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Analog Devices Inc. LT4363CDE-1#TRPBF
- Part No.:
- LT4363CDE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4363CDE-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER HV 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,299
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Product details
Overview
LT4363CDE-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, limits current via 50mV SNS–OUT sense threshold, and features latch-off fault response with 1.275V TMR fault threshold. It operates from 4V to 80V input, supports reverse input protection to –60V, and is used in avionic power supplies requiring robust overvoltage/overcurrent protection.
For engineers reviewing the LT4363CDE-1#TRPBF datasheet, LT4363CDE-1#TRPBF pinout, LT4363CDE-1#TRPBF application, or LT4363CDE-1#TRPBF equivalent, key selection criteria include its 12-lead DFN (4mm × 3mm) package, C-grade temperature range (0°C to 70°C), LT4363-1 latch-off behavior, adjustable UV/OV thresholds, and 7µA shutdown current - all critical for hot-swap and battery-powered industrial systems.
Technical Context
The LT4363CDE-1#TRPBF implements dual-fault protection using independent voltage and current regulation loops: an internal amplifier maintains 1.275V at FB during overvoltage, while a precision current sense circuit holds ΔVSNS = 50mV (or 25mV if OUT < 2V) during overcurrent. Fault timing is dynamically scaled by VCC–OUT voltage to align with MOSFET safe operating area.
It integrates a charge pump gate driver delivering ≥13V above OUT, a 12-lead DFN package with exposed GND pad, and comparator-based UV/OV monitoring with 1.275V thresholds and 12mV/7.5mV hysteresis. The LT4363-1 variant latches off permanently after fault timeout and requires active SHDN reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input; enables direct use in 12V/24V/48V industrial and automotive systems without pre-regulation. |
| Current Sense Threshold | 50mV (SNS–OUT); sets precise 10A limit with 5mΩ sense resistor, reducing MOSFET stress during overload. |
| Fault Timer Thresholds | 1.275V (FLT warning), 1.375V (MOSFET turn-off); provides deterministic, voltage-scaled timing for SOA compliance. |
| Shutdown Current | <7µA; allows ultra-low-power hold-up during system sleep modes without compromising protection readiness. |
| UV/OV Threshold | 1.275V ±15mV; enables accurate, resistor-programmable input supervision for brown-out and surge detection. |
| Gate Drive Capability | ≥13V above OUT; ensures full enhancement of standard logic-level N-MOSFETs even under low-VOUT conditions. |
| Reverse Input Rating | –60V on VCC/SHDN/UV/OV pins; supports reverse-battery protection in vehicle electronics without external diodes. |
Pinout & Package
LT4363CDE-1#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 is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | N-MOSFET gate drive output | Charge-pump-driven output regulating MOSFET conduction; clamped to ≤14V above OUT to prevent gate oxide damage. |
| SNS | Current sense input | High-side sense node referenced to OUT; monitors voltage drop across external sense resistor for overcurrent limiting. |
| OUT | MOSFET source sense input | Direct connection to MOSFET source; establishes reference for both current sensing and fault timer scaling (VCC–OUT). |
| FB | Voltage regulation feedback | Connects to resistive divider from OUT to GND; servo-controlled to maintain 1.275V for adjustable output clamp. |
| TMR | Fault timer capacitor node | Capacitor-to-GND sets timing for FLT warning, MOSFET turn-off, and cool-down; current scales with VCC–OUT. |
| FLT | Open-collector fault indicator | Pulls low at 1.275V TMR to signal impending shutdown; latched low until SHDN reset for LT4363-1. |
| SHDN | Active-low shutdown control | Pulled below 0.4V to enter 7µA shutdown; withstands –60V to +100V, enabling robust system-level control. |
| UV | Undervoltage comparator input | Monitors input rail; pulls GATE low if voltage falls below 1.275V, preventing operation during brown-out. |
| VCC | Main supply input | Primary power rail (4V–80V); also rated for –60V reverse bias, supporting bidirectional fault tolerance. |
| GND | Device ground reference | Common return for analog and power circuits; exposed pad must be connected to PCB GND for thermal performance. |
| ENOUT | Enable output status indicator | Open-collector output high-impedance when MOSFET is fully enhanced (VOUT within 0.5V of VCC). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output overvoltage clamp | Set via FB resistive divider; enables precise 12V/15V/24V/27V clamping without external regulators. |
| Dynamic fault timer scaling | TMR current varies with VCC–OUT voltage; shortens timeout during high-dissipation faults to protect MOSFET SOA. |
| Back-to-back MOSFET reverse protection | Eliminates Schottky diode drop; reduces forward loss by >0.3V and improves efficiency in battery-fed systems. |
| Latch-off fault response (LT4363-1) | Permanently disables GATE after timeout until SHDN pulse; prevents uncontrolled retries during sustained faults. |
| Sub-5µs overcurrent turn-off | tOFF(OC) ≤ 2.5µs ensures rapid response to short circuits, minimizing energy delivered to faulted loads. |
Applications
| Avionic Power Distribution | Industrial Hot-Swap Module |
|---|---|
Use Scenario: Protecting flight-critical avionics from 100V load dump transients in MIL-STD-704F compliant aircraft power systems. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp regulated output at 27V while maintaining uninterrupted operation. Use Value: Enables continuous function during 100ms surges without resetting microcontrollers or losing sensor data. | Use Scenario: Inserting/replacing line cards in telecom chassis powered from –48V DC distribution buses. IC Role / Device Role / Timing Role: High-side switch with programmable UV lockout and 7µA shutdown, enabling controlled inrush and fault isolation. Use Value: Prevents bus collapse during card insertion and eliminates need for mechanical interlocks or complex sequencing. |
