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Analog Devices Inc. LTC4381ADKE-3#TRPBF
- Part No.:
- LTC4381ADKE-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Current Regulation/Management
- Package:
- 32-WFDFN Exposed Pad
- Datasheet:
-
LTC4381ADKE-3#TRPBF.pdf
- Description:
- LOW ICC, 1A SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:2,420
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Product details
Overview
LTC4381ADKE-3#TRPBF from Analog Devices is a low-quiescent-current eFuse IC with integrated 9mΩ N-channel MOSFET, fixed latchoff fault behavior, and externally adjustable output clamp voltage. It operates from 4V to 72V input, delivers ≤6µA operating supply current, and provides overvoltage protection up to 100V surge - designed for automotive load dump protection in 12V/24V/48V systems.
For engineers reviewing the LTC4381ADKE-3#TRPBF datasheet, LTC4381ADKE-3#TRPBF pinout, LTC4381ADKE-3#TRPBF application, or LTC4381ADKE-3#TRPBF equivalent, key selection criteria include its adjustable clamp architecture (no internal 28.5V/47V clamps), latchoff-only fault response, guaranteed SOA (20ms at 70V/1A), reverse input protection to –60V, and DFN-32 (7mm × 5mm) package with exposed thermal pad.
Technical Context
The LTC4381ADKE-3#TRPBF implements a 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 overvoltage or overcurrent events. Its gate drive is regulated to VOUT + 11.5V, with no GATE-to-GND clamp - relying solely on VCC + 10.5V SRC clamping and external Zener control of output voltage.
Unlike LTC4381-1/-2 variants, the LTC4381ADKE-3#TRPBF lacks internal 28.5V/47V output clamps to ground; instead, it requires external Zener diode clamping at VCC to set output clamp voltage between 14.5V and 72V. Fault response is strictly latchoff: MOSFET remains off after TMR reaches 1.215V until ON pin is pulsed low ≥100µs or power is cycled.
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 brownout. |
| Quiescent Current | 6µA typical at 12V - enables always-on battery-powered applications with minimal standby drain. |
| MOSFET RON | 9mΩ max at 12V - limits conduction loss to <120mW at 1A, reducing thermal design burden. |
| Safe Operating Area | Guaranteed 20ms at 70V/1A - production-tested MOSFET stress margin for load dump transients. |
| Output Clamp Method | Externally adjustable via VCC Zener - enables precise clamp setting (e.g., 36V, 42V) without internal fixed thresholds. |
| Fault Response | Latchoff only - requires active reset (ON pin pulse or power cycle); no auto-retry behavior. |
| Reverse Input Rating | –60V - protects against battery reversal or negative transients without external diodes. |
Pinout & Package
Package: 32-lead DFN (7mm × 5mm), exposed thermal pad (Pin 33), RoHS-compliant, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | MOSFET drain terminal | Connects to high-side input rail; withstands 100V transient surges. |
| SRC | MOSFET source terminal | Drives load through external sense resistor; clamped to VCC + 10.5V only (no GND clamp). |
| SNS | Current sense input | Monitors voltage drop across sense resistor; regulates ΔVSNS to 50mV (62mV under severe short). |
| OUT | Output voltage sense | Reference point for SNS, GATE, and DRN; bypassed with ≥22µF ceramic capacitor. |
| GATE | Internal MOSFET gate driver | Regulated to VOUT + 11.5V; requires 47nF cap + 33Ω series resistor for stability. |
| DRN | VDS sense node | Current proportional to MOSFET VDS; used with RDRN to scale TMR timer current. |
| TMR | Fault timer integrator | Capacitor sets fault timeout and cool-down; threshold = 1.215V; no auto-restart in -3 variant. |
| ON | Enable/reset control | 1.05V threshold; pulsed low ≥100µs resets latched fault condition. |
| FLT | Open-drain fault indicator | Pulls low during fault; high-Z otherwise; sinks up to 3mA. |
| VCC | IC supply input | 4V–72V range; must be Zener-clamped for adjustable output voltage control. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output clamp | Enabled by external Zener on VCC - supports custom clamp voltages from 14.5V to 72V without internal fixed options. |
| Latchoff-only fault handling | Eliminates uncontrolled retry cycles during persistent faults - critical for safety-critical automotive subsystems. |
| Reverse input protection | Withstands –60V on IN pin - removes need for external Schottky diode and associated forward drop/dissipation. |
| Low 6µA operating current | Enables direct connection to vehicle battery without auxiliary regulators - extends sleep-mode runtime. |
| Guaranteed MOSFET SOA | 20ms at 70V/1A validated in production - ensures robustness against ISO 7637-2 Pulse 5a/b load dump events. |
| No input TVS required | 100V surge tolerance on IN pin - reduces BOM count and PCB area vs. discrete TVS + eFuse solutions. |
Applications
| Automotive Load Dump Protection | Industrial Power Rail Conditioning |
|---|---|
|
Use Scenario: Protecting infotainment ECUs from 100V/400ms load dump transients in 12V vehicles. IC Role / Device Role / Timing Role: High-side eFuse with adjustable clamp and latchoff response - blocks overvoltage before reaching downstream LDOs or processors. Use Value: Eliminates need for 100V-rated input capacitors and external TVS, reducing cost and footprint by >30% vs. discrete solutions. |
Use Scenario: Securing programmable logic controllers (PLCs) against 80V surges on 24V DC power rails. IC Role / Device Role / Timing Role: Adjustable-clamp eFuse with guaranteed SOA - sustains 70V/1A for 20ms while limiting energy delivered to sensitive FPGA or ADC circuitry. Use Value: Enables use of standard 36V-rated downstream components instead of 100V-rated alternatives, lowering system BOM cost. |
| Avionics Power Sequencing | Battery-Powered Telematics |
|
Use Scenario: Isolating mission-critical avionics modules during 28V aircraft bus transients. IC Role / Device Role / Timing Role: Latchoff eFuse with –60V reverse input rating - prevents backfeed and damage during dual-battery hot-swap events. Use Value: Replaces dual-MOSFET reverse protection + TVS + fuse with single IC, improving reliability and reducing failure modes. |
