LT3580

1

3580fg

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

Boost/Inverting DC/DC

Converter with 2A Switch,

Soft-Start, and Synchronization

internal 2A, 42V switch. The LT3580 can be configured

as either a boost, SEPIC or inverting converter. Capable

of generating 12V at 550mA or –12V at 350mA from a

5V input, the LT3580 is ideal for many local power supply

designs.

The LT3580 has an adjustable oscillator, set by a resistor

from the RT pin to ground. Additionally, the LT3580 can

be synchronized to an external clock. The free running or

synchronized switching frequency range of the part can

be set between 200kHz and 2.5MHz.

The LT3580 also features innovative SHDN pin circuitry

that allows for slowly varying input signals and an adjust-

able undervoltage lockout function.

Additional features such as frequency foldback and

soft-start are integrated. The LT3580 is available in tiny

3mm

× 3mm 8-lead DFN and 8-lead MSOP packages.

1.2MHz, 5V to 12V Boost Converter Achieves Over 88% Efficiency

Input Signals

× 3mm DFN and 8-Lead MSOP

Packages

Efficiency and Power Loss

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

Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

10μF

12V

550mA

4.2μH

130k

5V

SW

3580 TA01

LT3580

75k

10k

SHDN

GND

FB

VC

SYNC

SS

RT

1nF

0.1μF

2.2μF

LOAD CURRENT (mA)

0

50

55

65

70

75

400

95

3580 TA01b

60

200

100

500

300

600

80

85

90

0

200

600

1200

400

800

1000