Data Sheet WHITE LED STEP-UP CONVERTER AP3031 General Description Features The AP3031 is an inductor-based DC/DC boost con- Up to 92% Efficiency verter designed to drive LED arrays. 1.4A switching (V =9V, I =260mA) IN OUT current allows AP3031 to be used in different 7 to 10 Up to 84% Efficiency LCD panel backlights (3*13 LED arrays typically). (V =5V, I =260mA) IN OUT Fast 1MHz Switching Frequency A constant frequency 1MHz PWM control scheme is employed in this IC, which means tiny external com- Wide Input Voltage Range: 2.7V to 16V ponents can be used. Specifically, 1mm tall 4.7H Low 200mV Feedback Voltage inductor and 0.47F output capacitor for the typical Output Over Voltage Protection application is sufficient. Cycle by Cycle Current Limit: 1.4A Built-in Soft-start The over output voltage protection is equipped in Built-in Standby Mode to Achieve High Fre- AP3031, which protects the IC under open load condi- quency PWM Dimming tion. The AP3031 includes UVLO, soft-start, current Built-in Thermal Shutdown Function limit and OTSD to protect the circuit. Under Voltage Lockout The AP3031 is available in standard SOT-23-6, TSOT- 23-6 and SOIC-8 packages. Applications 7 to 10 LCD Panels Digital Photo Frame GPS Receiver EPC PDVD SOT-23-6 TSOT-23-6 SOIC-8 Figure 1. Package Types of AP3031 Dec. 2012 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 1 Data Sheet WHITE LED STEP-UP CONVERTER AP3031 Pin Configuration K/KT Package M Package (SOIC-8) (SOT-23-6/TSOT-23-6) Pin 1 Mark CTRL 8 FB 1 V SW 1 6 IN OV 2 7 GND OV GND 2 5 GND GND 3 6 4 5 V FB34 CTRL SW IN Figure 2. Pin Configuration of AP3031 (Top View) Pin Description Pin Number Pin Name Function 6-Pin 8-Pin 1 4 SW Switch Pin. Connect external inductor and Schottky 2 2, 3, 6 GND Ground Pin 3 1 FB Voltage Feedback Pin. Reference voltage is 200mV Enable and Dimming Control Pin. Connect to a high input to enable the IC or a low input to disable the IC. 4 8CTRL If logic low time is more than about 0.7ms and then enable the IC, the AP3031 will soft start to protect system departments. If logic low time is less than about 0.7ms and then enable the IC, the AP3031 will hold on standby mode and start directly to achieve high frequency dimming 5 7 OV Over-voltage Protection Input Pin. Connect to the output directly. On OVP condition, the out- put voltage will be clamped 65 V Input Supply Pin. Must be locally bypassed IN Dec. 2012 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 2