ltc3209euf-2-trpbf Linear Technology Corporation, ltc3209euf-2-trpbf Datasheet

ltc3209euf-2-trpbf

Manufacturer Part Number

ltc3209euf-2-trpbf

Description

600ma Main/camera Led Controller

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC3209EUF-2-TRPBF.pdf (20 pages)

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FEATURES

■

TYPICAL APPLICATIO

APPLICATIO S

■

All other trademarks are the property of their respective owners.

*Protected by U.S. Patents, including 6411531

2.2µF

LOW HI

BAT

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

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 I

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

Video/Camera Phones with QVGA+ Displays

24.3k

SCL

SDA

CAMHL

C1P C1M

BAT1,2

2.2µF

REF

LTC3209-1

LTC3209-1 6 MAIN/1 CAM Operation

C2P C2M

2.2µF

MAIN1-6

GND

CAM

CPO

AUX

2.2µF

Interface

MAIN

CAM

3209 TA01

RED

DESCRIPTIO

The LTC

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 I

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 I

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

2.2µF

LOW HI

BAT

24.3k

C1P C1M

SCL

SDA

CAMHL

BAT1,2

2.2µF

600mA Main/Camera

REF

LTC3209-2

3209-1/LTC3209-2 are highly integrated

LTC3209-1/LTC3209-2

LTC3209-2 5 MAIN/2 CAM Operation

C2P C2M

2.2µF

MAIN1-5

GND

CAM

CPO

AUX

2.2µF

C serial interface. 256 states are

LED Controller

MAIN

C port. The parts

CAM

3209 TA02

320912fa

RED

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