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Analog Devices Inc. LTC4380IDD-4#PBF
- Part No.:
- LTC4380IDD-4#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC4380IDD-4#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:697
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Product details
Overview
LTC4380IDD-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 faults. It features adjustable gate clamp voltage, 8µA operating current, –40°C to 85°C industrial temperature range, and auto-retry fault behavior. Used in 12V/24V battery-powered systems requiring robust transient protection.
For engineers reviewing the LTC4380IDD-4#PBF datasheet, LTC4380IDD-4#PBF pinout, LTC4380IDD-4#PBF application, or LTC4380IDD-4#PBF equivalent, key selection criteria include its externally adjustable gate clamp architecture, MOSFET stress-accelerated fault timer, reverse input protection to –60V, and compatibility with high-side N-MOSFET configurations for minimal conduction loss.
Technical Context
The LTC4380IDD-4#PBF implements a multiplier-based fault timer where TMR pin current scales with both VDS (via DRN pin) and ID (via SNS–OUT differential), enabling dynamic MOSFET safe-operating-area (SOA) enforcement. Its GATE driver operates as a regulated charge pump (11.5V above OUT) without internal gate-to-GND clamp - gate voltage limit is set solely by external Zener clamping at VCC.
It supports auto-retry fault recovery via TMR cool-down cycling (15 cycles between 1.215V and 3.4V), with FLT open-drain output signaling active faults. 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 - supports 12V, 24V, and 28V automotive/industrial rails with headroom for transients |
| Quiescent Current | 8µA typical - enables always-on battery-backed systems without significant drain |
| Fault Timer Basis | TMR current proportional to MOSFET power dissipation (VDS × ID) - shortens turn-off time under severe stress |
| Reverse Input Protection | Withstands –60V on VCC - eliminates need for external series diode or TVS on input |
| Gate Drive Compliance | GATE limited to VCC + 13.5V - requires external Zener at VCC to define output clamp voltage (e.g., 68V Zener → ~55V clamp) |
| Current Limit Threshold | 50mV (rising), 62mV (severe short, OUT < 1.5V) - sets precise, temperature-stable current limit via sense resistor |
| Temperature Range | –40°C to +85°C - qualified for industrial and extended-temperature automotive subsystems |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE | N-MOSFET gate drive output | Regulated 20µA charge pump (VGATE = VOUT + 11.5V); clamped to VCC + 13.5V - requires external Zener at VCC for output voltage limiting |
| DRN | VDS sense input | Current sourced proportional to (VDRN – VOUT) - feeds multiplier for MOSFET stress-dependent fault timing |
| SNS | Current sense input | Monitors voltage across external sense resistor (SNS–OUT); controls GATE to hold ΔVSNS = 50mV/62mV |
| OUT | Output voltage sense reference | Low-impedance return for SNS and GATE regulation; bypass with ≥22µF ceramic capacitor |
| VCC | Primary supply input | Accepts 4V–72V; withstands –60V reverse; external Zener required for overvoltage clamping (no internal clamp in -4 version) |
| ON | Enable/UVLO/shutdown input | 1.05V threshold; internal 1MΩ pull-up; pulls device into 6µA shutdown when < 0.99V |
| SEL | Clamp select (not used in -4) | Must be tied to GND for LTC4380-4 - disables internal clamp logic; no functional role in this variant |
| TMR | Fault timer integrator node | Capacitor-connected node; charges with MOSFET-power-proportional current; trips at 1.215V; auto-retry cool-down cycling enabled |
| FLT | Open-drain fault indicator | Pulls low during fault (TMR ≥ 1.215V); releases high after auto-retry completion or ON pin reset |
| GND | Device ground / Exposed pad | Reference for all analog circuitry; exposed pad must be connected to PCB ground plane for thermal and electrical performance |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable gate clamp | Enables precise output voltage limiting (e.g., 27V, 45V, or custom values) using only a Zener diode on VCC - no internal clamp interference |
| MOSFET stress-accelerated fault timer | TMR current scales with real-time VDS × ID, shortening fault timeout under high-power-dissipation conditions to keep MOSFET within SOA |
| Auto-retry fault recovery | After fault shutdown, performs 15-cycle TMR cool-down (3.4V ↔ 1.215V) then restarts automatically - avoids manual reset in inaccessible systems |
| Reverse input protection to –60V | Allows direct connection to battery terminals without series diode - eliminates 0.3–0.7V drop and associated heat in always-on applications |
| Ultra-low 8µA operating current | Permits use in permanent-installation battery systems (e.g., telematics, ECU backup rails) with multi-year standby life |
Applications
| Automotive Load Dump Protection | Industrial Battery Backup Power |
|---|---|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 12V vehicle battery system surges up to 250V during alternator load dump events. IC Role / Device Role / Timing Role: Surge stopper controlling high-side N-MOSFET; limits output to ≤27V via Zener-clamped GATE; responds within microseconds to rising VDS. Use Value: Prevents damage to 3.3V/5V downstream logic without derating or oversized TVS, while maintaining <8µA quiescent draw during normal operation. | Use Scenario: Maintaining power to real-time clocks, SRAM, and security modules during main supply interruption in factory automation controllers. IC Role / Device Role / Timing Role: High-side switch with reverse polarity protection and controlled inrush; ON pin enables graceful shutdown before battery depletion. Use Value: Eliminates Schottky diode forward drop (saving >0.4V at 1A), extends backup runtime, and blocks –60V reverse battery connection errors. |
| Hot-Swap Power Distribution | Avionic Power Sequencing |
