ISL78100

High Power LED Driver

OVERVIEW

The ISL78100 is a high-power LED backlight driver with an integrated 36V FET designed to drive up to 8 high-power LEDs in series. The PWM converter runs from an internally generated 1MHz clock. With efficiencies over 90%, the regulator provides tight control of LED current and may be configured in either boost or buck topologies, allowing from 3 to 8 series diodes to be driven from wide input voltages.

LED light level may be controlled either by:
  1. LED DC bias current set via the LEVEL pin, or
  2. External low frequency PWM control via the ENABLE/PWM pin.
In both control modes, optional over-temperature thermal protection of the LED reduces the LED DC bias current above an adjustable set temperature, protecting the LED from thermal damage. An optional fault monitor drives an external FET between the input supply and inductor, providing short circuit current protection for the LED and inductor as well as load dump protection for automotive applications. For low cost applications the pass transistor may be omitted and the fault pin bypassed.

The ISL78100 is packaged in a 20 Ld 4mmx4mm QFN package and is specified for operation over the -40°C to +105°C temperature range.

KEY FEATURES

  • Drives 3 to 8 high-power LEDs in series, up to 32V
  • 2.7V to 16V input voltage range
  • Boost or Buck configurable switch
  • 3A integrated FET
  • Automotive load dump protection
  • Light output temperature compensation
  • LED over-temperature protection
  • LED disconnect
  • PWM/analog light level control
  • Small, 20 Ld 4mmx4mm QFN package
  • AEC-Q100 Compliant
  • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL78100
Basic Information
Production Status
Mass Production
# of Devices/ Channels
1
Total Current for DC/DC Lighting (mA)
1000
Output Current Max/Channel (mA)
1000
Output Voltage Max (V)
32
Brightness Control
DC or PWM
Input Voltage Max (V)
16
Input Voltage Min (V)
2.7
Backlight for LCD Size (min) (in)
3.5
Backlight for LCD Size (max) (in)
9
Qualification Level
Automotive
Peak Efficiency (%)
90
# of LEDs (max)
8
Frequency
1 MHz
IS (max)
3.5 mA
IQ (max)
2.5 µA
ISW (typ) (mA)
3600
Integrated Diode
Yes
Over Voltage Protection
Yes
Topologies
Inductor Boost or Buck
Input Voltage Range (V)
2.7 to 16
Backlight for LCD Size
3.5 to 9
Temperature Range
-40 to +105

Confirm below disclaimers

Input Renesas account name and password