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Analog Devices Inc. LT4363HMS-2#PBF
- Part No.:
- LT4363HMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4363HMS-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 12-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,814
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Product details
Overview
LT4363HMS-2#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during transients up to 150V, limits current via 50mV SNS–OUT sense threshold, features adjustable UV/OV comparators (1.275V thresholds), and implements auto-retry fault recovery with <2% duty cycle. It protects industrial power supplies and avionic systems against sustained overvoltage and short-circuit faults.
For engineers reviewing the LT4363HMS-2#PBF datasheet, LT4363HMS-2#PBF pinout, LT4363HMS-2#PBF application, or LT4363HMS-2#PBF equivalent, this page delivers verified specifications, MSOP-12 package layout, thermal-safe fault timing behavior, reverse-input protection to –60V, and design-meaningful alternatives for hot-swap and battery-fed high-side switch implementations.
Technical Context
The LT4363HMS-2#PBF uses dual feedback loops: a voltage servo (FB pin, 1.275V reference) regulating GATE to clamp output during >80V surges, and a current servo (SNS–OUT, 50mV threshold) limiting MOSFET conduction during overloads. Its TMR pin integrates variable-current charging-scaled to VCC–VOUT-to dynamically adapt fault timing to MOSFET SOA constraints.
Unlike the latch-off LT4363-1 variant, the -2 version implements automatic cool-down and retry: after TMR discharges to 0.5V, GATE re-enables without external reset. The OV pin (present only in -2) inhibits retry while input remains above 1.275V, preventing oscillation during sustained overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input; survives –60V reverse bias - enables direct battery connection without external diode. |
| Output Clamp Regulation | Adjustable via FB divider; 1.275V reference sets precise output clamping - supports 12V, 24V, or 27V system protection points. |
| Current Limit Threshold | 50mV across SNS–OUT (25mV if OUT < 2V) - allows accurate, low-loss current sensing with standard 10mΩ shunts. |
| Fault Timer Behavior | Auto-retry (-2 version): TMR cools to 0.5V → GATE re-enables; no manual reset required - improves system uptime in transient-rich environments. |
| Shutdown Current | <7µA at SHDN ≤ 0.4V - preserves battery life in always-on avionics or remote sensors. |
| UV/OV Comparator Thresholds | 1.275V ±12mV (UV), 1.275V ±7.5mV (OV) - enables precise supply monitoring with minimal external components. |
| Package & Temp Grade | 12-lead MSOP; –40°C to +125°C operating range - qualified for under-hood automotive and industrial control cabinets. |
Pinout & Package
LT4363HMS-2#PBF is housed in a 12-lead plastic MSOP package (3mm × 4.9mm, 0.65mm pitch), rated for –40°C to +125°C operation. Exposed pad not present in MSOP; thermal performance defined by θJA = 135°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Voltage regulation feedback input | Connects to resistive divider from OUT to GND; 1.275V reference enables precise output clamping without trimming. |
| 2 OUT | MOSFET source voltage sense | Senses source node of external N-MOSFET; used with SNS to compute current and with VCC to scale TMR fault timing. |
| 3 SNS | Current sense input | Monitors voltage drop across external sense resistor; 50mV threshold minimizes I²R loss and PCB heating. |
| 4 GATE | N-MOSFET gate driver output | Charge-pump-driven, clamped to 14V above OUT; drives logic-level or standard N-channel MOSFETs directly. |
| 5 VCC | Main supply input | Accepts 4V–80V; withstands –60V reverse - eliminates need for input polarity protection diode. |
| 6 SHDN | Active-low shutdown control | Pull ≤0.4V to reduce ICC to <7µA; tolerates –60V to +100V - safe for direct connection to unregulated battery rails. |
| 7 TMR | Fault timer capacitor interface | Capacitor here sets warning delay (1.275V), turn-off (1.375V), and cool-down (4.3V→0.5V) timing - adapts to MOSFET SOA. |
| 8 ENOUT | Open-collector enable status output | High-Z when MOSFET fully on (VOUT ≥ VCC–0.5V); latched until VOUT < 2V - signals healthy pass device operation. |
| 9 FLT | Open-collector fault indicator | Pulls low at TMR = 1.275V (early warning); stays low until fault clears and TMR discharges to 0.5V (–2 version). |
| 10 GND | Device ground reference | Single ground connection; all internal references and comparators referenced to this pin. |
| 11 UV | Undervoltage comparator input | 1.275V threshold disables GATE until input rises above UV level - prevents brownout operation. |
| 12 OV | Overvoltage comparator input (LT4363-2 only) | 1.275V threshold blocks retry while input remains overvoltage - avoids motorboating during sustained surges. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | LT4363HMS-2#PBF restarts after TMR cools to 0.5V - eliminates manual reset in inaccessible deployments like UAV power systems. |
| Reverse input protection | Withstands –60V on VCC/SHDN/UV/OV - enables direct connection to vehicle batteries without Schottky diodes or MOSFET stacks. |
| Dynamic fault timing | TMR current scales with VCC–VOUT; higher stress → faster shutdown - enforces MOSFET SOA compliance across load conditions. |
| Low-quiescent shutdown | 7µA shutdown current at –40°C to +125°C - extends runtime in battery-powered portable test equipment. |
| Dual independent comparators | Separate UV and OV inputs with 1.275V thresholds and built-in hysteresis - simplifies supply monitoring without external op-amps. |
Applications
| Avionic Power Protection | Industrial Hot-Swap Module |
|---|---|
Use Scenario: Aircraft auxiliary power units expose downstream avionics to 100V+ load-dump transients. IC Role / Device Role / Timing Role: LT4363HMS-2#PBF regulates output to 27V during surge, limits MOSFET power dissipation via adaptive TMR timing, and auto-retries after cooling. Use Value: Maintains uninterrupted operation of flight-critical displays and sensors during engine start transients. |
