LTC3773

PRODUCTION

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

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Overview

  • Current Mode Controller with On-board 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 × 7mm QFN and 36-Lead
  • SSOP Packages

The LTC3773 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 ratiometric 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.

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
High Efficiency, 3-Phase, Triple Synchronous DC/DC Step-Down Controller Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3773
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC913A

LTC3773EUHF Demo Board | (QFN) 3-Phase, 4.5V ≤ VIN ≤ 13.5V, VOUT1 = 2.5V @ 15A, VOUT2 = 1.8V @ 15A, VOUT3 = 1.2V @ 15A

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Product Details

Demonstration circuit 913 is a high efficiency and high density supply featuring the 3-output, 3-phase synchronous buck regulator LTC3773 in the 5x7 QFN-38 package. The input voltage range of the demo board is designed for 4.5V to 13.5V, though the LTC3773 controller can take up to 36VMAX VIN. The outputs of this board are 2.5V @ 15A, 1.8V @ 15A and 1.2V @ 15A.

eval board
schematic 2
DC908A

LTC3773EG Demo Board | (SSOP) 3-Phase, 7V ≤ VIN ≤ 24V, VOUT1 = 3.3V @ 15A, VOUT2 = 2.5V @ 15A, VOUT3 = 1.8V @ 15A

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Product Details

Demonstration circuit 908 is a high efficiency and high density supply featuring the 3-output, 3-phase synchronous buck regulator LTC3773 in the SSOP-36 package. The input voltage range of the demo board is designed for 7V to 24V, though the LTC3773 controller can take up to 36VMAX VIN. The outputs of this board are 3.3V @ 15A, 2.5V @ 15A and 1.8V @ 15A.
DC913A
LTC3773EUHF Demo Board | (QFN) 3-Phase, 4.5V ≤ VIN ≤ 13.5V, VOUT1 = 2.5V @ 15A, VOUT2 = 1.8V @ 15A, VOUT3 = 1.2V @ 15A
DC913A - Schematic
DC908A
LTC3773EG Demo Board | (SSOP) 3-Phase, 7V ≤ VIN ≤ 24V, VOUT1 = 3.3V @ 15A, VOUT2 = 2.5V @ 15A, VOUT3 = 1.8V @ 15A
DC908A - Schematic

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