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Analog Devices Inc. LTC4381ADKE-4#TRPBF
- Part No.:
- LTC4381ADKE-4#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-4#TRPBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
LTC4381ADKE-4#TRPBF from Analog Devices is a low-quiescent-current eFuse IC with integrated 9mΩ N-channel MOSFET, fixed overvoltage clamp disable (adjustable clamp mode), auto-retry fault response, and guaranteed MOSFET safe operating area (20ms at 70V/1A). It operates from 4V to 72V input, draws only 6µA in active state, and delivers automotive-grade load dump protection for 12V/24V/48V systems.
For engineers reviewing the LTC4381ADKE-4#TRPBF datasheet, LTC4381ADKE-4#TRPBF pinout, LTC4381ADKE-4#TRPBF application, or LTC4381ADKE-4#TRPBF equivalent, this page provides verified functional context, validated pin-level circuit roles, confirmed SOA and clamp behavior for adjustable-mode operation, and real-world selection guidance against comparable eFuse alternatives.
Technical Context
The LTC4381ADKE-4#TRPBF implements an internal multiplier-based fault timer that integrates TMR pin current proportional to both VDS (via DRN pin resistor) and ID (via ΔVSNS), enabling dynamic MOSFET stress acceleration during high-power faults. Its GATE drive is regulated to VOUT + 11.5V, with no internal ground-referenced output clamp - requiring external Zener clamping at VCC to set output voltage limit.
As the -4 variant, it supports externally adjustable output clamp voltage (via VCC Zener), auto-retry fault recovery (cool-down followed by automatic restart), reverse input protection to –60V, and operates across –40°C to 125°C. Unlike -1/-2 variants, SEL pin is inactive; clamp voltage is determined solely by VCC regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 72V - supports cold-crank operation down to 4V in automotive systems without dropout. |
| Quiescent Current | 6µA typical - enables always-on battery-powered applications with minimal standby drain. |
| MOSFET RON | 9mΩ max - limits conduction loss to <90mW at 1A, reducing thermal burden in compact layouts. |
| SOA Guarantee | 20ms at 70V/1A - production-tested safe operating area ensures robustness during 100V/400ms load dump transients. |
| Fault Response | Auto-retry with cool-down - TMR capacitor sets both fault timeout and thermal recovery interval; no manual reset required. |
| Reverse Input Rating | –60V - enables bidirectional surge protection without external diodes or back-to-back FETs. |
| Package | 32-lead DFN (7mm × 5mm) - exposes thermal pad for efficient PCB heat dissipation in high-stress protection circuits. |
Pinout & Package
Package: 32-lead (7mm × 5mm) plastic DFN with exposed thermal pad (Pin 33). Designed for high-power dissipation in space-constrained automotive and industrial protection modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET drain terminal | High-side input connection; withstands up to 100V transient surges; directly interfaces with battery or supply rail. |
| SRC | MOSFET source terminal | Connects to current-sense resistor; output voltage referenced to this node; clamped to VCC + 10.5V only. |
| OUT | Output voltage sense reference | Monitors load-side voltage; bypassed with ≥22µF capacitor; internal clamp between GATE and OUT limits to 17V. |
| SNS | Current sense input | Measures voltage drop across external sense resistor; regulates ΔVSNS to 50mV (62mV under severe short). |
| GATE | Internal MOSFET gate driver | Regulated to VOUT + 11.5V; requires 47nF capacitor + 33Ω series resistor for stability; clamped to VOUT + 17V. |
| GFET | Internal MOSFET gate connection | Direct tie to GATE via 10Ω resistor; isolates gate drive loop from noise-sensitive analog sections. |
| DRN | VDS sense node | Current proportional to MOSFET VDS; used with RDRN to feed multiplier for stress-accelerated fault timing. |
| TMR | Fault timer integrator | Capacitor-connected node; charges to 1.215V to trigger shutdown; cools down before auto-restart in -4 variant. |
| FLT | Open-drain fault indicator | Pulls low during fault; sinks up to 3mA; signals MOSFET off-state to system controller or status LED. |
| ON | Enable/disable control | 1.05V threshold; internal 1MΩ pull-up enables default-on operation; supports undervoltage lockout and remote reset. |
| SEL | Clamp voltage select (inactive) | No function in LTC4381ADKE-4#TRPBF; may be tied to GND, VCC, or left floating without effect. |
| VCC | Supply input for internal circuitry | 4V–72V range; must be Zener-clamped to set output clamp voltage (e.g., 24V Zener → ~34.5V clamp at SRC). |
| GND | Device ground reference | Common return for all analog and power paths; connects to exposed thermal pad for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output clamp via VCC Zener | Enables precise output voltage limiting (e.g., 24V clamp using 13.5V Zener at VCC) without redesigning feedback networks. |
| Auto-retry fault recovery | Eliminates need for external microcontroller intervention after overvoltage/overcurrent events; reduces system downtime. |
| Guaranteed MOSFET SOA | 20ms at 70V/1A rating ensures reliable operation during worst-case automotive load dump per ISO 7637-2 Pulse 5a. |
| Reverse input protection to –60V | Prevents damage from battery reversal or negative transients without adding Schottky diodes or dual-MOSFET solutions. |
| Low 6µA quiescent current | Extends battery life in always-on telematics, ADAS sensors, and infotainment modules with persistent power requirements. |
| Integrated 9mΩ MOSFET | Reduces BOM count and layout area versus discrete eFuse designs; eliminates gate driver complexity and matching issues. |
Applications
| Automotive Load Dump Protection | Industrial Power Rail Protection |
|---|---|
|
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 with adjustable clamp and auto-retry, acting as primary overvoltage barrier upstream of DC/DC converters. Use Value: Eliminates need for bulky TVS diodes while maintaining <28.5V clamping accuracy and surviving repeated load dump cycles per ISO 16750-2. |
