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Analog Devices Inc. LT4363HDE-2#TRPBF
- Part No.:
- LT4363HDE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4363HDE-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,367
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Product details
Overview
LT4363HDE-2#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, 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 avionic and industrial power rails in hot-swap and battery-powered high-side switch applications.
For engineers reviewing the LT4363HDE-2#TRPBF datasheet, LT4363HDE-2#TRPBF pinout, LT4363HDE-2#TRPBF application, or LT4363HDE-2#TRPBF equivalent, this page delivers verified specifications, thermal-grade packaging (–40°C to 125°C), DFN-12 pin mapping, real-world fault timing behavior, and validated alternatives for surge protection design.
Technical Context
The LT4363HDE-2#TRPBF uses dual feedback loops: a voltage servo (FB pin, 1.275V reference) regulating GATE to clamp output during overvoltage, and a current servo (SNS–OUT, 50mV threshold) limiting MOSFET conduction during overcurrent. Its TMR pin integrates variable-current charging-scaling with VCC–VOUT-to dynamically adapt fault timing to MOSFET SOA constraints.
Unlike the latch-off LT4363-1 variant, the LT4363-2 version implements automatic cool-down and retry: after TMR discharges to 0.5V, GATE re-enables without external reset. The OV pin (present only on -2 variants) inhibits retry while input remains above 1.275V, preventing oscillation under sustained overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input; supports –60V reverse input without damage-enables robust battery and vehicle power rail protection. |
| Output Clamp Accuracy | 1.275V FB reference ±2.5% over –40°C to 125°C-ensures stable 27V output regulation with standard resistor dividers. |
| Current Sense Threshold | 50mV SNS–OUT differential (±6% over temp)-sets precise 10A limit with 5mΩ sense resistor; folds to 25mV if OUT < 2V for short-circuit safety. |
| Fault Response Speed | <1µs overvoltage turn-off propagation; <2.5µs overcurrent turn-off-prevents MOSFET avalanche during fast transients. |
| Shutdown Current | <7µA at SHDN = 0V-enables ultra-low-power hold-up in always-on systems with battery backup. |
| TMR Timer Behavior | Charges at 4–50µA (OV) or 8–260µA (OC) based on VCC–VOUT; 1.275V FLT warning, 1.375V shutdown, 0.5V auto-restart-adaptive SOA protection. |
| Package & Temp Grade | 12-lead 4mm × 3mm DFN with exposed pad; rated –40°C to 125°C junction-suitable for under-hood automotive and industrial control environments. |
Pinout & Package
LT4363HDE-2#TRPBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed thermal pad (Pin 13, connected to GND). The package supports high-power dissipation (θJA = 43°C/W) and operates up to 125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6 | FB, OUT, SNS, GATE, VCC, SHDN | Feedback reference, output sense, current sense, MOSFET gate drive, supply input, and shutdown control-core functional interface for surge regulation. |
| 7, 8, 9, 10, 11, 12 | TMR, ENOUT, FLT, GND, UV, OV | Fault timer capacitor node, enable output status flag, open-collector fault alert, ground reference, undervoltage monitor, and overvoltage inhibit-enables adaptive timing and system-level fault coordination. |
| 13 | Exposed Pad | Thermal and electrical connection to GND-mandatory for thermal performance; improves power handling and EMI immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | LT4363HDE-2#TRPBF restarts after TMR cools to 0.5V-eliminates manual reset in remote or inaccessible systems. |
| Reverse input protection | Withstands –60V on VCC/SHDN/UV/OV-enables back-to-back MOSFET configurations replacing Schottky diodes, reducing drop and loss. |
| Adjustable UV/OV lockout | 1.275V thresholds with 7.5–12mV hysteresis-configurable via external resistors to match system brown-in/brown-out requirements. |
| Dynamic fault timing | TMR current scales with VCC–VOUT-shorter fault windows at high stress, longer windows at low stress-maximizes MOSFET SOA utilization. |
| Low-quiescent shutdown | 7µA ICC(SHDN) at –40°C to 125°C-preserves battery life in always-on monitoring circuits without compromising thermal rating. |
Applications
| Avionic Power Protection | Industrial Hot-Swap Module |
|---|---|
|
Use Scenario: Aircraft power distribution units exposed to load dump surges exceeding 100V and reverse polarity events. IC Role / Device Role / Timing Role: High-side surge stopper controlling N-MOSFET pass device; regulates output to 27V during transients while monitoring SNS–OUT for overcurrent. Use Value: Maintains uninterrupted operation of flight-critical avionics during MIL-STD-704F transients; –40°C to 125°C grade ensures reliability across cabin-to-bay temperature gradients. |
Use Scenario: Modular PLC I/O cards inserted live into powered backplanes with ±15% supply variation and ESD risk. IC Role / Device Role / Timing Role: Hot-swap controller enforcing soft-start, current limiting, and fault isolation via GATE drive and TMR-based timing. Use Value: Prevents bus voltage sag and arcing during insertion; 50mV current limit enables precise 8A max per slot with minimal sense resistor loss. |
| High-Side Battery Switch | Intrinsic Safety Barrier |
|
Use Scenario: Rechargeable Li-ion battery packs in portable medical devices requiring reverse-polarity and overvoltage protection. IC Role / Device Role / Timing Role: High-side switch driver with UV lockout (prevents discharge below 3.0V) and OV inhibition (blocks charge above 4.3V). Use Value: Extends battery cycle life by enforcing strict voltage windows; SHDN withstands –60V to 100V-enables direct connection to unregulated battery terminals. |
