH5D28R-220NC or equivalent This circuit can work in full temperature Pin Descriptions Pin Number Pin Name Function 1 SW Switch pin. Connect external inductor 2 GND Ground 3 FB Voltage feedback pin. Reference voltage is 200mV Shutdown and dimming pin. Connect to 1.8V or higher to enable device Connect to 0.5V or less to 4 CTRL disable device Connect to a PWM signal to achieve LEDs brightness dimming 5 V OUT Output pin. Connect to the cathode of internal Schottky diode 6 VIN Input supply pin. Must be connected to a local bypass capacitor 2 of 12 AP3019A August 2018 Diodes Incorporated www.diodes.com Document number: DS41298 Rev. 3 - 2 NEW PRODUCT