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
生产状态
Mass Production
器件/通道数量
6
DC/DC照明总电流 (mA)
300
输出电流最大值/通道 (mA)
50
输出电压最大值 (V)
45
亮度控制
PWM
输入电压最大值 (V)
26.5
输入电压最小值 (V)
4.5
LCD背光尺寸 (最小值) (英寸)
0
LCD背光尺寸 (最大值) (英寸)
17
资质级别
Standard
峰值效率 (%)
92.9
LED数量 (最大值)
78
频率
0.6/1.2 MHz
IS (最大值)
5 mA
IQ (最大值)
5 µA
ISW (典型值) (mA)
2000
集成二极管
No
过压保护
Yes
故障开关
Yes
拓扑
Inductor Boost
输入电压范围 (V)
4.5 to 26.5
LCD背光尺寸
up to 17
CAN 采样
YES
温度范围
-40 to +85

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