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Analog Devices Inc. LTC4449EDCB#TRMPBF
- Part No.:
- LTC4449EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4449EDCB#TRMPBF.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
LTC4449EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a high-speed dual N-channel MOSFET gate driver IC designed for synchronous buck converters. It delivers 3.2A peak pull-up and 4.5A peak pull-down current, achieves 8ns TG rise time and 7ns TG fall time into 3000pF, operates with 4V–6.5V VCC supply, and integrates adaptive shoot-through protection and undervoltage lockout. It drives top- and bottom-gate MOSFETs in high-density power modules.
For engineers reviewing the LTC4449EDCB#TRMPBF datasheet, LTC4449EDCB#TRMPBF pinout, LTC4449EDCB#TRMPBF application, or LTC4449EDCB#TRMPBF equivalent, key selection criteria include bootstrapped high-side drive capability, rail-to-rail output swing, separate VLOGIC supply matching PWM controller logic levels, nanosecond-scale propagation delays, and thermal performance in the 2mm × 3mm DFN package.
Technical Context
The LTC4449EDCB#TRMPBF implements a three-state input stage with VLOGIC-proportional thresholds to enable controlled shutdown when the controller signal floats. Its internal level shifter translates logic-level IN signals to the bootstrapped BOOST domain, supporting up to 42V above TS.
It features independent undervoltage lockout on both VLOGIC (2.65V falling threshold) and VCC (3.04V falling threshold), plus adaptive shoot-through protection that prevents simultaneous conduction by monitoring gate-source voltage transitions of external MOSFETs before enabling complementary switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4V to 6.5V - powers low-side driver directly and high-side driver via external bootstrap diode; enables compatibility with common controller VCC rails. |
| Peak Pull-Down Current (BG) | 4.5A - ensures rapid turn-off of low-side MOSFET under heavy capacitive load, minimizing cross-conduction risk during high-dV/dt transitions. |
| TG Rise/Fall Time (3nF) | 8ns / 7ns - reduces MOSFET switching losses in high-frequency (>600kHz) synchronous buck stages with large gate charge devices. |
| Input Threshold Hysteresis | ≥100mV - suppresses false triggering from noise coupling on IN pin during fast switch-node transients. |
| Operating Junction Temp | –40°C to 125°C - validated across full industrial temperature range; supports operation in thermally constrained power modules. |
| UVLO Hysteresis (VCC) | 160mV - prevents oscillatory behavior near supply brownout by ensuring clean re-enable after recovery. |
| Package Thermal Resistance | θJA = 64°C/W - requires exposed pad soldering to PCB ground plane to maintain safe junction temperature at full load. |
Pinout & Package
The LTC4449EDCB#TRMPBF is housed in an 8-lead, 2mm × 3mm plastic DFN package (DCB) with exposed thermal pad (Pin 9, GND). The package height is 0.75mm, optimized for low-profile power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | High-side gate driver output | Swings between TS and BOOST; drives top N-MOSFET gate with rail-to-rail voltage; rated for 3.2A peak pull-up/2.4A peak pull-down. |
| TS (Pin 2) | High-side MOSFET source connection | Reference node for TG output and BOOST capacitor; must be routed with low-inductance path to minimize ringing during switching. |
| BG (Pin 3) | Low-side gate driver output | Swings between VCC and GND; drives bottom N-MOSFET gate; delivers 4.5A peak pull-down for fast turn-off. |
| GND (Pins 4 & 9) | Chip ground / thermal pad | Primary return for logic, driver, and power paths; exposed pad (Pin 9) must be soldered to PCB ground plane for thermal and electrical integrity. |
| IN (Pin 5) | Digital input signal | Three-state compatible; floating state triggers internal shutdown pulling both BG and TG low; threshold scales with VLOGIC supply. |
| VLOGIC (Pin 6) | Logic supply input | Powers input buffer and level shifter; sets VIH/VIL thresholds; can be tied to controller supply (e.g., 3.3V or 5V) for matched logic levels. |
