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Analog Devices Inc. LTC4381ADKE-2#PBF
- Part No.:
- LTC4381ADKE-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-2#PBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
LTC4381ADKE-2#PBF from Analog Devices is a low-quiescent-current eFuse IC with integrated 9mΩ N-channel MOSFET, fixed 28.5V/47V output clamp voltage selection via SEL pin, guaranteed MOSFET safe operating area (20ms at 70V/1A), and auto-retry fault behavior for automotive load dump protection in 12V systems.
For engineers reviewing the LTC4381ADKE-2#PBF datasheet, LTC4381ADKE-2#PBF pinout, LTC4381ADKE-2#PBF application, or LTC4381ADKE-2#PBF equivalent, this device delivers surge-hardened high-side power switching with precise overvoltage clamping, adjustable current limiting, and thermally aware fault timing - critical for battery-backed, always-on, and cold-crank automotive electronics.
Technical Context
The LTC4381ADKE-2#PBF implements a dual-mode fault timer using TMR pin integration: during overvoltage or overcurrent events, internal multiplier current scales with VDS × ID to accelerate turn-off under high MOSFET stress, while cool-down phase enables automatic restart after fault clearance. Its GATE drive is regulated to 11.5V above OUT, clamped to 17V above OUT and 31.5V above GND (SEL = GND).
It features reverse input protection to –60V, operates from 4V to 72V input, withstands 100V transients without external TVS, and uses SNS–OUT differential sensing (50mV/62mV threshold) for current limiting - all within a production-tested SOA guarantee of 20ms at 70V/1A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 72V - supports automotive cold crank down to 4V while maintaining operation through 12V system brownouts. |
| Quiescent Current | 6µA typical - enables use in always-on battery-powered systems without significant standby drain. |
| MOSFET RON | 9mΩ max - minimizes conduction loss and self-heating in high-current paths up to 1A continuous. |
| Output Clamp Voltage | Selectable 28.5V (SEL = GND) or 47V (SEL = VCC) - matches 12V or 24V/28V automotive architectures without external components. |
| Fault Behavior | Auto-retry (LTC4381-2 variant) - automatically recovers after cool-down without manual reset, reducing system downtime. |
| SOA Guarantee | 20ms at 70V/1A - ensures robustness against sustained load-dump transients per ISO 7637-2 Pulse 5a. |
| Reverse Input Rating | –60V - protects against battery reversal or negative supply faults in vehicle wiring harnesses. |
Pinout & Package
32-lead (7mm × 5mm) plastic DFN package with exposed thermal pad (Pin 33). RoHS-compliant, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET Drain Input | Connects to unregulated input supply; withstands 100V transient surges. |
| SRC | MOSFET Source Output | Drives load through external sense resistor; clamped to 28.5V (SEL = GND) or 47V (SEL = VCC). |
| SNS | Current Sense Input | Monitors voltage drop across sense resistor; sets current limit at 50mV (normal) or 62mV (severe short). |
| OUT | Output Voltage Sense | Reference point for SNS and GATE regulation; requires ≥22µF local bypass capacitance. |
| GATE | Internal MOSFET Gate Driver | Regulated to 11.5V above OUT; clamped to 17V above OUT and 31.5V above GND (SEL = GND). |
| GFET | Internal MOSFET Gate Terminal | Connected to GATE via 10Ω resistor; isolates gate drive loop from parasitic oscillation. |
| TMR | Fault Timer Integration Node | Capacitor-connected node controlling fault timeout and auto-retry cool-down period. |
| FLT | Open-Drain Fault Indicator | Pulls low during overvoltage/overcurrent fault; sinks up to 3mA for system-level fault signaling. |
| ON | Enable/Shutdown Control | Logic input with 1.05V threshold; open-drain compatible; supports undervoltage lockout and remote control. |
| SEL | Clamp Voltage Select | GND = 28.5V clamp; VCC/OUT = 47V clamp - configures for 12V or 24V/28V system compliance. |
| VCC | Bias Supply Input | 4V–72V operating range; powers internal circuitry independently of IN; may be Zener-clamped for adjustable clamp. |
| DRN | VDS Sense Feedback | Current proportional to MOSFET VDS; used with RDRN to scale TMR current for SOA-aware timing. |
| GND | Device Ground Reference | Common return for analog and power sections; connects to exposed thermal pad (Pin 33). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 9mΩ MOSFET | Eliminates external pass transistor and associated layout complexity while guaranteeing SOA under load dump. |
| Auto-retry fault recovery | Enables hands-free recovery from transient overvoltage or overload without host MCU intervention or PCB reset circuitry. |
| No input TVS required | Withstands 100V surges directly on IN pin - reduces BOM count and board space vs. discrete TVS + fuse solutions. |
| Reverse input protection to –60V | Prevents damage from battery misconnection or ground-referenced negative transients in vehicle service environments. |
| Adjustable fault timing via TMR capacitor | Allows tuning of trip delay and cool-down interval to match specific load inertia, thermal mass, and safety requirements. |
| Low 6µA operating current | Extends battery life in always-on telematics, ADAS sensors, and infotainment modules with persistent power rails. |
Applications
| Automotive Load Dump Protection | 12V Battery-Powered Telematics |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from ISO 7637-2 Pulse 5a (100V/400ms) load dump events in 12V vehicles. IC Role / Device Role / Timing Role: High-side eFuse with clamped output voltage and SOA-guaranteed MOSFET limits energy delivered to downstream circuitry during surge. Use Value: Eliminates need for external TVS diode and series fuse, reducing component count and enabling compact, reliable front-end protection. |
Use Scenario: Power management for always-on GPS trackers and cellular modems in parked vehicles with limited battery capacity. IC Role / Device Role / Timing Role: Low-quiescent-current eFuse providing overvoltage/overcurrent protection while drawing only 6µA in active state. Use Value: Extends standby runtime by >3× versus traditional eFuses, enabling multi-week battery operation without recharge. |
