LTC3773 查看數據表（PDF） - Linear Technology

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LTC3773

Triple Output Synchronous 3-Phase DC/DC Controller with Up/Down Tracking

Linear Technology 

FEATURES

■ Current Mode Controller with Onboard

MOSFET Drivers

■ Programmable Power Up/Down Tracking

■ Wide VIN Range: 3.3V to 36V (VCC = 5V)

■ ±1% 0.6V VFB Accuracy Over Temperature

■ Power Good Output Voltage Monitor

■ Phase-Lockable or Adjustable Frequency:

160kHz to 700kHz

■ OPTI-LOOP® Compensation Minimizes COUT

■ Current Foldback and Overvoltage Protection

■ Selectable Continuous, Discontinuous or

Burst Mode® Operation at Light Load

■ Programmable Phase Operation

■ Available in 5mm x 7mm QFN and 36-Lead

SSOP Packages

APPLICATIONS

■ Servers, Telecom, Industrial Power Supplies

■ General Purpose Multiple Rail DC/DC

■ FPGA and DSP Requirements

LTC3773

Triple Output Synchronous

3-Phase DC/DC Controller with

Up/Down Tracking

DESCRIPTION

The LTC®3773 is a high performance, 3-phase, triple output

synchronous step-down switching regulator controller

with output voltage power up/down tracking capability.

The controller allows for sequential, coincident or ratio-

metric tracking.

This 3-phase controller drives its output stages with 120°

phase separation at frequencies of up to 700kHz per phase

minimizing the RMS input current. Light load efficiency can

be maximized by using selectable Burst Mode operation.

The 0.6V precision reference supports output voltages

from 0.6V to 5V.

Fault protection features include output overvoltage, input

undervoltage lockout plus current foldback under short-

circuit or overload conditions.

, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of

Linear Technology Corporation. All other trademarks are the property of their respective

owners. Protected by U.S. Patents including 5408150, 5481178, 5705919, 5929620,

6144194, 6177787, 6304066, 6498466, 6580258, 6611131.

TYPICAL APPLICATION

High Efficiency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller

10k

PGOOD

0.1μF

SW1, 2, 3

PGOOD VCC

POWER UP/SHUTDOWN SDB1, 2, 3

TRACK1, 2, 3

0.01μF

VOUT1

2.5V/15A 0.003Ω

VIN

2.2μH

COUT1

TG1

SW1

BG1

BOOST1, 2, 3 VDR

TG2

SW2

BG2

LTC3773

SENSE2+

SENSE2–

VFB2

TG3

SW3

BG3

31.6k

10k

SENSE1+

SENSE1–

VFB1

ITH1, 2, 3

PLLFLTR

SGND

PGND

SENSE3+

SENSE3–

VFB3

3773 F01

VCC

4.5V TO 6V

10μF

1.5μH

VOUT2

0.003Ω 1.8V/15A

+

COUT2

VIN

4.5V TO 22V

CIN

20k

VIN

1.2μH

VOUT3

0.003Ω 1.2V/15A

10k

COUT3

20k

20k

3773fb

1

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