ISL97672B
6-Channel LED Driver with Ultra Low Dimming Capability
Key Features
- 6 x 50mA Channels
- 4.5V to 26.5V Input
- 45V Output Max
- Adaptive Boost Switching Architecture
- Direct PWM Dimming with Dimming Linearity of0.007%~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
- OVP
- OTP
- Optional Output Short-Circuit Fault Protection Switch
- Current Matching ±0.7%
- 20 Ld 3x4 QFN Package
Description
The ISL97672B is an integrated power LED driver that controls six channels of LED current for LCD backlight applications. The ISL97672B is capable of driving LEDs from 4.5V to 26.5V, with a maximum output of 45V.
The ISL97672B employs an adaptive boost switching architecture that allows Direct PWM dimming with linearity as low as 0.007% at 200Hz or 0.8% at 20kHz. Dimming can be as high as 30kHz.
The ISL97672B can compensate for non-uniformity of forward voltage drops in the LED strings. Its headroom control circuit monitors the highest LED forward voltage string for output regulation to minimize voltage headroom and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%.
The ISL97672B features extensive protection functions that flag whenever a fault occurs. The protections include string-open and short-circuit detections, OVP, OTP, and an optional output short-circuit protection with a fault disconnect switch.
The ISL97672B is offered in a compact 20 Ld QFN 3x4 package and can operate in ambient temperatures of -40°C to +85°C.
Applications
- Notebook Displays LED Backlighting
- LCD Monitor LED Backlighting
- Multi-Function Printer Scanning Light Source
