SC658ULTRT Semtech, SC658ULTRT Datasheet

SC658ULTRT

Manufacturer Part Number

SC658ULTRT

Description

Backlight Driver For 4 LEDs With SemPulseTM Interface

Manufacturer

Semtech

Datasheets

1.SC658.pdf (22 pages)

2.SC658ULTRT.pdf (22 pages)

Current page: 1 of 22
Download datasheet (524Kb)

POWER MANAGEMENT

Features



Applications



Typical Application Circuit

April 3, 2009

Input supply voltage range — 2.9V to 5.5V

Very high efficiency charge pump driver system with

three modes — x, .5x and 2x

Four 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 — ±.5% typical

Backlight current matching — ±0.5% typical

LED float detection

Automatic sleep mode (LEDs off )

Shutdown current — 0.µA (typical)

Ultra-thin package — 2 x 2 x 0.6 (mm)

Fully WEEE and RoHS compliant

Cellular phones, smart phones, and PDAs

LCD modules

Portable media players

Digital cameras

Personal navigation devices

Display/keypad backlighting and LED indicators

BAT

2.2µF

= 2.9 to 5.5V

Microprocessor

From

—

2.2µF

= 60µA (typ.)

C1+

SPIF

GND

C1-

SC658

C2+

OUT

C2-

BL1

BL2

BL3

BL4

Description

The SC658 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 four

matched current sinks. The load and supply conditions

determine whether the charge pump operates in x, .5x,

or 2x mode. An optional fading feature that gradually

adjusts the backlight current is provided to simplify

control software.

The SC658 uses the proprietary SemPulse

interface to control all functions of the device, including

backlight currents. The single wire interface minimizes

microcontroller and interface pin counts. The four LEDs

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

independently controlled.

The SC658 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

SC658 provides a complete LED driver solution with a

minimal PCB footprint.

2.2µF

Backlight Driver for 4 LEDs

2.2µF

with SemPulse

OUT

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

Interface

SC658

single wire

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