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Analog Devices Inc. LTC4380IDD-3#PBF
- Part No.:
- LTC4380IDD-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380IDD-3#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:111
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Product details
Overview
LTC4380IDD-3#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, input overvoltage (up to 72V), and overcurrent events. It features adjustable gate clamp voltage (via external Zener on VCC), 8µA operating current, –40°C to +85°C industrial temperature grade, and latches off during faults. Used in 12V/24V vehicle power distribution systems with battery backup.
For engineers reviewing the LTC4380IDD-3#PBF datasheet, LTC4380IDD-3#PBF pinout, LTC4380IDD-3#PBF application, or LTC4380IDD-3#PBF equivalent, key selection criteria include gate clamp configurability, latchoff fault behavior, reverse input protection to –60V, MOSFET stress acceleration via TMR-based multiplier, and compatibility with high-side N-MOSFET architectures in always-on automotive modules.
Technical Context
The LTC4380IDD-3#PBF implements a voltage-controlled gate drive with internal 20µA charge pump regulating GATE to VOUT + 11.5V, while relying entirely on external Zener clamping at VCC for output voltage limiting-no internal gate-to-GND clamp exists. Its TMR pin integrates a current proportional to both VDS (via DRN) and ID (via SNS), enabling MOSFET power-dissipation–adaptive fault timing.
It uses an ON pin comparator with 1.05V threshold and 45mV hysteresis for undervoltage detection and shutdown control, reducing quiescent current to 6µA. Fault response is latchoff-only (no auto-retry), requiring ON pin pulse <100µs or power cycle to reset-distinct from -2/-4 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input; supports 12V/24V/28V automotive systems with extended surge tolerance |
| Quiescent Current | 8µA typical at 25°C; enables direct connection to vehicle battery without excessive drain |
| Fault Response | Latchoff only; requires ON pin pulse or power cycle-no automatic retry reduces thermal cycling stress |
| Gate Clamp Method | Externally adjustable via Zener diode on VCC; no internal gate-to-GND clamp (LTC4380-3 variant) |
| Reverse Input Protection | Withstands –60V reverse battery; eliminates need for external Schottky diode in high-side switch |
| Current Limit Threshold | 50mV (SNS–OUT) at OUT > 3V; rises to 62mV when OUT < 1.5V for short-circuit hardening |
| TMR Fault Threshold | 1.215V; triggers MOSFET turn-off and FLT assertion when integrated MOSFET stress exceeds safe operating area |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN (DD package), exposed pad connected to GND. Thermal resistance θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device ground reference and exposed pad connection | Must be low-impedance PCB plane; exposed pad improves thermal performance and EMI immunity |
| VCC | Main supply input (4V–72V) | Accepts reverse voltage down to –60V; requires external Zener for overvoltage clamping (LTC4380-3) |
| OUT | Output voltage sense node | Connects to MOSFET source; bypass with ≥22µF capacitor near pin to stabilize current limit loop |
| SNS | Current sense input | Monitors voltage drop across external sense resistor; ΔVSNS limited to ±5V maximum |
| DRN | MOSFET drain-source sense | Tracks OUT; current through RDRN ∝ VDS for MOSFET stress calculation |
| GATE | N-MOSFET gate driver output | Regulated to VOUT + 11.5V; clamped to VCC + 13.5V; requires 47nF/33Ω RC compensation |
| ON | Enable/shutdown and UVLO input | 1.05V threshold with 45mV hysteresis; pulls low <100µs to reset latchoff fault |
| SEL | Gate clamp select (fixed versions only) | Internally tied to GND in LTC4380-3; unused but must be grounded per datasheet |
| FLT | Open-drain fault indicator | Pulls low during fault; sinks up to 3mA; high-Z otherwise |
| TMR | Fault timer integrator | Capacitor-connected node; current scales with MOSFET power dissipation; 1.215V trip point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Clamping | Enabled by external Zener on VCC-supports precise clamp voltages from 18V to 86V without internal fixed options |
| Latchoff Fault Behavior | Prevents uncontrolled cycling during sustained overvoltage; ensures system remains safe until deliberate reset |
| Reverse Input Protection | –60V rating eliminates series Schottky diode, reducing forward drop, heat, and board space in battery-fed systems |
| MOSFET Stress Acceleration | TMR current multiplies VDS × ID, shortening fault timeout under high-power stress-protects MOSFET SOA |
| Ultra-Low Quiescent Current | 8µA operation enables use in always-on automotive modules (e.g., telematics, ADAS sensors) without battery drain |
Applications
| Automotive Load Dump Protection | High-Side Battery Switch |
|---|---|
Use Scenario: Protecting infotainment head units from 12V system load dump transients up to 250V peak. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET as high-side pass element; clamps output to safe level using Zener-regulated VCC. Use Value: Prevents damage to downstream 27V-rated DC-DC converters and microcontrollers without derating or oversized TVS. |
Use Scenario: Enabling/disabling 12V battery power to always-on ADAS camera module with reverse polarity tolerance. IC Role / Device Role / Timing Role: High-side switch controller with undervoltage lockout and latchoff fault handling. Use Value: Eliminates Schottky diode voltage drop (≈0.4V), improving efficiency and thermal margin in compact camera housing. |
| Industrial Power Sequencing | Rail Isolation for Redundant Supplies |
