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Analog Devices Inc. LTC4380HDD-3#TRPBF
- Part No.:
- LTC4380HDD-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380HDD-3#TRPBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,935
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Product details
Overview
LTC4380HDD-3#TRPBF from Analog Devices is a low-quiescent-current surge stopper IC that controls an external N-channel MOSFET to protect downstream loads from automotive load dump, reverse input, overvoltage (up to 72V input), and overcurrent events. It features adjustable gate clamp voltage, 8µA operating current, –40°C to 125°C temperature grade, and 10-pin 3mm × 3mm DFN package. Used in battery-powered automotive ECUs requiring robust transient protection.
For engineers reviewing the LTC4380HDD-3#TRPBF datasheet, LTC4380HDD-3#TRPBF pinout, LTC4380HDD-3#TRPBF application, or LTC4380HDD-3#TRPBF equivalent, key selection criteria include its adjustable gate clamp architecture (no internal 31.5V/50V clamp), latchoff fault behavior, reverse input protection to –60V, 4V–72V operating range, and H-grade automotive qualification.
Technical Context
The LTC4380HDD-3#TRPBF implements a multiplier-based fault timer where TMR pin current scales with both MOSFET VDS (via DRN pin) and ID (via SNS–OUT differential), enabling dynamic SOA protection proportional to real-time power dissipation. Its GATE driver operates as a regulated charge pump (VGATE = VOUT + 11.5V) without fixed internal gate-to-GND clamps-clamping is fully external via VCC Zener.
It uses an ON pin comparator for undervoltage detection (1.05V threshold) and shutdown control, reducing quiescent current to 6µA. The SEL pin is internally tied to GND per -3 variant specification, disabling internal clamp selection logic and confirming externally adjustable operation only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input - supports 12V/24V/28V automotive systems and industrial rails up to 72V without external regulation. |
| Quiescent Current | 8µA typical at 25°C - enables always-on battery monitoring and low-power wake-up circuits in automotive modules. |
| Fault Response | Latchoff behavior - output remains off after overvoltage/overcurrent until ON pin pulsed low ≥100µs or power cycled; prevents uncontrolled retries during sustained faults. |
| Reverse Input Protection | Withstands –60V on VCC - eliminates need for external series diode or TVS in reverse-battery scenarios. |
| Current Limit Threshold | 50mV (rising), 62mV (severe short, OUT < 1.5V) - sets precise, temperature-stable current limit via external sense resistor (e.g., 20mΩ → 2.5A/3.1A). |
| Package | 10-lead 3mm × 3mm DFN with exposed pad - thermally optimized for high-power dissipation in compact automotive PCB layouts. |
| Temperature Grade | H-grade (–40°C to +125°C ambient) - qualified for under-hood ECU placement per AEC-Q100 requirements. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 11 = GND, optional PCB connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device ground reference | Primary return path for all internal circuitry and exposed pad; must be low-impedance for stable fault timing and thermal performance. |
| VCC | Positive supply input | Accepts 4V–72V; withstands –60V reverse; requires external Zener clamp for overvoltage protection (no internal clamp in -3 variant). |
| OUT | Output voltage sense | Connects to MOSFET source; senses regulated output; bypassed with ≥22µF capacitor for stability and transient response. |
| SNS | Current sense input | Connects to MOSFET source-side of sense resistor; monitors ΔVSNS for current limiting; limited to ±5V differential vs OUT. |
| DRN | MOSFET drain-source sense | Tracks OUT; develops current proportional to VDS across RDRN; enables power-dissipation-based fault timing. |
| GATE | N-MOSFET gate drive | Regulated charge pump output (VOUT + 11.5V); clamped to VCC + 13.5V only - no internal GND-referenced clamp (LTC4380-3 specific). |
| ON | Enable/shutdown & UVLO input | 1.05V threshold; pulls device into 6µA shutdown when < 0.99V; supports high-voltage enable (up to 80V) and reverse-battery tolerance. |
| SEL | Gate clamp select | Tied internally to GND in LTC4380-3 - disables internal clamp selection logic; confirms externally adjustable operation only. |
| FLT | Open-drain fault indicator | Pulls low during latched-off fault state; sinks up to 3mA; signals persistent overvoltage/overcurrent condition to system controller. |
| TMR | Fault timer capacitor node | Integrates scaled VDS×ID current; charges to 1.215V to trigger latchoff; requires X7R capacitor (e.g., 8.2µF) for accurate timing. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable gate clamp architecture | No internal 31.5V/50V gate-to-GND clamp - full control via external VCC Zener (e.g., 68V) enables precise output clamping from 18V to 86V. |
| Latchoff fault behavior | Eliminates uncontrolled auto-retry cycles during sustained overvoltage (e.g., load dump), preventing MOSFET thermal runaway and ensuring deterministic system recovery. |
| Reverse input protection to –60V | Enables direct connection to vehicle battery without series diode, reducing voltage drop, heat, and BOM count in always-on modules. |
| Multiplier-based fault timer | TMR current scales with MOSFET VDS × ID, shortening fault timeout under high stress - keeps MOSFET within SOA during combined overvoltage + overload events. |
| H-grade AEC-Q100 qualification | Validated for –40°C to +125°C operation - suitable for engine control units, ADAS domain controllers, and other under-hood applications. |
Applications
| Automotive Load Dump Protection | Reverse Battery Protection |
|---|---|
|
Use Scenario: 12V automotive ECU subjected to ISO 16750-2 load dump transients up to 120V for 400ms. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; regulates GATE to clamp output at ~27V using external 68V Zener on VCC. Use Value: Prevents damage to downstream 3.3V/5V regulators and microcontrollers while maintaining >99% efficiency during normal operation. |
Use Scenario: Telematics module connected directly to vehicle battery with risk of accidental reverse polarity connection. IC Role / Device Role / Timing Role: Reverse input protector; blocks –60V fault current using internal circuitry without Schottky diode. Use Value: Eliminates 0.3–0.5V forward drop and associated heat dissipation, extending battery life in always-on tracking devices. |
