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Analog Devices Inc. LTC4440AHMS8E-5#PBF
- Part No.:
- LTC4440AHMS8E-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Gate Drivers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC4440AHMS8E-5#PBF.pdf
- Description:
- IC GATE DRVR HIGH-SIDE 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:428
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Product details
Overview
LTC4440AHMS8E-5#PBF from Analog Devices (formerly Linear Technology) is a high-frequency, high-voltage, high-side N-channel MOSFET gate driver optimized for full-bridge and phase-modulated converters. It operates with VIN up to 80V (withstands 100V transients), delivers 1.1A peak pull-up current and 1.85Ω pull-down impedance at 6V BOOST–TS, and achieves 10ns rise / 7ns fall times driving 1nF loads - enabling efficient switching in telecom and server power supplies.
For engineers reviewing the LTC4440AHMS8E-5#PBF datasheet, LTC4440AHMS8E-5#PBF pinout, LTC4440AHMS8E-5#PBF application, or LTC4440AHMS8E-5#PBF equivalent, key selection criteria include its 150°C junction-rated MSOP-8 package, supply-independent TTL/CMOS input thresholds with 350mV hysteresis, undervoltage lockout (3.04V falling), and bootstrapped high-side drive capability up to 95V above ground.
Technical Context
The LTC4440AHMS8E-5#PBF uses a bipolar-NMOS hybrid output stage: an NPN transistor (Q1) for high-current pull-up and an NMOS (N1) for low-impedance pull-down, enabling fast transitions into capacitive gate loads. Its internal level shifter translates ground-referenced INP logic to the floating BOOST–TS domain without external isolation components.
It integrates undervoltage lockout on VCC (3.2V rising / 3.04V falling), supports bootstrap supply voltages from 4V to 15V, and features input thresholds (VIH = 1.55V typ, VIL = 1.25V typ) independent of VCC due to an internal regulator - ensuring robust noise immunity in high-dV/dt environments like isolated DC/DC converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Max (Continuous) | 80V - Enables use in 48V and 60V industrial/telecom input rails without derating. |
| VIN Max (Transient) | 100V for 100ms - Survives load-dump events in automotive-derived systems and unregulated front-end surges. |
| BOOST–TS Range | 4V to 15V - Supports standard logic-level FETs (e.g., 5V gate drive) and higher-voltage enhancement-mode devices. |
| Peak Pull-Up Current | 1.1A - Reduces MOSFET turn-on time and conduction losses in high-frequency (>500kHz) topologies. |
| Pull-Down Resistance | 1.85Ω - Ensures rapid gate discharge to prevent shoot-through in synchronous bridge configurations. |
| Rise/Fall Time (1nF) | 10ns / 7ns - Minimizes switching transition losses in high-power density designs. |
| UVLO Threshold | 3.04V (falling) - Prevents erratic operation during brown-out conditions by disabling TG output below safe drive voltage. |
Pinout & Package
The LTC4440AHMS8E-5#PBF is housed in an 8-lead plastic MSOP package with exposed thermal pad (Pin 9), requiring soldering to PCB ground for θJA = 40°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INP (Pin 1) | Logic Input | Ground-referenced TTL/CMOS-compatible signal; 350mV hysteresis prevents noise-induced false triggering. |
| GND (Pins 2, 4, 9) | Power & Thermal Ground | Multiple GND pins + exposed pad must be connected to low-inductance PCB ground plane for EMI control and thermal dissipation. |
| VCC (Pin 3) | Low-Side Supply | Powers internal logic and level shifter; requires local 1µF ceramic bypass to GND (Pin 2). |
| NC (Pin 5) | No Connect | Unbonded; may be tied to BOOST (Pin 6) for mechanical stability but carries no electrical function. |
| BOOST (Pin 6) | Bootstrap Supply Rail | Drives high-side output stage; connected via external capacitor to TS and diode from VCC - enables floating 95V swing above TS. |
| TG (Pin 7) | Gate Driver Output | High-current source/sink node swinging between TS and BOOST; directly drives MOSFET gate with minimal trace inductance required. |
| TS (Pin 8) | Top-Side Source Reference | Return path for high-side FET source; floats with drain voltage up to 80V - defines local ground for TG output swing. |
