ltc1629-6 Linear Technology Corporation, ltc1629-6 Datasheet

ltc1629-6

Manufacturer Part Number

ltc1629-6

Description

Polyphase, Synchronous Step-down Switching Regulator

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC1629-6.pdf (28 pages)

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FEATURES

APPLICATIO S

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

PolyPhase is a trademark of Linear Technology Corporation.

TYPICAL APPLICATIO

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

Reduces Required Input Capacitance and Power

Supply Induced Noise

True Remote Sensing Differential Amplifier

0.6V, 1% Voltage Reference Accuracy

PolyPhase Controller Operates from Two to Twelve

Phases

Current Mode Control Ensures Current Sharing

Phase-Lockable Fixed Frequency: 150kHz to 300kHz

1.8MHz Effective Switching Frequency Capability

OPTI-LOOP

Power Good Output Voltage Monitor

Wide V

Very Low Dropout Operation: 99% Duty Cycle

Adjustable Soft-Start Current Ramping

Internal Current Foldback Plus Shutdown Timer

Overvoltage Soft-Latch Eliminates Nuisance Trips

Micropower Shutdown

Available in 28-Lead SSOP Package

Desktop Computers

Internet Servers

Large Memory Arrays

DC Power Distribution Systems

Range: 4V to 36V Operation

Compensation Reduces C

1.5k

60.4k

3300pF

0.1 F

10k

D1, D2: UPS840

OUT

: T510E108K004AS

RUN/SS

PGOOD

CLKOUT

SGND

EAIN

DIFFOUT

–

LTC1629-6

Figure 1. High Current Dual Phase Step-Down Converter

SENSE1

SENSE2

BOOST1

BOOST2

INTV

PGND

SW1

SW2

TG1

BG1

TG2

BG2

OUT

–

L1, L2: CEPH149-IROMC-H

Step-Down Switching Regulator

10 F CER

X5R

0.47 F

DESCRIPTIO

The LTC

current mode switching regulator controller with 0.6V

reference 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 300kHz 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

multiplies the fundamental frequency by the number

of channels 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’s 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

LTC1629-6 includes a power good output pin that

indicates when the output voltage is inside the 10%

tolerance window.

M1, M3: Si7840DP

M2, M4: Si7440DP

PolyPhase, Synchronous

1629-6 is a PolyPhase

1 H

10 F 6

35V

CERAMIC

1 H

0.002

synchronous stepdown

270 F 4

OUT

5V TO 15V

0.7V/40A

1629 TA01

LTC1629-6

OUT

16296f

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