Datasheet

ISL97632
LED Driver with 1-Wire Dimming

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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)

Description

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.