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LTC3611EWP-PBF

10A, 32V Monolithic Synchronous Step-Down DC/DC Converter

Linear Technology 

FEATURES

n 10A Output Current

n Wide VIN Range = 4.5V to 32V (36V Maximum)

n Internal N-Channel MOSFETs

n True Current Mode Control

n Optimized for High Step-Down Ratios

n t0N(MIN) ≤ 100ns

n Extremely Fast Transient Response

n Stable with Ceramic COUT

n ±1% 0.6V Voltage Reference

n Power Good Output Voltage Monitor

n Adjustable On-Time/Switching Frequency (>1MHz)

n Adjustable Current Limit

n Programmable Soft-Start

n Output Overvoltage Protection

n Optional Short-Circuit Shutdown Timer

n Low Shutdown IQ: 15μA

n Available in a 9mm × 9mm 64-Pin QFN Package

APPLICATIONS

n Point of Load Regulation

n Distributed Power Systems

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

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

5481178, 6100678, 6580258, 5847554, 6304066.

LTC3611

10A, 32V Monolithic

Synchronous Step-Down

DC/DC Converter

DESCRIPTION

The LTC®3611 is a high efficiency, monolithic synchronous

step-down DC/DC converter that can deliver up to 10A

output current from a 4.5V to 32V (36V maximum) input

supply. It uses a constant on-time valley current mode

control architecture to deliver very low duty cycle opera-

tion at high frequency with excellent transient response.

The operating frequency is selected by an external resistor

and is compensated for variations in VIN and VOUT.

The LTC3611 can be configured for discontinuous or

forced continuous operation at light load. Forced continu-

ous operation reduces noise and RF interference while

discontinuous mode provides high efficiency by reducing

switching losses at light loads.

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and an optional

short-circuit shutdown timer. Soft-start capability for sup-

ply sequencing is accomplished using an external timing

capacitor. The regulator current limit is user programmable.

A power good output voltage monitor indicates when

the output is in regulation. The LTC3611 is available in a

compact 9mm × 9mm QFN package.

TYPICAL APPLICATION

High Efficiency Step-Down Converter

0.1μF VOUT

100pF

680pF

12.5k

INTVCC

39.2k

11k

VON

ION

RUN/SS VIN

LTC3611

SW

ITH

BOOST

SGND INTVCC

FCB

VRNG

PGOOD PGND

EXTVCC VFB

3611 TA01a

182k

1μH

0.22μF

10μF

×3

VIN

4.5V TO 32V

100μF

×2

VOUT

2.5V

10A

4.7μF

30.1k

9.5k

Efficiency and Power Loss vs

Load Current

100

VOUT = 2.5V

90

80

VIN = 5V

70

VIN = 25V

10000

1000

60

50

100

POWER LOSS,

40

VIN = 5V

30

10

20

POWER LOSS,

10

VIN = 25V

0

1

0.01

0.1

1

10

LOAD CURRENT (A)

3611 TA01b

3611fb

1

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