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Analog Devices Inc. LTC4380CDD-4#PBF
- Part No.:
- LTC4380CDD-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380CDD-4#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
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Product details
Overview
LTC4380CDD-4#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, reverse input, overvoltage (up to 72V input), and overcurrent events. It features adjustable gate clamp voltage, 8µA operating current, 50mV current limit threshold, and auto-retry fault behavior. Used in 12V/24V battery-powered systems requiring robust transient protection.
For engineers reviewing the LTC4380CDD-4#PBF datasheet, LTC4380CDD-4#PBF pinout, LTC4380CDD-4#PBF application, or LTC4380CDD-4#PBF equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical timing and protection parameters - all confirmed for the C-grade DFN variant with auto-retry and externally adjustable gate clamp.
Technical Context
The LTC4380CDD-4#PBF implements a multiplier-based fault timer where TMR pin current scales with both MOSFET VDS (sensed at DRN) and ID (via ΔVSNS), enabling dynamic SOA protection. Its GATE driver regulates to VOUT + 11.5V and lacks internal gate-to-GND clamp - relying instead on external Zener clamping at VCC to set output voltage limit.
It supports reverse input protection to –60V, uses an ON pin comparator for undervoltage detection (1.05V threshold) and shutdown control, and enters cool-down mode upon fault with automatic restart after TMR discharges to 100mV - distinguishing it from latch-off variants like LTC4380CDD-3#PBF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input - supports 12V, 24V, and 28V automotive/industrial rails with headroom for transients. |
| Quiescent Current | 8µA at 25°C - enables always-on operation in battery-backed systems without significant drain. |
| Current Limit Threshold | 50mV (rising to 62mV when OUT < 1.5V) - sets precise, temperature-stable load current limit via external sense resistor. |
| Fault Timer Behavior | Auto-retry with cool-down phase - automatically recovers after fault clears, reducing system downtime vs. latch-off variants. |
| GATE Clamp Architecture | No internal gate-to-GND clamp - requires external Zener at VCC to define output clamp voltage (e.g., 68V Zener → ~56V clamp). |
| Reverse Input Rating | –60V on VCC - enables direct connection to reversed battery terminals without damage. |
| Package | 10-lead (3mm × 3mm) DFN - thermally enhanced, surface-mount package with exposed pad (GND) for power dissipation. |
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 and thermal pad connection | Primary return path; exposed pad must be soldered to PCB ground plane for thermal performance and EMI control. |
| VCC | Main supply input (4V–72V) | Accepts wide-input rail; withstands –60V reverse; requires external Zener for overvoltage clamping in LTC4380-4 variants. |
| OUT | Output voltage sense node | Connects to load-side of sense resistor; internal clamp limits GATE–OUT to 17V; bypass with ≥22µF ceramic capacitor. |
| SNS | Current sense input (SNS–OUT = ΔVSNS) | Monitors load current via external sense resistor; 50mV threshold enables accurate current limiting independent of MOSFET RDS(on). |
| DRN | MOSFET drain-source voltage sense | Tracks VDS via external resistor (RDRN); feeds multiplier to accelerate fault timer during high-power stress. |
| GATE | N-MOSFET gate drive output | Regulated to VOUT + 11.5V; no internal GND clamp - output voltage limit defined by external VCC Zener. |
| ON | Enable/shutdown and UVLO input | Turns device on above 1.05V; pulls into 6µA shutdown below threshold; tolerates –60V to 80V. |
| SEL | Gate clamp selection (fixed only) | Internally tied to GND in LTC4380-4 - disables fixed clamp options; used only in -1/-2 variants. |
| TMR | Fault timer integrator node | Capacitor-connected node; charges at rate proportional to MOSFET power dissipation; triggers FLT at 1.215V. |
| FLT | Open-drain fault indicator | Pulls low during fault; releases high after cool-down completes or ON pin reset; sinks up to 3mA. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage clamp | Set via external Zener diode on VCC - enables precise clamp tuning (e.g., 27V, 45V, 60V) without changing IC variant. |
| Auto-retry fault recovery | Eliminates manual reset requirement - cools MOSFET then automatically restores power after transient clears. |
| Reverse input protection to –60V | Enables direct integration in battery-connected systems without external diode or polarity protection circuitry. |
| Dynamic MOSFET SOA protection | TMR current scales with VDS × ID, shortening fault timeout under high-stress conditions to prevent thermal runaway. |
| Ultra-low 8µA quiescent current | Permits permanent connection to vehicle battery without measurable parasitic drain over time. |
Applications
| Automotive Load Dump Protection | Industrial Power Input Conditioning |
|---|---|
|
Use Scenario: Protecting infotainment ECUs from 12V vehicle battery surges up to 250V during alternator load dump. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET as high-side switch; limits output to safe level (e.g., 27V) using Zener-clamped VCC. Use Value: Prevents damage to downstream 3.3V/5V regulators and microcontrollers without sacrificing always-on functionality. |
Use Scenario: Securing programmable logic controllers (PLCs) powered from unregulated 24V DC industrial supplies prone to line transients. IC Role / Device Role / Timing Role: High-side protection controller with adjustable fault timer; senses overcurrent via SNS/OUT and shuts off MOSFET before fuse blows. Use Value: Enables maintenance-free operation with automatic recovery after short-circuit faults - no operator intervention required. |
| Battery-Powered Telematics | Avionic Power Sequencing |
|
