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Analog Devices Inc. LTC4440IMS8E#PBF
- Part No.:
- LTC4440IMS8E#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4440IMS8E#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
LTC4440IMS8E#PBF from Analog Devices (formerly Linear Technology) is a high-speed, high-voltage high-side N-channel MOSFET gate driver designed for synchronous full-bridge and phase-modulated converters. It operates with TS voltages up to 80V continuous and withstands 100V transients, delivers 2.4A peak pull-up current and 1.5Ω pull-down impedance, and achieves 10ns rise / 7ns fall times driving 1nF loads - enabling efficient switching in telecom and server power supplies.
For engineers reviewing the LTC4440IMS8E#PBF datasheet, LTC4440IMS8E#PBF pinout, LTC4440IMS8E#PBF application, or LTC4440IMS8E#PBF equivalent, key selection criteria include its 80V TS rating, bootstrap-compatible 8–15V VCC range, TTL/CMOS input with 350mV hysteresis, dual UVLO (VCC and BOOST–TS), and thermally enhanced MSOP-8 package with exposed ground pad.
Technical Context
The LTC4440IMS8E#PBF integrates a level-shifted input stage that references INP to GND while driving TG relative to TS, enabling ground-referenced control of high-side MOSFETs floating up to 100V above ground. Its output stage uses an NPN bipolar pull-up (Q1) and N-channel MOSFET pull-down (N1), delivering asymmetric drive strength optimized for fast turn-on and robust turn-off under high dV/dt conditions.
It features independent undervoltage lockout on both VCC (6.2V falling threshold) and BOOST–TS (6.9V falling threshold), forcing TG low to TS when either supply drops out. The device supports operation across –40°C to +125°C ambient, with thermal performance dependent on soldering the exposed pad (Pin 9) to PCB ground - reducing θJA to 40°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| TS Voltage Rating | 80V continuous, 100V/100ms transient - enables use in 48V/54V telecom systems with surge immunity. |
| Peak Pull-Up Current | 2.4A at –40°C to +125°C - ensures rapid MOSFET turn-on even at max junction temperature. |
| Pull-Down Resistance | 1.5Ω typical at –40°C to +125°C - provides strong gate discharge to prevent shoot-through during high-dV/dt transitions. |
| Rise/Fall Time | 10ns/7ns into 1nF load at VBOOST–TS = 12V - minimizes MOSFET switching losses in high-frequency converters. |
| Input Threshold Hysteresis | 350mV - eliminates noise-induced false triggering in noisy high-power environments. |
| VCC UVLO Threshold | 6.2V (falling), 6.5V (rising) - prevents erratic operation during brown-out conditions in industrial power rails. |
| BOOST–TS UVLO Threshold | 6.9V (falling), 7.4V (rising) - safeguards gate drive integrity when bootstrap capacitor voltage sags. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8E) with exposed die pad (Pin 9 = GND), 1mm profile, θJA = 40°C/W when exposed pad is soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Low-side supply input | Powers internal logic and level shifter; requires local 1µF ceramic bypass to GND (Pin 2). |
| GND (Pin 2) | Low-side reference ground | Return path for VCC and INP; must be connected to system ground with low-inductance trace. |
| INP (Pin 3) | Digital input signal | TTL/CMOS-compatible, ground-referenced; 1.25V/1.6V thresholds with 350mV hysteresis. |
| TS (Pin 4) | High-side source reference | Connects to MOSFET source terminal; defines lower rail for TG output swing. |
| TG (Pin 5) | Gate driver output | Swings between TS and BOOST; drives MOSFET gate with 2.4A peak pull-up and 1.5Ω pull-down. |
| BOOST (Pin 6) | Bootstrap supply node | Connected via external capacitor to TS; supplies high-side driver stage; swings up to VIN + VCC – VF. |
| NC (Pin 7) | No connect | Not internally bonded; may be left floating or tied to BOOST for layout convenience. |
