SC5014AEVB データシートの表示（PDF） - Semtech Corporation

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SC5014AEVB

High Efficiency 2-Channel HB LED Driver with I2C Interface and Direct PWM Dimming

Semtech Corporation 

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

 UltrabooksTM, 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



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