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Analog Devices Inc. LT4363IS-2#PBF
- Part No.:
- LT4363IS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363IS-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:435
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Product details
Overview
LT4363IS-2#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during overvoltage transients up to 150V, limits current via 50mV SNS–OUT sense threshold, and features adjustable UV/OV comparators, 0.5V TMR retry threshold, and auto-restart fault recovery. It is used in avionic power supplies requiring sustained operation under 80V surges.
For engineers reviewing the LT4363IS-2#PBF datasheet, LT4363IS-2#PBF pinout, LT4363IS-2#PBF application, or LT4363IS-2#PBF equivalent, key selection considerations include its 4V–80V operating range, 1.275V UV/OV thresholds, 7µA shutdown current, 1.375V fault turn-off threshold, and SO-16 package compatibility with industrial hot-swap systems.
Technical Context
The LT4363IS-2#PBF implements dual-fault protection using independent overvoltage (regulated via FB servo loop) and overcurrent (controlled by SNS–OUT differential amplifier) detection paths. Its TMR pin uses VCC–OUT–dependent current sources-scaling from 4µA to 50µA for OV and 8µA to 260µA for OC-to dynamically adjust timer duration based on MOSFET stress.
Unlike the latch-off LT4363-1 variant, the LT4363IS-2#PBF integrates auto-restart logic: after TMR discharges to 0.5V during cool-down, GATE re-enables automatically unless OV > 1.275V, preventing oscillation during sustained overvoltage. The SO-16 package supports 125°C junction temperature and includes dedicated UV, OV, SHDN, FLT, and ENOUT pins for system-level coordination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input - enables direct use in 12V/24V/48V industrial and avionic rails without pre-regulation. |
| Output Clamp Regulation | Adjustable via FB divider - maintains precise 1.275V reference at FB to set output clamp voltage (e.g., 27V as shown in typical application). |
| Current Limit Threshold | 50mV SNS–OUT differential - sets accurate current limit (e.g., 5A with 10mΩ sense resistor), reduced to 25mV if OUT < 2V for short-circuit protection. |
| Fault Timer Thresholds | TMR = 1.275V (FLT warning), 1.375V (MOSFET turn-off), 0.5V (auto-restart for -2 version) - enables programmable ride-through and safe cool-down timing. |
| UV/OV Comparator Thresholds | 1.275V ±12mV UV, 1.275V ±7.5mV OV - provides precise supply monitoring with hysteresis to prevent chatter during brown-in/brown-out transitions. |
| Shutdown Current | <7µA at SHDN ≤ 0.4V - allows ultra-low-power system sleep modes without compromising surge readiness. |
| Package | 16-Lead Plastic SO - industry-standard footprint with 80°C/W θJA, compatible with automated assembly and thermal vias for high-power dissipation. |
Pinout & Package
LT4363IS-2#PBF is housed in a 16-lead plastic SO package (S package), with exposed thermal pad not present. Pin 1 is bottom-left corner when notch faces up; pin numbering proceeds counterclockwise. Thermal resistance θJA = 80°C/W supports continuous operation at full load with standard PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Output voltage sense input | Connects to MOSFET source; establishes VCC–OUT differential used by TMR timer and ENOUT enable logic. |
| SNS | Current sense input | Monitors voltage drop across external sense resistor; drives current-limit amplifier to clamp ΔVSNS at 50mV. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output with 14V clamp; pulls up to ~13V above OUT to fully enhance external N-channel MOSFET. |
| VCC | Main supply input | Accepts 4V–80V; withstands –60V reverse bias; powers internal circuitry and charge pump. |
| SHDN | Shutdown control input | Pulled low (<0.4V) to enter 7µA shutdown; tolerates –60V to +100V; open or pulled ≥2.1V for normal operation. |
| FB | Feedback input for OV regulation | 1.275V precision reference point; connects to resistive divider from OUT to GND to set output clamp voltage. |
| TMR | Fault timer capacitor connection | Capacitor to GND sets timing for FLT warning, MOSFET turn-off, and auto-restart; current scales with VCC–OUT. |
| ENOUT | Open-collector enable output | High-impedance when OUT ≥ VCC–0.5V and ≥3V; sinks up to 2mA; signals MOSFET fully on state. |
