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Analog Devices Inc. LT4363MPS-2#PBF
- Part No.:
- LT4363MPS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363MPS-2#PBF.pdf
- Description:
- IC SURGE STOPPER HV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:131
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Product details
Overview
LT4363MPS-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, limit current via 50mV SNS–OUT sense threshold, and provide reverse input protection down to –60V. It features adjustable UV/OV comparators, 125°C extended temperature rating, and automatic retry after fault cool-down - used in avionic power rails and industrial hot-swap systems.
For engineers reviewing the LT4363MPS-2#PBF datasheet, LT4363MPS-2#PBF pinout, LT4363MPS-2#PBF application, or LT4363MPS-2#PBF equivalent, key selection criteria include its 4V–80V operating range, 7µA shutdown current, 1.275V FB reference, TMR-based adaptive fault timing, and SO-16 package with –55°C to 125°C operation.
Technical Context
The LT4363MPS-2#PBF implements dual-fault protection using independent voltage and current regulation loops: an internal amplifier maintains 1.275V at FB during overvoltage by modulating GATE, while a precision current-sense amplifier limits ΔVSNS to 50mV (25mV when OUT < 2V). Its TMR pin uses VCC–OUT–dependent charging currents - 4–50µA for overvoltage, 8–260µA for overcurrent - enabling MOSFET SOA-aware timing.
Unlike the latch-off LT4363-1 variant, the LT4363-2 version integrates automatic restart logic: after TMR discharges to 0.5V during cool-down, GATE pulls high without external reset. The OV pin (present only in -2 variants) inhibits retry if >1.275V, preventing oscillation under sustained overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input supply; supports –60V reverse input without damage. |
| Output Clamp Regulation | Adjustable via FB divider; 1.275V reference enables precise output clamping (e.g., 27V as shown in typical application). |
| Current Limit Threshold | 50mV across SNS–OUT (reduced to 25mV when OUT < 2V), enabling accurate, low-loss load current limiting. |
| Fault Timer Behavior | TMR capacitor sets warning (1.275V), turn-off (1.375V), and cool-down (4.3V→0.5V) thresholds; LT4363-2 auto-restarts at 0.5V. |
| UV/OV Comparator Thresholds | 1.275V ±12mV (UV) and 1.275V ±7.5mV (OV); hysteresis prevents chatter during threshold crossings. |
| Shutdown Current | <7µA at SHDN = 0V, enabling ultra-low-power system-level power gating. |
| Package & Temp Grade | 16-pin SO package; MP-grade rated for –55°C to +125°C junction temperature. |
Pinout & Package
LT4363MPS-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. The device operates with GND referenced to exposed pad in DFN/MSOP variants, but SO variant has no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Output voltage sense input | Senses source of external N-MOSFET; used with SNS to measure current and determine VDS for adaptive TMR timing. |
| SNS | Current sense input | Connects to high-side of current sense resistor; ΔVSNS regulated to 50mV (25mV under severe short) for precise current limiting. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output pulled up to ~13V above OUT; clamped at 14V to protect MOSFET gate oxide. |
| VCC | Main supply input | Accepts 4V–80V; withstands –60V reverse bias; powers internal circuitry and charge pump. |
| SHDN | Shutdown control input | Pulled below 0.4V to enter 7µA shutdown; tolerates –60V to +100V, enabling robust system-level control. |
| FB | Feedback input for OV clamp | 1.275V internal 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 cool-down; voltage thresholds define state transitions. |
| ENOUT | Enable output indicator | Open-collector output goes high-Z when OUT is within 0.5V of VCC and >3V above GND, signaling full MOSFET conduction. |
| FLT | Fault indicator output | Open-collector output pulls low at TMR = 1.275V (warning) and remains low until fault clears and TMR drops to 0.5V (LT4363-2). |
| UV | Undervoltage comparator input | Keeps GATE off until UV > 1.275V; hysteresis prevents oscillation during brown-out recovery. |
| OV | Overvoltage comparator input | Prevents retry while OV > 1.275V; ensures MOSFET stays off during sustained overvoltage (LT4363-2 only). |
| GND | Device ground reference | Primary return path for internal amplifiers, comparators, and logic; ties to system ground plane. |
| NC | No-connect pins | Pins 3, 5, 9, and 11 are internally unused; must be left floating or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Fault Timing | TMR charging current scales with VCC–OUT (4–50µA for OV, 8–260µA for OC), dynamically matching MOSFET SOA and preventing thermal runaway. |
| Auto-Restart After Fault | LT4363-2 variant automatically re-enables GATE after TMR cools to 0.5V, eliminating need for manual reset in transient-prone environments. |
| Reverse Input Protection | Withstands –60V on VCC and SHDN pins; enables back-to-back N-MOSFET configuration to replace Schottky diodes, reducing forward drop and power loss. |
| Precision Dual Threshold Sensing | UV and OV comparators with 1.275V trip points and factory-trimmed hysteresis (12mV UV, 7.5mV OV) ensure stable operation during supply fluctuations. |
| Low-Power Shutdown | 7µA quiescent current in shutdown mode (SHDN ≤ 0.4V) supports battery-backed or energy-sensitive applications without compromising protection. |
Applications
| Avionic Power Distribution | Industrial Hot-Swap Systems |
|---|---|
Use Scenario: Protecting flight-critical avionics from 100V+ load dump transients in MIL-STD-704F-compliant 28V DC systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V during 80V surges; TMR-based timing ensures MOSFET stays within SOA during 100ms transients. Use Value: Enables uninterrupted operation of navigation and comms modules during engine start transients, meeting DO-160 Section 22 surge immunity requirements. | Use Scenario: Safely inserting/replacing line cards in telecom chassis with live backplane voltage (–48V or +48V). IC Role / Device Role / Timing Role: Controls high-side N-MOSFET to limit inrush and fault current; UV lockout prevents turn-on until backplane stabilizes. Use Value: Eliminates need for mechanical interlocks or complex sequencing; reduces insertion arc energy and PCB footprint vs discrete solutions. |
