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Analog Devices Inc. LTC4449IDCB#TRMPBF
- Part No.:
- LTC4449IDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4449IDCB#TRMPBF.pdf
- Description:
- IC GATE DRVR HALF-BRIDGE 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,470
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Product details
Overview
LTC4449IDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a high-speed dual N-channel MOSFET gate driver IC designed for synchronous buck converters. It features rail-to-rail output drivers, adaptive shoot-through protection, 3.2A peak pull-up and 4.5A peak pull-down current, 8ns/7ns rise/fall times into 3000pF, and operates from 4V to 6.5V VCC with up to 38V input supply voltage.
For engineers reviewing the LTC4449IDCB#TRMPBF datasheet, LTC4449IDCB#TRMPBF pinout, LTC4449IDCB#TRMPBF application, or LTC4449IDCB#TRMPBF equivalent, key selection criteria include bootstrapped high-side drive capability, separate VLOGIC supply for controller-level signal matching, undervoltage lockout on both VCC and VLOGIC rails, and nanosecond-scale propagation delays in high-density power modules.
Technical Context
The LTC4449IDCB#TRMPBF implements a three-state input stage with VLOGIC-proportional thresholds to enable controller-supply-matched logic interfacing and automatic shutdown when IN floats. Its internal level shifter translates logic signals to the bootstrapped high-side domain (up to 42V above TS), enabling robust top-gate drive in synchronous DC/DC topologies.
Adaptive shoot-through protection actively monitors external MOSFET voltages to prevent simultaneous conduction, while independent undervoltage lockout circuits on VCC (2.60–3.65V threshold) and VLOGIC (2.4–2.9V threshold) force both TG and BG outputs low during supply faults - critical for safe operation in distributed power architectures.
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 Schottky diode; defines minimum boost efficiency and gate overdrive margin. |
| Max Input Supply Voltage (TS) | 38V - sets maximum VIN rating for synchronous buck stage; determines high-side MOSFET drain voltage limit. |
| TG Peak Pull-Up Current | 3.2A - enables fast turn-on of high-Ciss N-channel MOSFETs; achieves 8ns rise time into 3000pF load. |
| BG Peak Pull-Down Current | 4.5A - ensures rapid low-side MOSFET turn-off and suppresses cross-conduction during high-dV/dt switching events. |
| Propagation Delay (tPHL(BG)) | 11ns - defines minimum dead-time resolution achievable without external timing circuitry in high-frequency (>1MHz) converters. |
| Undervoltage Lockout Hysteresis (VCC) | 160mV - prevents oscillatory output behavior during brown-out conditions; stabilizes system startup and fault recovery. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive under-hood power module applications requiring extended thermal reliability. |
Pinout & Package
Package: 8-lead (2mm × 3mm) plastic DFN with exposed thermal pad (Pin 9 = GND). Low-profile 0.75mm height enables ultra-thin power module integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TG (Pin 1) | High-side gate driver output | Swings between BOOST and TS; drives top N-MOSFET gate with rail-to-rail swing up to 42V above ground. |
| TS (Pin 2) | High-side MOSFET source node | Switching node reference for TG output and bootstrap capacitor return; must be routed with minimal inductance. |
| BG (Pin 3) | Low-side gate driver output | Swings between VCC and GND; delivers 4.5A peak pull-down to ensure fast turn-off and prevent shoot-through. |
| GND (Pins 4 & 9) | Chip ground / thermal pad | Primary return path for all supplies and outputs; exposed pad must be soldered to PCB ground plane for θJA = 64°C/W. |
| IN (Pin 5) | Three-state logic input | Accepts controller PWM signal; floating state triggers internal shutdown mode pulling both TG and BG low. |
| VLOGIC (Pin 6) | Input buffer supply | Defines input threshold levels (VIH/VIL); can be tied to controller supply for matched logic levels or to VCC for simplified routing. |
| VCC (Pin 7) | Driver output supply | Powers BG directly and TG indirectly via external bootstrap diode; bypass capacitor required between VCC and GND. |
| BOOST (Pin 8) | High-side bootstrapped supply | Connected to external capacitor between BOOST and TS; voltage swings from VCC–VD to VIN+VCC–VD (VD = Schottky forward drop). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Enables full gate overdrive (VGS) across wide VIN range - maximizes RDS(ON) reduction in high-current N-MOSFETs. |
| Adaptive shoot-through protection | Monitors real-time TS and BG voltages to dynamically enforce non-overlapping gate drive - eliminates need for external dead-time controllers. |
| Separate VLOGIC supply | Allows input thresholds to track controller supply voltage (e.g., 3.3V or 5V), preventing false triggering due to logic-level mismatch. |
| Internal shutdown on IN float | Prevents uncontrolled MOSFET conduction during controller reset or loss-of-signal - critical for system safety in power sequencing. |
| Undervoltage lockout on VCC & VLOGIC | Independent UVLO circuits disable both outputs if either supply drops below guaranteed operating threshold - avoids partial drive and MOSFET damage. |
Applications
| Server VRMs | Telecom Power Modules |
|---|---|
Use Scenario: 1.2V/50A two-phase buck converter powering CPU cores in data center servers. IC Role / Device Role / Timing Role: Dual N-MOSFET gate driver synchronizing high-frequency (600kHz) switching of HAT2160H/HAT2167H power stages with precise dead-time control. Use Value: 4.5A BG pull-down current suppresses cross-conduction during 100A/ns dV/dt transients, improving efficiency by >0.8% at full load. | Use Scenario: Compact 48V-to-12V intermediate bus converter in 1RU telecom shelf systems. IC Role / Device Role / Timing Role: High-side/low-side gate driver enabling <20ns propagation delay matching for paralleled phase operation and EMI reduction. Use Value: 8ns TG rise time into 3nF load ensures <50ns total switching transition, supporting >1MHz operation while maintaining <1% duty cycle loss. |