| FLT | Open-collector fault output | Pulls low when TMR ≥ 1.275V; latched until reset or auto-restart; sinks up to 2mA for system fault signaling. |
| UV | Undervoltage comparator input | Below 1.275V disables GATE; hysteresis prevents oscillation; connect to VCC if unused. |
| OV | Overvoltage comparator input (LT4363-2 only) | Above 1.275V inhibits auto-restart; ensures MOSFET remains off during sustained overvoltage; connect to GND if unused. |
| GND | Device ground reference | Common return for all analog and digital blocks; must be low-impedance path to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-restart fault recovery | LT4363IS-2#PBF automatically re-enables GATE after TMR cools to 0.5V - eliminates manual reset in transient-prone environments like vehicle battery systems. |
| VDS-dependent fault timing | TMR charging current scales with VCC–OUT (4–50µA for OV, 8–260µA for OC) - dynamically adapts timer duration to MOSFET safe operating area (SOA). |
| Reverse input protection support | SHDN, UV, OV pins tolerate –60V; enables back-to-back N-MOSFET configuration replacing Schottky diodes - reduces forward drop and power loss by >50%. |
| Precision 1.275V reference | FB, UV, and OV inputs share same trimmed bandgap reference - ensures consistent 1.275V ±12mV thresholds across temperature and supply variations. |
| Low-quiescent shutdown | 7µA ICC(SHDN) at SHDN ≤ 0.4V - extends battery life in always-on avionic subsystems without sacrificing surge response readiness. |
Applications
| Avionic Power Protection | Industrial Hot-Swap Systems |
|---|---|
Use Scenario: Aircraft 28V DC distribution bus subjected to load dump transients exceeding 100V. IC Role / Device Role / Timing Role: LT4363IS-2#PBF regulates output to 27V during surge, monitors SNS–OUT for overcurrent, and restarts after cool-down to maintain flight-critical loads. Use Value: Enables uninterrupted operation of navigation and comms modules during MIL-STD-704F Category A/B surges without manual intervention. |
Use Scenario: Modular PLC backplane where cards are inserted live into powered chassis. IC Role / Device Role / Timing Role: LT4363IS-2#PBF controls series N-MOSFET to limit inrush current and clamp supply spikes during card insertion. Use Value: Prevents bus voltage sag and downstream damage while supporting automatic recovery after brief overloads. |
| Battery-Powered High-Side Switch | Intrinsic Safety Barriers |
Use Scenario: Ruggedized handheld test equipment powered by Li-ion packs with variable voltage (3.0–4.2V/cell). IC Role / Device Role / Timing Role: LT4363IS-2#PBF acts as high-side switch with UV lockout below 4V and OV protection against charger faults. Use Value: Ensures clean power sequencing and prevents unsafe battery discharge or overcharge conditions in field-deployed tools. |
Use Scenario: Hazardous-area sensor interface requiring energy limiting per IEC 60079-11. IC Role / Device Role / Timing Role: LT4363IS-2#PBF limits fault energy by clamping output voltage and shutting off within microseconds during short circuits. Use Value: Meets entity parameter requirements for ia/ib classification by restricting fault power to safe levels without external Zener barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363HS-2#PBF | Same functionality and pinout; rated for –40°C to 125°C junction temperature vs. –40°C to 85°C for LT4363IS-2#PBF. | Required for extended-temperature avionics or under-hood automotive deployments where ambient exceeds 85°C. | Select LT4363HS-2#PBF when operating junction temperature may exceed 85°C; otherwise LT4363IS-2#PBF meets standard industrial specs. |
| LT4363IMS-2#PBF | Identical electrical specs; packaged in 12-lead MSOP (3mm × 4mm) instead of SO-16 - smaller footprint but higher θJA (135°C/W). | Suitable for space-constrained portable electronics where board area is critical and thermal management permits higher junction rise. | Choose LT4363IMS-2#PBF for compact designs with adequate copper pour; retain LT4363IS-2#PBF for higher-power or thermally demanding SO-16 layouts. |
Compared with LT4363HS-2#PBF and LT4363IMS-2#PBF, the LT4363IS-2#PBF offers optimal balance of industrial temperature range, proven SO-16 thermal performance, and broad design reuse across legacy schematics - making it the default choice for new 85°C-rated systems.