| VCC (Pin 7) | Driver supply input | Powers low-side driver directly and high-side driver via external Schottky diode to BOOST; bypass capacitor required between VCC and GND. |
| BOOST (Pin 8) | High-side bootstrapped supply | Connected via external capacitor to TS; voltage swings from VCC–VD to VIN+VCC–VD; enables high-side N-MOSFET drive without isolated supply. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive shoot-through protection | Monitors real-time gate-source voltages of external MOSFETs to delay complementary switching until safe turn-off is confirmed-eliminates cross-conduction without fixed dead-time programming. |
| Rail-to-rail output drivers | Enables full VGS overdrive (e.g., VCC–0V for BG, BOOST–TS for TG), reducing RDS(ON) and conduction loss in high-current N-MOSFETs. |
| Separate VLOGIC supply | Allows input logic thresholds to track controller supply (e.g., 3.3V or 5V), eliminating level-shifter components and improving noise immunity in mixed-voltage systems. |
| Undervoltage lockout (dual) | Independent UVLO on VLOGIC and VCC ensures both control and power domains are stable before enabling gate drive-prevents erratic switching during supply ramp-up or brownout. |
| Thermal shutdown protection | Activates at TJ > 160°C, pulling BG and TG low to halt switching; resumes operation only after cooling to <135°C-protects against sustained overload or poor heatsinking. |
Applications
| Synchronous Buck Converter | Distributed Power Architecture |
|---|---|
Use Scenario: 1.2V/50A two-phase step-down converter using LTC3860 controller and HAT2160H/HAT2167H MOSFETs. IC Role / Device Role: Dual N-MOSFET gate driver providing high-current, low-propagation-delay switching for top- and bottom-gate control. Use Value: Enables 600kHz operation with minimal switching loss and no external dead-time circuitry due to adaptive shoot-through protection. |
Use Scenario: Intermediate bus converter in telecom or server rack delivering 12V from 48V input with tight regulation and high efficiency. IC Role / Device Role: High-side and low-side gate driver for synchronous rectification in non-isolated DC/DC modules. Use Value: 38V max input rating and robust 4.5A pull-down support reliable operation under transient overvoltage conditions typical in distributed bus systems. |
| High-Density Power Module | Industrial Motor Drive Half-Bridge |
Use Scenario: Compact 25mm × 25mm × 8mm power module targeting data center ASIC supplies. IC Role / Device Role: Space-constrained gate driver with 2mm × 3mm DFN footprint and 0.75mm profile. Use Value: Exposed-pad thermal design and 64°C/W θJA allow >3A continuous drive current within strict height limits without forced air. |
Use Scenario: Low-voltage (<38V) BLDC motor control half-bridge driving 3000pF gate capacitance at 20kHz PWM. IC Role / Device Role: High-speed N-MOSFET driver with precise timing control and shoot-through prevention. Use Value: 11ns–14ns propagation delays and sub-10ns edge rates ensure accurate phase alignment and reduced torque ripple in closed-loop motor control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed synchronous N-channel MOSFET driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4442EDCB#TRMPBF | Lower VCC range (6V–9.5V); 2.4A peak pull-up / 5A peak pull-down; no adaptive shoot-through (fixed dead-time). | Requires external dead-time control; better suited for lower-frequency (<300kHz) designs where fixed timing suffices. | Select when VCC ≥6V is available and adaptive protection is not required; offers higher pull-down current but less timing flexibility. |
| LTC4444IDCB#TRPBF | Higher VIN rating (up to 100V); 4.5V/7.2V–13.5V VCC range; 3A peak pull-up / 0.55Ω pull-down impedance. | Designed for high-input-voltage industrial or automotive DC/DC; lacks separate VLOGIC supply. | Choose for >38V input systems requiring robust high-side drive; not drop-in due to different pinout and logic interface architecture. |
Compared with LTC4442EDCB#TRMPBF and LTC4444IDCB#TRPBF, the LTC4449EDCB#TRMPBF uniquely balances 4V–6.5V VCC compatibility, adaptive shoot-through, and separate VLOGIC-making it optimal for modern low-voltage, high-frequency controller-driven buck converters where timing precision and supply flexibility are critical.
