6-Channel SMBus/I2C or PWM Dimming LED Driver with Phase Shift Control
Topologies
Inductor Boost
# of LEDs (max)
78
# of Channels
6
Digital Interface
SMBus/I2C
Backlight For LCD Size
up to 17
Total Current for DC/DC Lighting (mA)
240
IOUT (max/Channel) (mA)
40
Peak Efficiency (%)
92.9
VIN (V)
4.5 to 26.5
VOUT (max) (V)
45
Frequency (MHz)
0.6/1.2
IS (max) (mA)
5
Iq (max) (μA)
5
Isw (typ) (mA)
2000
Integrated Diode
N
OVP
Y
Fault Switch
Y
Brightness Control
SMBus, PWM or DC
Product Information
Key Features
6 Channels
4.5V to 26.5V Input
45V Output Max
Up to 40mA LED Current per channel
Extensive Dimming Control
PWM/DPST Dimming, I2C 8-bit with equal phase shift, and 0.007% Direct PWM dimming at 200Hz
Optional Master Fault Protection
PWM Dimming Linearity 0.4%~100% <30kHz
600kHz/1.2MHz selectable switching frequency
Dynamic Headroom Control
Protections with Flag Indication
String Open/Short Circuit, VOUT Short Circuit, Overvoltage and Over-Temperature Protections
Optional Master Fault Protection
Current Matching ±0.7%
20 Ld 4mmx3mm QFN Package
Description
The ISL97671 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 ISL97671 drives 6 channels of LED to support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost supply of 2.7V to 26V and a separate 5V bias on the ISL97671 VIN pin.
The ISL97671 compensates for non-uniformity of the forward voltage drops in the LED strings with its 6 voltage controlled-current source channels. Its headroom control 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 ISL97671 features optional channel phase shift control to minimize the input, output ripple characteristics and load transients as well as spreading the light output to help reduce the video and audio interference from the backlight driver operation. The phase shift can be programmed with equal phase angle or adjustable in 7-bit resolution.
The ISL97671 has a full range of dimming capabilities that include SMBus/I2C controlled PWM dimming or DC dimming. It can also do direct PWM dimming with as low as 350nS pulse on PWM pin which translates to a dutycycle of 0.007% at a 200Hz dimming frequency.
The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.
MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020
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