SC654 datasheet(1/22 Pages) SEMTECH

tên linh kiện	SC654

Giải thích chi tiết về linh kiện	Light Management Unit for 6 LEDs with SemPulseTM Interface

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nhà sản xuất	SEMTECH [Semtech Corporation]

Trang chủ	http://www.semtech.com

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POWER MANAGEMENT

1

US Patents: 6,504,422; 6,794,926

Typical Application Circuit

SC654

Light Management Unit for

6 LEDs with SemPulseTM Interface

SC654

IN

SPIF

GND

OUT

BL1

BL5

CIN

2.2μF

BL6

C1+

From

Microprocessor

VBAT = 2.9 to 5.5V

COUT

2.2μF

C2

2.2μF

C1

2.2μF

BL2

BL3

BL4

C2+

C1-

C2-

Features

Input supply voltage range — 2.9V to 5.5V

Very high efficiency charge pump driver system with

three modes — 1x, 1.5x and 2x

Six programmable current sinks — 0mA to 25mA

Up to three LED grouping options

Fade-in/fade-out feature for main LED bank

Charge pump frequency — 250kHz

SemPulse single wire interface

Backlight current accuracy — ±1.5% typical

Backlight current matching — ±0.5% typical

LED float detection

Automatic sleep mode (LEDs off ) — I

Q

= 60μA (typ.)

Shutdown current — 0.1μA (typical)

Ultra-thin package — 2 x 2 x 0.6 (mm)

Fully WEEE and RoHS compliant

Applications

Cellular phones, smart phones, and PDAs

LCD modules

Portable media players

Digital cameras

Personal navigation devices

Display/keypad backlighting and LED indicators

Description

The SC654 is a high efficiency charge pump LED driver

using Semtech’s proprietary charge pump technology.

Performance is optimized for use in single-cell Li-ion

battery applications.

The charge pump provides backlight current utilizing six

matched current sinks. The load and supply conditions

determine whether the charge pump operates in 1x, 1.5x,

or 2x mode. An optional fading feature that gradually

adjusts the backlight current is provided to simplify

control software.

The SC654 uses the proprietary SemPulseTM single wire

interface to control all functions of the device, including

backlight currents. The single wire interface minimizes

microcontroller and interface pin counts. The six LEDs

can be grouped in up to three separate banks that can be

independently controlled.

The SC654 enters sleep mode when all the LED drivers are

disabled. In this mode, the quiescent current is reduced

while the device continues to monitor the SemPulse

interface.

With a 2 x 2 (mm) package and four small capacitors, the

SC654 provides a complete LED driver solution with a

minimal PCB footprint.

January 30, 2009

Số phần tương tự - SC654

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Semtech Corporation	SC652	287Kb / 16P	Backlight Driver for 5 LEDs with Charge Pump and PWM Control
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