6-Channel LED Driver with Ultra Low Dimming Capability

The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4.5V to 26.5V and a maximum output up to 45V.

The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0.007 at 200Hz or 0.8 at 20kHz. PWM Dimming frequency can be as high as 30kHz.

Features

• 6 x 50mA channels

• 4.5V to 26.5V input

• 45V output maximum

• Adaptive boost switching architecture

• Direct PWM dimming with dimming linearity of 0.007~100 at 200Hz or 0.8~100 <20kHz

• Adjustable 200kHz to 1.4MHz switching frequency

• Dynamic headroom control

• Fault protections with latched flag indication

- String open/short-circuit

- Overvoltage Protection (OVP)

- Over-Temperature Protection (OTP)

- Optional output short-circuit fault protection switch

• Current matching ±0.7

• 20 Ld 3x4 QFN package

Applications

• Notebook displays LED backlighting

• LCD monitor LED backlighting

• Multi-function printer scanning light source