Availability
LTC4449EDCB#TRMPBF is available at Aetrix Electronics and suitable for synchronous buck converters, distributed power architectures, high-density power modules, and industrial motor drive half-bridges requiring stable component supply and long-term production continuity.
Supply support for LTC4449EDCB#TRMPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio. Linear Technology was founded in 1981 and specialized in precision, high-reliability ICs for demanding power and signal conditioning applications.
The LTC4449EDCB#TRMPBF belongs to Linear's high-speed gate driver product line, engineered specifically for high-efficiency, high-frequency synchronous DC/DC conversion in space- and thermally-constrained environments such as computing, telecom, and industrial power systems.
FAQ
What is the maximum allowable voltage on the BOOST pin of the LTC4449EDCB#TRMPBF?
The BOOST pin of the LTC4449EDCB#TRMPBF supports a maximum voltage of 42V above TS, per Absolute Maximum Ratings. This allows reliable high-side gate drive in buck converters with input voltages up to 38V, provided the external bootstrap capacitor and Schottky diode are rated accordingly. Exceeding 42V relative to TS risks permanent damage.
Does the LTC4449EDCB#TRMPBF require external bootstrap diodes and capacitors?
Yes, the LTC4449EDCB#TRMPBF requires an external Schottky diode between VCC and BOOST, and an external capacitor between BOOST and TS. These components form the bootstrap network essential for high-side N-MOSFET gate drive. The datasheet recommends low-ESR ceramic capacitors (e.g., 100nF X7R) and Schottky diodes with VF <0.5V and fast recovery.
How does the three-state input functionality work on the LTC4449EDCB#TRMPBF?
The LTC4449EDCB#TRMPBF's IN pin interprets three voltage states: high (VIH), low (VIL), and floating. When IN floats, an internal resistive divider pulls it into a mid-threshold zone, forcing both TG and BG outputs low-shutting off external MOSFETs. This enables safe controller power sequencing and fault-safe shutdown without external circuitry.
Can the LTC4449EDCB#TRMPBF drive MOSFETs with gate charges exceeding 100nC?
Yes, the LTC4449EDCB#TRMPBF can drive high-QG MOSFETs: its 3.2A peak pull-up and 4.5A peak pull-down currents deliver fast edge rates even into 3000pF loads (8ns/7ns). For MOSFETs with QG >100nC, ensure adequate VCC/BOOST supply decoupling and thermal management, as gate charge loss (PQG ≈ 2×VCC×QG×fSW) dominates total power dissipation.
What is the purpose of the exposed thermal pad (Pin 9) on the LTC4449EDCB#TRMPBF?
The exposed thermal pad (Pin 9) on the LTC4449EDCB#TRMPBF is electrically GND and serves dual roles: it provides the primary thermal conduction path (θJC = 10.6°C/W) and lowers overall θJA to 64°C/W when soldered to a PCB ground plane. Failure to solder this pad results in severe thermal derating and potential junction overheating under load.
LTC4449EDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Half-Bridge
- Channel Type:
- Synchronous
- Number of Drivers:
- 2
- Gate Type:
- N-Channel MOSFET
- 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
- High Side Voltage - Max (Bootstrap):
- 42 V
- Rise / Fall Time (Typ):
- 8ns, 7ns
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LTC4449EDCB#TRMPBF FAQ
1.How can I place an order for LTC4449EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4449EDCB#TRMPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC4449EDCB#TRMPBF reliable?
The price and inventory of LTC4449EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4449EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4449EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4449EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4449EDCB#TRMPBF?
LTC4449EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4449EDCB#TRMPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC4449EDCB#TRMPBF?
For technical support, including LTC4449EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4449EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC4449EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4449EDCB#TRMPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC4449EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4449EDCB#TRMPBF?
All LTC4449EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4449EDCB#TRMPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC4449EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4449EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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