ISL97673

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

OVERVIEW

The ISL97673 is a 6-Channel 45V dual dimming capable LED driver that can be used with either SMBus/I2 C or PWM signal for dimming control. The ISL97673 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 ISL97673 VIN pin.

The ISL97673 compensates for non-uniformity of the forward voltage drops in the LED strings with its six 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 ISL97673 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 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 ISL97673 has a full range of dimming capabilities that include SMBus/I2 C controlled PWM dimming or DC dimming. Another key feature of the ISL97673 is that it allows very linear PWM dimming from 0.4% to 100% of up to 30kHz. Current matching of 0.4% to 100% dimming achieves ±1% tolerance from 100Hz to 5kHz dimming and ±3% tolerance from 5kHz to 30kHz dimming.

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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97673
Basic Information
Production Status
Mass Production
# of Devices/ Channels
6
Total Current for DC/DC Lighting (mA)
240
Output Current Max/Channel (mA)
40
Output Voltage Max (V)
45
Brightness Control
SMBus, PWM or DC
Bus/Output Interface
SMBus/I2C
Input Voltage Max (V)
26.5
Input Voltage Min (V)
4.5
Backlight for LCD Size (min) (in)
0
Backlight for LCD Size (max) (in)
17
Qualification Level
Standard
Peak Efficiency (%)
92.9
# of LEDs (max)
78
Frequency
0.6/1.2 MHz
IS (max)
5 mA
IQ (max)
5 µA
ISW (typ) (mA)
2000
Integrated Diode
No
Over Voltage Protection
Yes
Fault Switch
Yes
Topologies
Inductor Boost
Input Voltage Range (V)
4.5 to 26.5
Backlight for LCD Size
up to 17
Temperature Range
-40 to +85

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