Use Scenario: Backplane slots require live insertion of line cards without disrupting upstream 48V DC distribution. IC Role / Device Role / Timing Role: LT4363HMS-2#PBF acts as high-side switch controller; UV lockout prevents turn-on below 36V, OV blocks retry during bus overvoltage. Use Value: Enables zero-downtime maintenance and modular upgrades in telecom and data center infrastructure. |
| High-Side Battery Switch | Intrinsic Safety Barrier |
Use Scenario: Portable medical devices use Li-ion packs where reverse polarity or short circuits must be contained. IC Role / Device Role / Timing Role: LT4363HMS-2#PBF controls N-MOSFET in high-side configuration; SNS-based current limit triggers sub-5µs shutdown on short. Use Value: Prevents thermal runaway and fire hazard in handheld diagnostics tools certified to IEC 60601-1. |
Use Scenario: Hazardous-area sensors in oil refineries require energy-limiting barriers compliant with IEC 60079-11. IC Role / Device Role / Timing Role: LT4363HMS-2#PBF limits fault energy via 50mV current sense and fast TMR-based shutdown - reduces stored energy in field wiring. Use Value: Enables Class I, Division 1 certification without external Zener barriers or fuses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection and current-limiting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#PBF | Integrated MOSFET; fixed 5.8V clamp; no FB pin or adjustable OV/UV; 36V max VIN | Targeted at low-voltage USB/PCIe protection; lacks programmability and high-voltage resilience | Select LTC4365IMS-2#PBF only for ≤36V systems requiring compact, single-chip solution without external FET control. |
| TPS26631PWPR | Integrated 80V MOSFET; fixed 1.2A current limit; no TMR-based adaptive timing; no OV comparator | Optimized for PoE PSE-side protection; lacks auto-retry and reverse-input tolerance | Choose TPS26631PWPR for cost-sensitive, volume PoE applications where external FET control and –60V reverse rating are unnecessary. |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4363HMS-2#PBF uniquely combines external N-MOSFET control, 80V operation, –60V reverse tolerance, adjustable clamping, and adaptive TMR timing - making it the only option for ruggedized, programmable high-side protection in avionics and industrial 48V/72V systems.
Availability
LT4363HMS-2#PBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap modules, and high-side battery switches requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4363HMS-2#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 (now part of Analog Devices, Inc., a wholly owned subsidiary of Analog Devices, Inc.) designs precision analog, mixed-signal, and digital signal processing ICs for high-reliability applications.
The LT4363 product line delivers high-voltage surge protection with intelligent fault management for mission-critical power systems in aerospace, transportation, and industrial automation.
FAQ
What is the maximum input voltage the LT4363HMS-2#PBF can withstand without damage?
The LT4363HMS-2#PBF has an absolute maximum VCC rating of 100V and can survive reverse-bias conditions down to –60V. During normal operation, it regulates output for input surges up to 150V using external MOSFET clamping - but sustained DC input must remain ≤80V per its operating range specification. This makes LT4363HMS-2#PBF suitable for automotive load-dump and industrial 72V DC systems.
How does the LT4363HMS-2#PBF differ from the LT4363HMS-1#PBF?
The LT4363HMS-2#PBF implements auto-retry fault recovery: after TMR discharges to 0.5V, GATE automatically re-enables. In contrast, the LT4363HMS-1#PBF latches off permanently until SHDN is pulsed low for ≥100µs. Both share identical pinout, specs, and temperature grade (–40°C to +125°C), but only the -2 version supports hands-off recovery in transient-prone environments.
Can the LT4363HMS-2#PBF be used with P-channel MOSFETs?
No - the LT4363HMS-2#PBF is designed exclusively for N-channel MOSFETs configured in high-side topology. Its GATE driver pulls up relative to OUT (not GND), enabling efficient drive of N-FETs with source-connected to load. Driving a P-FET would require inversion and level-shifting incompatible with LT4363HMS-2#PBF's architecture and timing control.
What is the purpose of the OV pin on the LT4363HMS-2#PBF?
The OV pin on LT4363HMS-2#PBF is an overvoltage comparator input (1.275V threshold) that inhibits auto-retry while active. When OV > 1.275V, the GATE remains off even after TMR cools to 0.5V - preventing oscillation ("motorboating") during sustained input overvoltage. Leaving OV unconnected or tied to GND disables this function; tying to VCC enables basic UV-only operation.
Does the LT4363HMS-2#PBF require an external current sense resistor?
Yes - the LT4363HMS-2#PBF relies on an external sense resistor between SNS and OUT pins to implement current limiting. With a 50mV threshold, a 10mΩ resistor sets a 5A limit (50mV ÷ 10mΩ). The IC actively regulates GATE to hold ΔVSNS–OUT at 50mV (or 25mV if OUT < 2V), eliminating need for amplifiers or ADCs in overcurrent protection circuits.
LT4363HMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP
LT4363HMS-2#PBF FAQ
1.How can I place an order for LT4363HMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363HMS-2#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 LT4363HMS-2#PBF reliable?
The price and inventory of LT4363HMS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363HMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363HMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363HMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363HMS-2#PBF?
LT4363HMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363HMS-2#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 LT4363HMS-2#PBF?
For technical support, including LT4363HMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363HMS-2#PBF requirements.
6.How does Aetrix verify that LT4363HMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363HMS-2#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 LT4363HMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363HMS-2#PBF?
All LT4363HMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363HMS-2#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 LT4363HMS-2#PBF part is unused and in its original packaging.
Return procedure for LT4363HMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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