© 2014 Semtech Corporation
POWER MANAGEMENT
1
High E ciency 4-Ch, 150mA/Ch LED Driver with
I
2
C Interface and Phase-Shifted PWM Dimming
Revision 2.9
SC5012Q
SC5012
Input Voltage — 4.5V 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
5000:1 dimming ratio
String-by-String Phase Shifting
Dimming Frequency 100Hz-30kHz
User Selectable 9 or 10 Bits Dimming Resolution
Optional Synchronization to VSYNC Signal
External Frequency Synchronization, FSYNC
8-bit Analog Dimming
I
2
C 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
AEC-Q100 (Grade2) Quali ed Version Available
Description
The SC5012/Q is a 4-channel high-precision, high-effi-
ciency step-up (Boost) HB LED driver designed for back-
light applications. It features wide input voltage range
(4.5V to 45V) , exible output con guration, wide analog
and PWM dimming range, phase shifting, optional fading,
external boost controller frequency synchronization
(FSYNC), I
2
C interface, and numerous protection features.
The boost controller, with programmable switching fre-
quency from 200kHz to 2.2MHz, can maximize e ciency
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/Q is available in 4mm
X
4mm 24 Ld QFN package.
The SC5012Q is an AEC-Q100 (Grade2) quali ed version.
Typical Application Circuit
DRVN
CS
AGND
ISET
FSET
CPLL
SCP
VIN
SC5012
PWMIPWMI
R15
R4
R5
FLT
C21
VLDO
FLT
VCC
SS
SDA
PGND
R8
R7
C4
R6
R9
Q1
C1
L1
SYNC
SYNC
OVP
R10
R11
V
OUT
up
to 65V
V
IN
4.5 to 45V
Up to
150mA/CH
I
2
C
SCL
I
2
C
IO1
IO2
IO3
C6
IO4
FSYNC
FSYNC
EN
C22
R24
C20
VLDO
SC5012Q
Features
Applications
Medium-sized LCD Panel
Automotive Car Navigation/Information Display
LCD Monitors
