LT3663

1

3663fc

For more information For more information www.linear.com/LT3663

OUTPUT CURRENT (A)

0.1

100

90

80

70

60

50

40

0.5

0.9

0.3

0.7

1.1

3663 TA01b

1.3

Typical applicaTion

DescripTion

1.2A Step-Down

Switching Regulator with

Output Current Limit

TheLT®3663isacurrentmodestep-downswitchingregu-

lator with programmable output current limit. The current

limit accurately controls the system power dissipation and

reduces the size of the power path components.

Thewideoperatinginputvoltagerangeof7.5Vto36V(60V

transient) suits the LT3663 to a variety of input sources,

including unregulated 12V wall adapters, 24V industrial

supplies, and automotive power.

The LT3663 includes a low current shutdown mode, input

overvoltage and undervoltage lockout, and thermal shut-

down.Internalcompensationandboostdiodeminimizethe

number of external exponents. 3.3V and 5V fixed output

voltage versions are available.

TheLT3663isavailablein8-leadDFNandMSOPpackages

with exposed pads for low thermal resistance.

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

5V Step-Down Converter

FeaTures

applicaTions

n

Wide Input Range:

Operation from 7.5V to 36V

Overvoltage Lockout Protects Circuit through 60V

Transients

n

Programmable Output Current Limit (0.4A to 1.2A)

n

3.3V and 5V Fixed Output Voltage Options

n

Integrated Boost Diode

n

Fixed Frequency, Peak Current Mode Control

n

n

Internally Compensated

n

Thermal Protection

n

Thermally Enhanced 8-Pin 2mm

× 3mm DFN and

MSOP Packages

n

Distributed Supply Regulation

n

Automotive Battery Regulation

n

Industrial Supplies

n

Wall Transformer Regulation

Efficiency

3663 TA01

LT3663

RUN

BOOST

SW

GND

0.1µF

2.2µF

22µF

59k

28.7k

11k

6.8µH

FB

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