SC5010 Datasheet, PDF (1/36 Pages) Semtech Corporation – High Effi ciency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming

SC5010
POWER MANAGEMENT
High Efficiency 8-Channel LED Driver with
I²C Interface and Phase-Shifted PWM Dimming
Features
Description
 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
The SC5010 is an 8-channel high-precision, high-efficiency
step-up (Boost) LED driver for backlight applications. It fea-
tures 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 syn-
chronization (VSYNC), I²C interface, and numerous protec-
tion features. An optional disconnect p-MOSFET provides
true load disconnection and inrush current limiting.
The boost controller, with programmable switching fre-
quency from 200kHz to 2.2MHz, maximizes efficiency by
dynamically minimizing the output voltage while maintain-
ing LED string current accuracy. It provides excellent line
and load response with no external compensation compo-
nents. 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.
Applications
 Notebook PCs, UMPC, LCD Monitors, and Tablet PCs
SC5010 is available in a low-profile, thermally enhanced,
4 X 4 X 0.6(mm) QFN 28-pin package.
Typical Application Circuit
C2
VIN=4.5 to 27V
Q2
(O ptional)
VCC = 4.5 to 5.5V
R1 _C1
R2
FLT
EN
For I²C
SYNC
PWMI
R3
C3
R6 R5
R10
R11
C4
R7
L1
2.2μH
DRVP
V IN
DRVN
CS
SC5010
UVLO
VCC
OVP
FLT
EN
SDA
SCL
SYNC
PWMI
BG
SCP
FSET
IS E T
CPLL
IO 1
IO 2
IO 3
IO 4
IO 5
IO 6
IO 7
IO 8
AGND
PGND
D1 V_OUT up to 50V
Q 1 ^4.7μF
C5
R4
R8
R9
Up to
30m A/CH
Revision 1.0
© 2011 Semtech Corporation
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