C O N F I D E N T I A L LX23108A ® TM 8 Ports LED Back Light High Voltage Driver DATA SHEET DESCRIPTION The LX23108A 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. • • • • • The LX23108A is offered in both 5x5mm and 7x7mm 32 pin QFN • packages. • • 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. W W W. Microsemi .CO M LX23108A - 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 LX23108A 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 LX23108A 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. KEY FEATURES 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 LX23108AHILQ MLPQ Plastic 7 x 7mm 32 pin Plastic 5 x5mm 32 pin RoHS Compliant / Pb-free Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX23108AILQ-TR) TA (°C) -40 to 85 22.5 ° C/W According to the JESD51-7 THERMAL RESISTANCE-JUNCTION TO AMBIENT TA (°C) -40 to 85 27.5 ° C/W According to the JESD51-7 THERMAL RESISTANCE-JUNCTION TO AMBIENT 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. LX23108A LX23108ALILQ MLPQ THERMAL DATA C O N F I D E N T I A L LX23108A TM ® 8 Ports LED Back Light High Voltage Driver DATA SHEET S3 VD3 VD1 29 VD2 S1 30 S2 S0 31 28 27 26 25 1 24 PSEL_IN PWM1 2 23 THERM_OUT PWM2 3 22 VDMEAS PWM3 4 21 VIO PWM4 5 20 VREF PWM5 6 19 VCC PWM6 7 18 PSEL_CLK PWM7 8 17 PSEL_OUT 14 15 16 S4 13 VD4 S6 12 S5 11 VD5 10 VD6 9 S7 Exposed Pad Connected to AGND VD7 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. 32 PWM0 W W W. Microsemi .CO M 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) PACKAGE PIN OUT VD0 ABSOLUTE MAXIMUM RATINGS LX23108AL (Top View) RoHS / Pb-free Matte Tin Finish / MSL 1 © 2011 Microsemi Corp. All rights reserved. LX23108A For support contact: [email protected] Visit our web site at: www.microsemi.com