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Analog Devices Inc. LTC4381ADKE-1#PBF
- Part No.:
- LTC4381ADKE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-1#PBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
LTC4381ADKE-1#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 (SEL = GND → 28.5V), latch-off fault behavior, and guaranteed MOSFET safe operating area (20ms at 70V/1A). It delivers automotive-grade load dump protection for 12V systems and operates from 4V to 80V input.
For engineers reviewing the LTC4381ADKE-1#PBF datasheet, LTC4381ADKE-1#PBF pinout, LTC4381ADKE-1#PBF application, or LTC4381ADKE-1#PBF equivalent, key selection criteria include latch-off response to overvoltage, internal 28.5V clamp for 12V automotive systems, 6µA quiescent current for always-on battery operation, and SOA-tested MOSFET stress handling during 100V transients.
Technical Context
The LTC4381ADKE-1#PBF implements a multiplier-based fault timer that generates TMR pin current proportional to both VDS (via DRN pin resistor) and ID (via ΔVSNS), enabling dynamic MOSFET power dissipation monitoring. Its gate drive uses a regulated 20µA charge pump delivering 11.5V above OUT, clamped to 17V above OUT and 31.5V above GND (SEL = GND).
It features dual overvoltage protection: output clamping to 28.5V (SEL = GND) or 47V (SEL = VCC) referenced to GND, plus SRC clamping to 10.5V above VCC. Overcurrent protection maintains ΔVSNS at 50mV (OUT > 3V) or 62mV (OUT < 1.5V), with fault timing accelerated under high-stress conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V - supports cold-crank operation down to 4V in automotive 12V systems without external UVLO. |
| Quiescent Current (IQ) | 6µA typical - enables direct connection to vehicle battery for always-on applications with minimal standby drain. |
| MOSFET On-Resistance | 9mΩ typical - minimizes conduction loss and thermal rise at 1A continuous load (8.1mW dissipation). |
| Output Clamp Voltage | 28.5V (SEL = GND) - protects downstream 30V-rated components in 12V automotive systems against 100V load dump. |
| MOSFET Safe Operating Area | 20ms at 70V/1A - production-tested stress margin ensures reliability during sustained transients per ISO 7637-2 Pulse 5a. |
| Fault Response | Latch-off - requires manual reset via ON pin pulse (<100µs low) or power cycle; prevents uncontrolled auto-retry during persistent faults. |
| Reverse Input Protection | –60V - allows reverse-polarity connection tolerance without external diode, eliminating Schottky forward drop and heat. |
Pinout & Package
32-Lead DFN (7mm × 5mm) package with exposed thermal pad (Pin 33). Pin count and layout match industry-standard 32-pin DFN footprint for mechanical compatibility and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET Drain Terminal | High-side input connection; withstands up to 100V transient surges without external TVS. |
| SRC | MOSFET Source Terminal | Connects to current sense resistor; clamped to 28.5V above GND when SEL = GND. |
| OUT | Output Voltage Sense Reference | Low-impedance feedback node; requires ≥22µF local bypass for stability and transient response. |
| SNS | Current Sense Input | Monitors voltage across external sense resistor; regulates ΔVSNS to 50mV for precise current limiting. |
| GATE | Internal MOSFET Gate Driver Output | Regulated 11.5V above OUT; requires 47nF capacitor + 33Ω series resistor for amplifier compensation. |
| DRN | VDS Sense Input | Current proportional to MOSFET VDS; used with RDRN to scale TMR timer acceleration during overvoltage. |
| TMR | Fault Timer Integration Node | Capacitor-connected pin sets fault timeout and cool-down; charges to 1.215V to trigger latch-off. |
| FLT | Open-Drain Fault Indicator | Pulls low during fault; sinks up to 3mA; signals latched-off state until ON pin reset. |
| ON | Enable/Reset Control Input | 1.05V threshold; pull low <100µs to reset latch-off; tolerates –60V to +80V for robust system interfacing. |
| SEL | Clamp Voltage Select | GND → 28.5V clamp; VCC/OUT → 47V clamp; no effect on LTC4381-3/-4 variants. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 9mΩ MOSFET with SOA guarantee | Eliminates discrete FET selection and SOA validation effort; reduces BOM count and layout area by integrating pass element and driver. |
| 28.5V fixed output clamp (SEL = GND) | Directly protects 30V-rated downstream ICs (e.g., CAN transceivers, microcontrollers) in 12V automotive systems without external Zener networks. |
| Latch-off fault response | Prevents repeated cycling into fault conditions-critical for safety-critical subsystems where uncontrolled retry could escalate risk. |
| 6µA operating supply current | Enables permanent connection to vehicle battery without measurable impact on parasitic drain; meets OEM requirements for <20µA sleep mode. |
| –60V reverse input tolerance | Removes need for external reverse-polarity protection diode, saving 0.3–0.4V forward drop and associated heat dissipation in high-current paths. |
Applications
| Automotive Load Dump Protection | Industrial Power Rail Conditioning |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from 100V/400ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side eFuse providing voltage clamping, current limiting, and latch-off shutdown to isolate downstream circuitry during ISO 7637-2 Pulse 5a events. Use Value: Guarantees 28.5V clamped output using internal circuitry-no external Zener or TVS required-reducing component count and board space by ≥3 parts. | Use Scenario: Securing programmable logic controllers (PLCs) and industrial HMIs against 80V surge events on 24V DC power rails in factory automation environments. IC Role / Device Role / Timing Role: Standalone overvoltage/overcurrent protector with SOA-validated MOSFET, operating across –40°C to 125°C junction temperature range. Use Value: Withstands 70V/1A for 20ms without derating-enabling reliable operation in harsh environments where discrete solutions require complex thermal design. |