| GND (Pin 8) | Secondary low-side ground | Second GND connection for improved grounding; must be tied to Pin 2 and exposed pad. |
| Exposed Pad (Pin 9) | Thermal & electrical ground | Mandatory GND connection; soldering required for thermal performance and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Supply-independent input thresholds | VIH = 1.6V, VIL = 1.25V, hysteresis = 350mV - eliminates need for external level shifting in mixed-supply systems. |
| Asymmetric output drive strength | 2.4A peak pull-up + 1.5Ω pull-down - balances fast turn-on with strong Miller discharge to suppress shoot-through. |
| Dual independent UVLO protection | VCC UVLO (6.2V) and BOOST–TS UVLO (6.9V) - ensures safe shutdown if either supply fails, preventing partial drive. |
| Robust transient tolerance | 100V/100ms TS transient rating - sustains operation during line surges without latch-up or damage. |
| Thermally enhanced MSOP-8 | Exposed pad reduces θJA to 40°C/W - enables reliable operation at 125°C ambient in high-density power modules. |
Applications
| Telecom Power Systems | Distributed Power Architectures |
|---|---|
|
Use Scenario: 48V input DC/DC converter in central office equipment handling 100V lightning-induced transients. IC Role / Device Role / Timing Role: High-side gate driver for synchronous rectification in full-bridge topology, referenced to floating TS node. Use Value: 100V transient tolerance and dual UVLO ensure uninterrupted operation during grid disturbances without system reset. |
Use Scenario: Intermediate bus converter (36–72V input) feeding point-of-load regulators in blade servers. IC Role / Device Role / Timing Role: High-speed gate driver controlling high-side MOSFETs in phase-modulated full-bridge configuration. Use Value: 10ns/7ns switching times reduce conduction losses in 300–500kHz designs, improving efficiency by >0.8% at full load. |
| Server Power Supplies | High-Density Power Modules |
|
Use Scenario: 12V/35A isolated full-bridge supply using Si7852DP MOSFETs in datacenter PSUs. IC Role / Device Role / Timing Role: Gate driver interfacing LTC3722-1 controller to high-side N-channel MOSFETs with bootstrap biasing. Use Value: 2.4A peak current ensures <10ns MOSFET turn-on even with 1.5nF total gate charge, minimizing overlap losses. |
Use Scenario: Compact 1/4-brick DC/DC module requiring minimal footprint and thermal resistance. IC Role / Device Role / Timing Role: High-voltage gate driver in thermally constrained layout where exposed-pad MSOP enables direct copper attachment. Use Value: Exposed pad soldering reduces junction-to-ambient thermal resistance to 40°C/W, allowing 125°C ambient operation without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4444ES6#PBF | Higher TS rating (100V continuous), includes shoot-through protection, 3A pull-up, 0.55Ω pull-down; requires 4.5–13.5V VCC. | Targeted at ultra-rugged applications like industrial motor drives where cross-conduction risk is critical. | Select LTC4444ES6#PBF only if shoot-through protection is mandatory and 100V continuous TS operation is required. |
| LTC4442EMS8E#PBF | Lower TS rating (38V), 6–9.5V VCC range, no BOOST–TS UVLO, 1.5A pull-up, 2.5Ω pull-down; same MSOP-8 package. | Suitable for lower-voltage isolated DC/DC (e.g., 24V input) where cost and simpler biasing are prioritized over ruggedness. | Choose LTC4442EMS8E#PBF for cost-sensitive 24V telecom or embedded applications without 100V transients. |
Compared with LTC4440IMS8E#PBF, LTC4444ES6#PBF adds shoot-through protection and higher TS rating but increases complexity and cost, while LTC4442EMS8E#PBF trades ruggedness and drive strength for lower voltage operation and reduced BOM count - making LTC4440IMS8E#PBF the optimal balance for 48V/54V telecom and server power with transient immunity.
