SC668ULTRT【PDF 1/46 页】IC LED DRVR LMU 8CH MLPQUT20

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SC668

8 LED Light Management Unit

Automatic Dropout Prevention , Ambient Light

POWER MANAGEMENT

Features

Sense Input, PWM Dimming, and 4 LDOs

Description

Eight LED backlight sinks with 32 current settings

from — 0mA to 25mA

Up to four LED backlight banks

Lighting effects — fade-in/fade-out, breathe, blink,

auto-dim full, and auto-dim partial functions

ADP (Automatic Dropout Protection) for backlights

ALS (Ambient Light Sense) option sets the backlight

brightness according to ambient lighting conditions

I 2 C Bus fast mode and standard mode

Backlight current accuracy — ± 1.5% typical

Backlight current matching — ± 0.5% typical

Four programmable 200mA low-noise LDO regulators

The SC668 is a highly integrated light management unit

that provides programmable current for up to eight LED

current sinks. Four LED banks are provided to allow set-

tings for various LED zones or indicators. Four low-noise

LDOs with programmable outputs ranging from 1.2V to 3.3V

and 200mA maximum output current are also included.

ADP limits the maximum LED current to a level that ensures

the LEDs maintain matched currents when the supply

voltage approaches dropout. This feature produces accept-

able light output at low supply voltage levels without

requiring a boost converter or charge pump.

? PWM interface (200Hz to 50kHz) with internal digital

low-pass filter

? Automatic sleep mode with all 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

Two interfaces are provided for design flexibility. The I 2 C

interface controls the LED on/off functions, assigns the

LEDs to backlight banks, programs the LED currents, pro-

grams the lighting effects, enables the LDOs, and sets the

LDO output voltages. The PWM interface reduces the

current setting for LED bank #1 by a factor equal to the duty

cycle of the applied PWM signal. A filter at the PWM input

converts the pulsed signal to a DC current level, resulting in

Cellular phones, smart phones, and PDAs

LCD modules

Portable media players and digital cameras

Personal navigation devices

Display/keypad backlighting and LED indicators

less switching noise compared to pulsed current methods.

The ADI input translates the voltage from an external ALS

(Ambient Light Sensor) into a digitized code using a sigma-

delta ADC. This block includes level detection to adjust the

current setting of bank #1 with two different programmable

levels based on the ambient light level. An interrupt output

transitions low to notify the host processor that a level

Typical Application Circuit

adjustment has been made.

2.9 to 5.5V

V IN

SC668

BL1

V IN

I 2 C Data

I 2 C Clock

Backlight PWM

Device Enable

C IN

GND

SDA

SCL

PWM

BL2

BL3

BL4

BL5

BL6

BL7

BL8

V LDO4

ADI

BYP

LDO1

LDO2

LDO3

LDO4

LDO1

LDO2

LDO3

LDO4

C BYP

C 1

C 2

C 3

C 4

Ambient Light Sensor

December 2, 2010

? 2010 Semtech Corporation

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