| Battery-Powered Always-On Systems | Avionics Surge Suppression |
Use Scenario: Power management for GPS trackers and telematics modules continuously connected to vehicle battery with <20µA sleep current budget. IC Role / Device Role / Timing Role: Low-IQ eFuse enabling direct battery tie with latch-off fault behavior to prevent runaway discharge during short circuits. Use Value: 6µA quiescent current ensures >10-year battery life in coin-cell or Li-SOCl₂ powered devices-verified across full temperature range. | Use Scenario: Protecting flight control sensors and communication interfaces from lightning-induced transients on 28V aircraft power buses. IC Role / Device Role / Timing Role: High-reliability surge suppressor with guaranteed SOA and reverse polarity tolerance up to –60V. Use Value: Eliminates need for dual-diode reverse protection and external clamp diodes-reducing failure points and meeting DO-160 Section 22 Level 3 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar eFuse protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4381ADKE-2#PBF | Same pinout and clamp voltages, but auto-retry fault behavior instead of latch-off; 2.8–4.2% retry duty cycle during overvoltage. | Suitable for non-safety-critical loads where automatic recovery after transient is acceptable (e.g., lighting, HVAC). | Select LTC4381ADKE-2#PBF only if system architecture permits unattended restart after fault; not suitable for fail-safe domains. |
| TPS26631PWPR | Lower 4.5V–60V input range; 42mΩ RON; no internal clamp-requires external TVS; 1.5ms fast trip vs. SOA-timed response. | Targeted at industrial 24V systems with shorter transients; lacks automotive load dump qualification and SOA guarantee. | Choose TPS26631PWPR for cost-sensitive 24V applications without 100V surge requirement; avoid for automotive 12V load dump use cases. |
Compared with LTC4381ADKE-2#PBF, the LTC4381ADKE-1#PBF provides deterministic latch-off behavior essential for safety-critical automotive subsystems, while TPS26631PWPR trades SOA validation and clamp integration for lower cost and smaller package-making it unsuitable for ISO 7637-2 compliance without added components.
Availability
LTC4381ADKE-1#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V rail conditioning, and battery-powered always-on systems requiring stable component supply with AEC-Q100 alignment and long-term lifecycle support.
Supply support for LTC4381ADKE-1#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 automotive, industrial, communications, and aerospace markets.
The LTC4381 product line delivers integrated eFuse solutions with SOA-validated MOSFETs and automotive-grade transient protection-designed specifically for robust, low-power, high-reliability power path management in harsh environments.
FAQ
What is the output clamp voltage setting for LTC4381ADKE-1#PBF?
The LTC4381ADKE-1#PBF has a fixed internal output clamp voltage of 28.5V when the SEL pin is connected to GND, and 47V when SEL is tied to VCC or OUT. This variant is configured for 28.5V clamping in standard 12V automotive applications, protecting downstream 30V-rated components without external components. The clamp is referenced to GND and production-tested for accuracy across temperature.
Does LTC4381ADKE-1#PBF require an external TVS diode on the input?
No, the LTC4381ADKE-1#PBF does not require an external TVS diode on the IN pin. Its absolute maximum rating supports 100V input surges, and its internal gate-clamp architecture limits output voltage to 28.5V (SEL = GND) during overvoltage events such as load dump. This eliminates the need for external TVS components in compliant 12V automotive designs, reducing BOM count and board area.
How does the fault response of LTC4381ADKE-1#PBF differ from LTC4381ADKE-2#PBF?
The LTC4381ADKE-1#PBF uses latch-off fault behavior: once tripped by overvoltage or overcurrent, it remains off until manually reset via a low pulse on the ON pin or power cycle. In contrast, LTC4381ADKE-2#PBF implements auto-retry with a controlled duty cycle (0.1–4.2%). This makes LTC4381ADKE-1#PBF appropriate for safety-critical systems where uncontrolled restart is prohibited.
What is the guaranteed safe operating area (SOA) specification for LTC4381ADKE-1#PBF?
The LTC4381ADKE-1#PBF guarantees a MOSFET safe operating area of 20ms at 70V and 1A, verified through production testing. This SOA rating ensures reliable operation during sustained transients like ISO 7637-2 Pulse 5a (100V/400ms), where the internal 9mΩ MOSFET remains within thermal and voltage limits without requiring external derating calculations.
Can LTC4381ADKE-1#PBF operate during automotive cold crank conditions?
Yes, the LTC4381ADKE-1#PBF operates through automotive cold crank down to 4V input, as specified in its 4V to 80V input voltage range. Its 6µA quiescent current and internal regulation allow uninterrupted function when battery voltage dips below 6V during engine start-ensuring continuous power to critical ECUs without brownout or reset.
LTC4381ADKE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LTC®4381
- Package/Case:
- 32-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Electronic Fuse
- Sensing Method:
- High-Side
- Accuracy:
- -
- Voltage - Input:
- 4V ~ 80V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (7x5)
LTC4381ADKE-1#PBF FAQ
1.How can I place an order for LTC4381ADKE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-1#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-1#PBF reliable?
The price and inventory of LTC4381ADKE-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-1#PBF?
LTC4381ADKE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-1#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-1#PBF?
For technical support, including LTC4381ADKE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-1#PBF requirements.
6.How does Aetrix verify that LTC4381ADKE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-1#PBF?
All LTC4381ADKE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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