© 2011 Semtech Corporation
POWER MANAGEMENT
1
SC5010H
High Eciency 8-Channel LED Driver with
I
2
C Interface and Phase-Shifted PWM Dimming
Features
V
IN
Range — 4.5V to 27V, V
OUT
Range — Up to 50V
Step-up (Boost) Controller
Ultra-Fast Transient Response
Integrated Soft-start
Programmable Switching Frequency
Linear Current Sinks
8 Strings, up to 50mA/String
Current Matching ±1%
Current Accuracy ±2%
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
Optional External p-MOSFET Disconnect Switch
True Load Disconnect and Inrush Current Limiting
I
2
C 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 X 0.6 (mm) 28-pin QFN Package
Applications
Notebook PCs, UMPC, LCD Monitors, and Tablet PCs
Description
The SC5010H is an 8-channel high-precision, high-eciency
step-up (Boost) LED driver for backlight applications. It fea-
tures wide input voltage range (4.5V to 27V) , exible output
configuration, wide analog and PWM dimming range,
phase shifting and fading. It also features video signal syn-
chronization (VSYNC), I
2
C 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 eciency 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 ±2%. An external resistor adjusts the current from
10-50mA per string. It also features PWM dimming resolu-
tion 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.
SC5010H is available in a low-prole, thermally enhanced,
4 X 4 X 0.6(mm) QFN 28-pin package.
U V LO
A G N D
ISE T
FS E T
C P LL
S C P
D R V P
V IN
S C 5 0 1 0 H
R 3
R 6
FLT
C 3
B G
FLT
V C C
P G N D
R 1 1
R 7
C 4
R 1 0
R 1
R 2
C 1
Q 2
C 2
O V P
IO 8
IO 1
R 9
R 8
V
IN
=4.5 to 2 7 V
U p to
50m A /C H
IO 2
IO 3
IO 4
IO 5
IO 6
C 5
IO 7
R 5
P W M I
P W M I
S Y N C
S Y N C
S D A
S C L
For I
2
C
E N
E N
L1
Q 1
R 4
D R V N
C S
D 1
V
O U T
up to 5 0 V
V
C C
= 4.5 to 5.5V
(O ptio n a l)
Typical Application Circuit
Revision 1.0
