Datasheet

ISL97634
White LED Driver with PWM Dimming

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Key Features

Drives Up to 7 LEDs in Series (3.5V/20mA type)
OVP (14V, 18V, and 26V for 3, 4 and 7 LEDs Applications)
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)

Description

The ISL97634 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 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 3 LEDS, 4 LEDs, and 7 LEDs (3.5V/20mA type) backlight applications respectively. The ISL97634 is specified for operation over the -40°C to +85°C ambient temperature at input voltage from 2.4V to 5.5V.