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Analog Devices Inc. LTC4380HMS-2#PBF
- Part No.:
- LTC4380HMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4380HMS-2#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
LTC4380HMS-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 250Vpk, and overcurrent faults. It features fixed 31.5V/50V gate clamp selection (SEL-configurable), 8µA operating current, –40°C to 125°C extended temperature rating, and auto-retry fault behavior. It is used in 12V/24V automotive power rails where robust transient suppression and battery-backed operation are required.
For engineers reviewing the LTC4380HMS-2#PBF datasheet, LTC4380HMS-2#PBF pinout, LTC4380HMS-2#PBF application, or LTC4380HMS-2#PBF equivalent, key selection criteria include gate clamp voltage configuration (SEL pin logic), TMR capacitor-based fault timing, reverse input protection to –60V, latchoff vs. auto-retry behavior, and compatibility with high-voltage N-channel MOSFETs rated ≥72V VDS.
Technical Context
The LTC4380HMS-2#PBF implements a multiplier-based fault timer that generates TMR pin current proportional to both MOSFET VDS (via DRN pin) and ID (via SNS–OUT differential voltage), enabling dynamic SOA protection. Its internal 20µA charge pump regulates GATE to VOUT + 11.5V during normal operation, while clamping GATE to either 31.5V or 50V (SEL-selectable) during overvoltage events.
It supports auto-retry fault recovery with a 15-cycle cool-down sequence on the TMR pin, discharging to 100mV before automatic restart - distinct from latchoff versions (–1/–3). The ON pin serves dual function: undervoltage detection (1.05V threshold) and shutdown control, reducing quiescent current to 6µA when pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input supply - supports 12V/24V/28V automotive systems and industrial rails up to 72V. |
| Quiescent Current | 8µA typical at 12V - enables always-on battery-powered applications without excessive drain. |
| Gate Clamp Options | 31.5V (SEL = GND) or 50V (SEL = VCC) - sets output clamp ~27V or ~45V respectively for 12V/24V system protection. |
| Fault Behavior | Auto-retry with cool-down - automatically recovers after fault clears; no manual reset required. |
| Reverse Input Rating | –60V - withstands reverse battery connection without damage. |
| Current Limit Threshold | 50mV (rising), 62mV (severe short, VOUT < 1.5V) - defines precise overcurrent trip point via external sense resistor. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and harsh industrial environments. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm), exposed pad (GND), –40°C to +125°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | N-channel MOSFET gate driver output | Regulated 20µA charge pump drives gate; clamped to 31.5V/50V (SEL-dependent) during overvoltage. |
| DRN | MOSFET drain-source sense input | Tracks OUT; current through RDRN ∝ VDS, feeds multiplier for MOSFET stress-aware fault timing. |
| SNS | Current sense amplifier input (+) | Monitors voltage across external sense resistor; controls gate to hold ΔVSNS = 50mV/62mV. |
| OUT | Output voltage sense reference | Low-impedance return for SNS and DRN; bypass with ≥22µF capacitor for stability. |
| VCC | Main supply input | 4V–72V operating range; tolerates –60V reverse; requires Zener clamp for >80V transients. |
| ON | Enable/shutdown & UVLO input | 1.05V threshold; open = enabled; pulled low = 6µA shutdown; also detects input undervoltage. |
| FLT | Open-drain fault indicator | Pulls low during overvoltage/overcurrent fault; sinks up to 3mA; signals active protection state. |
| SEL | Gate clamp voltage select | GND = 31.5V clamp; VCC/OUT = 50V clamp - configures output clamp level for 12V or 24V systems. |
| TMR | Fault timer integration node | Capacitor-connected pin; charges/discharges based on MOSFET stress; triggers FLT and GATE off at 1.215V. |
| GND | Device ground reference | Reference for all analog circuitry; exposed pad must be connected to PCB ground for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | Enables autonomous system recovery after transient overvoltage or overload without host intervention. |
| Reverse input protection to –60V | Eliminates need for external reverse-polarity diode or FET in battery-fed systems. |
| Adjustable fault timing via CTMR | Single external capacitor sets both fault timeout and cool-down duration - simplifies design and improves repeatability. |
| Accurate 50mV current limit | Provides stable, temperature-compensated overcurrent protection independent of MOSFET RDS(on). |
| Low 8µA operating current | Extends battery life in always-on telematics, ADAS sensors, and infotainment standby modes. |
Applications
| Automotive Load Dump Protection | High-Side Battery Switch |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from 12V system load dump transients up to 250Vpk during alternator regulation failure. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; limits output to 27V using 31.5V gate clamp (SEL = GND); auto-retry ensures uninterrupted operation after transient. Use Value: Prevents catastrophic failure of downstream 3.3V/5V regulators and microcontrollers without requiring oversized TVS or complex crowbar circuits. | Use Scenario: Enabling/disabling power to a CAN transceiver or GPS module in a vehicle's always-on domain. IC Role / Device Role / Timing Role: High-side switch controller with programmable ON pin threshold (1.05V) and 6µA shutdown mode; integrates UVLO and reverse-battery tolerance. Use Value: Replaces discrete high-side switch solutions with Schottky diodes and bias networks, reducing BOM count and forward voltage drop. |
| Industrial 24V Power Rail Protection | Hot-Swap Controller for Telecom Shelf |
