SC441A datasheet, PDF - EEWORLD Datasheet

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SC441A: DescriptionLED DISPLAY DRIVER, PDSO20; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size79KB，1 Pages; ManufacturerSEMTECH; Websitehttp://www.semtech.com

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SC441A Overview

LED DISPLAY DRIVER, PDSO20

SC441A Parametric

Parameter Name	Attribute value
Maker	SEMTECH
Parts packaging code	TSSOP
package instruction	ROHS COMPLIANT, TSSOP-20
Contacts	20
Reach Compliance Code	unknow
ECCN code	EAR99
Interface integrated circuit type	LED DISPLAY DRIVER
JESD-30 code	R-PDSO-G20
Multiplex display function	NO
Number of functions	1
Number of segments	4
Number of terminals	20
Package body material	PLASTIC/EPOXY
encapsulated code	HSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, HEAT SINK/SLUG
Certification status	Not Qualified
Maximum supply voltage	21 V
Minimum supply voltage	4.5 V
surface mount	YES
Terminal form	GULL WING
Terminal location	DUAL

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SC441A

POWER MANAGEMENT

Features

High Efficiency Integrated Driver for

4-Strings of 150mA LEDs

Description

The SC441A is a high-efficiency multiple string WLED driv-

er 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 3.0A 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 efficiency 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 700KHz switching frequency enables the user to op-

timize the external component sizes for efficiency. 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 SC441A 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, unaffected

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 SC441A is available in a thermally-enhanced TSSOP-

20 EDP package.

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% efficiency

Wide 0.2% to 100% PWM dimming range

Possible analog dimming

Integrated 3.0A power switch

700KHz switching frequency for small size

Adjustable OVP for cost-effective output cap selection

Open/short LED protection

Thermal protection with auto-recovery

Thermally enhanced TSSOP-20 EDP package

Fully WEEE and RoHS compliant

AEC-Q100 Grade 3 qualified

Applications

Medium-sized LCD panel

Notebook Display

Automotive Car Navigation Display

Sub-Notebook and Tablet Computer Displays

Portable Media Players

Typical Application Circuit

Vin (4.5V -21V)

VIN

FFLAG

PWM

OVPRTN

VOUT

OVPIN

4 Strings

SC441A

COMP

IO1-4

IO1- 4

IOSET

AGND

EDP

PGND

IOGND

PGND

January 18, 2010

www.semtech.com

SC441A Related Products

	SC441A	SC441AEVB
Description	LED DISPLAY DRIVER, PDSO20	LED DISPLAY DRIVER, PDSO20
Number of functions	1	1
Number of terminals	20	20
Maximum supply voltage	21 V	21 V
Minimum supply voltage	4.5 V	4.5 V
surface mount	YES	YES
Terminal form	GULL WING	GULL WING
Terminal location	DUAL	DUAL

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