Use Scenario: Hazardous-area instrumentation (Class I, Div 1) where energy limiting is mandated for spark prevention. IC Role / Device Role / Timing Role: Intrinsically safe power conditioner limiting fault energy via 25mV foldback current sense and sub-2% retry duty cycle. Use Value: Complies with IEC 60079-11 by restricting fault power delivery; auto-retry avoids unsafe manual intervention in explosive atmospheres. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#TRPBF | Integrated 42V MOSFET; fixed 28V clamp; no FB pin; 2.7V–42V range; no OV comparator | Better for space-constrained designs needing integrated FET; unsuitable for >42V or adjustable clamp voltage | Select LTC4365 when board area is critical and 28V clamp suffices; avoid if input exceeds 42V or programmable regulation is required. |
| TPS26631PWPR | 40V max; integrated 100mΩ FET; fixed 32V OVP; no current foldback; 1.2ms fixed retry delay | Lower-cost solution for non-military 24V industrial systems; lacks thermal-grade rating and adaptive timing | Choose TPS26631 for cost-sensitive 24V applications where –40°C to 105°C suffices and fixed timing meets SOA needs. |
Compared with LTC4365IMS-2#TRPBF and TPS26631PWPR, LT4363HDE-2#TRPBF offers wider 4V–80V operation, field-adjustable clamp via FB, true adaptive fault timing, and extended –40°C to 125°C qualification-making it uniquely suited for high-reliability, high-voltage, thermally demanding surge protection.
Availability
LT4363HDE-2#TRPBF is available at Aetrix Electronics and suitable for avionic power protection, industrial hot-swap modules, and high-side battery switch applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4363HDE-2#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.) designs precision analog, mixed-signal, and digital signal processing ICs for high-performance applications.
The LT4363 product line delivers high-voltage surge protection with adaptive fault management for mission-critical power systems in aerospace, industrial automation, and transportation.
FAQ
What is the maximum input voltage the LT4363HDE-2#TRPBF can withstand without damage?
The LT4363HDE-2#TRPBF has an absolute maximum VCC rating of 100V and can tolerate –60V reverse input. Its internal clamps protect pins like SHDN, UV, and OV up to 100V or down to –60V. This allows direct use in 24V/48V industrial systems subject to ISO 7637-2 load dump transients, provided external TVS devices handle peak energy beyond the IC's clamping capability.
How does the LT4363HDE-2#TRPBF differ from the LT4363-1 variant?
The LT4363HDE-2#TRPBF implements auto-retry fault recovery: after TMR discharges to 0.5V, GATE re-enables automatically. In contrast, the LT4363-1 latches off permanently until SHDN is pulsed low for ≥100µs. The LT4363HDE-2#TRPBF also includes the OV pin to inhibit retry during sustained overvoltage-critical for stable operation in noisy power environments.
Can the LT4363HDE-2#TRPBF be used with P-channel MOSFETs?
No-the LT4363HDE-2#TRPBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver pulls up to ~13V above OUT and includes a 14V clamp. Driving a P-channel device would require inverted logic, level shifting, and external charge pump circuitry not supported by the LT4363HDE-2#TRPBF architecture.
What is the purpose of the ENOUT pin on the LT4363HDE-2#TRPBF?
The ENOUT pin on the LT4363HDE-2#TRPBF is an open-collector enable output that goes high-impedance when VOUT is within 0.5V of VCC and >3V above GND-indicating the external MOSFET is fully enhanced. It latches until VOUT drops below 2V, providing a reliable "power good" signal for downstream DC/DC converters or microcontrollers monitoring system readiness.
How is the current limit threshold set on the LT4363HDE-2#TRPBF?
The LT4363HDE-2#TRPBF fixes the SNS–OUT differential at 50mV (±6%) during normal current limiting. With a 10mΩ sense resistor, this yields a 5A limit; with 5mΩ, it yields 10A. During severe shorts (VOUT < 2V), the threshold folds to 25mV to reduce MOSFET power dissipation. No external components adjust this value-it is trimmed internally and specified over –40°C to 125°C.
LT4363HDE-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-DFN (4x3)
LT4363HDE-2#TRPBF FAQ
1.How can I place an order for LT4363HDE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363HDE-2#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 LT4363HDE-2#TRPBF reliable?
The price and inventory of LT4363HDE-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363HDE-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4363HDE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363HDE-2#TRPBF transactions.
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4.How is shipping managed for LT4363HDE-2#TRPBF?
LT4363HDE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363HDE-2#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 LT4363HDE-2#TRPBF?
For technical support, including LT4363HDE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363HDE-2#TRPBF requirements.
6.How does Aetrix verify that LT4363HDE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4363HDE-2#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 LT4363HDE-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4363HDE-2#TRPBF?
All LT4363HDE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363HDE-2#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 LT4363HDE-2#TRPBF part is unused and in its original packaging.
Return procedure for LT4363HDE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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