LT3489

1

3489f

0

65

70

75

300

500

3489 TA01b

60

55

50

100

200

400

80

85

90

700

600

2MHz Boost DC/DC

Converter with 2.5A Switch

and Soft-Start

The LT

containing an internal 2.5A, 40V switch. The LT3489 is

ideal for large TFT-LCD panel power supplies. The LT3489

switches at 2MHz, allowing the use of tiny, low profile

inductors and low value ceramic capacitors. Loop com-

pensation can be either internal or external, giving the

user flexibility in setting loop compensation and allow-

ing optimized transient response with low ESR ceramic

output capacitors. Soft-start is controlled with an external

capacitor, which determines the input current ramp rate

during start-up.

The 8-lead MS8E package and high switching frequency en-

sure a low profile overall solution less than 1.1mm high.

■

TFT-LCD Bias Supplies

■

GPS Receivers

■

DSL Modems

■

Local Power Supply

■

2.5A, 0.12Ω, 40V Internal Switch

■

2MHz Switching Frequency

■

Integrated Soft-Start Function

■

■

■

■

8V at 610mA from a 3.3V Input

■

Internal or External Loop Compensation

■

Small 8-Lead MS8E

Low Profile, Triple Output TFT Supply (8V, –8V, 23V)

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

3.3V

SW

FB

LT3489

2.2

µH

5.23k

37.4k

28.7k

3489 TA01

20

µF

220pF

0.1

µF

0.1

µF

0.1

µF

2

µF

2

µF

4.7

µF

100nF

–8V

20mA

8V

610mA

23V

10mA

0.1

µF

GND

SHDN

SS

COMP

+

OFF ON

Efficiency