LTC3611 Linear Technology, LTC3611 Datasheet

LTC3611

Manufacturer Part Number

LTC3611

Description

32V Monolithic Synchronous Step-Down DC/DC Converter

Manufacturer

Linear Technology

Datasheet

1.LTC3611.pdf (24 pages)

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Part Number:

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Manufacturer:

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Company:

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APPLICATIONS

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.

TYPICAL APPLICATION

FEATURES

10A Output Current

Wide V

Internal N-Channel MOSFETs

True Current Mode Control

Optimized for High Step-Down Ratios

Extremely Fast Transient Response

Stable with Ceramic C

±1% 0.6V Voltage Reference

Power Good Output Voltage Monitor

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

Adjustable Current Limit

Programmable Soft-Start

Output Overvoltage Protection

Optional Short-Circuit Shutdown Timer

Low Shutdown I

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

Point of Load Regulation

Distributed Power Systems

0N(MIN)

INTV

39.2k

680pF

0.1μF

High Efﬁciency Step-Down Converter

≤ 100ns

11k

Range = 4.5V to 32V (36V Maximum)

100pF

12.5k

OUT

RUN/SS

SGND

PGOOD

EXTV

RNG

: 15μA

LTC3611

BOOST

INTV

PGND

3611 TA01a

OUT

FCB

182k

0.22μF

4.7μF

1μH

30.1k

9.5k

10μF

×3

100μF

×2

4.5V TO 32V

2.5V

10A

OUT

DESCRIPTION

The LTC

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 V

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.

Synchronous Step-Down

3611 is a high efﬁciency, monolithic synchronous

100

10A, 32V Monolithic

Efﬁciency and Power Loss vs

0.01

DC/DC Converter

OUT

= 2.5V

POWER LOSS,

= 5V

Load Current

= 25V

LOAD CURRENT (A)

0.1

= 25V

POWER LOSS,

= 5V

3611 TA01b

LTC3611

and V

10000

1000

100

OUT

3611fb

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