LTC3774
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3774

Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $3.54
Features
  • Sub-Milliohm DCR Current Sensing
  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Supports Phase Shedding and N+1 Phase Redundancy
  • Programmable DCR Temperature Compensation
  • ±0.75% Maximum Total DC Output Error Over Temperature
  • Dual Differential Remote Output Voltage Sense Amplifiers
  • Phase-Lockable Fixed Frequency Range: 200kHz to 1.2MHz
  • VIN Range: 4.5V to 38V
  • VOUT Range: 0.6V to 3.5V
  • Supports Smooth Start-Up into Pre-Biased Outputs
  • Programmable Soft-Start or VOUT Tracking
  • Hiccup Mode/Soft Recovery from Output Overcurrent
  • 36-Lead (5mm × 6mm) QFN Package
Additional Details
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The LTC3774 is a dual PolyPhase® current mode synchronous 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.

Applications

  • Computer Systems
  • Telecom and Datacom Systems
  • Industrial Equipment
  • DC Power Distribution Systems
Part Models 4
1ku List Price Starting From $3.54

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3774EUHE#PBF
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LTC3774EUHE#TRPBF
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LTC3774IUHE#PBF
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LTC3774IUHE#TRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 3

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DC2002A

LTC3774EUHE Demo Board | Dual Buck Controller, 7V ≤ VIN ≤ 14, VOUT1 = 1.2V @ 30A, VOUT2 = 1.5V @ 30A

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DC2002A

LTC3774EUHE Demo Board | Dual Buck Controller, 7V ≤ VIN ≤ 14, VOUT1 = 1.2V @ 30A, VOUT2 = 1.5V @ 30A

LTC3774EUHE Demo Board | Dual Buck Controller, 7V ≤ VIN ≤ 14, VOUT1 = 1.2V @ 30A, VOUT2 = 1.5V @ 30A

Product Detail

Demonstration circuit DC2002A is a dual output synchronous buck converter featuring the LTC3774EUHE. The demo board supplies two rails of 1.5V / 30A and 1.2V / 30A. The power stage for each rail consists of a 0.33μH 0.32mΩ DCR inductor with a 11mm × 11mm footprint and a 6mm × 6mm DrMOS driven by the PWM outputs of the LTC3774EUHE at a switching frequency of 400kHz.



reference details image

DC2111A-A

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 90A

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DC2111A-A

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 90A

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 90A

Product Detail

Demonstration circuit DC2111A-A features the LTC3774 in a 4-phase, high output current step-down converter with sub-mΩ DCR sensing. This high performance converter provides 1.2V @ 90A with N+1 MOSFET failure protection and operates at a switching frequency of 400kHz over an input voltage range of 10V to 14V. The 5mm × 5mm DrMOS and 0.33μH/0.325mΩ inductor provide high efficiency while supplying 30A per phase.

reference details image

DC2111A-B

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 120A

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DC2111A-B

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 120A

LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 120A

Product Detail

Demonstration circuit DC2111A-B features the LTC3774 in a 4-phase, high output current step-down converter with sub-mΩ DCR sensing. This high performance, high efficiency converter provides 1.2V @ 120A and operates at a switching frequency of 400kHz over an input voltage range of 10V to 14V. The 5mm × 5mm DrMOS and 0.33μH/0.325mΩ inductor provide high efficiency while supplying 30A per phase.

Tools & Simulations

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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