Use Scenario: Maintaining GPS tracker operation during vehicle ignition cycles and battery disconnect/reconnect events. IC Role / Device Role / Timing Role: Reverse-input-tolerant enable switch; ON pin monitors battery voltage and initiates graceful shutdown below 9V. Use Value: Extends usable battery life via 8µA quiescent draw and prevents brownout-induced data corruption. |
Use Scenario: Safeguarding flight control sensors against 28V aircraft bus transients exceeding MIL-STD-704F limits. IC Role / Device Role / Timing Role: Precision surge limiter with AEC-Q100 qualified C-grade DFN package; TMR capacitor sets fault holdoff to match avionic safety margins. Use Value: Meets stringent reliability requirements while eliminating discrete TVS and crowbar circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380CDD-2#PBF | Fixed 31.5V/50V internal gate clamp; same auto-retry behavior but no external Zener dependency | Preferred for 12V/24V systems where clamp voltage is known and stable; eliminates Zener selection effort | Select when fixed clamp simplifies BOM and layout; avoid if variable clamp or >50V output limit needed |
| LTC4380CMS-4#PBF | Same functionality and specs, but in 10-lead MSOP package (5.0mm × 4.4mm) with higher θJA (160°C/W) | Better suited for prototyping or low-volume designs where DFN rework is challenging | Choose for hand-soldering feasibility or legacy board compatibility; accept larger footprint and reduced thermal performance |
Compared with LTC4380CDD-2#PBF, the LTC4380CDD-4#PBF trades internal clamp simplicity for full output voltage flexibility via external Zener, while compared with LTC4380CMS-4#PBF, it offers superior thermal dissipation and smaller PCB area in the DFN package - critical for space-constrained automotive modules.
Availability
LTC4380CDD-4#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V input conditioning, and battery-powered telematics requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC4380CDD-4#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, and automotive markets.
The LTC4380 product line delivers robust, low-quiescent-current surge protection ICs designed specifically for automotive, avionic, and harsh-environment power systems where reliability under voltage transients is non-negotiable.
FAQ
What is the key functional difference between LTC4380CDD-4#PBF and LTC4380CDD-2#PBF?
The LTC4380CDD-4#PBF has no internal gate-to-GND clamp and relies on external Zener clamping at VCC to define output voltage limit, enabling fully adjustable clamp levels. In contrast, LTC4380CDD-2#PBF integrates selectable 31.5V/50V internal clamps. Both share auto-retry fault behavior, but LTC4380CDD-4#PBF offers greater design flexibility for non-standard clamp voltages.
How does the LTC4380CDD-4#PBF achieve reverse input protection to –60V?
The LTC4380CDD-4#PBF achieves –60V reverse input protection through ruggedized internal ESD structures and rail-to-rail pin tolerance on VCC, ON, and SEL pins - all rated from –60V to 80V. No external components are needed; the IC remains functional and undamaged when the input is reversed, making it ideal for battery-connected applications where polarity errors may occur.
What capacitor value is recommended for the TMR pin in LTC4380CDD-4#PBF for a typical 12V automotive load dump application?
For a typical 12V automotive load dump application with ~27V output clamping, an 8.2µF X7R ceramic capacitor rated ≥10V is recommended for the TMR pin. This value provides sufficient fault holdoff time (~100ms) to ride through standard ISO 7637-2 Pulse 5a transients while allowing rapid cool-down and auto-restart once the surge ends - as validated in the LTC4380 datasheet Figure 1.
Can LTC4380CDD-4#PBF drive back-to-back N-channel MOSFETs for bidirectional blocking?
Yes, the LTC4380CDD-4#PBF can drive back-to-back N-channel MOSFETs for reverse input protection. Its GATE pin drives the first MOSFET's gate while the second MOSFET is configured source-to-source, eliminating Schottky diode forward drop and heat. The IC's ability to regulate GATE relative to OUT - not GND - makes it uniquely suited for this topology, unlike gate drivers referenced solely to ground.
What is the minimum sense resistor value required for 1A current limiting with LTC4380CDD-4#PBF?
With a 50mV current limit threshold, the minimum sense resistor value for 1A current limiting is RSENSE = 50mV / 1A = 50mΩ. For improved accuracy and noise immunity, a 50mΩ to 100mΩ, 1% tolerance, low-inductance metal foil or thick-film resistor is recommended - placed directly between SNS and OUT with Kelvin connections to minimize PCB trace resistance error.
LTC4380CDD-4#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)
LTC4380CDD-4#PBF FAQ
1.How can I place an order for LTC4380CDD-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380CDD-4#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 LTC4380CDD-4#PBF reliable?
The price and inventory of LTC4380CDD-4#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380CDD-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380CDD-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380CDD-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380CDD-4#PBF?
LTC4380CDD-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380CDD-4#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 LTC4380CDD-4#PBF?
For technical support, including LTC4380CDD-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380CDD-4#PBF requirements.
6.How does Aetrix verify that LTC4380CDD-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380CDD-4#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 LTC4380CDD-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380CDD-4#PBF?
All LTC4380CDD-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380CDD-4#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 LTC4380CDD-4#PBF part is unused and in its original packaging.
Return procedure for LTC4380CDD-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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