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Analog Devices Inc. LTC4381ADKE-2#TRPBF
- Part No.:
- LTC4381ADKE-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-2#TRPBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
LTC4381ADKE-2#TRPBF 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. It delivers surge protection for automotive 12V systems against 100V load dump transients while enabling reverse input protection to –60V.
For engineers reviewing the LTC4381ADKE-2#TRPBF datasheet, LTC4381ADKE-2#TRPBF pinout, LTC4381ADKE-2#TRPBF application, or LTC4381ADKE-2#TRPBF equivalent, key selection considerations include its 6µA operating current, adjustable fault timer with MOSFET stress acceleration, latchoff vs. auto-retry configuration (this part = auto-retry), and compatibility with high-side switching in battery-powered always-on systems.
Technical Context
The LTC4381ADKE-2#TRPBF implements dual-protection architecture: overvoltage clamping is achieved by regulating GATE to limit SRC–OUT voltage to either 28.5V (SEL = GND) or 47V (SEL = VCC), while overcurrent limiting maintains ΔVSNS at 50mV (rising to 62mV during severe shorts). Its internal multiplier generates TMR pin current proportional to VDS × ID, dynamically shortening fault timeout under high MOSFET power dissipation.
It features a 20µA charge pump driving GATE to VOUT + 11.5V, with internal clamps limiting GATE–OUT to 17V and GATE–VCC to 13.5V. The auto-retry behavior (LTC4381-2 variant) uses a 15-cycle TMR cool-down sequence ending at 100mV before automatic restart - distinct from latchoff variants requiring ON-pin reset or power cycle.
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 use in always-on battery-powered applications with minimal standby drain. |
| MOSFET RON | 9mΩ typical - minimizes conduction loss and self-heating under 1A continuous load. |
| Output Clamp Voltage | Selectable 28.5V (SEL = GND) or 47V (SEL = VCC) - matches 12V or 24V/28V system rail requirements. |
| Fault Behavior | Auto-retry - automatically recovers after fault cool-down; no manual reset required. |
| SOA Guarantee | 20ms at 70V/1A - production-tested MOSFET stress margin for transient surge events like load dump. |
| Reverse Input Rating | –60V - enables robust reverse-polarity protection without external diodes. |
Pinout & Package
32-lead (7mm × 5mm) plastic DFN package with exposed pad (pin 33) for thermal management. Pin count and layout match industry-standard DFN-32 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET drain terminal | Connects to input supply; withstands up to 100V transient surges. |
| SRC | MOSFET source terminal | Connects to current-sense resistor; clamped to 28.5V/47V above GND (SEL-dependent). |
| OUT | Output voltage sense reference | Monitors load-side voltage; bypass with ≥22µF capacitor for stability. |
| SNS | Current sense input | Measures voltage drop across external sense resistor; sets 50mV/62mV current limit threshold. |
| GATE | Internal MOSFET gate driver output | Regulated to VOUT + 11.5V; requires 47nF cap + 33Ω series resistor for compensation. |
| GFET | Internal MOSFET gate connection | Internally connected to GATE via 10Ω resistor; not user-accessible. |
| DRN | VDS sense node | Current proportional to MOSFET VDS; used with RDRN to scale TMR fault timing. |
| TMR | Fault timer integrator | Capacitor-connected node; charges to 1.215V to trigger shutdown; controls auto-retry cool-down. |
| FLT | Open-drain fault indicator | Pulls low during fault; sinks up to 3mA; signals active protection state. |
| ON | Enable/disable control | 1.05V threshold; open = enabled via internal 1MΩ pull-up; <1µA leakage allows high-impedance control. |
| SEL | Clamp voltage select | GND = 28.5V clamp; VCC/OUT = 47V clamp - defines system voltage class compatibility. |
| VCC | IC bias supply | 4V–72V operating range; powers internal circuitry independently of IN/SRC path. |
| GND | Device ground reference | Common return for all analog and digital functions; connects to exposed thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 9mΩ MOSFET | Eliminates need for external pass FET and associated gate drive complexity in space-constrained designs. |
| Auto-retry fault recovery | Enables autonomous system recovery after transient overvoltage/overcurrent without host intervention. |
| Reverse input protection to –60V | Replaces Schottky diode solutions, removing forward voltage drop and thermal dissipation penalties. |
| Adjustable fault timer with stress acceleration | TMR current scales with VDS × ID, ensuring faster shutdown under high-power faults to preserve MOSFET SOA. |
| No input TVS required | Withstands 100V transients directly on IN pin - reduces BOM count and PCB area in surge-prone environments. |
Applications
| Automotive Load Dump Protection | High-Side Battery Switch |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 100V/400ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: eFuse controller with clamped output voltage and auto-retry behavior; acts as primary front-end protection stage. Use Value: Eliminates need for external TVS diodes and reduces system cost while maintaining compliance with ISO 7637-2 Pulse 5a. |
Use Scenario: Enabling controlled power-up of always-on subsystems (e.g., telematics, CAN gateway) from 12V battery with zero standby current penalty. IC Role / Device Role / Timing Role: High-side switch with 6µA quiescent current and cold-crank support down to 4V. Use Value: Extends battery life in parked vehicles; avoids voltage droop during engine start via undervoltage hysteresis on ON pin. |
| Avionic Power Conditioning | Industrial Hot-Swap Module |