Availability
LTC4440IMS8E#PBF is available at Aetrix Electronics and suitable for telecom power systems, distributed power architectures, and server power supplies requiring stable component supply, extended temperature operation (–40°C to +125°C), and high-voltage transient resilience.
Supply support for LTC4440IMS8E#PBF 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 full product support, datasheets, and application engineering for legacy Linear parts including the LTC4440 series.
The LTC4440 belongs to Linear's high-voltage gate driver product line, engineered specifically for isolated DC/DC converters in telecom, server, and industrial power where reliability under voltage transients and precise timing control are critical.
FAQ
What is the maximum continuous TS voltage rating for the LTC4440IMS8E#PBF?
The LTC4440IMS8E#PBF has a maximum continuous TS voltage rating of 80V, with capability to withstand 100V transients for up to 100ms without functional interruption or damage. This rating is validated across the full –40°C to +125°C operating temperature range and is specified in the Absolute Maximum Ratings table of the official datasheet.
Does the LTC4440IMS8E#PBF require external bootstrap diode and capacitor?
Yes, the LTC4440IMS8E#PBF requires an external bootstrap diode (typically Schottky) between VCC and BOOST, and an external ceramic capacitor (typically 0.1µF X7R) between BOOST and TS. These components form the floating high-side supply necessary to drive TG above TS, as detailed in the Applications Information section and Typical Application schematics.
How does the dual UVLO function in the LTC4440IMS8E#PBF?
The LTC4440IMS8E#PBF implements two independent UVLO circuits: one monitors VCC (threshold 6.2V falling), the other monitors BOOST–TS (threshold 6.9V falling). If either supply falls below its threshold, TG is actively pulled low to TS. When both are undervoltage, the device enters low-current mode drawing only ~25µA from VCC and ~86µA from BOOST.
Can the LTC4440IMS8E#PBF drive low-side MOSFETs?
Yes, the LTC4440IMS8E#PBF can drive low-side N-channel MOSFETs by connecting TS to GND and using TG as the gate output. Its 1.5Ω pull-down impedance and 2.4A pull-up current provide robust switching performance, though it lacks integrated low-side biasing features found in dedicated low-side drivers.
Is the exposed pad on the LTC4440IMS8E#PBF package electrically connected?
Yes, the exposed pad (Pin 9) on the LTC4440IMS8E#PBF MS8E package is electrically connected to GND and must be soldered to the PCB ground plane. Failure to do so increases thermal resistance beyond 40°C/W and degrades EMI performance - this requirement is explicitly stated in the datasheet Package Description and Applications Information sections.
LTC4440IMS8E#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- High-Side
- Channel Type:
- Single
- Number of Drivers:
- 1
- Gate Type:
- N-Channel MOSFET
- Voltage - Supply:
- 8V ~ 15V
- Logic Voltage - VIL, VIH:
- 1.3V, 1.6V
- Current - Peak Output (Source, Sink):
- 2.4A, 2.4A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- 80 V
- Rise / Fall Time (Typ):
- 10ns, 7ns
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC4440IMS8E#PBF FAQ
1.How can I place an order for LTC4440IMS8E#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4440IMS8E#PBF 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 LTC4440IMS8E#PBF reliable?
The price and inventory of LTC4440IMS8E#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4440IMS8E#PBF is usually 5 days.
3.What payment methods are accepted for LTC4440IMS8E#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4440IMS8E#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4440IMS8E#PBF?
LTC4440IMS8E#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4440IMS8E#PBF 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 LTC4440IMS8E#PBF?
For technical support, including LTC4440IMS8E#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4440IMS8E#PBF requirements.
6.How does Aetrix verify that LTC4440IMS8E#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4440IMS8E#PBF 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 LTC4440IMS8E#PBF meets industry standards.
7.What is the process for return or replacement of LTC4440IMS8E#PBF?
All LTC4440IMS8E#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4440IMS8E#PBF, 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 LTC4440IMS8E#PBF part is unused and in its original packaging.
Return procedure for LTC4440IMS8E#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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