Key Features
| Feature | Design Value |
|---|---|
| Supply-Independent Input Thresholds | VIH = 1.55V, VIL = 1.25V (typ), hysteresis = 350mV - eliminates need for level-shifting circuitry and ensures reliable logic interpretation across VCC variation. |
| Bootstrapped High-Side Drive | Supports BOOST–TS up to 95V above ground - enables direct drive of high-side N-MOSFETs in buck, half-bridge, and full-bridge topologies without transformers or isolated supplies. |
| Thermally Enhanced MSOP-8 | Exposed pad (Pin 9) soldered to PCB ground achieves θJA = 40°C/W - sustains continuous operation at 150°C junction temperature in compact power modules. |
| Robust Transient Tolerance | Withstands 100V/100ms VIN transients - meets IEC 61000-4-4 surge immunity requirements for telecom and industrial power systems. |
| Integrated Undervoltage Lockout | Disables TG output when VCC falls below 3.04V - prevents partial turn-on and shoot-through faults during startup or fault recovery. |
Applications
| Telecom Power Supplies | Server Power Modules |
|---|---|
Use Scenario: Driving high-side MOSFETs in isolated full-bridge DC/DC converters for 48V intermediate bus distribution in base station RF power amplifiers. IC Role / Device Role / Timing Role: High-side gate driver synchronizing with controller (e.g., LTC3722-1) to enable zero-voltage switching and minimize switching losses at 200–500kHz. Use Value: 10ns/7ns rise/fall times reduce MOSFET transition losses by >30% vs. legacy drivers, improving efficiency in space-constrained 1U rack units. | Use Scenario: Controlling primary-side switches in 36–60V input, 12V/35A isolated full-bridge supplies for AI accelerator cards. IC Role / Device Role / Timing Role: High-voltage gate driver interfacing with phase-modulated PWM controller to manage dead-time and prevent shoot-through under dynamic load steps. Use Value: 1.1A peak pull-up and 1.85Ω pull-down ensure <100ns propagation delay matching, critical for maintaining tight timing margins in multi-phase systems. |
| Automotive Power Systems | Distributed Power Architectures |
Use Scenario: Driving high-side N-MOSFETs in 24V/48V battery-fed DC/DC converters for ADAS ECUs requiring load-dump resilience. IC Role / Device Role / Timing Role: Rugged gate driver handling 100V transients while delivering precise gate timing to maintain stable output regulation during cold-crank events. Use Value: Absolute max TS rating of 100V and UVLO hysteresis ensure fail-safe shutdown and clean restart after transient overvoltage events. | Use Scenario: Enabling modular, scalable power conversion in data center PDUs where multiple 12V outputs are derived from a common 48V bus. IC Role / Device Role / Timing Role: High-efficiency gate driver supporting high-frequency operation (>300kHz) to shrink magnetics and improve power density in distributed point-of-load converters. Use Value: Low quiescent current (200µA at VCC = 6V) and thermally optimized MSOP-8 package support fanless, sealed enclosure designs. |
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 |
|---|---|---|---|
| LM5109BMAX/NOPB | Lower max VIN (65V), no integrated UVLO hysteresis, 1.25A pull-up, 1.5Ω pull-down; SOIC-8 package. | Targeted at cost-sensitive industrial motor drives rather than telecom-grade transient resilience. | Choose LM5109BMAX/NOPB only if 65V max VIN suffices and thermal performance requirements are less stringent than 150°C junction. |
| UCC27531DR | Single-channel, 5A peak pull-up / 2.5A pull-down, 24V max VDD, no bootstrap support - requires external level shift or isolated supply. | Designed for low-side or isolated high-side drive using external gate drive transformers or optocouplers. | Select UCC27531DR when ultra-high peak current is needed and system architecture allows separate isolated bias supplies or transformer coupling. |
Compared with LM5109BMAX/NOPB and UCC27531DR, the LTC4440AHMS8E-5#PBF uniquely combines 80V continuous operation, 100V transient tolerance, integrated bootstrap level shifting, and 150°C rated packaging - making it the only option suitable for high-reliability, high-density telecom and server full-bridge converters without external isolation.