|
Use Scenario: Safeguarding flight control interface boards against 80V surges in 28V aircraft power distribution networks. IC Role / Device Role / Timing Role: Overvoltage-clamped eFuse with 47V output setting (SEL = VCC); provides fail-safe isolation during bus transients. Use Value: Guarantees 20ms SOA at 70V/1A - exceeds DO-160 Section 22 Level 3 surge requirements without derating. |
Use Scenario: Inserting PCIe backplane modules into live 12V/24V industrial servers without disrupting upstream power rails. IC Role / Device Role / Timing Role: Inrush-limited high-side switch with programmable current limit and soft-start via GATE ramp control. Use Value: Limits inrush to <1A using IGATE(UP) × COUT/C2 equation - prevents brownouts during live insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar eFuse protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS26631PWPR | Lower 4.5V–60V input range; 12mΩ RON; fixed 36V clamp; no reverse input rating. | Targeted at 24V industrial PLCs; lacks –60V reverse protection and automotive cold-crank support. | Choose for cost-sensitive 24V systems where reverse polarity is externally managed and 100V surge immunity is not required. |
| MAX17613ATG+T | Wider 4.5V–65V range; 8.5mΩ RON; adjustable clamp via external resistor; 1.5µA IQ. | Requires external clamp circuitry; no built-in 28.5V/47V option; lacks guaranteed SOA test data. | Prefer when precise clamp voltage tuning is needed and board space allows discrete clamp components. |
Compared with TPS26631PWPR and MAX17613ATG+T, the LTC4381ADKE-2#TRPBF uniquely combines automotive-grade 100V surge tolerance, –60V reverse input rating, production-guaranteed SOA, and factory-configured auto-retry - making it optimal for safety-critical 12V/24V embedded systems where reliability under extreme transients is non-negotiable.
Availability
LTC4381ADKE-2#TRPBF is available at Aetrix Electronics and suitable for automotive ECU protection, avionic power conditioning, and industrial hot-swap applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LTC4381ADKE-2#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 eFuse protection in harsh automotive and avionic environments - emphasizing guaranteed SOA, reverse polarity resilience, and seamless integration of overvoltage/overcurrent response without external components.
FAQ
What is the key functional difference between LTC4381ADKE-2#TRPBF and LTC4381ADKE-1#TRPBF?
The LTC4381ADKE-2#TRPBF implements auto-retry fault behavior: after overvoltage or overcurrent shutdown, it automatically enters a cool-down period and restarts without external intervention. In contrast, the LTC4381ADKE-1#TRPBF latches off permanently until the ON pin is pulled low for >100µs or power is cycled. Both share identical 28.5V/47V clamp selection and 9mΩ MOSFET, but fault recovery strategy differs fundamentally.
How does the SEL pin configure the output clamp voltage on LTC4381ADKE-2#TRPBF?
On the LTC4381ADKE-2#TRPBF, the SEL pin selects between two fixed output clamp voltages: grounding SEL sets the clamp to 28.5V (optimized for 12V automotive systems), while connecting SEL to VCC or OUT sets it to 47V (for 24V/28V systems). This selection directly determines the SRC-to-GND clamping level and is validated across –40°C to 125°C.
Can LTC4381ADKE-2#TRPBF operate during automotive cold crank conditions?
Yes - the LTC4381ADKE-2#TRPBF operates continuously from 4V to 72V input, explicitly supporting cold crank down to 4V as confirmed in the datasheet. Its 6µA quiescent current ensures minimal battery drain, and the ON pin's 1.05V threshold with 45mV hysteresis maintains reliable enable/disable control even as battery voltage sags during engine start.
What external components are mandatory for stable operation of LTC4381ADKE-2#TRPBF?
Three components are mandatory: (1) ≥22µF capacitor at OUT (placed close to the pin), (2) 47nF capacitor + 33Ω series resistor at GATE for current-limit amplifier compensation, and (3) timing capacitor CTMR at TMR to set fault timeout and cool-down duration. Omitting any compromises overcurrent response, gate stability, or auto-retry timing accuracy.
Does LTC4381ADKE-2#TRPBF require an input TVS diode for 100V surge protection?
No - the LTC4381ADKE-2#TRPBF is rated for 100V absolute maximum on the IN pin and has been production-tested to withstand 100V/400ms load dump transients without failure. Its internal architecture eliminates the need for external TVS diodes, reducing BOM cost and PCB area while maintaining full surge immunity per ISO 7637-2.
LTC4381ADKE-2#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-2#TRPBF FAQ
1.How can I place an order for LTC4381ADKE-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-2#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-2#TRPBF reliable?
The price and inventory of LTC4381ADKE-2#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-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-2#TRPBF?
LTC4381ADKE-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-2#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-2#TRPBF?
For technical support, including LTC4381ADKE-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-2#TRPBF requirements.
6.How does Aetrix verify that LTC4381ADKE-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-2#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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-2#TRPBF?
All LTC4381ADKE-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-2#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-2#TRPBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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