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Analog Devices Inc. LTC4449EDCB#TRPBF
- Part No.:
- LTC4449EDCB#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4449EDCB#TRPBF.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,441
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Product details
Overview
LTC4449EDCB#TRPBF 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 into 3000pF, operates with 4V–6.5V VCC supply, and integrates adaptive shoot-through protection - enabling efficient, reliable control of high-frequency power stages in distributed power architectures.
For engineers reviewing the LTC4449EDCB#TRPBF datasheet, LTC4449EDCB#TRPBF pinout, LTC4449EDCB#TRPBF application, or LTC4449EDCB#TRPBF equivalent, key selection considerations include its rail-to-rail output swing, separate VLOGIC supply for controller-level signal matching, undervoltage lockout on both VCC and VLOGIC rails, and validated 2mm × 3mm DFN package thermal performance up to 125°C junction temperature.
Technical Context
The LTC4449EDCB#TRPBF implements a three-state input stage with VLOGIC-proportional thresholds (VIH/VIL), enabling seamless interfacing with PWM controllers operating at 3.3V or 5V logic levels. Its internal level shifter translates the ground-referenced IN signal to the bootstrapped high-side domain referenced to TS.
It features dual independent output stages: TG drives the high-side MOSFET between BOOST and TS using an NPN+PMOS parallel pull-up and NMOS pull-down; BG drives the low-side MOSFET between VCC and GND with enhanced 4.5A peak pull-down via NPN-boosted NMOS. Adaptive shoot-through protection actively monitors voltage transitions to prevent simultaneous conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 4V to 6.5V - powers low-side driver and bootstrapped high-side circuitry; stable operation within typical DC/DC controller bias range. |
| TG Peak Pull-Up Current | 3.2A - enables rapid turn-on of high-gate-charge MOSFETs, reducing switching loss in high-current synchronous buck stages. |
| BG Peak Pull-Down Current | 4.5A - ensures fast, robust low-side turn-off to suppress cross-conduction during high-dV/dt node transitions. |
| TG Rise/Fall Time (3nF) | 8ns / 7ns - verified timing into realistic gate capacitance loads, supporting >1MHz converter operation with minimal dead-time penalty. |
| UVLO Thresholds | VCC: 2.75V (rising), VLOGIC: 2.5V (rising) - prevents erratic output behavior during brown-out conditions on either supply rail. |
| Operating Junction Temp | –40°C to 125°C - qualified for industrial and telecom power module environments with full parameter assurance. |
| Package | 8-lead 2mm × 3mm DFN (DCB) with exposed pad - provides 10.6°C/W θJC and 64°C/W θJA for high-power-density thermal management. |
Pinout & Package
The LTC4449EDCB#TRPBF is housed in an 8-lead plastic DFN package (2mm × 3mm, 0.75mm height) with exposed thermal pad (Pin 9) that must be soldered to PCB ground for optimal electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | High-side gate driver output | Swings rail-to-rail between BOOST and TS; drives top N-MOSFET gate with 3.2A pull-up / 2.4A pull-down capability. |
| TS (Pin 2) | High-side MOSFET source connection | Reference node for TG output and bootstrap capacitor return; carries high-frequency switch-node voltage (up to 38V). |
| BG (Pin 3) | Low-side gate driver output | Swings rail-to-rail between VCC and GND; delivers 4.5A peak pull-down to ensure fast, noise-immune turn-off. |
| GND (Pins 4 & 9) | Chip ground / thermal pad | Primary reference for logic, low-side driver, and internal UVLO; exposed pad (Pin 9) is mandatory for thermal integrity. |
| IN (Pin 5) | Digital input signal | Three-state interface with VLOGIC-scaled thresholds; floating state triggers shutdown mode pulling both TG and BG low. |
| VLOGIC (Pin 6) | Logic supply input | Powers input buffer and level shifter; sets VIH/VIL thresholds proportional to supply (3V–6.5V); may tie to controller rail or VCC. |
| VCC (Pin 7) | Driver supply input | Powers low-side driver directly and high-side driver via external Schottky diode to BOOST; bypass capacitor required. |
| BOOST (Pin 8) | High-side bootstrapped supply | Connected to external capacitor between BOOST and TS; supplies high-side driver during top-FET conduction phase. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Enables full VGS overdrive on N-MOSFETs - critical for minimizing RDS(ON) and conduction losses in high-efficiency power stages. |
| Adaptive shoot-through protection | Monitors TS and gate dynamics in real time to delay complementary FET turn-on - eliminates cross-conduction without fixed dead-time programming. |
| Separate VLOGIC supply | Allows input threshold matching to controller IC's output voltage (e.g., 3.3V or 5V), eliminating level-shifter components and layout complexity. |
| Undervoltage lockout (dual-rail) | Independent UVLO on VCC and VLOGIC ensures both driver and logic domains are valid before enabling outputs - prevents partial operation faults. |
| Shutdown mode on floating IN | Internal resistive divider pulls IN into high-impedance region when controller is inactive - forces both TG and BG low for safe power-stage disable. |
Applications
| Synchronous Buck Converter | Distributed Power Architecture |
|---|---|
|
Use Scenario: Point-of-load (POL) regulation in server CPU/GPU VRMs delivering 1.2V/50A with 600kHz switching. IC Role / Device Role / Timing Role: Dual N-MOSFET driver controlling high-side and low-side switches in a 2-phase interleaved buck topology. Use Value: 8ns/7ns rise/fall times minimize transition losses; 4.5A BG pull-down suppresses dV/dt-induced false turn-on in high-current, high-dI/dt layouts. |
Use Scenario: Telecom rectifier modules distributing 12V/48V intermediate bus power across multiple daughterboards. IC Role / Device Role / Timing Role: High-voltage gate driver for 38V-rated N-MOSFETs in isolated/non-isolated secondary-side synchronous rectification. Use Value: 38V max TS rating and adaptive shoot-through protection ensure reliability under transient overvoltage and load-step conditions. |
| High-Density Power Module | Industrial DC/DC Converter |
|
