GENERAL DESCRIPTION

The OB3364 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 OB3364 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 OB3364 integrates 4 channels current balancer with up to 220mA 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 550mV so that benefits the efficiency and improve the IC thermal performance.

The OB3364 supports direct PWM dimming and analog dimming which allows flexible control of the backlight luminance. The LED current is directly modulated by PWM duty cycle on DIM pin.

OB3364 is offered in 16-pin ETSSOP.

FEATURES

10V gate drive, better MOS compatibility

High efficiency and compact size

6V to 40V input voltage range

3% matching accuracy between 4 LED strings control currents

100KHz~600KHz operating frequency

PWM and analog combination dimming

Very low standby power

Programmable over voltage protection

Under voltage lockout(UVLO)

LED string open/short protection

LED cathode node to ground short protection

Inductor/diode short protection

Over temperature protection (OTP)

APPLICATIONS

LCD Monitor

LCD TV

Flat panel display

TYPICAL APPLICATION