SC441 Semtech Corporation, SC441 Datasheet

SC441

Manufacturer Part Number

SC441

Description

High Effi ciency Integrated Driver

Manufacturer

Semtech Corporation

Datasheet

1.SC441.pdf (1 pages)

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POWER MANAGEMENT

Features

Applications

Typical Application Circuit

April 26, 2007

Wide input voltage range from 4.5V to 21V

36V maximum output voltage

Drives up to 40 WLEDs in 4 strings

Programmable LED current for up to 150mA per

string

+/- 2% string-to-string current matching

Up to 90% effi ciency

Wide 0.2% to 100% PWM dimming range

Possible analog dimming

Integrated 2.5A power switch

800kHz switching frequency for small size

Adjustable OVP for cost-eff ective output cap selection

Open/short LED protection

Thermal protection with auto-recovery

Thermally enhanced TSSOP-20 EDP package

Fully WEEE and RoHS compliant

Medium-sized LCD panel

Notebook Display

Automotive Car Navigation Display

Sub-Notebook and Tablet Computer Displays

Portable Media Players

Vin (4.5V -21V)

VIN

COMP

FFLAG

PWM

COMP

EDP

PGND

SC441

High Effi ciency Integrated Driver for

PGND

OVPRTN

OVPIN

IOGND

OVPIN

IO1- 4

IOSET

AGND

VOUT

AGND

VOUT

IO1-4

Description

The SC441 is a high-effi ciency multiple string WLED driver

with an integrated boost converter. It operates over a

wide input range from 4.5V to 21V with a maximum out-

put voltage of 36V and a 2.5A internal power switch. It

can drive up to forty WLEDs in 4 strings with current up

to 150mA per string. The string-to-string current match-

ing is 2% typical, 3% maximum. The overall effi ciency is

greater than 90% due to the low current sense voltage

and a low-impedance internal power switch. The wide

PWM dimming range boasts a ratio of 500: 1.

The 800kHz switching frequency enables the user to op-

timize the external component sizes for effi ciency. When

there are fewer than 10 LEDs in each string, users can ad-

just the output voltage protection yielding an allowable

reduction in associated costs, size and voltage ratings of

the output capacitor.

The SC441 also features comprehensive open and short-

circuit LED protection functions. It disables the corre-

sponding strings with LED open or LED short conditions

while maintaining normal operation of other, unaff ected

LED strings. This feature allows LCD panels to remain view-

able even under LED failure, wire disconnect, or short-cir-

cuit conditions. The internal thermal shutdown protects

the IC from overheating at abnormal conditions.

The SC441 is available in a thermally-enhanced TSSOP-20

EDP package.

4-Strings of 150mA LEDs

4 Strings

SC441

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