lx 23 1 08 a data sheet c c o o n n f f i i d d e e n n t t i i a a l l 8 ports led back light high voltage driver www. microsemi . com tm ? lx 23 1 08a l l x x 1 1 9 9 7 7 6 6 www. microsemi . com description key features lx23108 a - is a compact 8 ports w hite or rgb back light led driver , to be used in large displ ay notebooks, lcd monitors, and tv sets. i t is designed to work t ogether with the lx24132 led controller as a chip set , driv ing up to 32 led strings with a variable current of up to 200ma peak . in addition, the lx23108a p rovides the lx24132 led controller with its ports voltage samples , that facilitate the contro l of the led strings supply voltage through an external dc/dc converter ; minimiz ing the power dissipation while regulating the led current s for all 8 strings. c urrent regulation is maintained within a 3 percent . the lx23108a led driver includes 8 high bandwidth c urrent limiter cells with pwm control (on/off signal) . the chip is designed to operate with external sense resistors. such configuration provides maximum flexibility for system designers when scaling up or down the led current s for meeting a wide range of high accuracy application requirements . the lx23108 a led driver enables a wide dimming range , achieved through a combination of led current amplitude and pwm duty - cycle control. in addition, the chipset provides a thermally robust solutio n through advanced system control ; includ ing drain voltage sensing for open/ s horts events and p er s tring thermal protection monitoring. the lx23108a is offered in both 5 x 5 mm and 7x7mm 32 pin qfn package s . ? white led , or rgb backlight driver for large size display panels ? up to 8 led strings with 0.5 % precision current matching . ? wide dimming ratio with pwm duty - cycle and led current amplitude control s . ? 12 bit pwm duty - cycle resolution ? controlled by lx24132 led controller . ? 8 bit res olution for led current setting ? controlled by lx24132 led controller . ? open string , short led and over - temperature protection per individual channel. applications ? lcd monitor and tv ? large signage display important: for the most current data, consult microsemi ?s website: http://www.microsemi.com package order info thermal data lx23108ah ilq mlpq plastic 7 x 7 mm 32 pin t a ( c) - 40 to 85 2 2 .5 c/w according to the jesd51 - 7 the rmal resistance - junction to ambient lx23108a l ilq mlpq plastic 5 x 5 mm 32 pin t a ( c) - 40 to 85 27.5 c/w according to the jes d51 - 7 thermal resistance - junction to ambient rohs compliant / pb - free note: available in tape & reel. append the letters ?tr? to the part number. (i.e. lx23108a ilq - tr) junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc - board system. all of the above assume no ambient airflow.
lx 23 1 08 a data sheet c c o o n n f f i i d d e e n n t t i i a a l l 8 ports led back light high voltage driver www. microsemi . com tm ? lx 23 1 08a l l x x 1 1 9 9 7 7 6 6 www. microsemi . com absolute maximum ratings package pin out v cc supply input voltage ???????.. ???? - 0.5v to 5.5 v v io supply input voltage ???????.. ???? - 0. 5 v to 4.5 v led pins ??????????????????. - 0.3v to 7 0 v all other pins ??????? ???? - 0. 5 v to v io +0.3 up to 4.5 v operating ambient temperature range ??????? - 40 to 85 c maximum operating junction temperature ?.. ?????? 150 c esd protection at all i/o pins ???????? ??+/ - 2kv hbm storage temperature range ???????.. ??? - 65 c to 150 c package peak temperature for solder reflow (40 seconds maximum exposure ) ??. ??????? 260 c (+0, - 5) notes: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal. exposed pad connected to agnd 11 12 13 s6 vd6 vd5 10 s7 9 vd7 30 29 28 vd2 s0 vd1 s1 vd0 31 32 pwm4 pwm5 pwm6 1 pwm0 2 3 4 5 6 7 vdmeas vio vref vcc psel_clk therm_out 24 psel_in 23 22 21 20 19 18 pwm1 pwm2 pwm3 pwm7 8 14 15 16 s5 s4 vd4 psel_out 17 27 26 25 vd3 s3 s2 lx23108al (top view) rohs / pb - free matte tin finish / msl 1 ? 2011 microsemi corp. all rights reserved. for support contact: sales_amsg@microsemi.com visit our web site at: www.microsemi.com
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