SC5010 High Efficiency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming POWER MANAGEMENT Features Description The SC5010 is an 8-channel high-precision, high-efficiency step-up (Boost) LED driver for backlight applications. It features wide input voltage range (4.5V to 27V) , flexible output configuration, wide analog and PWM dimming range, phase shifting and fading. It also features video signal synchronization (VSYNC), I2C interface, and numerous protection features. An optional disconnect p-MOSFET provides true load disconnection and inrush current limiting. VIN Range — 4.5V to 27V, VOUT Range — Up to 50V Step-up (Boost) Controller Excellent Transient Response Programmable Switching Frequency Linear Current Sinks 8 Strings, up to 30mA/String Current Matching ±1% Current Accuracy ±1.5% PWM Dimming String-by-String Phase Shifting Input Dimming Frequency 100Hz-30kHz User Selectable 9 or 10 Bits Dimming Resolution Optional Synchronization to VSYNC/HSYNC Signal 5-bit Analog Dimming Optional External p-MOSFET Disconnect Switch True Load Disconnect and Inrush Current Limiting I2C Interface Fault Status — Open/Short LED, UVLO, OTP Device Control — SYNC Freq, PLL Setting Protection Features Open/Shorted LED(s) and adjustable OVP Over-Temperature and UVLO Shutdown Protection 4 X 4(mm) 28-pin QFN Package Applications The boost controller, with programmable switching frequency from 200kHz to 2.2MHz, maximizes efficiency by dynamically minimizing the output voltage while maintaining LED string current accuracy. It provides excellent line and load response with no external compensation components. Each linear current sink is matched within ±1% for superb lighting uniformity, and the accuracy of each string current is ±1.5%. An external resistor adjusts the current from 10-30mA per string. It also features PWM dimming resolution of 9 or 10 bits (user selectable) over dimming frequency from 100Hz to 20kHz, synchronized to the SYNC signal or the boost oscillator. String-by-string phase shifting reduces the demand on the input/output capacitance, decreases EMI, and improves dimming linearity. SC5010 is available in a low-profile, thermally enhanced, 4 X 4 X 0.6(mm) QFN 28-pin package. Notebook PCs, UMPC, LCD Monitors, and Tablet PCs Typical Application Circuit D 1 V O U T u p to 5 0 V L1 V IN = 4 .5 to 2 7 V 2.2μH Q2 (O p tio n a l) C2 DRVP DRVN V IN R1 R2 V C C = 4 .5 to 5 .5 V R3 FLT EN SYNC OVP FLT IO 1 BG R5 R10 R11 C4 R7 R8 R9 PW MI C3 C5 R4 SC5010 VCC SYNC R6 Revision 1.0 UVLO EN SDA SCL F o r I2C PW MI C1 4.7μF Q1 CS IO 2 IO 3 IO 4 U p to 3 0 m A /C H IO 5 IO 6 SCP FSET IS E T CPLL IO 7 IO 8 AGND PGND © 2011 Semtech Corporation 1