LT3489 Ver la hoja de datos (PDF) - Linear Technology

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LT3489

2MHz Boost DC/DC Converter with 2.5A Switch and Soft-Start

Linear Technology 

FEATURES

■ 2.5A, 0.12Ω, 40V Internal Switch

■ 2MHz Switching Frequency

■ Integrated Soft-Start Function

■ VIN Range: 2.6V to 16V

■ Adjustable Output from VIN to 40V

■ Low VCESAT Switch: 110mV at 1A (Typical)

■ 8V at 610mA from a 3.3V Input

■ Internal or External Loop Compensation

■ Small 8-Lead MS8E

U

APPLICATIO S

■ TFT-LCD Bias Supplies

■ GPS Receivers

■ DSL Modems

■ Local Power Supply

LT3489

2MHz Boost DC/DC

Converter with 2.5A Switch

and Soft-Start

DESCRIPTIO

The LT®3489 is a fixed frequency step-up DC/DC converter

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.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

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

VON

23V

10mA

0.1µF

0.1µF

0.1µF

VIN

3.3V

OFF ON

+

4.7µF

100nF

2.2µH

VIN

SW

SHDN

SS LT3489

COMP

FB

VC

GND

37.4k

220pF

28.7k

5.23k

AVDD

8V

610mA

20µF

2µF

0.1µF

2µF

VOFF

–8V

3489 TA01 20mA

Efficiency

90

85

80

75

70

65

60

55 VON LOAD = 10mA

50 VOFF LOAD = 20mA

0 100 200 300 400 500 600 700

AVDD LOAD CURRENT (mA)

3489 TA01b

3489f

1

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