ISL97636A

6-Channel LED Driver

Product Status: Mass Production

OVERVIEW

The ISL97636A is an integrated power LED driver that controls 6 channels of LED current for LCD backlight applications. The ISL97636A is capable of driving typically 54 (6x9) pieces of 3.5V/30mA or 60 (6x10) pieces of 3.2V/20mA LEDs. The ISL97636A's contains 6 channels of voltage controlled current sources with typical currents matching of ±1%, which compensate for the non-uniformity effect of forward voltages variance in the LED stacks. To minimize the voltage headroom and power loss in the typical multi-strings operation, the ISL97636A features a dynamic headroom control that monitors the highest LED forward voltage string and uses its feedback signal for output regulation.

The LED brightness can be pulse width modulated with an applied PWM signal from DC to audio noise free 20kHz.

The ISL97636A features extensive protection functions that include string open and short circuit detections, OVP, OTP, thermal shutdown and an optional input overcurrent protection with master fault disconnect switch.

Available in the 24 Ld 4mmx4mm QFN, the ISL97636A operates from -40°C to +85°C with input voltage ranges from 6V to 24V for high LEDs count applications.

KEY FEATURES

  • 6 channels
  • 6V to 24V Input
  • 34.5V Output Max
  • Drive Maximally 54 (3.5V/30mA each) or 60 (3.2V/20mA each) LEDs
  • Current Matching ±1% Typ
  • Dynamic Headroom Control
  • PWM Signal up to 20kHz Dimming
  • Protections
  • String Open Circuit Detection
  • String Short Circuit Detection with Selectable Thresholds
  • Over-Temperature Protection
  • Overvoltage Protection
  • Optional Input Overcurrent Protection w/Disconnect SW
  • 1.2MHz Switching Frequency
  • 24 Ld 4mmx4mm QFN Package
  • Pb-Free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97636A
Basic Information
Production Status
Mass Production
# of Devices/ Channels
6
Total Current for DC/DC Lighting (mA)
210
Output Current Max/Channel (mA)
35
Output Voltage Max (V)
34.5
Brightness Control
PWM
Input Voltage Max (V)
24
Input Voltage Min (V)
6
Backlight for LCD Size (min) (in)
0
Backlight for LCD Size (max) (in)
17
Qualification Level
Standard
Peak Efficiency (%)
91
# of LEDs (max)
60
Frequency
1.2 MHz
IS (max)
10 mA
IQ (max)
20 µA
ISW (typ) (mA)
2500
Integrated Diode
No
Over Voltage Protection
Yes
Fault Switch
Yes
Topologies
Inductor Boost
Input Voltage Range (V)
6 to 24
Backlight for LCD Size
up to 17
Can Sample
YES
Temperature Range
-40 to +85

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