LTM4677 datasheet(1/128 Pages) LINER

Part #	LTM4677

Description	Dual Output PolyPhase Step-Down Controller with Sub-Milliohm DCR Sensing and Digital Power System Management

PDF	128 Pages

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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1 / 128 page

LTC3884/LTC3884-1

1

3884fe

For more information www.linear.com/LTC3884

TYPICAL APPLICATION

FEATURES

DESCRIPTION

Dual Output PolyPhase

Step-Down Controller with Sub-Milliohm DCR Sensing

and Digital Power System Management

The LTC®3884/LTC3884-1 are dual output PolyPhase DC/

DCsynchronousstep-downswitchingregulatorcontrollers

with an I2C-based PMBus compliant serial interface. The

controllers employ a constant-frequency current mode

architecture, together with a unique scheme to provide

excellent performance for sub-milliohm DCR applica-

tions. The LTC3884/LTC3884-1 are supported by the

LTpowerPlay® software development tool with graphical

user interface (GUI).

Programmable loop compensation allows the controller

to be compensated digitally. Switching frequency, channel

phasing, output voltage, and device address can be pro-

grammed both by the digital interface as well as external

configuration resistors. Additionally, parameters can be set

via the digital interface or stored in EEPROM. Both outputs

haveindependentpowergoodindicatorsandFAULTfunction.

The LTC3884 has integrated gate drivers. The LTC3884-1

has three-state PWM pins to drive power blocks or DrMOS

power stages.

APPLICATIONS

n

PMBus/I2CCompliantSerialInterface

–TelemetryRead-BackIncludesVIN,IIN,VOUT,IOUT,

TemperatureandFaults

–ProgrammableVoltage,CurrentLimit,DigitalSoft-

Start/Stop,Sequencing,Margining,OV/UV/OC

n

Sub-Milliohm DCR Current Sensing

n

Digitally Adjustable Loop Compensation Parameters

n

±0.5%OutputVoltageAccuracyOverTemperature

n

IntegratedInputCurrentSenseAmplifier

n

InternalEEPROMwithECCandFaultLogging

n

IntegratedN-ChannelMOSFETGateDrivers(LTC3884)

PowerConversion

n

WideVINRange:4.5Vto38V

n

VOUTRange:0.5Vto3.5V(withLowDCRSetting);

0.5Vto5.5V(withoutLowDCRSetting)

n

AccuratePolyPhase®CurrentSharingforUpto6Phases

n

Availablein48-Lead7mm×7mmQFNand

5mm×6mmGQFNPackages.

n

Telecom, Datacom, and Storage Systems

n

Industrial and Point-of-Load Applications

All registered trademarks and trademarks are the property of their respective owners. Protected

by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 5408150,

7420359, 8648623, 8786265, 8823352, 7000125. Licensed under U.S. Patent 7000125 and

other related patents worldwide.

Efficiency and Power Loss

vs Load Current

INTVCC

TG0

TG1

BOOST0

BOOST1

SW0

SW1

BG0

FAULT MANAGEMENT

TO/FROM

OTHER LTC DEVICES

SDA

SCL

ALERT

RUN0

RUN1

VSENSE0+

VSENSE0–

TSNS0

ITH0

ITHR0

VSENSE1+

VSENSE1–

TSNS1

ITH1

ITHR1

FAULT0

FAULT1

PGOOD0

PGOOD1

BG1

EXTVCC

SHARE_CLK

0.22µF

1µF

220pF

10nF

VOUT1

1V

30A

330µF

×2

330µF

×2

3884 TA01a

4700pF

VOUT0

1.8V

30A

2200pF

*SOME DETAILS OMITTED FOR CLARITY

0.22µF

931

ISENSE0+

ISENSE1+

ISENSE0–

ISENSE1–

PMBus

INTERFACE

4.7µF

10µF

×2

10µF

×2

2m

1µF

270µF

×2

1

VIN

6V TO 15V

0.1µF

DCR=0.32m

L=0.33µH

DCR=0.32m

VIN

LTC3884*

SGND

PGND

VDD33

VDD25

IIN+

IIN–

1µF

220pF

L= 0.33µH

VIN = 12V

VOUT = 1.8V

EXTVCC=0

fSW=350kHz

EFFICIENCY

POWER LOSS

LOAD CURRENT (A)

0

5

10

15

20

25

30

40

50

60

70

80

90

100

0

1

2

3

4

5

6

3884 TA01b

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