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Analog Devices Inc. LTC4381ADKE-4#PBF
- Part No.:
- LTC4381ADKE-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-4#PBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:2,278
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Product details
Overview
LTC4381ADKE-4#PBF from Analog Devices is a low-quiescent-current eFuse IC with integrated 9mΩ N-channel MOSFET, fixed overvoltage clamp disable (adjustable via external Zener), auto-retry fault behavior, and guaranteed MOSFET safe operating area (20ms at 70V/1A). It operates from 4V to 72V input, draws only 6µA in active mode, and delivers robust load-dump protection for automotive 12V/24V systems.
For engineers reviewing the LTC4381ADKE-4#PBF datasheet, LTC4381ADKE-4#PBF pinout, LTC4381ADKE-4#PBF application, or LTC4381ADKE-4#PBF equivalent, key selection criteria include its adjustable output clamp architecture (no internal 28.5V/47V clamp), auto-retry latch recovery, reverse input protection to –60V, 32-lead DFN (7mm × 5mm) package, and compliance with automotive cold-crank (down to 4V).
Technical Context
The LTC4381ADKE-4#PBF implements an adaptive fault timer using TMR pin current proportional to MOSFET VDS × ID, enabling stress-dependent turn-off timing that enforces SOA compliance. Its GATE drive is regulated to VOUT + 11.5V (max 17V above OUT), with no internal ground-referenced output clamp - clamping is achieved solely via external Zener on VCC.
Unlike LTC4381-1/-2 variants, the LTC4381ADKE-4#PBF lacks SEL-pin-controlled 28.5V/47V clamps and instead relies on VCC clamping to set SRC voltage limit (VCC + 10.5V). It supports reverse input protection to –60V and features latchoff-to-auto-retry transition triggered by TMR capacitor discharge to 100mV after cool-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 72V - enables operation through automotive cold crank (≥4V) while limiting max surge handling to 100V via external VCC protection |
| Quiescent Current | 6µA typical - permits always-on battery-powered use without significant standby drain |
| MOSFET RON | 9mΩ typical - minimizes conduction loss and self-heating under 1A continuous load |
| Safe Operating Area | Guaranteed 20ms at 70V/1A - ensures survivability during 100V/400ms automotive load dump transients |
| Fault Response | Auto-retry with TMR-cool-down - automatically recovers after fault clearance without manual reset |
| Reverse Input Rating | –60V - supports bidirectional system architectures and protects against battery reversal |
| Package | 32-lead DFN (7mm × 5mm) - surface-mount footprint optimized for thermal dissipation and high-density PCB layouts |
Pinout & Package
32-lead plastic DFN (7mm × 5mm) with exposed pad (pin 33) for thermal management. θJA = 23°C/W. Pin 33 is electrically connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET drain input | Connects to upstream power source; withstands up to 100V transient surges |
| SRC | MOSFET source output | Drives load; clamped to VCC + 10.5V (no ground-referenced clamp) |
| OUT | Output voltage sense reference | Monitors load-side voltage; bypass with ≥22µF for stability |
| SNS | Current sense input | Measures voltage drop across external sense resistor; sets 50mV/62mV current limit threshold |
| GATE | Internal MOSFET gate driver | Regulated to VOUT + 11.5V (max 17V above OUT); requires 47nF/33Ω compensation |
| GFET | Internal MOSFET gate terminal | Connected to GATE via 10Ω resistor; not user-accessible as standalone control node |
| TMR | Fault timer integration node | Capacitor sets fault timeout and cool-down period; charges to 1.215V to trigger shutdown |
| FLT | Open-drain fault indicator | Pulls low during fault; releases high after auto-retry recovery or manual reset |
| ON | Enable/disable control | 1.05V threshold; open = enabled; <1V = shutdown (5µA ICC) |
| SEL | Clamp voltage select (no effect) | No function in LTC4381-4 variant; may be tied to GND/VCC/OUT without impact |
| VCC | Supply input (4V–72V) | Must be externally clamped (e.g., Zener) for >72V surges; defines SRC clamp level |
| DRN | VDS sense monitor | Current proportional to MOSFET VDS; used with RDRN to scale TMR fault current |
| GND | Device ground reference | Return path for all internal circuits; connects to exposed thermal pad (pin 33) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Clamp | Clamp voltage set exclusively by external Zener on VCC (e.g., 33V Zener → ~43.5V SRC clamp), enabling precise system-level voltage limiting |
| Auto-Retry Fault Recovery | After TMR cool-down, automatically re-enables MOSFET without PCB-level intervention - reduces need for service resets in inaccessible deployments |
| Reverse Input Protection | Withstands –60V on IN pin with ON/SEL grounded - eliminates need for external reverse-polarity diodes in battery-fed systems |
| Low 6µA Operating Current | Enables direct connection to vehicle battery for always-on telematics, ECU wake-up monitors, and infotainment standby rails |
| Guaranteed MOSFET SOA | Production-tested 20ms survival at 70V/1A - provides design margin against worst-case ISO 7637-2 pulse 5a/b load dump events |
Applications
| Automotive Load Dump Protection | Industrial Power Rail Conditioning |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS cameras from 100V/400ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side eFuse providing overvoltage clamping, overcurrent limiting, and adaptive fault timing to preserve downstream silicon. Use Value: Eliminates need for bulky TVS diodes and external current-sense amplifiers while maintaining 6µA quiescent draw for battery-sensitive modules. |