| Intrinsic Safety Barriers | Battery-Powered High-Side Switching |
Use Scenario: Isolating hazardous-area sensors in petrochemical plants using intrinsically safe (IS) barriers compliant with IEC 60079-11. IC Role / Device Role / Timing Role: Limits fault energy delivered to field devices via precise 50mV current sensing and sub-5µs overcurrent response. Use Value: Ensures fault energy remains below ignition thresholds (<60mJ) even during shorted sensor wiring, enabling Class I Div 1 certification. | Use Scenario: Managing 24V/48V battery loads in mobile equipment (e.g., construction machinery, AGVs) where reverse polarity and load dumps occur. IC Role / Device Role / Timing Role: High-side switch with –60V reverse input tolerance and 150V surge protection; SHDN enables microcontroller-controlled power gating. Use Value: Replaces bulky relays and discrete protection circuits; reduces BOM count and improves reliability in vibration-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#PBF | Lower 4.5V–40V operating range; integrated MOSFET; fixed 28V clamp; no FB pin for adjustment. | Best suited for compact 12V/24V systems where board space is constrained and adjustable clamp not required. | Select LTC4365IMS-2#PBF when integrated FET and smaller MSOP package outweigh need for 80V operation or programmable clamping. |
| TPS26631PWPR | 4.5V–60V range; fixed 36V overvoltage clamp; no TMR-based adaptive timing; lower 1.5A continuous current rating. | Targeted at USB PD and industrial IoT edge nodes requiring basic OVP with minimal external components. | Choose TPS26631PWPR for cost-sensitive, lower-power applications where TI's ecosystem support and simplified layout are priorities. |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4363MPS-2#PBF offers wider 4V–80V operation, user-adjustable output clamping via FB, and adaptive TMR timing that scales with MOSFET stress - making it uniquely suitable for high-reliability avionics and harsh-environment industrial systems.
Availability
LT4363MPS-2#PBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap systems, intrinsic safety barriers, and battery-powered high-side switching requiring stable component supply across extended temperature and high-surge environments.
Supply support for LT4363MPS-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 high-performance analog, mixed-signal, and digital signal processing ICs for precision, power, and reliability-critical applications.
The LT4363 product line delivers high-voltage surge protection and current limiting for mission-critical power systems, targeting avionics, industrial automation, and transportation where survivability under extreme electrical stress is mandatory.
FAQ
What is the maximum input voltage the LT4363MPS-2#PBF can withstand without damage?
The LT4363MPS-2#PBF has an absolute maximum VCC rating of 100V and can safely withstand input surges up to 150V in typical application configurations with proper external clamping. Its –60V to +100V tolerance on VCC, SHDN, UV, and OV pins enables robust reverse-polarity and load-dump resilience. This rating is validated per Analog Devices' Absolute Maximum Ratings table and applies across the full –55°C to +125°C operating range of the LT4363MPS-2#PBF.
How does the LT4363MPS-2#PBF differ from the LT4363-1 version?
The LT4363MPS-2#PBF implements automatic retry after fault cool-down: once the TMR pin discharges to 0.5V, GATE pulls high without external intervention. In contrast, the LT4363-1 latches off permanently until SHDN is pulsed low for ≥100µs. The LT4363MPS-2#PBF also includes the OV pin to inhibit retry during sustained overvoltage - a feature absent in LT4363-1 variants.
Can the LT4363MPS-2#PBF be used with P-channel MOSFETs?
No, the LT4363MPS-2#PBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver is optimized to pull up relative to the OUT pin (source), requiring the MOSFET source to connect to the load side. Driving a P-channel device would require inversion logic and incompatible gate voltage referencing, which the LT4363MPS-2#PBF does not support.
What is the purpose of the ENOUT pin on the LT4363MPS-2#PBF?
The ENOUT pin on the LT4363MPS-2#PBF is an open-collector enable indicator that goes into high-impedance state when the external MOSFET is fully enhanced - specifically when OUT is within 0.5V of VCC and ≥3V above GND. It provides system-level confirmation of healthy conduction, useful for status monitoring or cascading enable signals in multi-rail power architectures using the LT4363MPS-2#PBF.
Does the LT4363MPS-2#PBF require an external current sense resistor?
Yes, the LT4363MPS-2#PBF requires an external current sense resistor connected between the SNS and OUT pins. The IC regulates the voltage across this resistor to 50mV (or 25mV during severe shorts), enabling precise current limiting. Typical values range from 10mΩ to 100mΩ depending on desired current threshold; the resistor must handle peak power during fault conditions and be placed close to the MOSFET source to minimize noise coupling in the LT4363MPS-2#PBF circuit.
LT4363MPS-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
LT4363MPS-2#PBF FAQ
1.How can I place an order for LT4363MPS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363MPS-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 LT4363MPS-2#PBF reliable?
The price and inventory of LT4363MPS-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 LT4363MPS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4363MPS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363MPS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363MPS-2#PBF?
LT4363MPS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363MPS-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 LT4363MPS-2#PBF?
For technical support, including LT4363MPS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363MPS-2#PBF requirements.
6.How does Aetrix verify that LT4363MPS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363MPS-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 LT4363MPS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4363MPS-2#PBF?
All LT4363MPS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363MPS-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 LT4363MPS-2#PBF part is unused and in its original packaging.
Return procedure for LT4363MPS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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