LTC4449
LTC4449
PRODUCTIONHigh Speed Synchronous N-Channel MOSFET Driver
- Part Models
- 4
- 1ku List Price
- Starting From $1.94
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Overview
- 4V to 6.5V VCC Operating Voltage
- 38V Maximum Input Supply Voltage
- Adaptive Shoot-Through Protection
- Rail-to-Rail Output Drivers
- 3.2A Peak Pull-Up Current
- 4.5A Peak Pull-Down Current
- 8ns TG Rise Time Driving 3000pF Load
- 7ns TG Fall Time Driving 3000pF Load
- Separate Supply to Match PWM Controller
- Drives Dual N-Channel MOSFETs
- Undervoltage Lockout
- Low Profile (0.75mm) 2mm × 3mm DFN Package
The LTC4449 is a high frequency gate driver that is designed to drive two N-Channel MOSFETs in a synchronous DC/DC converter. The powerful rail-to-rail driver capability reduces switching losses in MOSFETs with high gate capacitance.
The LTC4449 features a separate supply for the input logic to match the signal swing of the controller IC. If the input signal is not being driven, the LTC4449 activates a shutdown mode that turns off both external MOSFETs. The input logic signal is internally level-shifted to the bootstrapped supply, which functions at up to 42V above ground.
The LTC4449 contains undervoltage lockout circuits on both the driver and logic supplies that turn off the external MOSFETs when an undervoltage condition is present. An adaptive shoot-through protection feature is also built-in to prevent the power loss resulting from MOSFET cross-conduction current.
The LTC4449 is available in the 2mm × 3mm DFN package.
Applications
- Distributed Power Architectures
- High Density Power Modules
Documentation
Data Sheet 1
Technical Articles 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 |
|---|---|---|---|
| LTC4449EDCB#TRMPBF | 8-Lead DFN (2mm x 3mm w/ EP) | ||
| LTC4449EDCB#TRPBF | 8-Lead DFN (2mm x 3mm w/ EP) | ||
| LTC4449IDCB#TRMPBF | 8-Lead DFN (2mm x 3mm w/ EP) | ||
| LTC4449IDCB#TRPBF | 8-Lead DFN (2mm x 3mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LTC4364 | RECOMMENDED FOR NEW DESIGNS | Surge Stopper with Ideal Diode |
Tools & Simulations
LTspice 5
- LTC3774/LTC4449 Demo Circuit - High Efficiency 2-Phase Buck Converter with Discrete MOSFET Drivers (7-14V to 1.2V @ 60A)
- LTC3860/LTC4449 Demo Circuit - Dual, Multiphase Step-Down Voltage Mode Controller with Current Sharing (4-14V to 1.2V @ 25A & 1.8V @ 25A)
- LTC7851 - Step-Down (Buck) Regulators, LTC4449 - Power Monitor, Control, and Protection
- LTC3887 - Step-Down (Buck) Regulators, LTC4449 - Power Monitor, Control, and Protection
- LTC3860 - Step-Down (Buck) Regulators, LTC4449 - Power Monitor, Control, and Protection
Models for the following parts are available in LTspice:
- LTC4449
LTpowerCAD 4
- LTC7851-1/LTC4449 Project - Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller (7-14V to 1.8V, 1.5V, 1.2V & 1V @ 30A)
- LTC7851/LTC4449 Project - Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller (7-14V to 1.8V, 1.2V & 1V @ 30A)
- 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)
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.