SC5012 データシートの表示（PDF） - Semtech Corporation
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SC5012
Semtech Corporation
SC5012 Datasheet PDF : 1 Pages
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SC5012
SC5012Q
High Efficiency 4-Ch, 150mA/Ch LED Driver with
POWER MANAGEMENT
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
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
(4.75V 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.
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
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.
AEC-Q100 Qualified Version Available
Applications
SC5012/Q is available in 4mm X 4mm 24 Ld QFN package.
Medium-sized LCD Panel
The SC5012Q is an AEC-Q100 qualified version.
Automotive Car Navigation/Information Display
LCD Monitors
Automotive AEC-Q100 Qualified Application
Typical Application Circuit
VIN 4.75 to 45V
L1
C1
SCP
R4
VOUT up
to 65V
EN
VIN
VLDO
R5 C21
R24 C20
R9 Q1
R6
R8
C4
R7
FSYNC
I2C
I2C
SYNC
PWMI
DRVN
CS
VCC
FLT
FSET
ISET SC5012
SC5012Q SS
CPLL
FSYNC
SDA
SCL
SYNC
PWMI
AGND
PGND
OVP
IO1
IO2
IO3
IO4
R15
C22
R10
FLT
VLDO
R11
Up to
150mA/CH
C6
Revision 2.3
© 2013 Semtech Corporation
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