S P7616
High Accuracy 4-Channel Low Side LED Driver for
CCFL Replacement
May 2009
Rev. 2.0.4
GENERAL DESCRIPTION
The SP7616 is a 30V 4-Channel linear low side
LED driver. It is capable of powering up to four
LED strings of nine LEDs @ 60mA per string
for a total of 36 LEDs with 1.5% typical
current matching between channels. The
desired LED current can be adjusted with an
external resistor, and the precision string-to-
string current matching ensures consistent
color temperature across the whole display.
The device also features very low dropout
voltage to maximize system efficiency and
avoid difficult thermal design constraints.
Dimming can be achieved by feeding a PWM
signal to the PWM pin, or use an analog signal
to control the ISET current, this allows
brightness control without unwanted color
shifts. Fast LED current turn-on/off time allows
up to 5 kHz PWM dimming frequencies with as
low as 10% duty cycle, completely eliminating
flicker. The built-in thermal protection
prevents damage to the device under fault
conditions.
APPLICATIONS
•
CCFL replacement in TFT displays
•
Panel backlighting
•
Casino gaming light systems
•
Advertising backlighting
FEATURES
•
Wide 4.5V to 30V operating range
•
60mA LED current per channel
•
1.5% channel to channel current
matching
•
Analog Dimming control
•
PWM operation up to 5kHz with 10%
Duty Cycle
•
Low dropout: 150mV @ 20mA
•
Built-in Over Temperature Protection
•
Small 2X3mm DFN package
−
Lead Free, RoHS Compliant
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP7616 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
EXAR [ EXAR CORPORATION ]
