ISL97634

White LED Driver with PWM Dimming

OVERVIEW

The ISL97634 represents an efficient and highly integrated PWM boost LED driver that is suitable for LED backlighting in small size LCD panels. With integrated Schottky diode, OVP, and wide range of PWM dimming capability, the ISL97634 provides a simple, reliable, and flexible solution to the backlight designers.

The ISL97634 features a wide range of PWM dimming control capability. It allows dimming frequency as low as DC to 32kHz beyond audible spectrum. The ISL97634 also features a feedback disconnect switch to prevent the output from being modulated by the PWM dimming signal that minimizes system disturbance.

The ISL97634 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for various number of LEDs in series. The ISL97634 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.

KEY FEATURES

  • Drives Up to 26V Output
  • Integrated over-voltage protection (OVP) of 14V, 18V, and 26V for various number of LEDs in series
  • PWM Dimming Control From DC to 32kHz
  • Output Disconnect Switch
  • Integrated Schottky Diode
  • 2.4V to 5.5V Input
  • 85% Efficiency
  • 1.4MHz Switching Frequency Allows Small LC
  • 1µA Shutdown Current
  • Internally Compensated
  • 8 Ld TDFN (2mmx3mm)
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL97634
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
PWM DC to 32kHz
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 (%)
85
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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