The ISL97671A is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2C or PWM signal for dimming control. The ISL97671A can drive six channels of LEDs from input 4.5V~26.5V to output of up to 45V. It can also operate from input as low as 3V to output of up to 26.5V in bootstrap configuration (see Figure 40).

The ISL97671A features optional channel phase shift control to minimize the input, output ripple characteristics and load transients as well as spreading the light output to help reduce the video and audio interference from the backlight driver operation.

The device can also be configured in Direct PWM Dimming with minimum dimming duty cycle of 0.007% at 200Hz.

Features

• 6 x 50mA Channels

• 4.5V to 26.5V Input with Max 45V Output

• 3V (see Figure 40) to 21V Input with Max 26.5V Output

• PWM Dimming with Phase Shift Control

• SMBus/I2C controlled PWM or DC Dimming

• Direct PWM Dimming

• PWM Dimming Linearity

   - PWM Dimming with Adjustable Dimming Freq and Duty Cycle Linear from 0.4% to 100% <30kHz

   - Direct PWM Dimming Duty Cycle Linear from 0.007% to 100% at 200Hz

• Current Matching ±0.7%

• 600kHz/1.2MHz selectable switching frequency

• Dynamic Headroom Control

• Fault Protection

   - String Open/Short Circuit, OVP, OTP, and Optional Output Short Circuit Fault Protection

• 20 Ld 4mmx3mm QFN Package

Applications

• Tablet PC to Notebook Displays LED Backlighting

• LCD Monitor LED Backlighting

• RGB LEDs or Field Sequential LED Backlighting