LTC3601

1

3601f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

1.5A, 15V Monolithic

Synchronous Step-Down

Regulator

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

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

owners. Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589,

6774611.

Efficiency and Power Loss vs Load Current

Transient Response

Forced Continuous Operation

(3mm × 3mm) and MSOP Packages

The LTC

buck regulator using a phase-lockable controlled on-time,

current mode architecture capable of supplying up to 1.5A

of output current. The operating supply voltage range is

from 4V to 15V, making it suitable for a wide range of

power supply applications.

The operating frequency is programmable from 800kHz to

4MHz with an external resistor enabling the use of small

surface mount inductors. For switching noise sensitive

applications, the LTC3601 can be externally synchronized

over the same frequency range. An internal phase-locked

loop aligns the on-time of the top power MOSFET to the

internal or external clock. This unique constant frequency/

controlled on-time architecture is ideal for high step-down

ratio applications that demand high switching frequencies

and fast transient response.

The LTC3601 offers two operational modes: Burst Mode

operation and forced continuous mode to allow the user

to optimize output voltage ripple, noise, and light load

efficiency for a given application. Maximum light load

efficiency is achieved with the selection of Burst Mode

operationwhileforcedcontinuousmodeprovidesminimum

output ripple and constant frequency operation.

RUN

PGOOD

TRACK

LTC3601

PGND

SGND

BOOST

ITH

RT

MODE/SYNC

SW

FB

2.2μF

10pF

0.1μF

22μF

3.3V

1.5A

180k

40k

3601 TA01a

2.2μH

22μF

4V TO 15V

LOAD CURRENT (A)

30

90

100

20

10

80

50

70

60

40

0.001

0.1

1

10

3601 TA01b

0

1000

100

10

1

0.01