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Analog Devices Inc. LTC4381ADKE-1#TRPBF
- Part No.:
- LTC4381ADKE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-1#TRPBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:4,114
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Product details
Overview
LTC4381ADKE-1#TRPBF from Analog Devices is a low-quiescent-current eFuse IC featuring an integrated 9mΩ N-channel MOSFET, fixed 28.5V output clamp (SEL = GND), latchoff fault behavior, and guaranteed MOSFET safe operating area of 20ms at 70V/1A. It delivers surge protection for automotive 12V systems against 100V load dump transients while enabling reverse input protection down to –60V.
For engineers reviewing the LTC4381ADKE-1#TRPBF datasheet, LTC4381ADKE-1#TRPBF pinout, LTC4381ADKE-1#TRPBF application, or LTC4381ADKE-1#TRPBF equivalent, key selection criteria include its 6µA operating current, 4V–80V input range, 32-lead DFN (7mm × 5mm) package, latchoff response to overvoltage/overcurrent faults, and compatibility with cold-crank automotive environments.
Technical Context
The LTC4381ADKE-1#TRPBF implements a dual-protection architecture: overvoltage clamping via internal gate voltage regulation (28.5V output clamp when SEL = GND) and overcurrent limiting via ΔVSNS sensing (50mV threshold, rising to 62mV under severe short). Its TMR pin integrates a power-dissipation-dependent current (proportional to VDS × ID) to dynamically shorten fault timeout during high-stress events.
It uses a 20µA charge pump to drive the internal MOSFET gate to VOUT + 11.5V, with internal clamps limiting GATE–OUT to 17V and GATE–VCC to 13.5V. Fault detection triggers FLT low at TMR = 1.215V; unlike auto-retry variants, this part latches off and requires ON pin reset (≥100µs low pulse) or power cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V - supports automotive cold crank (down to 4V) and withstands up to 100V transient surges on IN pin. |
| Quiescent Current | 6µA typical - enables always-on battery-powered operation without significant standby drain. |
| MOSFET RON | 9mΩ typical - minimizes conduction loss and self-heating in high-current paths (e.g., 1A load → 9mW dissipation). |
| Output Clamp Voltage | 28.5V (fixed, SEL = GND) - protects downstream 30V-rated components in 12V automotive systems during load dump. |
| SOA Guarantee | 20ms at 70V/1A - production-tested safe operating area ensures reliability under sustained high-voltage transients. |
| Fault Response | Latchoff - disables output until manual reset via ON pin; prevents uncontrolled cycling during persistent faults. |
| Reverse Input Protection | –60V - allows reverse-polarity connection without damage, eliminating need for external Schottky diode. |
Pinout & Package
Package: 32-lead DFN (7mm × 5mm), exposed pad (pin 33), rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET Drain Input | Connects to supply rail; handles up to 100V transient; source of pass element. |
| SRC | MOSFET Source Output | Connects to current sense resistor; clamped to 28.5V above GND (SEL = GND) for overvoltage protection. |
| SNS | Current Sense Input | Monitors voltage drop across external sense resistor; sets 50mV current limit threshold. |
| OUT | Output Voltage Sense | Reference point for SNS and GATE regulation; bypass with ≥22µF capacitor for stability. |
| GATE | Internal MOSFET Gate Driver | Driven by 20µA charge pump to VOUT + 11.5V; clamped to 17V above OUT to prevent MOSFET overdrive. |
| DRN | VDS Sense Terminal | Current proportional to MOSFET VDS; feeds TMR multiplier for dynamic SOA timing. |
| TMR | Fault Timer Integration Node | Capacitor-based timer; charges to 1.215V to trigger latchoff; no auto-restart. |
| FLT | Open-Drain Fault Indicator | Pulls low during fault; sinks up to 3mA; signals latchoff condition to system controller. |
| ON | Enable/Reset Control | 1.05V threshold; pull low ≥100µs to reset latched fault; supports undervoltage detection. |
| SEL | Clamp Voltage Select | GND = 28.5V clamp; VCC/OUT = 47V clamp - configures protection level for 12V vs 24V systems. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 9mΩ N-Channel MOSFET | Eliminates external pass FET and associated gate drive complexity; reduces BOM count and layout area. |
| 28.5V Fixed Output Clamp (SEL = GND) | Matches 30V-rated downstream ICs in 12V automotive applications; avoids need for external TVS diodes. |
| 6µA Operating Quiescent Current | Enables direct connection to vehicle battery for always-on modules (e.g., telematics, alarm systems) without excessive drain. |
| Latchoff Fault Behavior | Prevents uncontrolled re-engagement during persistent overvoltage/overcurrent; requires explicit system-level reset. |
| –60V Reverse Input Tolerance | Supports reverse-battery connection immunity without external diode, reducing forward voltage drop and heat generation. |
| Guaranteed 20ms SOA at 70V/1A | Production-tested stress margin ensures robustness against real-world automotive load dump profiles per ISO 7637-2. |
Applications
| Automotive Load Dump Protection | Always-On Battery-Powered Systems |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from 100V/400ms load dump transients in 12V vehicles. IC Role / Device Role / Timing Role: High-side eFuse providing voltage clamping, current limiting, and latchoff fault isolation. Use Value: Replaces discrete TVS + MOSFET + controller solutions; eliminates need for input TVS diode due to internal 28.5V clamp. |
Use Scenario: Power management for GPS trackers and remote keyless entry modules connected directly to car battery. IC Role / Device Role / Timing Role: Low-IQ high-side switch enabling >1-year battery life in sleep mode. Use Value: 6µA quiescent current extends coin-cell or Li-ion battery life; reverse-input tolerance prevents damage during service disconnect. |
