LTC3774
RECOMMENDED FOR NEW DESIGNSDual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing
- Part Models
- 4
- 1ku List Price
- Starting From $4.48
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 2
Application Note 1
Technical Articles 1
Video 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3774EUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC3774EUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC3774IUHE#PBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) | ||
| LTC3774IUHE#TRPBF | 36-Lead QFN (5mm x 6mm x 0.75mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2977 | RECOMMENDED FOR NEW DESIGNS | 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement |
Tools & Simulations
LTspice 2
- LTC3774/LTC4449 Demo Circuit - High Efficiency Dual Output Buck Converter with Discrete MOSFET Drivers (7-14V to 1.5V & 1.2V @ 30A)
- LTC3774/LTC4449 Demo Circuit - High Efficiency 2-Phase Buck Converter with Discrete MOSFET Drivers (7-14V to 1.2V @ 60A)
Models for the following parts are available in LTspice:
- LTC3774
LTpowerCAD 2
- LTC3774/LTC4449 Project - High Output Current, 4-Phase Buck Controller for Sub-mΩ Inductor DCR Sensing (10-14V to 1.2V @ 120A)
- LTC3774/LTC4449 Project - Dual Buck Controller for Sub-mΩ Inductor DCR Sensing (7-14V to 1.5V & 1.2V @ 30A)
Design tools for the following parts are available in LTpowerCAD:
- LTC3774
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.
LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.
Evaluation Kits
LTC3774EUHE Demo Board | Dual Buck Controller, 7V ≤ VIN ≤ 14, VOUT1 = 1.2V @ 30A, VOUT2 = 1.5V @ 30A
Resources
LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 90A
Resources
LTC3774EUHE Demo Board | Synchronous Buck Controller, 4-Phase (LTC3774 ×2), 10V ≤ VIN ≤ 14V, VOUT = 1.2V @ 120A