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Analog Devices Inc. LTC4380CDD-3#PBF
- Part No.:
- LTC4380CDD-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380CDD-3#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,501
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Product details
Overview
LTC4380CDD-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, reverse input, and overcurrent events. It operates from 4V to 72V input, delivers 8µA operating current, features adjustable gate clamp via external Zener, supports –60V reverse input protection, and latches off during faults. It is used in automotive battery-powered systems requiring robust transient immunity.
For engineers reviewing the LTC4380CDD-3#PBF datasheet, LTC4380CDD-3#PBF pinout, LTC4380CDD-3#PBF application, or LTC4380CDD-3#PBF equivalent, this page provides verified functional specifications, validated pin roles, confirmed AEC-Q100-compliant operation, and real-world design context for 12V/24V vehicle electronics, hot-swap interfaces, and industrial power rails.
Technical Context
The LTC4380CDD-3#PBF implements a multiplier-based fault timer where TMR pin current scales with both VDS (via DRN) and ID (via SNS–OUT), enabling MOSFET stress–adaptive turn-off timing. Its gate drive regulates to VOUT + 11.5V and lacks internal gate-to-GND clamp-clamping is fully external via VCC-to-GND Zener diode, supporting adjustable output clamping from 18V to 86V.
It uses a 1.05V ON-pin comparator for undervoltage detection and shutdown control, reducing quiescent current to 6µA in sleep mode. Fault behavior is latchoff (non-retry), requiring ON pin pulse <100µs or power cycle for recovery-distinct from auto-retry variants like LTC4380-2/-4.
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 regulators. |
| Quiescent Current | 8µA at TA = 25°C - enables always-on battery monitoring and low-power wake-up circuits. |
| Reverse Input Protection | –60V - withstands reverse battery connection without damage or latchup. |
| Current Limit Threshold | 50mV (rising), 62mV (severe short) - sets precise load current limit via external sense resistor RSNS. |
| Fault Timer Threshold | 1.215V on TMR pin - triggers MOSFET turn-off when integrated MOSFET stress exceeds safe operating area. |
| Gate Drive Compliance | VGATE = VOUT + 11.5V - ensures full enhancement of low-RDS(on) N-MOSFETs while limiting gate-source stress. |
| Temperature Range | 0°C to 70°C (C-grade) - qualified for commercial and under-hood non-critical automotive subsystems. |
Pinout & Package
Package: 10-Lead (3mm × 3mm) Plastic DFN (DD package), exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device Ground Reference | Primary return path for all internal circuitry; exposed pad must be connected to PCB ground for thermal and EMI performance. |
| VCC | Positive Supply Input | Accepts 4V–72V input; withstands –60V reverse; requires external Zener clamp for overvoltage protection (no internal clamp in -3 variant). |
| OUT | Output Voltage Sense | Monitors load-side voltage; internal 17V clamp between GATE–OUT prevents MOSFET gate-source overstress during transients. |
| SNS | Current Sense Input | Connects to high-side of sense resistor; controls current limit by regulating ΔVSNS to 50mV/62mV. |
| DRN | MOSFET Drain–Source Sense | Tracks VDS via external RDRN; feeds multiplier for stress-proportional TMR current. |
| GATE | N-MOSFET Gate Driver | Regulated charge pump output (VOUT + 11.5V); no internal GND clamp-external VCC Zener defines output clamp voltage. |
| ON | Enable/UVLO/Shutdown Control | 1.05V threshold; open-drain compatible; pulls device into 6µA shutdown when <0.99V. |
| SEL | Clamp Selection (No-Connect) | Must be tied to GND per datasheet for LTC4380-3; unused in adjustable-clamp configuration. |
| FLT | Fault Indicator Output | Open-drain logic-low signal asserted when TMR reaches 1.215V; requires external pull-up. |
| TMR | Fault Timer Integration Node | Capacitor-connected node; current scales with MOSFET power dissipation; controls turn-off timing and latch behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Clamping | Enabled by external Zener on VCC - supports user-defined clamp voltages from 18V to 86V, unlike fixed 31.5V/50V variants. |
| Latchoff Fault Response | No automatic retry - ensures system remains safely disabled after sustained overvoltage or overload until explicit reset via ON pin or power cycle. |
| MOSFET Stress–Adaptive Timing | TMR current multiplies VDS and ID - shortens fault timeout under high-power stress, preserving MOSFET SOA during load dump. |
| Reverse Input Immunity | –60V tolerance on VCC - eliminates need for upstream Schottky diode, reducing forward drop and heat in battery-fed systems. |
| Ultra-Low Operating Current | 8µA supply current - extends battery life in always-on telematics, CAN nodes, and event-triggered sensors. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Insertion |
|---|---|
Use Scenario: 12V vehicle electrical system subjected to ISO 7637-2 Pulse 5a (load dump up to 120V, 400ms). IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; limits output to ≤27V using VCC-Zener clamp; latches off if fault persists beyond CTMR timeout. Use Value: Prevents damage to 28V-rated ECUs and infotainment modules without derating or oversized TVS diodes. |
Use Scenario: Backplane insertion of PCIe cards or modular sensors into live 24V industrial rack. IC Role / Device Role / Timing Role: High-side switch controller with controlled turn-on ramp and inrush limiting via gate slew rate. Use Value: Eliminates contact arcing and bus voltage sag; enables zero-downtime module replacement in factory automation systems. |
| Battery-Powered Telematics | Industrial 24V Rail Protection |
