POWER MANAGEMENT
1
SC5014
High Eciency 4-Channel HB LED Driver with
I
2
C Interface and Phase-Shifted 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
4 Strings, up to 120mA/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
5-Bits Analog Dimming
I
2
C Interface
Fault Status — Open/Short LED, UVLO, OTP
Device Control: PLL Setting
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 SC5014 is a 4-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), phase-shifted PWM
dimming, analog dimming, a exible output congura-
tion, an I
2
C interface, and numerous protection features.
The SC5014 exhibits 2% to 4% higher efficiency 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 fre-
quency from 200kHz to 2.2MHz, maximizes eciency by
dynamically minimizing the output voltage while main-
taining LED string current accuracy. It provides excellent
line and load response with no external compensation
components. An external resistor adjusts the current from
20-120mA per string. It also features PWM dimming reso-
lution of 9 or 10-bits (user selectable) over a dimming fre-
quency from 100Hz to 20kHz, synchronized to the boost
oscillator. String-by-string phase shifting reduces the
demand on the input/output capacitance, decreases EMI,
and improves dimming linearity.
UVLO
E-PAD
ISET
FSET
CPLL
SCP
SC5014
R3
R6
FLT
C3
REF
FLT
VCC
PGND
R11
R7
C4
R10
R1
R2
OVP
IO4
R9
R8
V
IN
=4.5 to 27V
Up to
120mA/String
IO1
IO2
IO3
C5
R5
PWMI
PWMI
SDA
SCL
For I
2
C
EN
EN
L1
Q1
R4
NDRV
CS
D1
V
OUT
up to 50V
V
CC
= 4.5 to 5.5V
Typical Application Circuit
