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Analog Devices Inc. LTC4380HDD-2#PBF
- Part No.:
- LTC4380HDD-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380HDD-2#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,485
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Product details
Overview
LTC4380HDD-2#PBF 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, overvoltage transients up to 250V, and overcurrent faults. It features fixed 31.5V/50V gate clamp selection via SEL pin, 8µA operating current, –40°C to 125°C extended temperature rating, and auto-retry fault behavior for continuous system resilience in harsh environments like vehicle power systems.
For engineers reviewing the LTC4380HDD-2#PBF datasheet, LTC4380HDD-2#PBF pinout, LTC4380HDD-2#PBF application, or LTC4380HDD-2#PBF equivalent, key selection criteria include its 10-pin DFN (3mm × 3mm) package, H-grade automotive qualification (AEC-Q100), adjustable fault timer with MOSFET stress acceleration, reverse input protection to –60V, and compatibility with high-side N-MOSFET configurations for battery-powered systems.
Technical Context
The LTC4380HDD-2#PBF implements a multiplier-based fault timer where TMR pin current scales with both VDS (via DRN pin) and ID (via SNS–OUT voltage), enabling dynamic SOA protection proportional to MOSFET power dissipation. Its internal 20µA charge pump regulates GATE to VOUT + 11.5V during normal operation, while clamping GATE to 31.5V (SEL = GND) or 50V (SEL = VCC) during overvoltage events.
It supports auto-retry behavior: after fault timeout at TMR = 1.215V, it enters a cool-down phase with bidirectional 2µA TMR current, cycling 15 times between 1.215V and 3.4V before discharging to 100mV and re-enabling the MOSFET - eliminating manual reset requirements in unattended systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input - supports 12V/24V/28V automotive and industrial rails without external regulation |
| Quiescent Current | 8µA typical - enables always-on battery-backed applications with minimal standby drain |
| Gate Clamp Options | 31.5V or 50V (SEL-selectable) - sets output clamp at ~27V or ~45V respectively for 12V/24V system compliance |
| Fault Timer Behavior | Auto-retry with cool-down - automatically recovers after transient overvoltage/overcurrent without ON pin intervention |
| Reverse Input Protection | –60V withstand - allows direct connection to reversed battery terminals without damage |
| Package & Temp Grade | 10-lead 3mm × 3mm DFN, –40°C to 125°C - qualified for under-hood automotive use per AEC-Q100 |
| Current Limit Threshold | 50mV (rising), 62mV (severe short) - provides precise, scalable load current limiting via external sense resistor |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND, optional PCB connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device ground reference | Common return for all internal circuitry; exposed pad must be connected to system GND for thermal and electrical integrity |
| VCC | Main supply input | Accepts 4V–72V input; withstands –60V reverse bias; requires external Zener or RC filter for >80V transients |
| OUT | Output voltage sense | Monitors load-side voltage; internal clamp limits GATE–OUT to 17V; bypass with ≥22µF capacitor |
| SNS | Current sense input | Connects to high-side of sense resistor; regulates ΔVSNS to 50mV/62mV for overcurrent limiting |
| DRN | MOSFET drain-source sense | Tracks VDS via external RDRN; generates TMR current proportional to MOSFET power stress |
| GATE | N-MOSFET gate driver | Drives external FET with regulated 11.5V above OUT; clamped to 31.5V/50V (SEL-dependent) during overvoltage |
| ON | Enable/shutdown control | Turns device on at >1.05V; pulls down to <0.99V for shutdown (6µA IQ); tolerates –60V to 80V |
| SEL | Gate clamp voltage select | GND = 31.5V clamp; VCC/OUT = 50V clamp - determines output clamp level for 12V vs 24V systems |
| TMR | Fault timer integrator | Capacitor-connected node; charges with MOSFET-stress-proportional current; trips at 1.215V |
| FLT | Open-drain fault indicator | Pulls low during fault; sinks up to 3mA; signals active protection state to host controller or status LED |
Key Features
| Feature | Design Value |
|---|---|
| Low 8µA operating current | Enables permanent connection to vehicle battery without excessive parasitic drain in sleep mode |
| Auto-retry fault recovery | Eliminates need for microcontroller intervention or power cycle after transient overvoltage events |
| Reverse input protection to –60V | Withstands accidental battery reversal in automotive installations without external diode or protection circuit |
| Adjustable MOSFET stress timing | TMR current scales with VDS × ID, shortening fault timeout during high-power dissipation to prevent SOA violation |
| Back-to-back MOSFET support | GATE drive architecture enables reverse polarity protection without Schottky diode voltage drop or heat loss |
Applications
| Automotive Load Dump Protection | High-Side Battery Switch |
|---|---|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 12V system load dump transients up to 250V. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET as high-side switch; clamps output to 27V using 31.5V gate clamp (SEL = GND). Use Value: Prevents damage to downstream 28V-rated components while maintaining uninterrupted operation during ISO 7637-2 Pulse 5a events. | Use Scenario: Enabling/disabling power to telematics modules in always-on vehicle architectures. IC Role / Device Role / Timing Role: High-side switch controller with undervoltage lockout (ON pin comparator) and 8µA quiescent draw. Use Value: Reduces battery leakage below 10µA during vehicle sleep mode, extending parked battery life beyond 30 days. |
| Industrial Power Rail Protection | Avionic Hot-Swap Interface |