| Industrial 24V Rail Protection | High-Side Switch for Battery-Powered Systems |
|
Use Scenario: Programmable logic controller (PLC) I/O module powered from 24V DC supply exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Overvoltage/overcurrent limiter; uses adjustable gate clamp and latchoff to isolate load during sustained 80V+ transients. Use Value: Provides fail-safe shutdown without retry-induced stress, meeting IEC 61000-4-5 Level 4 immunity requirements. |
Use Scenario: Portable medical device with Li-ion battery requiring controlled power-up and fault-isolated standby mode. IC Role / Device Role / Timing Role: High-side switch controller; enables <8µA quiescent current in shutdown and precise current-limited hot-swap insertion. Use Value: Extends battery runtime by >30% versus discrete PMOS solutions and supports safe field-replaceable module insertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380HDD-1#TRPBF | Fixed internal 31.5V/50V gate clamp (SEL-selectable); same H-grade, latchoff behavior, and package. | Preconfigured for 12V (27V clamp) or 24V/28V (45V clamp) systems; no external Zener required for basic clamping. | Select when fixed clamp voltages meet system requirements and external component count reduction is prioritized over flexibility. |
| LTC4380HMS-3#TRPBF | Same -3 functionality and electrical specs, but in 10-lead MSOP package (5.0mm × 4.4mm, θJA = 160°C/W). | Lower thermal performance and larger footprint; suited for prototyping or space-tolerant industrial boards where DFN reflow is constrained. | Select only if MSOP assembly infrastructure exists and thermal derating margins allow for higher junction temperatures. |
Compared with LTC4380HDD-1#TRPBF, the LTC4380HDD-3#TRPBF trades internal clamp convenience for full external adjustability - critical when precise output clamping (e.g., 36V for 24V systems with margin) or VCC filtering integration is required. Versus LTC4380HMS-3#TRPBF, the DFN package delivers superior thermal resistance (θJA = 43°C/W) essential for high-current automotive deployments.
Availability
LTC4380HDD-3#TRPBF is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and portable medical devices requiring stable component supply with AEC-Q100 compliance, extended temperature operation, and low-quiescent-current surge protection.
Supply support for LTC4380HDD-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 LTC4380 family is designed as a precision surge stopper platform for automotive and industrial power rails - delivering ultra-low quiescent current, programmable fault response, and robust MOSFET SOA protection without compromising efficiency.
FAQ
What is the gate clamp configuration of LTC4380HDD-3#TRPBF?
The LTC4380HDD-3#TRPBF has no internal gate-to-GND clamp - it relies entirely on external clamping of the VCC pin (e.g., via Zener diode) to set the effective gate clamp voltage. This enables fully adjustable output clamping from 18V to 86V, unlike the fixed 31.5V/50V options in LTC4380-1/-2 variants. The SEL pin is internally tied to GND to disable clamp selection logic.
Does LTC4380HDD-3#TRPBF support auto-retry after fault conditions?
No. The LTC4380HDD-3#TRPBF implements latchoff fault behavior: once the TMR pin reaches 1.215V due to overvoltage or overcurrent, the MOSFET turns off and remains latched off until the ON pin is pulled low for at least 100µs or power is cycled. This prevents uncontrolled restart attempts during sustained faults, distinguishing it from LTC4380-2/-4 auto-retry variants.
What is the maximum reverse input voltage rating for LTC4380HDD-3#TRPBF?
The LTC4380HDD-3#TRPBF is rated for –60V reverse input on the VCC pin, verified across the full –40°C to +125°C temperature range. This allows direct connection to automotive batteries without external reverse-polarity protection diodes, eliminating forward voltage drop and associated power loss in always-on systems.
How does the fault timer in LTC4380HDD-3#TRPBF respond to MOSFET stress?
The fault timer in LTC4380HDD-3#TRPBF uses a multiplier circuit that generates TMR pin current proportional to both MOSFET VDS (sensed at DRN) and ID (sensed via ΔVSNS). Higher power dissipation accelerates TMR charging, shortening the fault timeout - this dynamically constrains MOSFET operation within its safe operating area during combined overvoltage and overload events.
What package and thermal characteristics apply to LTC4380HDD-3#TRPBF?
LTC4380HDD-3#TRPBF uses a 10-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 11 = GND). Its thermal resistance is θJA = 43°C/W, significantly lower than the MSOP variant (θJA = 160°C/W), enabling higher continuous current capability in compact automotive PCB layouts with standard 2-oz copper and thermal vias.
LTC4380HDD-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC4380HDD-3#TRPBF FAQ
1.How can I place an order for LTC4380HDD-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380HDD-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 LTC4380HDD-3#TRPBF reliable?
The price and inventory of LTC4380HDD-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 LTC4380HDD-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4380HDD-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HDD-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380HDD-3#TRPBF?
LTC4380HDD-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380HDD-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 LTC4380HDD-3#TRPBF?
For technical support, including LTC4380HDD-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HDD-3#TRPBF requirements.
6.How does Aetrix verify that LTC4380HDD-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4380HDD-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 LTC4380HDD-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4380HDD-3#TRPBF?
All LTC4380HDD-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HDD-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 LTC4380HDD-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC4380HDD-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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