LTC3603

1

3603fa

FEATURES

APPLICATIONS

DESCRIPTION

2.5A, 15V Monolithic

Synchronous Step-Down

Regulator

step-down DC/DC converter utilizing a constant-frequency,

current mode architecture. It operates from an input voltage

range of 4.5V to 15V and provides an adjustable regulated

output voltage from 0.6V to 14.5V while delivering up to

2.5A of output current. The internal synchronous power

switch with 45m

Ω on-resistance increases efficiency

and eliminates the need for an external Schottky diode.

The switching frequency can either be set by an external

compensation allows the transient response to be optimized

over a wide range of loads and output capacitors.

The LTC3603 can be configured for either Burst Mode op-

eration or forced continuous operation. Forced continuous

operation reduces noise and RF interference, while Burst

Mode operation provides the highest efficiency at light

loads. In Burst Mode operation, external control of the burst

clamp level allows the output voltage ripple to be adjusted

according to the requirements of the application.

3.3V, 2.5A, 1MHz Step-Down Regulator

TYPICAL APPLICATION

Low Output Voltage

and 4mm

× 4mm QFN Packages

Efficiency and Power Loss vs Load Current

105k

3603 TA01

22μF

100μF

0.22μF

2.2μH

1μF

1nF

RUN

RT

PGOOD

TRACK/SS

ITH

BOOST

SW

PGND

LTC3603

105k

475k

10pF

4.32k

3.3V

2.5A

4.5V TO 15V

LOAD CURRENT (A)

0.001

80

90

100

0.1

0.01

1

10

3603 TA01b

70

75

85

95

65

60

100

1000

10000

10

1

POWER LOSS

EFFICIENCY

L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered

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

are the property of their respective owners. Protected by U.S. Patents including 5481178,

6580258, 6498466, 6611131, 6177787, 5705919, 5847554.