Use Scenario: Securing programmable logic controllers (PLCs) and motor drives against 80V+ surges on 24V industrial power rails. IC Role / Device Role / Timing Role: Adjustable-voltage eFuse with SOA-guaranteed MOSFET, providing scalable overvoltage cutoff without custom clamp design. Use Value: Enables single-part support for multiple rail voltages (24V/48V) via VCC Zener selection, reducing inventory and qualification effort. |
| Battery-Powered Telematics | Avionics Surge Suppression |
|
Use Scenario: Power management in GPS trackers and fleet monitoring devices requiring ultra-low standby current and cold-crank resilience. IC Role / Device Role / Timing Role: Always-on eFuse with 6µA IQ and 4V start-up, serving as main power switch and fault monitor. Use Value: Extends lithium-thionyl chloride battery life beyond 10 years in sealed deployments while ensuring fault-safe shutdown. |
Use Scenario: Protecting flight control interface modules from lightning-induced transients on 28V aircraft power buses. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage protector with –60V rating and 100V surge tolerance, placed at board edge. Use Value: Meets DO-160 Section 22 Level 3 surge requirements without external crowbar circuits or redundant protection layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar eFuse protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS26631RGER | Fixed 36V clamp, 4.5V–60V input, 1.2A max, no adjustable clamp, lower IQ (1.5µA), no reverse input rating | Best for cost-sensitive 24V industrial systems where clamp voltage is fixed and reverse polarity is not required | Select when lowest standby power and simple fixed-clamp behavior outweigh need for automotive surge robustness and reverse protection |
| MAX17613ATG+T | 4.5V–60V input, 1.5A, adjustable clamp (0.6V reference), 13mΩ RON, –20V reverse rating, 12µA IQ | Suitable for space-constrained 24V embedded systems needing fine-tuned current limit but less demanding SOA validation | Choose when precise current limit tuning is critical and 20ms/70V SOA guarantee is not mandated by safety standard |
Compared with TPS26631RGER and MAX17613ATG+T, the LTC4381ADKE-4#TRPBF uniquely combines guaranteed 20ms/70V SOA, –60V reverse input capability, and true adjustable clamp via VCC Zener - making it the only option qualified for repeatable automotive load dump survival and bidirectional rail integrity.
Availability
LTC4381ADKE-4#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V/48V power rail hardening, and battery-powered telematics requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC4381ADKE-4#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC4381 family was designed specifically for robust, low-IQ electronic fuse protection in harsh automotive and industrial environments - emphasizing guaranteed SOA, adjustable clamping, and seamless integration of reverse polarity and surge resilience.
FAQ
What is the output clamp voltage configuration for LTC4381ADKE-4#TRPBF?
The LTC4381ADKE-4#TRPBF has no internal ground-referenced output clamp; its clamp voltage is fully adjustable via external Zener diode on the VCC pin. For example, a 24V Zener at VCC yields ~34.5V clamp at SRC (VCC + 10.5V), enabling precise rail-specific protection without changing the LTC4381ADKE-4#TRPBF itself.
Does LTC4381ADKE-4#TRPBF support reverse input voltage protection?
Yes, LTC4381ADKE-4#TRPBF supports reverse input protection to –60V on the IN pin. This is achieved through internal circuitry that blocks reverse current flow without requiring external diodes or back-to-back MOSFETs - reducing voltage drop, heat generation, and PCB area compared to discrete solutions.
How does the fault timer behave during overvoltage events in LTC4381ADKE-4#TRPBF?
In LTC4381ADKE-4#TRPBF, the fault timer accelerates based on MOSFET power dissipation (VDS × ID). During overvoltage, DRN pin current scales with VDS, increasing TMR charging rate. When TMR reaches 1.215V, the MOSFET shuts off and FLT pulls low; then TMR enters cool-down (2µA discharge) before automatic restart - no manual reset needed.
What is the guaranteed safe operating area (SOA) for LTC4381ADKE-4#TRPBF?
The LTC4381ADKE-4#TRPBF guarantees MOSFET SOA of 20ms at 70V and 1A - a production-tested specification ensuring survivability during worst-case automotive load dump transients (e.g., ISO 7637-2 Pulse 5a). This rating applies across the full –40°C to 125°C junction temperature range.
Can LTC4381ADKE-4#TRPBF operate during automotive cold crank?
Yes, LTC4381ADKE-4#TRPBF operates continuously down to 4V input, meeting automotive cold-crank requirements. Its 6µA quiescent current and wide 4V–72V input range allow uninterrupted function even when battery voltage dips below 6V - critical for engine-start reliability in telematics and body control modules.
LTC4381ADKE-4#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4381ADKE-4#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-4#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 LTC4381ADKE-4#TRPBF reliable?
The price and inventory of LTC4381ADKE-4#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-4#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-4#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-4#TRPBF?
LTC4381ADKE-4#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-4#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 LTC4381ADKE-4#TRPBF?
For technical support, including LTC4381ADKE-4#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-4#TRPBF requirements.
6.How does Aetrix verify that LTC4381ADKE-4#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-4#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 LTC4381ADKE-4#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-4#TRPBF?
All LTC4381ADKE-4#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-4#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 LTC4381ADKE-4#TRPBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-4#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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