Use Scenario: Enabling always-on GPS tracking units powered by 12V lead-acid batteries. IC Role / Device Role / Timing Role: Ultra-low-IQ (6µA) eFuse with cold-crank support down to 4V - maintains protection during engine start without draining battery. Use Value: Extends battery life by >2× vs. conventional eFuses with 20–50µA quiescent current, enabling 3+ year maintenance-free operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar eFuse applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4381ADKE-1#TRPBF | Fixed 28.5V/47V output clamps to GND; same latchoff behavior. | Predefined clamp voltages simplify design for standard 12V/24V systems but lack flexibility for custom thresholds. | Select when clamp voltage matches standard automotive rails and external Zener is undesirable. |
| LTC4381IDKE-3#TRPBF | Same functionality and pinout, but rated for –40°C to +125°C industrial temp range (vs. A-grade –40°C to +125°C). | No functional difference; I-grade offers extended qualification testing for harsh environments. | Select when full AEC-Q100 Grade 1 compliance or extended reliability validation is required. |
Compared with LTC4381ADKE-1#TRPBF, the LTC4381ADKE-3#TRPBF trades fixed clamp simplicity for design flexibility via external Zener control - essential for non-standard rail voltages. Compared with LTC4381IDKE-3#TRPBF, it shares identical electrical performance but targets cost-sensitive automotive applications where full I-grade qualification is unnecessary.
Availability
LTC4381ADKE-3#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V/48V power conditioning, and battery-powered telematics requiring stable component supply with guaranteed long-term availability.
Supply support for LTC4381ADKE-3#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 robust surge protection - specifically engineered for automotive and industrial power rail integrity in harsh electromagnetic environments.
FAQ
What is the output clamp voltage configuration for LTC4381ADKE-3#TRPBF?
The LTC4381ADKE-3#TRPBF has no internal output clamp to ground. Its output clamp voltage is set externally by placing a Zener diode between VCC and GND - the clamp voltage equals the Zener voltage plus 10.5V (SRC-to-VCC clamp offset). This allows precise adjustment from 14.5V to 72V, unlike the fixed 28.5V/47V options in LTC4381-1/-2 variants. The LTC4381ADKE-3#TRPBF datasheet specifies VCC operating range as 4V to 72V, so Zener selection must keep VCC within this limit.
Does LTC4381ADKE-3#TRPBF support auto-retry after a fault?
No. The LTC4381ADKE-3#TRPBF implements latchoff-only fault behavior: once the TMR pin reaches 1.215V due to overvoltage or overcurrent, the MOSFET turns off and remains off indefinitely. Recovery requires either pulsing the ON pin low for ≥100µs or cycling power. This differs from LTC4381-2/-4 variants, which feature auto-retry with controlled duty cycle. The LTC4381ADKE-3#TRPBF design prioritizes deterministic fault containment over automatic recovery.
How is reverse input protection implemented in LTC4381ADKE-3#TRPBF?
The LTC4381ADKE-3#TRPBF supports reverse input protection to –60V on the IN pin without external components. When IN is driven negative, internal circuitry blocks reverse current flow through the integrated MOSFET body diode, preventing damage to downstream circuitry and eliminating the need for external Schottky diodes. This capability is confirmed in the Absolute Maximum Ratings table and verified across the –40°C to +125°C temperature range. The LTC4381ADKE-3#TRPBF achieves this using dedicated reverse-bias protection circuitry tied to the GATE and GFET pins.
What is the minimum recommended TMR capacitor value for LTC4381ADKE-3#TRPBF?
A minimum 100nF X7R ceramic capacitor is recommended for the TMR pin of LTC4381ADKE-3#TRPBF to ensure reliable startup and fault timing. During initial power-up, the TMR capacitor must absorb the 1.5µA pilot current while VDS > 0.7V, then discharge via 2µA during normal operation. Undersized capacitors (<100nF) risk premature fault triggering during inrush. The LTC4381ADKE-3#TRPBF datasheet recommends 10V-rated X7R dielectrics to minimize voltage and temperature drift across the full operating range.
Can LTC4381ADKE-3#TRPBF operate during automotive cold crank?
Yes. The LTC4381ADKE-3#TRPBF operates continuously from 4V to 72V input, explicitly supporting automotive cold crank conditions where battery voltage dips to 4V. Its 6µA quiescent current ensures minimal additional load on the cranking battery, and its internal MOSFET RON of 9mΩ maintains low conduction loss even at low VIN. The LTC4381ADKE-3#TRPBF is specified for –40°C to +125°C junction temperature, covering full automotive ambient requirements without derating.
LTC4381ADKE-3#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 ~ 72V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-DFN (7x5)
LTC4381ADKE-3#TRPBF FAQ
1.How can I place an order for LTC4381ADKE-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4381ADKE-3#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-3#TRPBF reliable?
The price and inventory of LTC4381ADKE-3#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-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4381ADKE-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4381ADKE-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4381ADKE-3#TRPBF?
LTC4381ADKE-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4381ADKE-3#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-3#TRPBF?
For technical support, including LTC4381ADKE-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4381ADKE-3#TRPBF requirements.
6.How does Aetrix verify that LTC4381ADKE-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4381ADKE-3#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-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4381ADKE-3#TRPBF?
All LTC4381ADKE-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4381ADKE-3#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-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC4381ADKE-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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