Compact 2-3-4-Ch LED Drivers with Phase Shift Control

The ISL97682, ISL97683, ISL97684 are Intersil’s highly integrated 2-3-4-channels LED drivers that are suitable for medium size TFT-LCD backlights. These parts can drive multiple channels of LEDs from inputs as low as 4V to outputs of up to 45V. They can also operate from inputs as low as 3V to outputs of up to 26.5V in bootstrap configuration (see Figure 26 for 3V operation).

Features

• ISL97682 - 2 x 100mA Channels

• ISL97683 - 3 x 50mA Channels

• ISL97684 - 4 x 50mA Channels

• Input Voltage 4.0V~26.5V with Max VOUTof 45V

• Input Voltage 3.0V (see Figure 26)~24V with Max VOUT of 26.5V

• PWM Dimming Linearity

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

- Direct PWM Dimming with DutyCycle Linear from 0.009% to 100% at 200Hz

• Current Matching of 0.7% typical from 1%~100% Dimming

• Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM Mode

• Dynamic Headroom Control

•Fault Protection

-String Open/Short Circuit Protections, OVP, OTP

• Thin and Compact TQFN-16 3mmx3mm Package

Applications

• Tablet to Notebook PC Displays LED Backlighting

• PMP LED Backlighting