Use Scenario: Safeguarding programmable logic controllers (PLCs) against 48V DC bus surges caused by inductive load switching. IC Role / Device Role / Timing Role: Overvoltage/overcurrent protector with adjustable fault timer (CTMR) and auto-retry for unattended operation. Use Value: Maintains process continuity by recovering automatically after transient faults, avoiding manual reset or downtime. | Use Scenario: Providing controlled power-up sequencing for line-replaceable avionics units in aircraft maintenance bays. IC Role / Device Role / Timing Role: Hot-swap controller with soft-start ramp control (5ms turn-on delay) and reverse polarity immunity. Use Value: Prevents arcing and inrush current damage during live insertion while supporting –60V reverse input tolerance per DO-160 Section 22. |
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#PBF | Latch-off fault behavior (no auto-retry); identical gate clamp, temp grade, and package | Requires external reset (ON pin pulse or power cycle) after fault - unsuitable for unattended systems | Select when deterministic shutdown is preferred over autonomous recovery |
| LTC4380HMS-2#PBF | Same functionality and specs, but in 10-lead MSOP package (5.0mm × 4.4mm) | Compatible with legacy layouts using MSOP footprints; higher θJA (160°C/W) vs DFN (43°C/W) | Select when board space allows larger package or MSOP is already standardized |
Compared with LTC4380HDD-1#PBF, the LTC4380HDD-2#PBF enables hands-free recovery from transients, reducing system-level fault handling complexity; versus LTC4380HMS-2#PBF, it offers superior thermal performance and smaller footprint for space-constrained automotive modules.
Availability
LTC4380HDD-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, high-side battery switching, and industrial power rail safeguarding requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4380HDD-2#PBF 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 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 LTC4380 product line delivers robust, low-IQ surge protection ICs designed specifically for automotive and harsh-environment power systems requiring AEC-Q100 qualification, reverse polarity tolerance, and adaptive MOSFET stress management.
FAQ
What is the maximum input voltage the LTC4380HDD-2#PBF can withstand without external protection?
The LTC4380HDD-2#PBF operates from 4V to 72V and withstands reverse input voltages down to –60V. For positive transients exceeding 80V (e.g., automotive load dump), external protection - such as a 68V Zener diode on VCC or RC filtering - is required to prevent damage. The datasheet specifies absolute maximum VCC as 80V, and operation beyond this requires clamping.
How does the LTC4380HDD-2#PBF achieve auto-retry behavior, and what is the cool-down timing mechanism?
The LTC4380HDD-2#PBF enters auto-retry mode after fault timeout: TMR discharges to 100mV following 15 bidirectional cycles between 1.215V and 3.4V, each governed by 2µA pull-up/pull-down current. Total cool-down time depends on CTMR value - e.g., 8.2µF yields ~1.2s per half-cycle. This eliminates need for external reset circuitry and enables autonomous recovery in inaccessible deployments.
Can the LTC4380HDD-2#PBF be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes, the LTC4380HDD-2#PBF's GATE driver supports back-to-back N-MOSFET configurations. By driving both gates referenced to their respective sources, it enables true bidirectional reverse input protection to –60V without Schottky diodes - reducing forward voltage drop, conduction loss, and thermal burden compared to diode-based solutions.
What is the role of the DRN pin in MOSFET stress management for the LTC4380HDD-2#PBF?
The DRN pin senses VDS across the external MOSFET via RDRN and feeds this signal into an internal multiplier with ΔVSNS (ID). The resulting TMR current is proportional to instantaneous MOSFET power dissipation (VDS × ID), causing faster fault timeout under high-stress conditions - directly enforcing Safe Operating Area (SOA) compliance without fixed-time delays.
Is the LTC4380HDD-2#PBF AEC-Q100 qualified, and which stress test grades does it meet?
Yes, the LTC4380HDD-2#PBF is AEC-Q100 qualified for automotive applications. As an H-grade part, it meets Grade 1 temperature range (–40°C to +125°C ambient), along with required tests for human body model ESD (±2kV), latch-up (±100mA), and mechanical shock/vibration. Full qualification reports are available from Analog Devices upon request.
LTC4380HDD-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- 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-2#PBF FAQ
1.How can I place an order for LTC4380HDD-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380HDD-2#PBF 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-2#PBF reliable?
The price and inventory of LTC4380HDD-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380HDD-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380HDD-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HDD-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380HDD-2#PBF?
LTC4380HDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380HDD-2#PBF 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-2#PBF?
For technical support, including LTC4380HDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HDD-2#PBF requirements.
6.How does Aetrix verify that LTC4380HDD-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380HDD-2#PBF 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-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380HDD-2#PBF?
All LTC4380HDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HDD-2#PBF, 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-2#PBF part is unused and in its original packaging.
Return procedure for LTC4380HDD-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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