SC5014A Datasheet, PDF (1/27 Pages) Semtech Corporation – High Efficiency 2-Channel HB LED Driver with I2C Interface and Direct PWM Dimming

SC5014A
POWER MANAGEMENT
Features
High Efficiency 2-Channel HB LED Driver with
I²C Interface and Direct PWM Dimming
Description
 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
 I²C 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
The SC5014A is a 2-channel, highly integrated, high-effi-
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 flexible output configuration, an I²C
interface, and numerous protection features.
The SC5014A 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 sacrificing efficiency.
This part can also use very low-profile 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 efficiency
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.
Typical Application Circuit
V IN=4.5 to 27V
VCC = 4.5 to 5.5V
R1
R2
FLT
EN
For I²C
PWMI
R3
C3
R6 R5
R10
R11
L1
UVLO
NDRV
CS
VCC
FLT ^SC5014A
EN
SDA
SCL
PWMI
OVP
IO 1
IO 1
REF
IO 2
SCP
FSET
IS E T
IO 2
E -P A D
PGND
D1 VOUT up to 50V
Q1
R4
R9
C5
R8
Up to
240m A/String
Revision 2.0