1

LT3503

3503f

APPLICATIO S

FEATURES

TYPICAL APPLICATIO

DESCRIPTIO

1A, 2.2MHz Step-Down

Switching Regulator in

2mm

× 3mm DFN

The LT

converter with an internal 1.45A power switch. The wide

operating input range of 3.6V to 20V makes the LT3503

ideal for regulating power from a wide variety of sources.

Its high operating frequency allows the use of tiny, low

cost inductors 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: 3.6V to 20V

■

3.3V at 1.2A from 8.5V to 12V Input

■

Output Adjustable Down to 780mV

■

Soft-Start

µA

■

× 3mm 6-Pin DFN

Low Profile Package

■

Industrial Control Supplies

■

Battery-Powered Equipment

3.3V Step-Down Converter

Efficiency

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

All other trademarks are the property of their respective owners.

4.5V TO 12V

20V MAX

ON OFF

0.1

µF

2.5

µH

37.4k

10

µF

3503 TA01a

120pF

1

µF

11.5k

3.3V

BOOST

GND

FB

SHDN

SW

LT3503

LOAD CURRENT (A)

0

85

80

75

70

65

60

55

50

0.6

1.0

3503 TA01b

0.2

0.4

0.8

1.2