| Battery-Powered Medical Equipment | Intrinsic Safety Barriers |
Use Scenario: Safeguarding portable ultrasound and patient monitors against reverse battery connection and 80V ESD-induced transients. IC Role / Device Role / Timing Role: Reverse-input tolerant protector with –60V VCC rating and latch-off fault handling for fail-safe shutdown. Use Value: Meets IEC 60601-1 creepage/clearance requirements while eliminating discrete diode stacks and saving board space. | Use Scenario: Isolating hazardous-area sensors in oil/gas refineries where power must survive lightning-induced surges up to 100V. IC Role / Device Role / Timing Role: Intrinsically safe overvoltage regulator limiting energy delivery to field devices during fault events. Use Value: Complies with IEC 60079-11 by restricting fault power to <1.3W (at 50mV/10A) and ensuring thermal shutdown before ignition risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363CDE-2#TRPBF | Auto-restart (LT4363-2) instead of latch-off; same pinout, package, and specs except fault recovery behavior. | Suitable for non-critical systems where automatic recovery after transient is acceptable. | Select LT4363CDE-2#TRPBF only if retry duty cycle (<2%) is acceptable and manual reset is undesirable. |
| TPS26631RGER | Integrated 60V eFuse with fixed 1.2V current sense; no external MOSFET required but lacks adjustable OV clamp and dynamic timer scaling. | Better for compact, cost-sensitive designs where 27V clamping and SOA-optimized timing are not required. | Choose TPS26631RGER for simplified BOM and smaller footprint when programmable clamp and precise SOA protection are secondary. |
Compared with LT4363CDE-2#TRPBF, the LT4363CDE-1#TRPBF provides deterministic, operator-controlled recovery after fault - essential for safety-critical avionics - whereas TPS26631RGER trades configurability for integration, omitting adjustable OV regulation and VDS-scaled timing entirely.
Availability
LT4363CDE-1#TRPBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, and battery-powered medical equipment requiring stable component supply across extended production lifecycles.
Supply support for LT4363CDE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and aerospace markets.
The LT4363 family is designed for high-reliability power path protection in harsh environments, emphasizing robust surge immunity, precise fault timing, and flexible external MOSFET control for scalable power delivery.
FAQ
What is the operating temperature range for the LT4363CDE-1#TRPBF?
The LT4363CDE-1#TRPBF is specified for commercial temperature operation from 0°C to 70°C, as indicated by the "C" grade suffix. This range is validated per the device's absolute maximum ratings and electrical characteristics tables, and applies specifically to the 12-lead DFN package (DE) configuration.
How does the LT4363CDE-1#TRPBF differ from the LT4363CDE-2#TRPBF?
The LT4363CDE-1#TRPBF implements latch-off fault behavior: once the TMR pin reaches 1.375V, the GATE pin stays low until SHDN is pulsed. In contrast, the LT4363CDE-2#TRPBF automatically restarts after TMR discharges to 0.5V. Both share identical pinout, package, and electrical specs except for this recovery mode.
Can the LT4363CDE-1#TRPBF drive a logic-level N-channel MOSFET directly?
Yes - the LT4363CDE-1#TRPBF's GATE pin delivers ≥13V above the OUT pin via an internal charge pump, sufficient to fully enhance standard logic-level N-MOSFETs (e.g., Rds(on) < 10mΩ at Vgs = 10V). Its 14V internal clamp protects against overdrive during fault conditions.
What is the purpose of the TMR pin capacitor in the LT4363CDE-1#TRPBF circuit?
The TMR pin capacitor sets three critical timing intervals: early fault warning (FLT low at 1.275V), MOSFET turn-off (at 1.375V), and cool-down period (until TMR falls to 0.5V). Its value determines total fault duration and scales dynamically with VCC–OUT voltage to match MOSFET safe operating area constraints.
Does the LT4363CDE-1#TRPBF require external components for basic overvoltage protection?
Yes - the LT4363CDE-1#TRPBF requires an external N-channel MOSFET, current sense resistor (for overcurrent), FB resistive divider (for OV clamp setting), and TMR capacitor (for timing). No external compensation or bootstrap components are needed due to integrated charge pump and amplifiers.
LT4363CDE-1#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:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT4363CDE-1#TRPBF FAQ
1.How can I place an order for LT4363CDE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363CDE-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 LT4363CDE-1#TRPBF reliable?
The price and inventory of LT4363CDE-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 LT4363CDE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4363CDE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363CDE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363CDE-1#TRPBF?
LT4363CDE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363CDE-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 LT4363CDE-1#TRPBF?
For technical support, including LT4363CDE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363CDE-1#TRPBF requirements.
6.How does Aetrix verify that LT4363CDE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4363CDE-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 LT4363CDE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4363CDE-1#TRPBF?
All LT4363CDE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363CDE-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 LT4363CDE-1#TRPBF part is unused and in its original packaging.
Return procedure for LT4363CDE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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