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SMBus/I 2 C 8-Channel LED Driver
ISL97677
The ISL97677 is an SMBus/I 2 C controlled multi-channel
LED driver for notebook and monitor LCD backlight
applications with PWM dimming and fault reporting
functions. The ISL97677 is capable of driving typically
96 pieces of 3.4V/50mA LEDs. The ISL97677 has
multiple channels of voltage controlled current sources
with typical currents matching to ±0.7%, which
compensate for the non-uniformity effect of forward
voltages variance in the LED strings. To minimize the
voltage headroom and power loss in the typical
multi-string operation, the ISL97677 features dynamic
headroom control that monitors the highest LED forward
voltage string and uses its feedback signal for output
regulation.
The ISL97677 can operate in multiple modes of
operations. It can be controlled by SMBus/I 2 C
communications and an external PWM dimming signal
with currents matching of ±1% across all ranges.
The ISL97677 features extensive protection functions
that include string open and short circuit detections, OVP,
and OTP. The fault conditions will be recorded in the
Fault/Status register. There are selectable short-circuit
thresholds and the switching frequency can be
programmed between 500kHz and 1.5MHz.
ISL97677 is available in the 32 Leads QFN 5mmx5mm
and operate from -40°C to +85°C with input voltage
ranges from 4.75V to 26V.
Features
? 8 Channels
? 4.75V ~ 26V Input
? 45V Maximum Output
? Drive Typically 96 LEDs (3.4V/50mA each)
? Dimming Controls
- SMBus/I 2 C 8-Bit PWM Dimming
- SMBus and External PWM DPST Dimming Control
- External PWM Dimming with or without SMBus/I 2 C
- PWM Dimming range from 0.4% to 100%
? Current Matching ±0.7%
? Protections
- String Open Circuit and Short Circuit Detections,
OVP, and OTP
? Adjustable Dimming Frequency
? Adjustable Switching Frequency
? 32 Ld (5mmx5mm) QFN Package
Applications
? Notebook Displays WLED or RGB LED Backlighting
? LCD Monitor LED Backlighting
November 13, 2009
FN6996.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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