Datasheet ISL97634 (Intersil)

DATASHEET ISL97634 FN6264 White LED Driver with Wide PWM Dimming Range Rev 4.00 August 27, 2013 The ISL97634 represents an efficient and highly integrated Features PWM boost LED driver that is suitable for LED backlighting in small size LCD panels. With integrated Schottky diode, OVP, •Drives Up to 26V Output and wide range of PWM dimming capability, the ISL97634 •Integrated over-voltage protection (OVP) of 14V, 18V, and provides a simple, reliable, and flexible solution to the 26V for various number of LEDs in series backlight designers. • PWM Dimming Control From DC to 32kHz The ISL97634 features a wide range of PWM dimming control • Output Disconnect Switch capability. It allows dimming frequency as low as DC to 32kHz beyond audible spectrum. The ISL97634 also features a • Integrated Schottky Diode feedback disconnect switch to prevent the output from being • 2.4V to 5.5V Input modulated by the PWM dimming signal that minimizes system • 85% Efficiency disturbance. • 1.4MHz Switching Frequency Allows Small LC The ISL97634 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are • 1µA Shutdown Current suitable for various number of LEDs in series. The ISL97634 is • Internally Compensated specified for operation over the -40°C to +85°C ambient • 8 Ld TDFN (2mmx3mm) temperature at input voltage from 2.4V to 5.5V. • Pb-Free (RoHS Compliant) Related Literature Applications • See TB470, “Using the ISL97634 White LED Driver Demo Board” • LED Backlighting for: - Cell phones - Smartphones - MP3 - PMP - Automotive Navigation Panel - Portable GPS
10µH or 22µH VIN VIN LX PWM/EN VOUT NC FBSW FB GND
FIGURE 1. TYPICAL APPLICATION CIRCUIT FN6264 Rev 4.00 Page 1 of 12 August 27, 2013