Availability
LT4363IS-2#PBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap systems, and battery-powered high-side switching requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT4363IS-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LT4363 product line delivers robust front-end protection for DC power systems, designed specifically for mission-critical applications needing reliable surge suppression, precise current limiting, and intelligent fault recovery - such as aircraft power distribution and industrial PLCs.
FAQ
What is the maximum input voltage the LT4363IS-2#PBF can withstand without damage?
The LT4363IS-2#PBF has an absolute maximum VCC rating of 100V and can withstand transient surges up to 150V in regulated operation. Its pins (VCC, SHDN, UV, OV) tolerate –60V to +100V, enabling robust reverse-battery and load-dump protection. Permanent damage occurs only beyond these limits - confirmed in Absolute Maximum Ratings table on page 2 of the datasheet.
How does the LT4363IS-2#PBF differ from the LT4363IS-1#PBF in fault behavior?
The LT4363IS-2#PBF implements auto-restart: after fault turn-off, it automatically re-enables the GATE pin once the TMR capacitor discharges to 0.5V. In contrast, the LT4363IS-1#PBF latches off permanently until manually reset via SHDN pulse. This makes LT4363IS-2#PBF ideal for unattended systems where transient recovery must occur without host intervention.
Can the LT4363IS-2#PBF be used with P-channel MOSFETs?
No - the LT4363IS-2#PBF is designed exclusively for N-channel MOSFETs, with GATE drive referenced to OUT and capable of pulling up to ~13V above OUT. Driving a P-channel device would require high-side gate drive referenced to VCC, which the LT4363IS-2#PBF does not support. Use dedicated P-channel controllers (e.g., LTC4412) for that topology.
What is the purpose of the OV pin on the LT4363IS-2#PBF, and how should it be configured?
The OV pin on the LT4363IS-2#PBF disables auto-restart when held above 1.275V, preventing oscillation during sustained overvoltage. It must be connected to a resistive divider from VCC to GND to monitor input voltage. If unused, tie OV directly to GND - leaving it floating may cause unpredictable restart inhibition due to noise coupling.
Does the LT4363IS-2#PBF provide reverse polarity protection out-of-the-box?
The LT4363IS-2#PBF itself does not block reverse current, but enables robust reverse-input protection by supporting back-to-back N-MOSFET configurations. With two N-MOSFETs oriented source-to-source, the LT4363IS-2#PBF controls the high-side device while the body diode of the low-side device blocks reverse current - eliminating Schottky losses and achieving <100mV drop versus >300mV for diodes.
LT4363IS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT4363IS-2#PBF FAQ
1.How can I place an order for LT4363IS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363IS-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 LT4363IS-2#PBF reliable?
The price and inventory of LT4363IS-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 LT4363IS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363IS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363IS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363IS-2#PBF?
LT4363IS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363IS-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 LT4363IS-2#PBF?
For technical support, including LT4363IS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363IS-2#PBF requirements.
6.How does Aetrix verify that LT4363IS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363IS-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 LT4363IS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363IS-2#PBF?
All LT4363IS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363IS-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 LT4363IS-2#PBF part is unused and in its original packaging.
Return procedure for LT4363IS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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