LTC3874-1

1

38741f

For more information www.linear/LTC3874-1

PWM0

PWM1

LTC3874-1

0.22µF

PHASMD

LDWDCR

ILIM

FREQ

GND

RUN0

SYNC

RUN1

FAULT0

FAULT1

RUN0

649

(0.29m DCR)

0.215µH

(0.29m DCR)

0.215µH

FAULT0

FAULT1

RUN1

SYNC

REFER TO LTC3884-1 DATA SHEET

FOR MASTER SETUP

1.8V

100µF

×3

100µF

×3

470µF

×2

470µF

×2

LTC3884-1

7V TO 14V

1.8V

120A

PGOOD0

PGOOD1

MODE0

MODE1

38741 TA01a

100k

DrMOS

DrMOS

+

0.22µF

4.7µF

+

649

CCM

EFFICIENCY

POWER LOSS

0.29mΩ

1.5mΩ

0.29mΩ

1.5mΩ

LOAD CURRENT (A)

0 10 20 30 40 50 60 70 80 90 100 110 120

70

75

80

85

90

95

100

2

5

8

11

14

17

20

38741 TA01b

Typical applicaTion

FeaTures

DescripTion

PolyPhase Step-Down

Synchronous Slave Controller with

Sub-Milliohm DCR Sensing

chronous step-down slave controller. It enables high cur-

rent,multiphaseapplicationswhenpairedwithacompanion

master controller by extending the phase count. Compat-

ible master controllers include the LTC3884-1, LTC3774,

LTC3875,LTC3877andLTC3866.TheLTC3874-1employs

a unique architecture that enhances the signal-to-noise

ratio of the current sense signal, allowing the use of sub-

milliohm DC resistance power inductors to maximize

efficiency while reducing switching jitter. Its peak current

mode architecture allows for accurate phase-to-phase

current sharing even for dynamic loads.

Effectivelyworkingwithamastercontroller,theLTC3874-1

supports all the programmable features as well as fault

protection.

L

, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and µModule are registered

trademarks of Analog Devices, Inc. All other trademarks are the property of their respective

owners. Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6144194, 6177787,

6580258, 5408150.

applicaTions

n

High Current Distributed Power Systems

n

Telecom, Datacom and Storage Systems

n

Intelligent Energy Efficient Power Regulation

High Efficiency, 4-Phase 1.8V/120A Step-Down Supply

n

Phase Extender for High Phase Count Voltage Rails

n

Operates with Power Blocks, DrMOS or External

Gate Drivers and MOSFETs

n

Accurate Phase-to-Phase Current Sharing

n

Sub-Milliohm DCR Current Sensing

n

Phase-Lockable Fixed Frequency 250kHz to 1MHz

n

Immediate Response to Master IC's Fault

n

Up to 12-Phase Operation

n

n

Up to 5.5V (LOWDCR Pin Low)

n

Proprietary Current Mode Control Loop

n

Programmable CCM/DCM Operation

n

Programmable Phase Shift Control

n

24-Lead (4mm × 4mm) QFN Package

4-Phase Efficiency and Power

Loss vs Output Current, Sub-

Milliohm DCR vs Traditional

DCR