ISL97671A

6-Channel SMBus/I2 C or PWM Dimming LED Driver with Phase Shift Control

Product Status: Mass Production

OVERVIEW

The ISL97671A 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 ISL97671A can drive six channels of LEDs from an input of 4.5V~26.5V to an output of up to 45V. It can also operate from an input as low as 3V to an output of up to 26.5V in bootstrap configuration.

The ISL97671A features optional channel phase shift control to minimize the input/output ripple characteristics, and load transients to improve efficiency and eliminate audible noise.

The device can also be configured for Direct PWM Dimming with a minimum dimming duty cycle of 0.007% at 200Hz.

The ISL97671A headroom control circuit 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 ISL97671A is offered in a compact and thermally efficient 20 Ld QFN 4mmx3mm package.

KEY FEATURES

  • 6 x 50mA channels
  • 4.5V to 26.5V input with 45V maximum output
  • 3V to 21V input with 26.5V maximum output
  • PWM dimming with phase shift control
  • SMBus/I2C controlled PWM or DC dimming
  • Direct PWM dimming
  • PWM dimming linearity
  • PWM dimming with adjustable dimming frequency and duty cycle linear from 0.4% to 100% <30kHz
  • Direct PWM dimming duty cycle linear from 0.007% to 100% at 200Hz
  • Current matching ±0.7%
  • 600kHz/1.2MHz selectable switching frequency
  • Dynamic headroom control
  • Fault protection
  • String open/short-circuit, OVP, OTP, and optional output short-circuit fault protection
  • 20 Ld 4mmx3mm QFN package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97671A
Basic Information
Production Status
Mass Production
# of Devices/ Channels
6
Total Current for DC/DC Lighting (mA)
300
Output Current Max/Channel (mA)
50
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
Can Sample
YES
Temperature Range
-40 to +85

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