lt3497eddb-trpbf Linear Technology Corporation, lt3497eddb-trpbf Datasheet

lt3497eddb-trpbf

Manufacturer Part Number

lt3497eddb-trpbf

Description

Dual Full Function White Led Driver With Integrated Schottky Diodes

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3497EDDB-TRPBF.pdf (20 pages)

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FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

Drives Up to 12 White LEDs (6 in Series per

Converter) from a 3V Supply

Two Independent Boost Converters Capable of

Driving Asymmetric LED Strings

Independent Dimming and Shutdown Control of the

Two LED Strings

High Side Sense Allows “One Wire Current Source”

per Converter

Internal Schottky Diodes

Open LED Protection (32V)

2.3MHz Switching Frequency

±5% Reference Accuracy

Dual Wide 250:1 True Color PWM

Requires Only 1µF Output Capacitor per Converter

Available in a 3mm × 2mm 10-Pin DFN Package

Cellular Phones

PDAs, Handheld Computers

Digital Cameras

MP3 Players

GPS Receivers

1µF

Range: 2.5V to 10V

Li-Ion Power Driver for 4/4 White LEDs

10Ω

AND DIMMING

OFF ON

SHUTDOWN

CONTROL 1

15µH

CAP1

LED1

CTRL1

SW1 V

LT3497

3V TO 5V

GND

CTRL2

SW2

CAP2

LED2

AND DIMMING

SHUTDOWN

CONTROL 2

15µH

OFF ON

10Ω

1µF

Dimming

3497 TA01a

1µF

DESCRIPTION

The LT

verter speciﬁ cally designed to drive up to 12 white LEDs

(6 white LEDs in series per converter) from a Li-Ion cell. Se-

ries connection of the LEDs provides identical LED currents

resulting in uniform brightness and eliminating the need

for ballast resistors and expensive factory calibration.

The two independent converters are capable of driving

asymmetric LED strings. Accurate LED dimming and

shutdown of the two LED strings can also be controlled

independently. The LT3497 features a unique high side LED

current sense that enables the part to function as a “one

wire current source;” one side of the LED string can be

returned to ground anywhere, allowing a simpler 1-wire

LED connection. Traditional LED drivers use a grounded

resistor to sense LED current, requiring a 2-wire connec-

tion to the LED string.

The 2.3MHz switching frequency allows the use of tiny

inductors and capacitors. Few external components are

needed for the dual white LED Driver: open-LED protection

and the Schottky diodes are all contained inside the 3mm

× 2mm DFN package. With such a high level of integra-

tion, the LT3497 provides a high efﬁ ciency dual white LED

driver solution in the smallest of spaces.

True Color PWM is a trademark of Linear Technology Corporation.

All other trademarks are the property of their respective owners.

LED Driver with Integrated

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

Dual Full Function White

3497 is a dual full function step-up DC/DC con-

4/4LEDs

= 3.6V

Schottky Diodes

LED CURRENT (mA)

Efﬁ ciency

3497 TA01b

LT3497

3497f

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