Use Scenario: Compact 25mm × 25mm µModule integrating controller, drivers, MOSFETs, and inductor for FPGA core supply. IC Role / Device Role / Timing Role: Space-optimized gate driver enabling <2mm profile with thermal pad soldered to internal ground plane. Use Value: 2mm × 3mm DFN package with 0.75mm height meets strict board thickness constraints while maintaining 125°C junction rating. |
Use Scenario: Programmable logic controller (PLC) power supply requiring –40°C to 85°C ambient operation with long-term reliability. IC Role / Device Role / Timing Role: Robust gate driver for industrial-grade synchronous buck converting 24V input to 5V/3.3V system rails. Use Value: Guaranteed –40°C to 125°C junction operation and dual-rail UVLO prevent latch-up or erratic behavior in uncontrolled thermal environments. |
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#TRPBF | Lower VCC range (6V–9.5V), lower peak pull-down (2.4A), no adaptive shoot-through (fixed dead-time only) | Better suited for mid-voltage (12V input) buck converters where 38V TS rating is unnecessary | Select when VCC ≥6V is available and shoot-through risk is mitigated by external timing control |
| LTC4444EDCB#TRPBF | Higher VIN rating (100V), higher VCC range (4.5V–13.5V), integrated bootstrap diode, 3A pull-up / 0.55Ω pull-down | Targeted at high-input-voltage applications (e.g., 48V telecom, PoE++), not optimized for sub-12V POL | Choose for >38V input systems requiring integrated bootstrap diode and wider VCC flexibility |
Compared with LTC4442EDCB#TRPBF and LTC4444EDCB#TRPBF, the LTC4449EDCB#TRPBF uniquely balances 38V TS tolerance, 4.5A BG pull-down strength, and adaptive shoot-through protection in a compact DFN - making it optimal for high-efficiency, high-frequency, medium-input-voltage synchronous buck designs where layout space and thermal density are constrained.
Availability
LTC4449EDCB#TRPBF is available at Aetrix Electronics and suitable for synchronous buck converters, distributed power architectures, and high-density power modules requiring stable component supply, guaranteed industrial temperature grading (–40°C to 125°C), and long-term production continuity.
Supply support for LTC4449EDCB#TRPBF 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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, communications, and power conversion markets.
The LTC4449EDCB#TRPBF belongs to Linear's high-speed gate driver product line, engineered specifically for efficiency-critical synchronous DC/DC converters where fast switching, shoot-through immunity, and thermal compactness are essential design requirements.
FAQ
What is the maximum allowable voltage on the TS pin of the LTC4449EDCB#TRPBF?
The TS pin of the LTC4449EDCB#TRPBF has an absolute maximum rating of 38V. This allows direct connection to switch nodes in 24V and 36V input synchronous buck converters. Operation above this voltage risks permanent damage. The device is specified to operate reliably with TS voltages up to 38V under normal conditions, and its adaptive shoot-through protection remains active across this full range.
Does the LTC4449EDCB#TRPBF require an external bootstrap diode?
Yes, the LTC4449EDCB#TRPBF requires an external Schottky diode between VCC (Pin 7) and BOOST (Pin 8) to charge the bootstrap capacitor during low-side conduction. The datasheet specifies a low-forward-voltage Schottky diode (e.g., 1N5819 or equivalent) to minimize voltage drop and ensure sufficient BOOST voltage for high-side drive. No internal diode is integrated.
Can the LTC4449EDCB#TRPBF drive both high-side and low-side MOSFETs in a half-bridge configuration?
Yes, the LTC4449EDCB#TRPBF is explicitly designed for half-bridge (synchronous buck) topologies: TG (Pin 1) drives the high-side N-MOSFET gate referenced to TS, and BG (Pin 3) drives the low-side N-MOSFET gate referenced to GND. Its pinout, timing specs, and adaptive shoot-through logic are optimized for this dual-drive role - confirmed in the Typical Application circuits and Block Diagram.
What is the purpose of the VLOGIC pin on the LTC4449EDCB#TRPBF?
The VLOGIC pin (Pin 6) on the LTC4449EDCB#TRPBF powers the input buffer and sets the VIH/VIL thresholds proportionally to its voltage (3V–6.5V). It enables direct interfacing with 3.3V or 5V PWM controllers without external level shifters. Tying VLOGIC to the controller's supply rail ensures matched logic thresholds, while connecting it to VCC simplifies routing - both configurations are supported and characterized.
How does the adaptive shoot-through protection work in the LTC4449EDCB#TRPBF?
The LTC4449EDCB#TRPBF's adaptive shoot-through protection monitors the TS node voltage and internal gate signals to dynamically delay the turn-on of the complementary MOSFET until the conducting FET is fully off. Unlike fixed dead-time schemes, it responds to actual switching dynamics - preventing cross-conduction current without adding unnecessary delay, thereby maximizing efficiency and reliability in high-frequency operation.
LTC4449EDCB#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC4449EDCB#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4449EDCB#TRPBF 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#TRPBF reliable?
The price and inventory of LTC4449EDCB#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4449EDCB#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4449EDCB#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4449EDCB#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4449EDCB#TRPBF?
LTC4449EDCB#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4449EDCB#TRPBF 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#TRPBF?
For technical support, including LTC4449EDCB#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4449EDCB#TRPBF requirements.
6.How does Aetrix verify that LTC4449EDCB#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4449EDCB#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4449EDCB#TRPBF?
All LTC4449EDCB#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4449EDCB#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC4449EDCB#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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