SC5012 High Efficiency 4-Ch, 150mA/Ch LED Driver with I2C Interface and Phase-Shifted PWM Dimming POWER MANAGEMENT Features Description Input Voltage — 4.75V to 45V Output Voltage — Up to 65V Step-up (Boost) Controller Ultra-Fast Transient Response Programmable Switching Frequency External Sync Frequency for Boost Controller Linear Current Sinks 4 Strings, up to 150mA/String Current Matching ±1% Current Accuracy ±2% PWM Dimming String-by-String Phase Shifting Dimming Frequency 100Hz-30kHz User Selectable 9 or 10 Bits Dimming Resolution Optional Synchronization to VSYNC/HSYNC Signal External Frequency Synchronization, FSYNC 8-bit Analog Dimming I2C Interface Fault Status — Open/Short LED, OTP Device Control: SYNC Freq, PLL Setting Protection Features Open/Shorted LED(s) and adjustable OVP Over-Temperature 4mm X 4mm 24 Ld QFN Package Applications The SC5012 is a 4-channel high-precision, high-efficiency step-up (Boost) HB LED driver designed for backlight applications. It features wide input voltage range (4.75V to 45V) , flexible output configuration, wide analog and PWM dimming range, phase shifting, optional fading, external boost controller frequency synchronization (FSYNC), I2C interface, and numerous protection features. The boost controller, with programmable switching frequency from 200kHz to 2.2MHz, can maximize 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 ±2%. An external resistor adjusts the current from 40-150mA per string. It also features PWM dimming resolution of 9 or 10 bits (user selectable) over a 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. SC5012 is available in 4mm X 4mm 24 Ld QFN package. Medium-sized LCD Panel Automotive Car Navigation/Information Display LCD Monitors Typical Application Circuit V IN 4 .7 5 to 4 5 V L1 C1 R4 SCP V IN R5 EN C21 VLDO C20 R24 DRVN Q1 R9 CS R6 R8 C4 FSYNC R7 FSYNC SDA I2C SCL PW MI SYNC PW MI AGND PGND Revision 2.2 FLT FLT VLDO R15 FSET I2C SYNC VCC IS E T S C 5 0 1 2 CPLL V OUT up to 6 5 V C22 SS R11 OVP R10 IO 1 IO 2 IO 3 U p to 1 5 0 m A /C H C6 IO 4 © 2012 Semtech Corporation