Datasheet Intersil EL7801ILZ — Datenblatt

EL7801 ® Data Sheet PRELIMINARY December 22, 2005 FN7354.0 High Power LED Driver Features The EL7801 is a high-power LED backlight driver with an
integrated 36V FET designed to drive up to 8 high-power
LEDs in series while running from a 12V input supply. The
PWM converter runs from an internally generated 1MHz
clock. With efficiencies over 90% the regulator provides tight
control of LED current and may be configured in either boost
or buck topologies, allowing from 1 to 8 series diodes to be
driven from a 12V input. • Drives 1-8 high-power LEDs in series, up to 32V LED light level may be controlled either by: • LED over-temperature protection • 2.7V to 16V input voltage range
• Boost or buck configurable switch
• 3A integrated FET
• Automotive load dump protection
• Light output temperature compensation 1. LED DC bias current set via the LEVEL pin, or • LED disconnect 2. External low frequency PWM control via the
ENABLE/PWM pin. • PWM/analog light level control In both control modes optional over temperature thermal
protection of the LED reduces the LED DC bias current
above a customer set temperature, protecting the LED from
thermal damage. An optional fault monitor drives an external
FET between the input supply and inductor, providing short
circuit current protection for the LED and inductor as well as
load dump protection for automotive applications. For low
cost applications the pass transistor may be omitted and the
fault pin bypassed.
The EL7801 is packaged in a 20 Ld QFN package and is
specified for operation over the -40°C to +85°C temperature …