| Avionic/Industrial Surge Protection | Hot-Swap Power Distribution |
Use Scenario: Securing avionics power inputs against lightning-induced surges up to 100V in 28V aircraft systems. IC Role / Device Role / Timing Role: Transient-hardened eFuse with guaranteed SOA and latchoff behavior for safety-critical shutdown. Use Value: 20ms SOA guarantee at 70V/1A meets DO-160 Section 22 Level 3 surge requirements without derating. |
Use Scenario: Controlled power-up of field-replaceable modules in telecom base stations or industrial PLC backplanes. IC Role / Device Role / Timing Role: Inrush-limited high-side switch with programmable turn-on delay and fault latching. Use Value: Soft-start via GATE ramp control limits inrush current; latchoff prevents retry during connector mating faults. |
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#TRPBF | Same 28.5V clamp, but auto-retry fault behavior (cool-down + restart) instead of latchoff. | Suitable where automatic recovery after transient faults is required (e.g., non-safety-critical peripherals). | Select when system firmware can handle repeated fault cycles; avoid in safety-critical latch-required designs. |
| TPS26631RGER | 4.5V–60V input, 1.2A max, 28V fixed clamp, 25µA IQ, 16-pin WQFN; no reverse-input rating. | Lacks –60V reverse tolerance and guaranteed SOA; lower voltage rating limits use in 72V industrial systems. | Choose for cost-sensitive, lower-voltage applications where reverse polarity is controlled externally. |
Compared with LTC4381ADKE-1#TRPBF, the LTC4381ADKE-2#TRPBF offers automatic recovery but sacrifices deterministic fault containment, while the TPS26631RGER trades SOA guarantee and reverse rating for smaller footprint and lower cost in less demanding environments.
Availability
LTC4381ADKE-1#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, always-on battery systems, avionic surge hardening, and hot-swap power distribution requiring stable component supply across extended temperature and lifecycle conditions.
Supply support for LTC4381ADKE-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, 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 product line delivers integrated eFuse solutions with ultra-low quiescent current and production-guaranteed SOA for mission-critical surge and overload protection in harsh automotive and industrial environments.
FAQ
What is the output clamp voltage configuration for LTC4381ADKE-1#TRPBF?
The LTC4381ADKE-1#TRPBF has a fixed 28.5V output clamp voltage when the SEL pin is connected to GND. This configuration is factory-trimmed and cannot be adjusted; it is optimized for 12V automotive systems to protect 30V-rated downstream components during load dump events. The LTC4381ADKE-1#TRPBF does not support adjustable clamping - only the -3 and -4 variants do.
Does LTC4381ADKE-1#TRPBF support reverse input voltage protection?
Yes, LTC4381ADKE-1#TRPBF supports reverse input voltage protection down to –60V on the IN pin. This is achieved through internal circuitry that blocks reverse current flow without requiring an external Schottky diode, thereby eliminating forward voltage drop and associated power loss. The specification is validated across the full –40°C to +125°C temperature range.
How does the fault response of LTC4381ADKE-1#TRPBF differ from auto-retry versions?
LTC4381ADKE-1#TRPBF implements latchoff fault behavior: upon overvoltage or overcurrent detection, it shuts off the MOSFET and holds the FLT pin low until manually reset by pulling the ON pin below 1.05V for ≥100µs or cycling power. Unlike LTC4381ADKE-2#TRPBF, it does not auto-retry, ensuring deterministic fault containment in safety-critical applications.
What is the guaranteed safe operating area (SOA) for LTC4381ADKE-1#TRPBF?
The LTC4381ADKE-1#TRPBF guarantees a MOSFET safe operating area of 20ms at 70V and 1A - a production-tested specification ensuring reliable operation under sustained high-voltage transients such as ISO 7637-2 Pulse 5a load dump. This SOA rating is explicitly verified per device lot and applies across the full –40°C to +125°C operating temperature range.
Can LTC4381ADKE-1#TRPBF operate during automotive cold crank conditions?
Yes, LTC4381ADKE-1#TRPBF operates through automotive cold crank down to 4V input voltage. Its wide 4V–80V input range and 6µA quiescent current allow continuous functionality when battery voltage dips during engine start, provided VCC remains above 8V during the crank period - a condition met when VCC is powered from a regulated 12V rail.
LTC4381ADKE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LTC®4381
- Package/Case:
- 32-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC4381ADKE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-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 LTC4381ADKE-1#TRPBF reliable?
The price and inventory of LTC4381ADKE-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 LTC4381ADKE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-1#TRPBF?
LTC4381ADKE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-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 LTC4381ADKE-1#TRPBF?
For technical support, including LTC4381ADKE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-1#TRPBF requirements.
6.How does Aetrix verify that LTC4381ADKE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-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 LTC4381ADKE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-1#TRPBF?
All LTC4381ADKE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-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 LTC4381ADKE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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