| Industrial Motor Drives | Automotive ADAS Power Supplies |
Use Scenario: 24V input synchronous buck supplying isolated gate drivers for IGBT half-bridge in servo inverters. IC Role / Device Role / Timing Role: Robust gate driver tolerant of 38V max TS voltage and –40°C to +125°C junction temperature for harsh factory environments. Use Value: VLOGIC-referenced input thresholds maintain noise immunity across wide temperature range, eliminating false triggering during thermal cycling. | Use Scenario: 12V-to-1.1V point-of-load regulator for radar processor SoC in automotive ADAS domain controller. IC Role / Device Role / Timing Role: High-speed driver enabling 2MHz switching with adaptive shoot-through protection to meet ASIL-B functional safety requirements. Use Value: Independent VCC/VLOGIC UVLO ensures fail-safe shutdown during battery brown-out, preventing unsafe MOSFET conduction during cold-crank conditions. |
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 |
|---|---|---|---|
| LTC4442IDCB#TRMPBF | Lower peak pull-down (5A vs 4.5A), higher VCC range (6–9.5V), no adaptive shoot-through protection - uses fixed dead-time. | Suitable for lower-frequency (<500kHz) buck converters where layout-controlled dead-time suffices. | Select when cost sensitivity outweighs need for dynamic shoot-through prevention and ultra-fast fall times. |
| LTC4444IDCB#TRMPBF | Higher max TS voltage (100V), dual supply (4.5V/7.2V VCC options), lower peak pull-up (3A), no VLOGIC pin - single-supply logic interface. | Targeted at high-input-voltage industrial SMPS (e.g., 48V–72V input) with simpler controller interface requirements. | Choose for >60V VIN applications where LTC4449IDCB#TRMPBF's 38V TS limit is insufficient. |
Compared with LTC4442IDCB#TRMPBF and LTC4444IDCB#TRMPBF, the LTC4449IDCB#TRMPBF uniquely combines VLOGIC-referenced input thresholds, adaptive shoot-through protection, and optimized 4.5A pull-down for high-frequency, high-reliability synchronous buck designs below 38V input.
Availability
LTC4449IDCB#TRMPBF is available at Aetrix Electronics and suitable for server VRMs, telecom power modules, and industrial motor drives requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade (–40°C to +125°C).
Supply support for LTC4449IDCB#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC4449IDCB#TRMPBF belongs to Linear's high-speed power driver product line, engineered specifically for high-efficiency, high-density synchronous DC/DC converters in datacenter, telecom, and industrial power systems.
FAQ
What is the function of the VLOGIC pin on the LTC4449IDCB#TRMPBF?
The VLOGIC pin on the LTC4449IDCB#TRMPBF powers the input buffer and sets input threshold voltages (VIH/VIL) proportional to its supply level. It allows direct connection to the PWM controller's logic supply (e.g., 3.3V or 5V) for matched signal levels, or to VCC for simplified routing. The LTC4449IDCB#TRMPBF internally regulates thresholds for VLOGIC >5V to prevent overdrive.
Does the LTC4449IDCB#TRMPBF require an external bootstrap diode?
Yes, the LTC4449IDCB#TRMPBF requires an external Schottky diode between VCC (Pin 7) and BOOST (Pin 8) to charge the bootstrap capacitor. This diode enables high-side gate drive above the TS switching node. The LTC4449IDCB#TRMPBF does not integrate this diode; typical selections include 1A/40V Schottky devices with VF <0.4V.
How does adaptive shoot-through protection work in the LTC4449IDCB#TRMPBF?
The LTC4449IDCB#TRMPBF continuously monitors TS and BG voltages to detect imminent cross-conduction. It dynamically delays BG turn-on until TG is sufficiently discharged and vice versa - unlike fixed dead-time schemes, this adapts to MOSFET characteristics and temperature drift. This function is fully internal and requires no external components.
What is the purpose of the exposed thermal pad (Pin 9) on the LTC4449IDCB#TRMPBF?
The exposed thermal pad (Pin 9) on the LTC4449IDCB#TRMPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve the specified θJA of 64°C/W. Omitting this connection increases thermal resistance significantly, risking junction overheating above 125°C during sustained 4.5A pull-down operation.
Can the LTC4449IDCB#TRMPBF drive both high-side and low-side N-channel MOSFETs in a half-bridge configuration?
Yes, the LTC4449IDCB#TRMPBF is explicitly designed to drive dual N-channel MOSFETs in synchronous buck (half-bridge) configurations. TG (Pin 1) drives the high-side MOSFET gate referenced to TS, while BG (Pin 3) drives the low-side MOSFET gate referenced to GND - both with rail-to-rail swing and independently controlled shoot-through protection.
LTC4449IDCB#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)
LTC4449IDCB#TRMPBF FAQ
1.How can I place an order for LTC4449IDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4449IDCB#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 LTC4449IDCB#TRMPBF reliable?
The price and inventory of LTC4449IDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4449IDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4449IDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4449IDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4449IDCB#TRMPBF?
LTC4449IDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4449IDCB#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 LTC4449IDCB#TRMPBF?
For technical support, including LTC4449IDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4449IDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC4449IDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4449IDCB#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 LTC4449IDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4449IDCB#TRMPBF?
All LTC4449IDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4449IDCB#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 LTC4449IDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4449IDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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