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LTC4449IDCB
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Product Detailed Parameters
- Description：IC GATE DRVR HALF-BRIDGE 8DFN
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Driven Configuration：Half-Bridge
- Channel Type：Synchronous
- Number of Drivers：2
- Gate Type：MOSFET (N-Channel)
- Voltage - Supply：4V ~ 6.5V
- Logic Voltage - VIL, VIH：3V, 6.5V
- Current - Peak Output (Source, Sink)：3.2A, 4.5A
- Input Type：Non-Inverting
- Rise / Fall Time (Typ)：8ns, 7ns
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：8-WFDFN Exposed Pad
- Supplier Device Package：8-DFN (2x3)
- Grade：-
- Qualification：-
- High Side Voltage - Max (Bootstrap)：42 V
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Overview
The LTC4449IDCB is a high-speed synchronous N-channel MOSFET gate driver designed for driving two N-channel MOSFETs in synchronous DC/DC converters. It features rail-to-rail drive capability to reduce switching losses in MOSFETs with high gate capacitance. The device includes an independent power supply for input logic to match controller IC signal swings. Input signals are internally level-shifted to the bootstrap supply, allowing operation at ground voltages up to 42V. If input signals are undriven, the device activates a shutdown mode to turn off both external MOSFETs.
Feature Summary
- High-frequency gate driver optimized for synchronous DC/DC converter applications
- Rail-to-rail drive functionality reduces switching losses in high gate capacitance MOSFETs
- Independent input logic power supply matches controller IC signal amplitudes
- Internal level shifting allows operation at ground potentials up to 42V
Applications
- Synchronous DC/DC converters
- High-frequency gate driver circuits
- Multiphase step-down voltage regulation
Procurement Notes
Verify the specific suffix IDCB against the manufacturer datasheet to confirm package type and temperature range. Ensure the component source is authorized to avoid counterfeits. Check RoHS compliance status as per the latest official documentation. Confirm availability through official Analog Devices channels or authorized distributors.
Selection Notes
Select this component when driving two N-channel MOSFETs in synchronous buck converters requiring high speed. Consider the 42V ground voltage limit and 4V to 6.5V VCC operating range. Evaluate gate capacitance requirements to leverage the rail-to-rail drive benefits. Ensure compatibility with the control IC's logic signal levels.
Part Context
The LTC4449 series includes variants like the LTC4449IDCB, part of Linear Technology's (now Analog Devices) portfolio of power management ICs. It belongs to the family of high-speed synchronous MOSFET drivers, distinct from multiphase controllers or other mixer products sharing similar numbering prefixes.
Replacement Considerations
Consult official Analog Devices documentation for direct substitutes. Similar devices include the LTC4442 and LTC4443 series. Verify pinout compatibility and electrical specifications before substitution.
