OB3353CP is an efficient dual-channel synchronous rectifier step-down DC-DC converter chip. The pin functions of the chip are as follows: VIN is the input voltage pin, VCC is the chip supply voltage pin, SW1 and SW2 are the output switch pin, FB1 and FB2 are the feedback pin, EN1 and EN2 are the enable pin, PG1 and PG2 are the power good pin, and GND is the ground pin. Among them, SW1 and SW2 control the output voltage through the switch, the feedback pin controls the output voltage stability through the feedback, the enable pin controls the output power switch through the enable, the power good pin provides feedback signals by detecting the power status, and GND is the chip grounding pin.
1 pin VIN power input, 2 pin GATE output drive, 3 pin GND grounding, 4 pin CS output current monitoring, 5 pin FB backlight bar current setting, 6 pin COMP loop compensation, 7 pin OVP overvoltage protection, 8 pin PWM external dimming control.