Use Scenario: Controlled power-up of PLC I/O modules where inrush current must be limited and overvoltage blocked. IC Role / Device Role / Timing Role: Soft-start and overcurrent-limited pass controller; ON pin used for sequenced enable. Use Value: Prevents bus collapse during cold start while maintaining 8µA standby draw between cycles. |
Use Scenario: Isolating dual 24V redundant power rails in railway signaling equipment to prevent backfeed. IC Role / Device Role / Timing Role: Reverse-input–tolerant high-side switch with –60V capability and latchoff fault hold. Use Value: Ensures fail-safe rail separation without external blocking diodes or complex OR-ing controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380IMS-3#PBF | Same functionality and electrical specs; MSOP-10 package instead of DFN-10 | Preferred for prototyping or manual assembly; larger footprint eases soldering and probing | Select when thermal performance is less critical than layout flexibility or hand-soldering feasibility |
| LTC4380HDD-3#PBF | Identical pinout and function; rated for –40°C to +125°C ambient vs. –40°C to +85°C | Required for under-hood automotive locations or high-ambient industrial enclosures | Choose when operating junction temperature exceeds 125°C or AEC-Q100 H-grade qualification is mandated |
Compared with LTC4380IMS-3#PBF, the LTC4380IDD-3#PBF offers superior thermal performance (θJA = 43°C/W vs. 160°C/W) in space-constrained layouts; compared with LTC4380HDD-3#PBF, it trades extended temperature range for lower cost and sufficient robustness in cabin-mounted electronics.
Availability
LTC4380IDD-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, high-side battery switching, and industrial power sequencing requiring stable component supply, long-term lifecycle support, and AEC-Q100–compatible reliability.
Supply support for LTC4380IDD-3#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, and automotive safety markets.
The LTC4380 product line delivers ultra-low-quiescent-current surge protection ICs designed specifically for automotive and industrial high-reliability power distribution, emphasizing latchoff safety, reverse battery tolerance, and MOSFET stress-aware fault timing.
FAQ
What is the gate clamp configuration for LTC4380IDD-3#PBF?
The LTC4380IDD-3#PBF has no internal gate-to-GND clamp-it is an LTC4380-3 variant. Output voltage clamping is achieved exclusively by placing a Zener diode between VCC and GND. The GATE pin is regulated to VOUT + 11.5V and clamped to VCC + 13.5V. This allows precise, externally set clamp voltages from 18V to 86V, unlike fixed 31.5V/50V options in -1/-2 versions.
Does LTC4380IDD-3#PBF support auto-retry after overvoltage fault?
No. The LTC4380IDD-3#PBF implements latchoff-only fault behavior. Once the TMR pin reaches 1.215V and the MOSFET turns off, LTC4380IDD-3#PBF remains latched until the ON pin is pulled low for at least 100µs or power is cycled. Auto-retry is exclusive to LTC4380-2 and LTC4380-4 variants.
What is the maximum reverse input voltage the LTC4380IDD-3#PBF can withstand?
The LTC4380IDD-3#PBF withstands –60V applied to the VCC pin relative to GND, with ON and SEL pins open or biased within their absolute ratings. This enables direct reverse-battery protection in automotive applications without external diodes-reducing voltage drop, heat, and component count in high-side switch designs.
How does the TMR pin current scale with MOSFET stress in LTC4380IDD-3#PBF?
In LTC4380IDD-3#PBF, the TMR pin current is generated by an internal multiplier that scales with both VDS (measured via DRN pin current) and ID (measured via ΔVSNS). Higher MOSFET power dissipation produces proportionally higher TMR current, causing faster charging of CTMR and shorter fault timeout-ensuring the MOSFET stays within its safe operating area during severe transients.
What package and thermal characteristics apply to LTC4380IDD-3#PBF?
LTC4380IDD-3#PBF uses a 10-lead 3mm × 3mm plastic DFN (DD) package with exposed pad. Its thermal resistance is θJA = 43°C/W (JEDEC standard board). The exposed pad must be connected to a solid GND plane for optimal thermal performance and EMI suppression. Maximum junction temperature is 135°C.
LTC4380IDD-3#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)
LTC4380IDD-3#PBF FAQ
1.How can I place an order for LTC4380IDD-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380IDD-3#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 LTC4380IDD-3#PBF reliable?
The price and inventory of LTC4380IDD-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380IDD-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380IDD-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380IDD-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380IDD-3#PBF?
LTC4380IDD-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380IDD-3#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 LTC4380IDD-3#PBF?
For technical support, including LTC4380IDD-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380IDD-3#PBF requirements.
6.How does Aetrix verify that LTC4380IDD-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380IDD-3#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 LTC4380IDD-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380IDD-3#PBF?
All LTC4380IDD-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380IDD-3#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 LTC4380IDD-3#PBF part is unused and in its original packaging.
Return procedure for LTC4380IDD-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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