The OB3363(A) is a highly integrated and high performance LED driver that optimized for LCD backlight application. It integrates a boost driver and 4 channels of current balancer that optimized to drives multi LED arrays, and thus provides a high performance LED backlight solution with minimized BOM count.
The OB3363(A) contains a PWM boost driver which uses current mode control and fixed frequency operation. The operation frequency can be programmed by setting external resistor value at RI pin.
The OB3363(A) integrates 4 channels current balancer with up to 170mA current capability per channel and it achieves 3% matching accuracy among LED strings. The minimum voltage of current source is regulated to as lower as 350mV so that benefits the efficiency and improve the IC thermal performance.
The OB3363(A) supports external PWM dimming mode which allow flexible control of the backlight luminance. The LED current is directly modulated by external PWM duty cycle.
OB3363 is offered in 16-pin TSSOP
OB3363A is offered in 16-pin SOP
n 10V gate drive, better MOS compatibility
n High efficiency and compact size
n 6V to 40V input voltage range
n 3% matching accuracy between 4 LED strings control currents
n 100KHz~300KHz operating frequency
n External PWM dimming control
n Very low standby power
n Programmable Over Voltage Protection
n Under Voltage Lockout(UVLO)
n LED string open/short protection
n LED cathode node to ground short protection
n Inductor/Diode short protection
n Over Temperature Protection (OTP)
n LCD Monitor
n LCD TV
n Flat panel display