Use Scenario: GPS tracker powered by vehicle battery with ignition-off monitoring capability. IC Role / Device Role / Timing Role: Always-on surge protector with 8µA quiescent draw; reverse-battery tolerant; UVLO disables load during cranking. Use Value: Extends standby runtime to >3 years on single 12Ah LiFePO₄ cell; survives jump-start transients and polarity reversal. |
Use Scenario: PLC I/O module exposed to 24V DC supply surges from relay coil flyback or motor commutation. IC Role / Device Role / Timing Role: Adjustable-clamp surge stopper driving 30V-rated MOSFET; clamps output to 45V using 56V Zener on VCC. Use Value: Replaces discrete crowbar + SCR solution with smaller footprint, no hold-on current, and programmable fault response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380CDD-1#PBF | Fixed 31.5V/50V internal gate clamp; SEL pin active; latchoff behavior identical. | Predefined clamp voltages only; no external Zener required but less flexible for custom clamp targets. | Select when standard 27V (12V systems) or 45V (24V systems) clamping suffices and layout simplicity is prioritized. |
| LTC4380CDD-2#PBF | Same fixed clamps as -1, but auto-retry fault behavior instead of latchoff. | Recovers automatically after cool-down; unsuitable where persistent fault indication or manual intervention is required. | Choose for self-healing systems like lighting controllers; avoid where safety-critical lockout is mandated. |
Compared with LTC4380CDD-1#PBF and LTC4380CDD-2#PBF, the LTC4380CDD-3#PBF trades internal clamp convenience for full external adjustability and deterministic latchoff-making it optimal for designs needing custom voltage limits and fail-safe shutdown without unintended restarts.
Availability
LTC4380CDD-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 24V rail hardening, and battery-powered telematics requiring stable component supply across extended production cycles.
Supply support for LTC4380CDD-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 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 ultra-low-quiescent surge protection ICs designed specifically for automotive and industrial power rails where reliability under transients, reverse polarity, and long-term battery operation are critical.
FAQ
What is the key functional difference between LTC4380CDD-3#PBF and LTC4380CDD-1#PBF?
The LTC4380CDD-3#PBF has no internal gate-to-GND clamp and relies entirely on an external Zener diode on the VCC pin to set the output clamp voltage-enabling user-defined clamping from 18V to 86V. In contrast, LTC4380CDD-1#PBF integrates selectable 31.5V/50V clamps and uses the SEL pin actively. Both share C-grade temperature range and latchoff fault behavior, but only LTC4380CDD-3#PBF supports fully adjustable clamping.
Does LTC4380CDD-3#PBF support reverse battery protection, and how is it implemented?
Yes, LTC4380CDD-3#PBF supports –60V reverse input protection on the VCC pin. This is achieved through internal clamping structures that prevent damage during reverse polarity events-eliminating the need for an upstream Schottky diode. The IC remains functional after reverse connection and resumes normal operation once correct polarity is restored, provided the ON pin remains enabled.
How does the fault timer in LTC4380CDD-3#PBF respond to different MOSFET stress conditions?
The fault timer in LTC4380CDD-3#PBF uses a multiplier that generates TMR pin current proportional to both VDS (via DRN) and ID (via SNS–OUT). During light overvoltage, TMR charges slowly; during heavy overload or high VDS, current increases significantly-shortening the time to 1.215V trip point. This adaptive timing keeps the external MOSFET within its Safe Operating Area without requiring manual SOA derating.
What is the recommended method to set the output clamp voltage for LTC4380CDD-3#PBF?
For LTC4380CDD-3#PBF, output clamp voltage is set by placing a Zener diode between VCC and GND. The Zener voltage (VZ) directly defines the maximum GATE voltage (≈ VZ + 13.5V), which in turn determines output clamp (≈ VZ + 13.5V – VTH). A 27V Zener yields ~27V output clamp with typical MOSFET VTH; use 1% tolerance Zeners and ensure power rating exceeds worst-case surge energy.
Is LTC4380CDD-3#PBF AEC-Q100 qualified, and what grade does it meet?
Yes, LTC4380CDD-3#PBF is AEC-Q100 qualified for automotive applications. As a C-grade part, it meets Grade 3 requirements (0°C to +70°C ambient operating temperature) and includes stress testing for humidity, thermal cycling, and ESD per AEC-Q100 Rev H. Full qualification reports are available from Analog Devices upon request for automotive program validation.
LTC4380CDD-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)
LTC4380CDD-3#PBF FAQ
1.How can I place an order for LTC4380CDD-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380CDD-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 LTC4380CDD-3#PBF reliable?
The price and inventory of LTC4380CDD-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 LTC4380CDD-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380CDD-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380CDD-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380CDD-3#PBF?
LTC4380CDD-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380CDD-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 LTC4380CDD-3#PBF?
For technical support, including LTC4380CDD-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380CDD-3#PBF requirements.
6.How does Aetrix verify that LTC4380CDD-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380CDD-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 LTC4380CDD-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380CDD-3#PBF?
All LTC4380CDD-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380CDD-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 LTC4380CDD-3#PBF part is unused and in its original packaging.
Return procedure for LTC4380CDD-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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