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Analog Devices Inc. LT4363MPS-1#TRPBF
- Part No.:
- LT4363MPS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363MPS-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,914
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Product details
Overview
LT4363MPS-1#TRPBF 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 100V, provides adjustable 27V overvoltage clamping, fast 1µs overcurrent limiting (50mV sense threshold), and latched fault shutdown. It operates from 4V to 80V input, supports –60V reverse input protection, and is qualified for –55°C to 125°C industrial/military applications.
For engineers reviewing the LT4363MPS-1#TRPBF datasheet, LT4363MPS-1#TRPBF pinout, LT4363MPS-1#TRPBF application, or LT4363MPS-1#TRPBF equivalent, this page delivers verified specifications, SO-16 package layout, UV/OV comparator thresholds, fault timer behavior, and real-world surge protection design context - all confirmed against Analog Devices' official Rev. C datasheet and ordering information.
Technical Context
The LT4363MPS-1#TRPBF implements dual-fault protection via independent voltage and current regulation loops: an internal amplifier maintains 1.275V at FB during overvoltage, while a precision current-sense amplifier limits ΔVSNS to 50mV (25mV below 2V OUT). Its TMR pin uses VCC–OUT–dependent current sourcing (4–50µA for OV, 8–260µA for OC) to dynamically scale fault timing per MOSFET safe operating area.
It features latch-off behavior (LT4363-1 variant): FLT pulls low at VTMR = 1.275V, GATE shuts off at VTMR = 1.375V, and remains latched until SHDN is pulsed low ≥100µs. The SO-16 package includes dedicated UV, FB, SNS, GATE, and ENOUT pins with ±60V-rated SHDN/UV/OV inputs and 14V GATE clamp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V continuous operation; withstands –60V reverse input without damage. |
| Overvoltage Clamp | Adjustable 27V output regulation during surge; set via FB resistive divider referencing 1.275V internal reference. |
| Current Limit Threshold | 50mV ΔVSNS (SNS–OUT) for normal operation; reduces to 25mV when OUT < 2V to limit MOSFET stress during hard shorts. |
| Fault Response Speed | ≤1µs overcurrent turn-off propagation delay; ≤1ns overvoltage turn-off propagation delay. |
| Shutdown Current | <7µA quiescent current when SHDN ≤ 0.4V - enables ultra-low-power system standby. |
| Operating Temperature | –55°C to +125°C (MP grade), qualified for avionics, rail, and harsh industrial environments. |
| Package | 16-pin plastic SO (S package), exposed pad not present; pin-compatible with LT4363CS-1/HS-1/IS-1 variants. |
Pinout & Package
LT4363MPS-1#TRPBF is housed in a 16-lead plastic SO package (S package), with 12 functional pins and 4 NC (no-connect) terminals. The package has θJA = 80°C/W and supports lead-free reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Output voltage sense input | Senses source voltage of external N-MOSFET; used with SNS to measure current and determine VCC–OUT for dynamic TMR timing. |
| SNS | Current sense input | Connects to high-side of current sense resistor; internal amplifier regulates ΔVSNS to 50mV (or 25mV) to enforce precise current limiting. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output with 14V clamp; pulls up to 13V above OUT to fully enhance standard logic-level N-MOSFETs. |
| VCC | Main supply input | Accepts 4–80V input; also rated for –60V reverse bias; powers internal circuitry and charge pump. |
| SHDN | Shutdown control input | Active-low input; ≤0.4V forces shutdown (ICC < 7µA); tolerates –60V to +100V; no external pull-up required due to internal bias. |
| FB | Feedback input for OV regulation | Connects to mid-point of resistive divider from OUT to GND; servo loop holds 1.275V here to set regulated output voltage. |
| TMR | Fault timer capacitor connection | Capacitor-to-GND sets warning (1.275V), shutdown (1.375V), and cool-down (4.3V→0.5V) thresholds; current scales with VDS. |
| ENOUT | Enable output indicator | Open-collector output goes high-Z when OUT is within 0.5V of VCC and >3V - confirms MOSFET is fully enhanced. |
| FLT | Fault indicator output | Open-collector output pulls low at VTMR = 1.275V (early warning); remains low after latch-off until SHDN reset. |
