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S P 7 6 0 0
2 A 2 9 V N o n - S y n c . B u c k H i g h P o w e r L E D D r i v e r
March 2009
GENERAL DESCRIPTION
The SP7600 is a non-synchronous voltage
mode PWM step down converter with
integrated high side FET optimized to drive
high power LEDs at up to 2A of continuous
current. A wide 4.5V to 29V input voltage
range allows for single supply operations from
industry standard 5, 12 or 24V power rails.
A 1.2MHz constant operating frequency allows
for small external components selection while
an internal type II control loop compensation
reduces the overall component count and
solution footprint. A low 200mV feedback
reference voltage minimizes power dissipation
in the system while efficiency is mazimized via
a 100% duty cycle capability. Dimming and
shutdown mode is provided via an enable
function when required. An adjustable over
current and under voltage lock out protection
insures safe operations under abnormal
operating conditions.
The SP7600 is pin compatible with Exar’s
XRP7603 and XRP7604, non synchronous buck
high power led drivers respectively rated at
500mA and 1A.
The SP7600 is offered in a compact thermally
enhanced lead free RoHS compliant 8-pin SO
package.
Rev. 2.0.0
APPLICATIONS
? General Lighting and Displays
? Architectural and Accent Lighting
? Medical and Industrial Instrumentation
? Video Projectors
FEATURES
? 2A Continous Output Current Capable
? 4.5V to 29V Single Rail Input Voltage
? 1.2MHz Constant Switching Frequency
? Internal Control Loop Compensation
? 0.2V Feedback Reference Voltage
? 2.5% Output Voltage Accuracy
? Built-in Soft Start
? PWM & Analog Dimming Capability
? Adjustable Over-Current Protection
? Pin Compatible with 500mA rated
XRP7603 & 1A rated XRP7604
? Thermally Enhanced Package
? Lead Free RoHS Compliant 8-pin SO
Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP7600 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
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