Use Scenario: Securing PLC I/O modules and sensor interfaces against 24V/28V rail surges caused by inductive load switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Overvoltage/overcurrent protector with 50V gate clamp (SEL = VCC); TMR capacitor tailors fault response to system SOA requirements. Use Value: Delivers predictable, MOSFET-stress-aware shutdown timing - avoids premature tripping during benign inrush while blocking sustained faults. | Use Scenario: Controlling power-up sequencing and fault isolation for line cards inserted into live telecom backplanes. IC Role / Device Role / Timing Role: Hot-swap controller driving external N-MOSFET; uses DRN/SNS multiplier to detect MOSFET power dissipation and prevent thermal runaway during insertion. Use Value: Enables safe live insertion without inrush current limiting resistors or complex current-foldback schemes - reduces board space and thermal overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380HDD-2#PBF | Same functionality and specs, but in 3mm × 3mm DFN package with θJA = 43°C/W (vs. MSOP's 160°C/W). | Better thermal performance in high-power-density layouts; requires different PCB footprint and reflow profile. | Select for thermally constrained designs needing lower junction-to-ambient resistance. |
| LTC4380IMS-2#PBF | Identical MSOP package and pinout, but rated for –40°C to +85°C (vs. H-grade's +125°C). | Not qualified for under-hood automotive use; suitable for cabin or industrial ambient environments. | Select when full AEC-Q100 H-grade temperature range is not required, reducing cost. |
Compared with LTC4380HDD-2#PBF, the LTC4380HMS-2#PBF offers superior layout flexibility in space-constrained boards but higher thermal resistance; compared with LTC4380IMS-2#PBF, it delivers guaranteed operation at 125°C ambient - critical for engine bay or high-temperature industrial enclosures.
Availability
LTC4380HMS-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, high-side battery switching, industrial 24V rail hardening, and hot-swap controller applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC4380HMS-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, 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 LTC4380 product line is designed specifically for robust, low-quiescent-current surge protection in automotive and industrial power systems - emphasizing MOSFET stress awareness, reverse polarity resilience, and extended temperature reliability.
FAQ
What is the gate clamp voltage configuration for LTC4380HMS-2#PBF?
The LTC4380HMS-2#PBF supports two fixed internal gate clamp voltages: 31.5V when the SEL pin is tied to GND (for 12V systems), and 50V when SEL is tied to VCC or OUT (for 24V/28V systems). This directly determines the maximum clamped output voltage - approximately 27V or 45V respectively - and is confirmed in the device's Electrical Characteristics table and Pin Functions description.
Does LTC4380HMS-2#PBF support auto-retry or latchoff fault behavior?
LTC4380HMS-2#PBF implements auto-retry fault behavior. Upon overvoltage or overcurrent fault, it enters a cool-down phase on the TMR pin (15-cycle charge/discharge sequence), then automatically restarts when TMR discharges to 100mV. This is inherent to the "–2" suffix and distinguishes it from latchoff versions (–1/–3), which require ON pin pulse or power cycle to recover.
What is the maximum reverse input voltage the LTC4380HMS-2#PBF can withstand?
The LTC4380HMS-2#PBF is rated for reverse input voltage down to –60V on the VCC pin, as specified in Absolute Maximum Ratings. This allows direct connection to automotive battery inputs without external reverse-polarity protection components, and is validated across the full –40°C to +125°C operating range.
How does the TMR pin function in LTC4380HMS-2#PBF?
The TMR pin in LTC4380HMS-2#PBF integrates a current proportional to MOSFET power dissipation (VDS × ID). When TMR voltage reaches 1.215V, the GATE turns off and FLT pulls low. During auto-retry, TMR then cycles between ~1.215V and ~3.4V for 15 times before discharging to 100mV to enable restart - providing adaptive, stress-aware fault timing confirmed in the Operation section and Typical Performance Characteristics.
Can LTC4380HMS-2#PBF drive back-to-back N-channel MOSFETs for reverse input protection?
Yes, the LTC4380HMS-2#PBF GATE pin can drive back-to-back N-channel MOSFETs to implement bidirectional reverse input protection - eliminating Schottky diode voltage drop and conduction loss. This capability is explicitly stated in the Features section and supported by the GATE drive architecture, which regulates relative to OUT and tolerates reverse VCC down to –60V.
LTC4380HMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
LTC4380HMS-2#PBF FAQ
1.How can I place an order for LTC4380HMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380HMS-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 LTC4380HMS-2#PBF reliable?
The price and inventory of LTC4380HMS-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 LTC4380HMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380HMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380HMS-2#PBF?
LTC4380HMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380HMS-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 LTC4380HMS-2#PBF?
For technical support, including LTC4380HMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HMS-2#PBF requirements.
6.How does Aetrix verify that LTC4380HMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380HMS-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 LTC4380HMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380HMS-2#PBF?
All LTC4380HMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HMS-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 LTC4380HMS-2#PBF part is unused and in its original packaging.
Return procedure for LTC4380HMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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