6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control

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 (refer to Figure 38 on page 26).

Features

• 6 x 50mA channels

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

• 3V (see Figure 38 on page 26) to 21V input with 26.5V maximum 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