ISL78100

High Power LED Driver

Product Status: Mass Production

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
生产状态
Mass Production
器件/通道数量
1
DC/DC照明总电流 (mA)
1000
输出电流最大值/通道 (mA)
1000
输出电压最大值 (V)
32
亮度控制
DC or PWM
输入电压最大值 (V)
16
输入电压最小值 (V)
2.7
LCD背光尺寸 (最小值) (英寸)
3.5
LCD背光尺寸 (最大值) (英寸)
9
资质级别
Automotive
峰值效率 (%)
90
LED数量 (最大值)
8
频率
1 MHz
IS (最大值)
3.5 mA
IQ (最大值)
2.5 µA
ISW (典型值) (mA)
3600
集成二极管
Yes
过压保护
Yes
拓扑
Inductor Boost or Buck
输入电压范围 (V)
2.7 to 16
LCD背光尺寸
3.5 to 9
温度范围
-40 to +105

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