SC5012 Datasheet, PDF (1/1 Pages) Semtech Corporation – High Efficiency 4-Ch, 150mA/Ch LED Driver with I2C Interface and Phase-Shifted PWM Dimming

SC5012
POWER MANAGEMENT
High Efficiency 4-Ch, 150mA/Ch LED Driver with
I²C Interface and Phase-Shifted PWM Dimming
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
 Medium-sized LCD Panel
 Automotive Car Navigation/Information Display
 LCD Monitors
Typical Application Circuit
V IN 4.75 to 45V
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 fre-
quency from 200kHz to 2.2MHz, can maximize efficiency
by dynamically minimizing the output voltage while
maintaining LED string current accuracy. It provides excel-
lent line and load response with no external compensa-
tion components. Each linear current sink is matched
within ±1% for superb lighting uniformity, and the accu-
racy of each string current is ±2%. An external resistor
adjusts the current from 40-150mA per string. It also fea-
tures PWM dimming resolution of 9 or 10 bits (user select-
able) 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.
L1
C1
SCP
R4
VOUT up
to 65V
EN
V IN
VLDO
R5 _C21
R24 ^C20
R9
Q1
R6
R8
C4
R7
FSYNC
I²C
I²C
SYNC
PWMI
DRVN
CS
VCC
FLT
FSET
ISET SC 5012
SS
CPLL
FSYNC
SDA
SCL
SYNC
PWMI
AGND
PGND
OVP
IO 1
IO 2
IO 3
IO 4
R15
C22
R10
FLT
VLDO
R11
Up to
150m A/CH
C6
Revision 2.2
© 2012 Semtech Corporation