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FEATURES

s

LTC3729

550kHz, PolyPhase,

High Efficiency, Synchronous

Step-Down Switching Regulator

DESCRIPTIO

The LTC

廬

3729 is a multiple phase, synchronous step-

down current mode switching regulator controller that

drives N-channel external power MOSFET stages in a

phase-lockable fixed frequency architecture. The PolyPhase

controller drives its two output stages out of phase at

frequencies up to 550kHz to minimize the RMS ripple

currents in both input and output capacitors. The output

clock signal allows expansion for up to 12 evenly phased

controllers for systems requiring 15A to 200A of output

current. The multiple phase technique effectively multi-

plies the fundamental frequency by the number of chan-

nels used, improving transient response while operating

each channel at an optimum frequency for efficiency.

Thermal design is also simplified.

An internal differential amplifier provides true remote

sensing of the regulated supply鈥檚 positive and negative

output terminals as required for high current applications.

A RUN/SS pin provides both soft-start and optional timed,

short-circuit shutdown. Current foldback limits MOSFET

dissipation during short-circuit conditions when the

overcurrent latchoff is disabled. OPTI-LOOP compensa-

tion allows the transient response to be optimized over a

wide range of output capacitance and ESR values. The

LTC3729 includes a power good output pin that indicates

when the output is within

鹵7.5%

of the designed set point.

s

Wide V

IN

Range: 4V to 36V Operation

Reduces Required Input Capacitance and Power

Supply Induced Noise

鹵

1% Output Voltage Accuracy

Phase-Lockable Fixed Frequency: 250kHz to 550kHz

True Remote Sensing Differential Amplifier

PolyPhase

TM

Extends from Two to Twelve Phases

Reduces the Size and Value of Inductors

Current Mode Control Ensures Current Sharing

1.1MHz Effective Switching Frequency (2-Phase)

OPTI-LOOP

廬

Compensation Reduces C

OUT

Power Good Output Voltage Indicator

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Soft-Start Current Ramping

Internal Current Foldback Plus Shutdown Timer

Overvoltage Soft-Latch Eliminates Nuisance Trips

Available in 5mm

脳

5mm QFN

and 28-Lead SSOP Packages

APPLICATIO S

s

Desktop Computers/Servers

Large Memory Arrays

DC Power Distribution Systems

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

OPTI-LOOP is a registered trademark of Linear Technology Corporation.

PolyPhase is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

0.1碌F

S

V

IN

LTC3729

10鈩?/div>

TG1

SW1

S

M1

0.47碌F

S

0.1碌F

RUN/SS

PGOOD

I

TH

3.3k

S

BOOST1

BG1

PGND

SENSE1

+

SENSE1

鈥?/div>

TG2

SGND

BOOST2

SW2

V

DIFFOUT

BG2

EAIN

V

OS 鈥?/div>

V

OS

+

S

0.002鈩?/div>

M2

脳2

L1

D1 0.8碌H

1000pF

M3

S

0.47碌F

S

0.002鈩?/div>

M4

脳2

L2

0.8碌H

16k

S

D2

+

INTV

CC

SENSE2

+

SENSE2

鈥?/div>

S

10碌F

16k

C

OUT

: T510E108K004AS

D1, D2: UP5840

L1, L2: CEPH149-IROMC

M1, M3: IRF7811W

M2, M4: IRF7822

Figure 1. High Current Dual Phase Step-Down Converter

U

10碌F

35V

CERAMIC

脳4

V

IN

5V TO 28V

V

OUT

1.6V/40A

+

C

OUT

1000碌F

脳2

4V

3729 TA01

sn3729 3729fas

1

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LTC3729 Datasheet

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