Use Scenario: Securing programmable logic controllers (PLCs) and industrial HMIs against 80V surges on 24V DC power buses. IC Role / Device Role / Timing Role: Adjustable-clamp eFuse enforcing strict output voltage limits via VCC Zener selection and real-time MOSFET stress monitoring. Use Value: Enables single-component protection for diverse 24V/48V systems without redesign - clamp voltage tuned per application via Zener choice. |
| Battery-Powered Telematics | Avionics Surge Suppression |
Use Scenario: Power management for GPS trackers and cellular modems in fleet vehicles with persistent battery connection. IC Role / Device Role / Timing Role: Always-on eFuse delivering reverse polarity protection, cold-crank operation down to 4V, and auto-recovery from intermittent shorts. Use Value: Extends battery life via 6µA IQ and avoids field failures due to latch-off behavior - critical for unattended remote devices. |
Use Scenario: Protecting flight data recorders and cockpit displays from lightning-induced transients on 28V aircraft buses. IC Role / Device Role / Timing Role: High-reliability eFuse with guaranteed SOA and –60V reverse rating meeting DO-160 Section 22 Level 3 requirements. Use Value: Replaces multi-component discrete solutions with AEC-Q100 qualified monolithic IC, reducing BOM count and qualification burden. |
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 | Includes internal 28.5V/47V ground-referenced output clamp; SEL pin functional | Preferred for 12V/24V systems requiring fixed clamp without external Zener design effort | Select when system-level clamp voltage is known and stable; avoids VCC Zener selection and layout |
| TPS26631RGER | Fixed 36V output clamp; no adjustable clamp or reverse input rating; 1.2A max continuous current | Targeted at lower-power industrial IoT nodes; lacks –60V reverse rating and 72V input range | Choose for cost-sensitive, non-automotive applications where 36V clamp suffices and reverse protection is unnecessary |
Compared with LTC4381ADKE-2#PBF and TPS26631RGER, the LTC4381ADKE-4#PBF trades fixed-clamp convenience for full adjustability and extended reverse voltage tolerance - making it optimal for ruggedized, variable-voltage, or safety-critical deployments where external Zener tuning and –60V resilience are mandatory.
Availability
LTC4381ADKE-4#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V/48V rail conditioning, and battery-powered telematics requiring stable component supply across extended temperature ranges (–40°C to 125°C).
Supply support for LTC4381ADKE-4#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 as a monolithic eFuse solution for harsh-environment power rail protection - specifically targeting automotive, avionic, and industrial systems demanding ultra-low IQ, guaranteed SOA, and flexible overvoltage response.
FAQ
What is the output clamp voltage of the LTC4381ADKE-4#PBF?
The LTC4381ADKE-4#PBF has no internal ground-referenced output clamp. Its SRC pin is clamped to VCC + 10.5V only. To set a specific output clamp voltage (e.g., 33V), a Zener diode must be placed between VCC and GND - the resulting clamp is approximately Zener voltage + 10.5V. This architecture enables precise, application-specific voltage limiting not possible with fixed-clamp variants like LTC4381ADKE-2#PBF.
Does the LTC4381ADKE-4#PBF support reverse input protection?
Yes, the LTC4381ADKE-4#PBF supports reverse input protection to –60V on the IN pin when ON and SEL are held at GND. This allows direct connection to vehicle batteries without external reverse-polarity diodes, eliminating forward voltage drop and associated power loss - a critical advantage for always-on telematics and ECU modules.
How does the fault recovery behavior of the LTC4381ADKE-4#PBF differ from latch-off versions?
The LTC4381ADKE-4#PBF implements auto-retry fault recovery: after the TMR capacitor discharges to 100mV during cool-down, the device automatically re-enables the MOSFET. In contrast, latch-off variants (e.g., LTC4381ADKE-3#PBF) remain off until ON is pulsed low for >100µs or power is cycled - making LTC4381ADKE-4#PBF ideal for unattended or remotely deployed systems.
What is the maximum input surge voltage the LTC4381ADKE-4#PBF can withstand?
The LTC4381ADKE-4#PBF is rated to withstand input surges up to 100V on the IN pin. However, its VCC pin operates only up to 72V (LTC4381-4 variant). Therefore, for surges exceeding 72V, VCC must be protected - typically with a Zener diode (e.g., 62V Zener) - to prevent damage while preserving the desired output clamp level via VCC + 10.5V regulation.
Can the LTC4381ADKE-4#PBF operate during automotive cold crank?
Yes, the LTC4381ADKE-4#PBF operates continuously down to 4V input, satisfying automotive cold-crank requirements. Its 6µA quiescent current ensures minimal battery drain during engine start-up, and its guaranteed SOA (20ms at 70V/1A) maintains protection integrity even as input voltage dips and recovers rapidly.
LTC4381ADKE-4#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-4#PBF FAQ
1.How can I place an order for LTC4381ADKE-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-4#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-4#PBF reliable?
The price and inventory of LTC4381ADKE-4#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-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-4#PBF?
LTC4381ADKE-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-4#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-4#PBF?
For technical support, including LTC4381ADKE-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-4#PBF requirements.
6.How does Aetrix verify that LTC4381ADKE-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-4#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-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-4#PBF?
All LTC4381ADKE-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-4#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-4#PBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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