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 an input of 4.5V~26.5V to an output of up to 45V. It

can also operate from an input as low as 3V to an output of up

to 26.5V in bootstrap configuration (see Figure 38).

The ISL97671A features optional channel phase shift control

to minimize the input: output ripple characteristics and load

transients to improve efficiency and eliminate audible noise.

The device can also be configured in Direct PWM Dimming

with minimum dimming duty cycle of 0.007 at 200Hz.

The ISL97671A headroom control circuit monitors the highest

LED forward voltage string for output regulation, to minimize

the voltage headroom and power loss in a typical multi-string

operation.

The ISL97671A is offered in compact and thermally efficient

20 Ld QFN 4mmx3mm package.

Features

• 6 x 50mA channels

• 4.5V to 26.5V input with max 45V output

• 3V (see Figure 38) 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 frequency 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

• Field sequential RGB LED backlighting