ISL97632

LED Driver with 1-Wire Dimming

OVERVIEW

The ISL97632 represents an efficient and highly integrated PWM boost LED driver that is suitable for 1.8" to 3.5" LCDs that employ 2 to 7 white LEDs for backlighting. With integrated Schottky diode, OVP, and dynamic digital dimming capability, the ISL97632 provides a simple, reliable, and flexible solution to the backlight designers.

The ISL97632 features a simple 1-Wire digital interface that provides a 5-bit dimming control. The dimming signal adjusts the FB voltage and therefore the LED brightness in a DC manner in 32 linear steps. An EN pin can be used to provide a zero brightness setting or shutdown power saving function.

The ISL97632 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for 3, 4, and 7 LEDs (3.5V/20mA type) backlight applications respectively. The ISL97632 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.

KEY FEATURES

  • 1-Wire 5-Bit Digital Dimming
  • Drives Up to 7 LEDs in Series (3.5V/20mA type)
  • OVP (14V, 18V and 26V for 3, 4, and 7 LEDs applications)
  • Integrated Schottky Diode
  • 2.4V to 5.5V input
  • 86% Efficiency
  • 1.4MHz Switching Frequency Allows Small LC
  • Enable for Shutdown Function or Zero Brightness Setting
  • 1µA Shutdown Current
  • Internally Compensated
  • 8 Ld TDFN (2mmx3mm)
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97632
Basic Information
生产状态
Mass Production
器件/通道数量
1
DC/DC照明总电流 (mA)
40
输出电流最大值/通道 (mA)
40
输出电压最大值 (V)
27
亮度控制
Digital 5-Bit Dimming
总线/输出接口
Single Wire
输入电压最大值 (V)
5.5
输入电压最小值 (V)
2.4
LCD背光尺寸 (最小值) (英寸)
1.8
LCD背光尺寸 (最大值) (英寸)
3.5
资质级别
Standard
峰值效率 (%)
86
LED数量 (最大值)
7
频率
1.4 MHz
IS (最大值)
1.5 mA
IQ (最大值)
1 µA
ISW (典型值) (mA)
470
集成二极管
Yes
过压保护
Yes
故障开关
Yes
拓扑
Inductor Boost
输入电压范围 (V)
2.4 to 5.5
LCD背光尺寸
1.8 to 3.5
CAN 采样
YES
温度范围
-40 to +85

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