LX23108AL

C ONFIDENTIAL LX23108AL TM ® 8 Ports LED Back Light High Voltage Driver D ATA S HEET KEY FEATURES • • • • • 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 controls. 12 bit PWM duty-cycle resolution – controlled by LX24132 LED Controller. 8 bit resolution for LED current setting – controlled by LX24132 LED Controller. Open string, short LED and OverTemperature protection per individual channel. APPLICATIONS LCD Monitor and TV Large Signage Display DESCRIPTION LX23108AL - is a compact 8 Ports White or RGB back light LED Driver, to be used in large display notebooks, LCD monitors, and TV sets. It is designed to work together with the LX24132 LED Controller as a chipset, driving up to 32 LED strings with a variable current of up to 200mA peak. In addition, the LX23108AL provides the LX24132 LED Controller with its ports voltage samples, that facilitate the control of the LED strings supply voltage through an external DC/DC converter; minimizing the power dissipation while regulating the LED currents for all 8 strings. Current regulation is maintained within a ± 3 percent. The LX23108AL LED Driver includes 8 High Bandwidth Current 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 currents for meeting a wide range of high accuracy application requirements. The LX23108AL 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 solution through advanced system control; including Drain Voltage Sensing for Open/Shorts events and per string Thermal Protection monitoring. W W W. Microsemi . CO M The LX23108AL LED Driver is housed in a 32 pin, 5mmx5mm QFN • package. • • IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com LX23108AL TA (°C) -40 to 85 PACKAGE ORDER INFO MLPQ Plastic 5 x5mm 32 pin RoHS Compliant / Pb-free / MSL 1 THERMAL DATA 27.5 ° C/W According to the JESD51-7 THERMAL RESISTANCE-JUNCTION TO AMBIENT LX23108ALILQ Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX23108ALILQ-TR) Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. C ONFIDENTIAL LX23108AL TM ® 8 Ports LED Back Light High Voltage Driver D ATA S HEET PACKAGE PIN OUT VD0 VD1 VD2 S0 S1 VD3 25 ABSOLUTE MAXIMUM RATINGS VCC Supply Input Voltage …………………..…………-0.5V to 5.5V VIO Supply Input Voltage …………………..………… -0.5V to 4.5V LED Pins………………………………………………. -0.3V to 70V All other pins ……………………………-0.5V to VIO+0.3 up to 4.5V 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) S2 27 32 31 30 29 28 S3 26 W W W. Microsemi . CO M PWM0 PWM1 PWM2 PWM3 PWM4 PWM5 PWM6 PWM7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 24 23 22 PSEL_IN THERM_OUT VDMEAS VIO VREF VCC PSEL_CLK PSEL_OUT Exposed Pad Connected to AGND 21 20 19 18 17 S5 S4 VD6 VD7 (Top View) RoHS / Pb-free Matte Tin Finish / MSL 1 © 2010 Microsemi Corp. All rights reserved. For support contact: sales_AMSG@microsemi.com Visit our web site at: www.microsemi.com VD5 VD4 S7 S6 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. LX23108AL