Use Scenario: Inserting field-replaceable modules into live 24V/28V aircraft or rail transport backplanes without disrupting upstream power. IC Role / Device Role / Timing Role: Inrush-limited high-side switch; GATE ramp rate controlled by 20µA charge pump and external CGATE; TMR prevents latch-up during plug-in transients. Use Value: Limits peak inrush to safe levels (<1A) while sustaining full load current post-startup - avoids bus voltage sag and false fault triggers. | Use Scenario: Enabling critical flight control subsystems only after primary avionics power stabilizes and meets UVLO thresholds. IC Role / Device Role / Timing Role: Precision undervoltage monitor (1.05V ON threshold with 45mV hysteresis) combined with controlled MOSFET turn-on delay (~5ms). Use Value: Ensures clean power sequencing without brownout-induced resets; 6µA shutdown mode preserves auxiliary battery during pre-flight checks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380IMS-4#PBF | Same functionality and specs, but in 10-lead MSOP package (5.0mm × 4.4mm vs. DFN's 3.0mm × 3.0mm); θJA = 160°C/W vs. 43°C/W | Preferred where hand-soldering or legacy layout compatibility is required; less suitable for space-constrained automotive modules | Select for prototyping or low-volume designs needing easier rework; avoid in thermally dense or high-reliability automotive modules |
| TPS26631RGER | Integrated 60V eFuse with fixed 2.7A current limit, 1.2ms fast trip, no adjustable gate clamp or VDS-based timer; 25µA quiescent current | Targets simpler overcurrent-only protection; lacks load-dump voltage clamping and reverse-input tolerance | Choose only if system faces only overload faults (not transients/reverse polarity); not a functional substitute for load dump or –60V protection |
Compared with LTC4380IMS-4#PBF, the LTC4380IDD-4#PBF offers superior thermal performance and smaller footprint for automotive modules, while TPS26631RGER lacks critical surge-handling capabilities - making LTC4380IDD-4#PBF the sole option for applications requiring coordinated overvoltage, overcurrent, and reverse-polarity protection with ultra-low IQ.
Availability
LTC4380IDD-4#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial battery backup power, hot-swap power distribution, and avionic power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4380IDD-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, 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 delivers ultra-low-IQ surge protection ICs designed specifically for harsh-environment power path management - emphasizing survivability during automotive transients, reverse battery events, and sustained overloads without compromising standby efficiency.
FAQ
What is the gate clamp architecture of the LTC4380IDD-4#PBF?
The LTC4380IDD-4#PBF has no internal gate-to-GND clamp. Its GATE pin is regulated to VOUT + 11.5V and clamped to VCC + 13.5V. Output voltage limiting is achieved exclusively by placing a Zener diode between VCC and GND - for example, a 68V Zener yields ~55V output clamp. This architecture enables fully customizable clamping without internal voltage constraints.
How does the fault timer in the LTC4380IDD-4#PBF respond to different fault severities?
The LTC4380IDD-4#PBF fault timer uses a multiplier that sources TMR current proportional to both VDS (via DRN) and ID (via SNS–OUT). During mild overvoltage, TMR charges slowly; during heavy overload or high VDS, current increases significantly - reducing fault timeout to prevent MOSFET thermal runaway. This ensures shorter protection response under higher stress.
Can the LTC4380IDD-4#PBF be used without an external MOSFET?
No. The LTC4380IDD-4#PBF is a controller IC only and requires an external N-channel MOSFET as the pass device. It provides gate drive, fault sensing, and timing - but does not integrate power FETs. Typical selections include FDB33N25 or similar 60V+ logic-level N-MOSFETs with RDS(on) < 10mΩ for low-loss operation.
What is the purpose of the SEL pin on the LTC4380IDD-4#PBF?
On the LTC4380IDD-4#PBF, the SEL pin must be tied to GND per datasheet requirements. Unlike -1/-2 versions, the -4 variant has no internal gate clamp - so SEL is unused and serves only as a no-connect placeholder. Leaving it floating or connecting to VCC may cause undefined behavior; grounding ensures correct operation.
Does the LTC4380IDD-4#PBF support reverse input protection, and how is it implemented?
Yes. The LTC4380IDD-4#PBF withstands –60V on the VCC pin with ON and SEL grounded, enabling direct reverse-battery connection. It blocks reverse current flow using the external N-MOSFET's body diode in conjunction with GATE control - eliminating need for a series Schottky diode and its associated voltage drop and power loss.
LTC4380IDD-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)
LTC4380IDD-4#PBF FAQ
1.How can I place an order for LTC4380IDD-4#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380IDD-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 LTC4380IDD-4#PBF reliable?
The price and inventory of LTC4380IDD-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 LTC4380IDD-4#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380IDD-4#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380IDD-4#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380IDD-4#PBF?
LTC4380IDD-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380IDD-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 LTC4380IDD-4#PBF?
For technical support, including LTC4380IDD-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380IDD-4#PBF requirements.
6.How does Aetrix verify that LTC4380IDD-4#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380IDD-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 LTC4380IDD-4#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380IDD-4#PBF?
All LTC4380IDD-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380IDD-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 LTC4380IDD-4#PBF part is unused and in its original packaging.
Return procedure for LTC4380IDD-4#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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