1

LT3493-3

3493-3f

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

1.2A, 750kHz Step-Down

Switching Regulator in

2mm

× 3mm DFN

The LT

converter with an internal 1.75A power switch. The wide

operating input range of 6.8V to 36V (40V maximum) makes

the LT3493-3 ideal for regulating power from a wide vari-

ety of sources, including unregulated wall transformers,

24V industrial supplies and automotive batteries. Its high

operating frequency allows the use of tiny, low cost induc-

tors and ceramic capacitors, resulting in low, predictable

output ripple.

Cycle-by-cycle current limit provides protection against

shorted outputs and soft-start eliminates input current

surge during start-up. The low current (<2

µA) shutdown

mode provides output disconnect, enabling easy power

management in battery-powered systems.

■

Wide Input Range: 6.8V to 36V Operating,

40V Maximum

■

Fixed Frequency Operation: 750kHz

■

Uses Tiny Capacitors and Inductors

■

Low Shutdown Current: <2

µA

× 3mm

DFN-6 Package

■

Wall Transformer Regulation

3.3V Step-Down Converter

Efficiency

6.8V TO 36V

ON OFF

0.1

µF

10

µH

32.4k

10

µF

3493-3 TA01a

22pF

1

µF

10k

3.3V

BOOST

GND

FB

SHDN

SW

LT3493-3

, LT, LTC and LTM 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.

LOAD CURRENT (A)

70

80

3493-3 TA01b

60

50

0.4

0.8

1.2

0.2

0

0.6

1.0

90

65

75

55

85

L = 10

µH