Date: 16/08/2012

Backlight LED drivers operate at low 2.4V from a single cell Li-ion batt

New Backlight LED drivers from Intersil operate from the low input voltage of 2.4 Volts from a single cell Li-ion battery.

With a low quiescent current of 0.8mA, the new ISL97692/3/4A series of LED drivers ISL97692 incorporates four channels with up to 40mA each, while the ISL97693 and ISL97694A provide six channels with up to 30mA each. All the drivers feature output current phase shifting which maximizes efficiency during PWM dimming and increases the effective output current frequency to eliminate audible noise. Additionally, when operating from a single cell Li-Ion battery, the drivers do not require any input voltage other than the battery, reducing board size and component count.

Other Features:
90% efficient with 3.7V input, driving 6-parallel, 5-series LED configuration at 20mA/LED
Wide dimming range down to 0.025% duty cycle at 5kHz frequency
Phase shifting multiplies the effective dimming frequency by the number of channels, permitting ultrasonic PWM dimming with 10-bit dimming resolution

Price and Availability: The ISL97692 and ISL97693 are available now in 16-lead TQFN packages. The ISL97694A is available in a 20-lead TQFN package. Prices start at $1.20 each in 1,000-unit quantities.