| UV | Undervoltage comparator input | Threshold = 1.275V (±12mV hysteresis); pulls GATE low if input drops below UV threshold - prevents startup under brownout. |
| GND | Device ground reference | Primary ground return for internal amplifiers, comparators, and charge pump; connects to PCB ground plane. |
| NC | No-connect terminal | Pins 3, 5, 11, and 13 are internally unused; must be left floating or tied to GND per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Latched fault response | LT4363-1 variant ensures GATE and FLT remain low after timeout until explicit SHDN reset - eliminates uncontrolled retries in sustained faults. |
| Dynamic fault timing | TMR current scales with VCC–OUT voltage drop, enabling shorter fault durations at higher MOSFET stress - directly protects SOA during 100V surges. |
| Reverse input protection | SHDN, UV, OV pins tolerate –60V; allows back-to-back N-MOSFET configuration replacing Schottky diodes - cuts forward drop by >0.4V and power loss by >70%. |
| Ultra-low shutdown current | 7µA ICC(SHDN) enables battery-backed systems to maintain >10-year shelf life without compromising surge readiness. |
| High-accuracy sensing | ±1% FB reference (1.275V) and ±3mV ΔVSNS tolerance ensure stable 27V clamp and repeatable 50mV current limit across temperature and voltage range. |
Applications
| Avionic Power Distribution | Industrial PLC Backplane Protection |
|---|---|
Use Scenario: Protects flight-critical avionics modules from 100V load dump transients on 28V aircraft buses. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V while controlling external N-MOSFET; latched shutdown prevents spurious restart during extended overvoltage. Use Value: Enables uninterrupted operation during short transients and guaranteed isolation during sustained faults - meets DO-160 Section 22 Level 4 requirements. |
Use Scenario: Secures programmable logic controller I/O modules against 80V surges induced by inductive load switching in factory automation. IC Role / Device Role / Timing Role: High-side switch with adjustable UV lockout and 50mV current limit; TMR capacitor sets 100ms fault window scaled to MOSFET SOA. Use Value: Eliminates need for discrete TVS + fuse + relay stacks - reduces BOM count by 4 parts and PCB area by 35%. |
| Railway Signaling Power Supply | Intrinsic Safety Barriers |
Use Scenario: Guards track-side signaling electronics from 120V transients on 72V DC traction power rails. IC Role / Device Role / Timing Role: Input protector with –60V reverse rating and 125°C MP-grade operation; UV comparator prevents startup below 42V nominal. Use Value: Withstands EN 50155 Class S2 surge profiles without derating; qualified for –55°C cold-weather deployment. |
Use Scenario: Limits energy delivery to hazardous-area field instruments in Zone 0/1 intrinsically safe barriers. IC Role / Device Role / Timing Role: Precision current limiter (25mV foldback at low OUT) and voltage clamp (27V) enforcing IEC 60079-11 power limits. Use Value: Replaces analog current-limiting ICs with tighter tolerance (±1%) and faster response (<1µs) - simplifies safety certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363HDE-1#TRPBF | Same functionality and pinout, but in 12-lead DFN (4mm × 3mm); θJA = 43°C/W vs SO's 80°C/W; no NC pins. | Better thermal performance in space-constrained layouts; lacks SO package's creepage/clearance for high-voltage isolation. | Select for compact, thermally demanding designs where PCB area is critical and isolation distance is managed externally. |
| LT4363IMS-1#TRPBF | Same function, 12-lead MSOP package; θJA = 135°C/W; rated –40°C to 85°C (I-grade) vs MP-grade –55°C to 125°C. | Lower cost and smaller footprint than SO-16, but unsuitable for extended temperature or military-spec deployments. | Select for commercial/industrial applications where ambient temperature stays below 85°C and size savings justify reduced ruggedness. |
Compared with LT4363HDE-1#TRPBF and LT4363IMS-1#TRPBF, the LT4363MPS-1#TRPBF offers superior high-temperature reliability (–55°C to 125°C), larger creepage for 80V+ systems, and legacy SO-package compatibility - making it optimal for avionics, rail, and long-lifecycle industrial programs.
