SC643 datasheet(1/26 Pages) SEMTECH

部件名	SC643

功能描述	Light Management Unit with 4 LDOs and SemPulse짰Interface

PDF	26 Pages

Scroll/Zoom	100%

制造商	SEMTECH [Semtech Corporation]

网页	http://www.semtech.com

标志

1 / 26 page

POWER MANAGEMENT

1

SC643

Light Management Unit with

4 LDOs and SemPulse

® Interface

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

Five programmable current sinks with 29 increments

from 0mA to 25mA

Four programmable 200mA low-noise LDO regulators

Programmable driver configurations for main and

sub-display backlight

Fade-in/fade-out feature for main and sub display

backlight

SemPulse single wire interface

Backlight current accuracy — ±1.5% typical

Backlight current matching — ±0.5% typical

External enable pin for optional control of LDO4

Automatic sleep mode with LEDs off

Shutdown current — 0.1μA typical

Ultra-thin package — 3 x 3 x 0.6 (mm)

Lead free and Halogen free

WEEE and RoHS compliant

Applications

Cellular phones, smart phones, and PDAs

LCD display modules

Portable media players

Digital cameras and GPS units

Display backlighting and LED indicators

Description

The SC643 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.

Display backlighting is provided through five matched

current sinks with integrated fade-in and fade-out con-

trols. The LEDs can be driven as a single set or as two

different sets (for main and sub displays) with indepen-

dent controls. Four low noise, low dropout (LDO) regulators

are provided to supply power for camera module I/O and

other peripheral circuits. An external enable pin is also

provided for one LDO for added flexibility.

The SC643 uses the proprietary SemPulse

® single wire

interface. This interface controls all functions of the device,

including backlight currents and LDO voltage outputs.

The single wire interface minimizes microcontroller and

interface pin counts.

The SC643 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 inter-

face. Any combination of LDOs may be enabled when in

sleep mode.

4.7μF

SemPulse

Interface

Motor

Control

Main Backlight

4.7μF

VBAT = 2.9V to 5.5V

1.0μF

22nF

2.2μF

VLDO1 = 1.5V to 3.3V

VLDO2 = 1.2V to 1.8V

BL5

BL4

BL3

BL2

BL1

LDO1

LDO2

PGND

AGND

BYP

ENL4

SPIF

IN

OUT

LDO3

LDO4

1.0μF1.0μF

VLDO3 = 1.5V to 3.3V

Motor

SC643

Sub

Backlight

Typical Application Circuit

October 8, 2009

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

类似零件编号 - SC643

制造商	部件名	数据表	功能描述
Nippon Precision Circui...	SC6433	1Mb / 4P	BWTV CAMERA SYNC PULSE GENERATOR

More results

类似说明 - SC643

制造商	部件名	数据表	功能描述
Semtech Corporation	SC621	307Kb / 23P	LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interface
	SC624	288Kb / 22P	LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and SemWireTM Interface
	SC624A	295Kb / 23P	LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface
	SC627	362Kb / 23P	LED Light Management Unit Charge Pump, 4 LEDs, 700mA Flash LED, Dual LDOs, and SemWireTM Interface
	SC624	295Kb / 22P	LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and SemWireTM Interface
	SC624A	302Kb / 23P	LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs,and I2C Interface
	SC644	609Kb / 26P	Light Management Unit with 4 LDOs and SemPulse짰Interface
	SC653	309Kb / 22P	Light Management Unit with 2 LDOs and SemPulse짰Interface
	SC667	1Mb / 47P	7 LED Light Management Unit Automatic Dropout Prevention, Ambient Light Sense Input, PWM Dimming, and 4 LDOs
	SC668	875Kb / 46P	8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs