POWER MANAGEMENT
1
SC5014A
High Eciency 2-Channel HB LED Driver with
I
2
C Interface and Direct PWM Dimming
Revision 2.0
Features
Input Voltage — 4.5V to 27V
Output Voltage — Up to 50V
Step-up (Boost) Controller
Ultra-Fast Transient Response (<100μs)
Programmable Switching Frequency
Linear Current Sinks
2 Strings, up to 240mA/String
Current Matching ±1%
Current Accuracy ±2%
PWM Dimming
Direct PWM Dimming, 1000:1 at 1KHz
Input Dimming Frequency 100Hz-30kHz
5-Bits Analog Dimming
I
2
C Interface
Fault Status — Open/Short LED, UVLO, OTP
Protection Features
Open/Shorted LED(s) and adjustable OVP
Over-Temperature and UVLO Shutdown Protection
4mm X 4mm 20-pin QFN Package
Applications
Ultrabooks
TM
, All-in-One PCs, Monitors, Automotive-
Display Backlighting
Backlighting for Mid-Size Displays
Description
The SC5014A is a 2-channel, highly integrated, high-e-
ciency step-up (boost) HB LED driver designed to reduce
the thickness of mid-size LCD displays. It features a wide
input voltage range (4.5V to 27V), direct PWM dimming,
analog dimming, a exible output conguration, an I
2
C
interface, and numerous protection features.
The SC5014A exhibits 2% to 4% higher eciency when
using the same size inductors as existing LED drivers. But,
unlike existing devices, it can also operate with inductors
that are up to 10x smaller without sacricing eciency.
This part can also use very low-prole inductors (as small
as 2.2µH, 1mm height), which allows LED drivers to be
built directly into the LCD panel to enable ultra-thin
displays.
The boost controller, with programmable switching
frequency from 200kHz to 2.2MHz, maximizes eciency
by dynamically minimizing the output voltage while
maintaining LED string current accuracy. It provides
excellent line and load response with no external com-
pensation components. An external resistor adjusts the
current from 40-240mA per string.
U V L O
E -P A D
ISE T
FSET
S C P
S C 5 0 1 4 A
R 3
R 6
FLT
C 3
R E F
FLT
V C C
P G N D
R 11
R 10
R 1
R 2
O V P
IO 2
R 9
R 8
V
IN
=4.5 to 27V
U p to
24 0 m A /S tring
IO 1
IO 1
IO 2
C 5
R 5
P W M I
P W M I
S D A
S C L
For I
2
C
E N
E N
L1
Q 1
R 4
N D R V
C S
D 1
V
O U T
up to 5 0V
V
C C
= 4 .5 to 5 .5V
Typical Application Circuit