| Avionic Surge Protection | Industrial Hot-Swap Power Distribution |
Use Scenario: Safeguarding avionics subsystems (e.g., flight displays, comms radios) against 100V transients on 28V aircraft buses. IC Role / Device Role / Timing Role: Adjustable clamp eFuse with 47V output limit (SEL = VCC) and guaranteed SOA for MIL-STD-704F compliance. Use Value: Meets stringent aerospace reliability requirements without custom thermal derating or external crowbar circuits. |
Use Scenario: Enabling live insertion of field-replaceable modules in industrial PLC backplanes with 24V DC power rails. IC Role / Device Role / Timing Role: Auto-retry eFuse that clears temporary overloads (e.g., motor startup inrush) and restores power without operator action. Use Value: Improves system uptime and reduces maintenance downtime by eliminating manual reset requirement after transient faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar eFuse applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS26631PWPR | Lower 4.5V–60V input range; 12mΩ RON; no internal clamp - requires external TVS for 100V surge. | Targeted at industrial 24V systems with lower surge immunity needs; lacks automotive-grade SOA guarantee. | Choose when cost sensitivity outweighs 100V surge tolerance and SOA validation requirements. |
| MAX17613ATG+T | Wider 4.5V–65V range; 10mΩ RON; fixed 36V clamp; latch-off only - no auto-retry capability. | Designed for telecom/datacom hot-swap; lacks reverse input rating (–60V) and cold-crank support below 4.5V. | Prefer when deterministic latch-off is required for safety-critical shutdown, not automatic recovery. |
Compared with TPS26631PWPR and MAX17613ATG+T, the LTC4381ADKE-2#PBF uniquely combines 100V surge tolerance without external TVS, guaranteed 20ms SOA at 70V/1A, –60V reverse input rating, and auto-retry behavior - making it the only option qualified for demanding automotive load dump and cold-crank scenarios.
Availability
LTC4381ADKE-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, 12V battery-powered telematics, and avionic surge protection requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC4381ADKE-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 healthcare markets.
The LTC4381 family is designed specifically for robust, low-quiescent-power eFuse protection in harsh automotive and avionic environments - emphasizing surge resilience, guaranteed SOA, and seamless cold-crank operation.
FAQ
What is the output clamp voltage configuration for LTC4381ADKE-2#PBF?
The LTC4381ADKE-2#PBF supports two fixed output clamp voltages: 28.5V when the SEL pin is tied to GND, and 47V when SEL is tied to VCC or OUT. This selection is hardware-configurable and does not require programming or external resistors - enabling rapid adaptation to 12V or 24V/28V system architectures without firmware changes.
Does LTC4381ADKE-2#PBF require an external TVS diode for 100V surge protection?
No, the LTC4381ADKE-2#PBF withstands 100V transients directly on the IN pin without external TVS protection. Its internal architecture - including clamped GATE drive, SOA-guaranteed MOSFET, and robust pin ratings - eliminates the need for discrete TVS components, reducing BOM count, PCB area, and failure modes in automotive and avionic designs.
How does the auto-retry feature of LTC4381ADKE-2#PBF operate during overvoltage faults?
During an overvoltage fault, the LTC4381ADKE-2#PBF enters a cool-down phase after turning off the MOSFET: the TMR pin cycles between 1.215V and 100mV for 15 intervals before discharging fully. Once TMR reaches 100mV, the device automatically restarts - enabling hands-free recovery from transient surges like load dump without host intervention or manual reset.
What is the guaranteed safe operating area (SOA) for LTC4381ADKE-2#PBF?
The LTC4381ADKE-2#PBF guarantees MOSFET safe operating area of 20ms at 70V and 1A - validated across temperature and process corners. This specification ensures reliable operation during worst-case automotive load dump events (ISO 7637-2 Pulse 5a), preventing thermal runaway even under sustained high-power stress conditions.
Can LTC4381ADKE-2#PBF operate during automotive cold crank conditions?
Yes, the LTC4381ADKE-2#PBF operates continuously down to 4V input voltage, meeting automotive cold crank requirements where battery voltage dips below 6V. Its ultra-low 6µA quiescent current and wide 4V–72V input range ensure uninterrupted power delivery to critical systems such as engine control modules and body controllers during cranking.
LTC4381ADKE-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Electronic Fuse
- Sensing Method:
- High-Side
- Accuracy:
- -
- Voltage - Input:
- 4V ~ 72V
- Current - Output:
- 500mA
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (7x5)
LTC4381ADKE-2#PBF FAQ
1.How can I place an order for LTC4381ADKE-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-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 LTC4381ADKE-2#PBF reliable?
The price and inventory of LTC4381ADKE-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 LTC4381ADKE-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-2#PBF?
LTC4381ADKE-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-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 LTC4381ADKE-2#PBF?
For technical support, including LTC4381ADKE-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-2#PBF requirements.
6.How does Aetrix verify that LTC4381ADKE-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-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 LTC4381ADKE-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-2#PBF?
All LTC4381ADKE-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-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 LTC4381ADKE-2#PBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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