ISL97672B

6-Channel LED Driver with Ultra Low Dimming Capability

OVERVIEW

The ISL97672B is an integrated 6-channel power LED driver for LCD backlight applications. The ISL97672B is capable of driving LEDs with an input from 4.5V to 26.5V and a maximum output up to 45V.

The ISL97672B employs an adaptive boost switching architecture that allows direct PWM dimming with dimming duty cycle as low as 0.007% at 200Hz or 0.8% at 20kHz. PWM Dimming frequency can be as high as 30kHz.

The ISL97672B employs dynamic headroom control that monitors the highest LED forward voltage string for output regulation to minimize headroom voltage and power loss in a typical multi-string operation. Typical current matching between channels is ±0.7%.

The ISL97672B incorporates 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 external 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.

KEY FEATURES

  • 6 x 50mA channels
  • 4.5V to 26.5V input
  • 45V output maximum
  • Adaptive boost switching architecture
  • Direct PWM dimming with dimming linearity of 0.007%~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
  • Overvoltage Protection (OVP)
  • Over-Temperature Protection (OTP)
  • Optional output short-circuit fault protection switch
  • Current matching ±0.7%
  • 20 Ld 3x4 QFN package

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97672B
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
PWM
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

Confirm below disclaimers

Input Renesas account name and password