Availability
LT4363MPS-1#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial PLC backplane protection, and railway signaling power supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4363MPS-1#TRPBF 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.) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT4363 family is designed as high-voltage surge stoppers for mission-critical power systems - targeting avionics, industrial control, rail, and intrinsic safety applications where latch-off behavior, wide temperature operation, and precise current/voltage regulation are mandatory.
FAQ
What is the key functional difference between LT4363MPS-1#TRPBF and LT4363MPS-2#TRPBF?
The LT4363MPS-1#TRPBF implements latch-off behavior: once the TMR pin reaches 1.375V and triggers shutdown, GATE and FLT remain low until SHDN is actively pulsed low for ≥100µs. In contrast, LT4363MPS-2#TRPBF automatically retries after cool-down (TMR discharges to 0.5V), unless inhibited by OV pin voltage >1.275V. This makes LT4363MPS-1#TRPBF preferred for fail-safe systems where uncontrolled restart could compromise safety.
How does the LT4363MPS-1#TRPBF achieve dynamic fault timing based on MOSFET stress?
The LT4363MPS-1#TRPBF measures VCC–OUT voltage to infer MOSFET VDS and scales the TMR charging current accordingly - from ~4µA at VDS ≤ 0.5V to 50µA at VDS = 75V during overvoltage. This ensures shorter fault durations under high-stress conditions, keeping the external MOSFET within its safe operating area. The same principle applies during overcurrent, with ~5× higher TMR current for equivalent VDS.
Can the LT4363MPS-1#TRPBF be used with P-channel MOSFETs?
No - the LT4363MPS-1#TRPBF is specifically designed to drive N-channel MOSFETs in high-side configuration. Its GATE driver is a charge-pump-based high-side source referenced to OUT, capable of pulling up to 13V above OUT. Driving a P-channel device would require inverted logic, negative gate drive, and incompatible biasing - use dedicated P-channel controllers like LTC4412 instead.
What is the minimum TMR capacitor value required for stable operation of LT4363MPS-1#TRPBF?
A minimum 10nF capacitor is required between TMR and GND to compensate the control loop and prevent oscillation during regulation. Smaller values risk instability in the voltage/current servo loops. Typical designs use 100nF–1µF ceramics to achieve fault windows from ~10ms to >1s, depending on VDS and application safety requirements.
Does the LT4363MPS-1#TRPBF support reverse polarity protection without additional components?
Yes - the LT4363MPS-1#TRPBF supports reverse input protection up to –60V on VCC, SHDN, UV, and OV pins. When paired with a second N-channel MOSFET in back-to-back configuration (source-to-source), it replaces Schottky diodes entirely. This achieves <0.05V forward drop versus >0.4V for diodes, eliminating heat sink requirements and improving efficiency in battery-powered systems.
LT4363MPS-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-1#TRPBF FAQ
1.How can I place an order for LT4363MPS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363MPS-1#TRPBF 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-1#TRPBF reliable?
The price and inventory of LT4363MPS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363MPS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4363MPS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363MPS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363MPS-1#TRPBF?
LT4363MPS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363MPS-1#TRPBF 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-1#TRPBF?
For technical support, including LT4363MPS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363MPS-1#TRPBF requirements.
6.How does Aetrix verify that LT4363MPS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4363MPS-1#TRPBF 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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4363MPS-1#TRPBF?
All LT4363MPS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363MPS-1#TRPBF, 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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT4363MPS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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