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SC5010

High Efficiency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming

Semtech Corporation 

SC5010

POWER MANAGEMENT

High Efficiency 8-Channel LED Driver with

I2C Interface and Phase-Shifted PWM Dimming

Features

Description

 VIN Range — 4.5V to 27V, VOUT Range — Up to 50V

 Step-up (Boost) Controller

 Excellent Transient Response

 Programmable Switching Frequency

 Linear Current Sinks

 8 Strings, up to 30mA/String

 Current Matching ±1%

 Current Accuracy ±1.5%

 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

 5-bit Analog Dimming

 Optional External p-MOSFET Disconnect Switch

 True Load Disconnect and Inrush Current Limiting

 I2C 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(mm) 28-pin QFN Package

The SC5010 is an 8-channel high-precision, high-efficiency

step-up (Boost) LED driver for backlight applications. It fea-

tures wide input voltage range (4.5V to 27V) , flexible output

configuration, wide analog and PWM dimming range,

phase shifting and fading. It also features video signal syn-

chronization (VSYNC), I2C 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 efficiency 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 ±1.5%. An external resistor adjusts the current

from 10-30mA per string. It also features PWM dimming

resolution 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.

Applications

 Notebook PCs, UMPC, LCD Monitors, and Tablet PCs

SC5010 is available in a low-profile, thermally enhanced,

4 X 4 X 0.6(mm) QFN 28-pin package.

Typical Application Circuit

C2

VIN=4.5 to 27V

Q2

(O ptional)

VCC = 4.5 to 5.5V

R1 C1

R2

FLT

EN

For I2C

SYNC

PWMI

R3

C3

R6 R5

R10

R11

C4

R7

L1

2.2μH

DRVP

V IN

DRVN

CS

SC5010

UVLO

VCC

OVP

FLT

EN

SDA

SCL

SYNC

PWMI

BG

SCP

FSET

IS E T

CPLL

IO 1

IO 2

IO 3

IO 4

IO 5

IO 6

IO 7

IO 8

AGND

PGND

D1 VOUT up to 50V

Q 1 4.7μF

C5

R4

R8

R9

Up to

30m A/CH

Revision 1.0

© 2011 Semtech Corporation

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