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LTC3774

Dual, Multiphase Current Mode Synchronous Controller

Linear Technology 

LTC3774

Dual, Multiphase Current

Mode Synchronous Controller

for Sub-Milliohm DCR Sensing

FEATURES

DESCRIPTION

n Sub-Milliohm DCR Current Sensing

n Operates with Power Blocks, DRMOS or External

Gate Drivers and MOSFETs

n Supports Phase Shedding and N+1 Phase

Redundancy

n Programmable DCR Temperature Compensation

n ±0.75% Maximum Total DC Output Error Over

Temperature

n Dual Differential Remote Output Voltage Sense

Amplifiers

n Phase-Lockable Fixed Frequency Range: 200kHz to

1.2MHz

n VIN Range: 4.5V to 38V

n VOUT Range: 0.6V to 3.5V

n Supports Smooth Start-Up into Pre-Biased Outputs

n Programmable Soft-Start or VOUT Tracking

n Hiccup Mode/Soft Recovery from Output Overcurrent

n 36-Lead (5mm × 6mm) QFN Package

APPLICATIONS

n Computer Systems

n Telecom and Datacom Systems

n Industrial Equipment

n DC Power Distribution Systems

The LTC®3774 is a dual PolyPhase® current mode syn-

chronous step-down switching regulator controller that

drives power blocks, DRMOS or external gate drivers and

power MOSFETs. It offers an LTC-proprietary technique

that enhances the signal-to-noise ratio of the current

sense signal, allowing the use of inductors with very low

DC winding resistances as the current sense element for

maximum efficiency and reduced jitter.

The maximum current sense voltage is programmable

from 10mV to 30mV. High speed, low offset remote sense

differential amplifiers and a precise 0.6V reference provide

accurate output voltages between 0.6V and 3.5V from a wide

4.5V to 38V input supply range. Soft recovery from output

shorts or overcurrent minimizes output overshoot. Burst

Mode® operation, continuous and pulse-skipping modes

are supported. The constant operating frequency can be

synchronized to an external clock or linearly programmed

from 200kHz to 1.2MHz. Up to six LTC3774 controllers can

be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.

The LTC3774 is available in a 36-lead (5mm × 6mm) QFN

package.

L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered

trademarks and No RSENSE and Hot Swap are trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Protected by U.S. Patents,

including 5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending.

TYPICAL APPLICATION

High Efficiency Dual Phase 1.5V/60A Step-Down Converter

0.33µH

(0.32mΩ DCR)

1/4 INTVCC

DRMOS

+

300µF

4V

15k

10k

2200pF

15k

RUN1, 2

ILIM1, 2

HIZB1

HIZB2

PWM1

PWMEN1

VOSNS1–

SNSA1+

SNS1–

SNSD1+

VOSNS1+

ITH1

TK/SS1

VIN

LTC3774

TK/SS2

PHSMD

CLKOUT

PGOOD1,2

MODE/PLLIN

PWM2

PWMEN2

GND

VOSNS2–

SNSA2+

SNS2–

SNSD2+

FREQ

VOSNS2+

ITH2

INTVCC

0.1µF

4.7µF

fIN

500kHz

37.5k

DRMOS

VIN

4.5V TO 20V

22µF

50V

0.33µH

(0.32mΩ DCR)

330µF +

4V

VOUT

1.5V

60A

3774 TA01a

For more information www.linear.com/LTC3774

3774f

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