LTC3209-2 PDF VIEW DOWNLOAD, LTC3209-2 データシート

LTC3209-2 データシートの表示（PDF） - Linear Technology

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LTC3209-2

600mA Main/Camera LED Controller

Linear Technology

LTC3209-2 Datasheet PDF : 20 Pages

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FEATURES

■ Multimode Charge Pump Provides Up to 94%

Efficiency (1x, 1.5x, 2x)

■ Up to 600mA Total Output Current

■ LTC3209-1: 8 Current Sources Available as

6 × 25mA MAIN, 1 × 400mA CAM and 1 × 15mA AUX

■ LTC3209-2: 8 Current Sources Available as

5 × 25mA MAIN, 2 × 200mA CAM and 1 × 15mA AUX

■ LED On/Off and Brightness Level Programmable

Using 2-Wire I2CTM Interface

■ Automatic Charge Pump Mode Switching or Fixed

Mode for Power Supply Generation

■ Low Noise Constant Frequency Operation*

■ Internal Soft-Start Limits Inrush Current During

Start-up and Mode Switching

■ Short Circuit/Thermal/Open-Shorted LED Protection

■ 256 Brightness States for MAIN Display

■ 16 Brightness States for CAM Display

■ 4 Brightness States for AUX Display

■ 20-Lead (4mm × 4mm) QFN Package

APPLICATIO S

■ Video/Camera Phones with QVGA+ Displays

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

*Protected by U.S. Patents, including 6411531

LTC3209-1/LTC3209-2

600mA Main/Camera

LED Controller

DESCRIPTIO

The LTC®3209-1/LTC3209-2 are highly integrated

multidisplay LED controllers. These parts contain a high

efficiency, low noise charge pump to provide power to

MAIN, CAM and AUX LED displays. The LTC3209-1/

LTC3209-2 require only four small ceramic capacitors

and one current set resistor to form a complete LED power

supply and current controller.

The maximum display currents are set by a single external

resistor. Current for each LED is controlled by a precision

internal current source. Dimming and On/Off for all dis-

plays is achieved via the I2C serial interface. 256 states are

available for the MAIN display. Sixteen states are available

for the CAM display and four states are available for the

AUX display.

The charge pump optimizes efficiency based on the

voltage across the LED current sources. The part powers

up in 1x mode and will automatically switch to boost mode

whenever any enabled MAIN or CAM LED current source

begins to enter dropout. The first dropout switches the

part into 1.5x mode and a subsequent dropout switches

the part into 2x mode. The part resets to 1x mode

whenever a data bit is updated via the I2C port. The parts

are available in a 4mm × 4mm 20-lead QFN package.

TYPICAL APPLICATIO

LTC3209-1 6 MAIN/1 CAM Operation

LTC3209-2 5 MAIN/2 CAM Operation

2.2µF 2.2µF

VBAT

2.2µF

C1P C1M C2P C2M 2.2µF

VBAT1,2

CPO

I2C

LOW HI

LTC3209-1

SCL

SDA

CAMHL

RREF

MAIN1-6

CAM

AUX

GND

24.3k

MAIN

CAM

RED

3209 TA01