Availability
LTC4440AHMS8E-5#PBF is available at Aetrix Electronics and suitable for telecom power supplies, server power modules, and automotive DC/DC converters requiring stable component supply, long-term lifecycle support, and guaranteed extended temperature performance.
Supply support for LTC4440AHMS8E-5#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 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 LTC4440A family was designed specifically for high-voltage, high-frequency synchronous rectification and full-bridge gate driving in isolated DC/DC converters - emphasizing ruggedness, timing accuracy, and thermal reliability in telecom, server, and industrial power systems.
FAQ
What is the maximum continuous input voltage rating for the LTC4440AHMS8E-5#PBF?
The LTC4440AHMS8E-5#PBF has a maximum continuous TS voltage rating of 80V, meaning it can reliably drive high-side MOSFETs in circuits where the source node floats up to 80V above ground - such as in 48V and 60V telecom and server power supplies. This rating is confirmed in the Absolute Maximum Ratings table on page 2 of the official datasheet.
Does the LTC4440AHMS8E-5#PBF support bootstrap operation with a 12V BOOST–TS supply?
Yes, the LTC4440AHMS8E-5#PBF fully supports BOOST–TS voltages from 4V to 15V, including 12V. At 12V, it delivers improved gate overdrive for logic-level MOSFETs, reducing RDS(on) and conduction losses. Performance curves in Figure G04 (page 4) confirm stable VOH and VOL across this range.
How does the undervoltage lockout (UVLO) function in the LTC4440AHMS8E-5#PBF?
The LTC4440AHMS8E-5#PBF disables its TG output when VCC falls below 3.04V (falling threshold), pulling TG low to TS. This prevents partial turn-on of the driven MOSFET and avoids shoot-through faults. The UVLO hysteresis is 160mV, with rising threshold at 3.20V - specified in the Electrical Characteristics table on page 3.
What is the purpose of the exposed pad (Pin 9) on the LTC4440AHMS8E-5#PBF MSOP-8 package?
The exposed pad (Pin 9) on the LTC4440AHMS8E-5#PBF is electrically connected to GND and must be soldered to a PCB ground plane to achieve the rated thermal resistance of θJA = 40°C/W. Failure to do so increases thermal resistance significantly, risking junction temperature exceedance above the 150°C maximum - as explicitly stated in Note 4 (page 3) and Package Description (page 11).
Can the LTC4440AHMS8E-5#PBF drive both high-side and low-side N-MOSFETs?
Yes - while optimized for high-side drive via bootstrap, the LTC4440AHMS8E-5#PBF can also drive low-side N-MOSFETs by connecting TS to system ground. Its 1.1A pull-up and 1.85Ω pull-down provide strong turn-on/turn-off capability in either configuration, as confirmed in the Applications Information section (page 7) and Typical Application schematics (pages 9–10).
LTC4440AHMS8E-5#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:
- 4V ~ 15V
- Logic Voltage - VIL, VIH:
- 1.2V, 1.6V
- Current - Peak Output (Source, Sink):
- 1.1A, 1.1A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- 80 V
- Rise / Fall Time (Typ):
- 10ns, 7ns
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP-EP
LTC4440AHMS8E-5#PBF FAQ
1.How can I place an order for LTC4440AHMS8E-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4440AHMS8E-5#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 LTC4440AHMS8E-5#PBF reliable?
The price and inventory of LTC4440AHMS8E-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4440AHMS8E-5#PBF is usually 5 days.
3.What payment methods are accepted for LTC4440AHMS8E-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4440AHMS8E-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4440AHMS8E-5#PBF?
LTC4440AHMS8E-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4440AHMS8E-5#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 LTC4440AHMS8E-5#PBF?
For technical support, including LTC4440AHMS8E-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4440AHMS8E-5#PBF requirements.
6.How does Aetrix verify that LTC4440AHMS8E-5#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4440AHMS8E-5#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 LTC4440AHMS8E-5#PBF meets industry standards.
7.What is the process for return or replacement of LTC4440AHMS8E-5#PBF?
All LTC4440AHMS8E-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4440AHMS8E-5#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 LTC4440AHMS8E-5#PBF part is unused and in its original packaging.
Return procedure for LTC4440AHMS8E-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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