C O N F I D E N T I A L LX23108AL ® TM 8 Ports LED Back Light High Voltage Driver DATA SHEET DESCRIPTION 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. • • • • • The LX23108AL LED Driver is housed in a 32 pin, 5mmx5mm QFN • package. • • 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 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. KEY FEATURES APPLICATIONS LCD Monitor and TV Large Signage Display IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com -40 to 85 THERMAL DATA 27.5 ° C/W According to the JESD51-7 RoHS Compliant / Pb-free / MSL 1 THERMAL RESISTANCE-JUNCTION TO AMBIENT LX23108ALILQ 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. Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX23108ALILQ-TR) LX23108AL TA (°C) PACKAGE ORDER INFO MLPQ Plastic 5 x5mm 32 pin C O N F I D E N T I A L LX23108AL TM ® 8 Ports LED Back Light High Voltage Driver DATA SHEET S0 S1 VD1 VD2 S2 S3 VD3 32 31 30 29 28 27 26 25 PWM0 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 VD4 S6 13 S4 S7 12 S5 11 VD5 10 VD6 9 VD7 Exposed Pad Connected to AGND W W W. Microsemi .CO M 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. PACKAGE PIN OUT VD0 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) (Top View) RoHS / Pb-free Matte Tin Finish / MSL 1 © 2010 Microsemi Corp. All rights reserved. For support contact: [email protected] Visit our web site at: www.microsemi.com LX23108AL