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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LTC4380HDD-4#PBF

Name: LTC4380HDD-4#PBF
Brand: Analog Devices Inc.
SKU: LTC4380HDD-4#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC4380HDD-4#PBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 10-WFDFN Exposed Pad

Datasheet:: LTC4380HDD-4#PBF.pdf

Description:: IC LOW CUR SURGE STOPPER 10DFN

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Product details

Overview

LTC4380HDD-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 auto-retry fault behavior, adjustable gate clamp via external Zener, 8µA operating current, and −40°C to +125°C operation in a 10-lead 3mm × 3mm DFN package. Used in automotive battery protection circuits where sustained fault recovery is required.

For engineers reviewing the LTC4380HDD-4#PBF datasheet, LTC4380HDD-4#PBF pinout, LTC4380HDD-4#PBF application, or LTC4380HDD-4#PBF equivalent, key selection criteria include its auto-retry latchoff timing, external gate clamp configurability, −60V reverse input tolerance, 50mV/62mV current limit threshold, and compatibility with high-voltage N-channel MOSFETs in harsh automotive environments.

Technical Context

The LTC4380HDD-4#PBF implements a multiplier-based fault timer whose TMR pin current scales with both MOSFET V_DS (via DRN pin) and I_D (via SNS–OUT voltage), enabling dynamic SOA protection proportional to instantaneous power dissipation. Its GATE driver delivers regulated 11.5V above OUT with internal 13.5V-above-VCC compliance - no fixed internal gate-to-GND clamp.

It supports auto-retry behavior (unlike latchoff variants), entering a cool-down phase after fault shutdown: TMR discharges to 100mV before automatic restart. The ON pin serves dual role as undervoltage monitor (1.05V threshold) and shutdown control, reducing quiescent current to 6µA in shutdown mode.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Voltage Range	4V to 72V input; 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.
Reverse Input Protection	Withstands −60V on VCC; eliminates need for external Schottky diode in reverse-battery scenarios.
Current Limit Threshold	50mV (OUT > 3V), rising to 62mV (OUT < 1.5V); sets precise, temperature-stable load current limit via sense resistor.
Fault Timer Behavior	Auto-retry with cool-down: TMR pin cycles between 1.215V and 3.4V 15× before discharging to 100mV and restarting GATE drive.
Gate Drive Compliance	GATE limited to VCC + 13.5V only; requires external Zener on VCC to set output clamp voltage (e.g., 68V Zener → ~63V clamp).
Temperature Range	−40°C to +125°C ambient; qualified per AEC-Q100 for under-hood automotive use.

Pinout & Package

Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND, optional PCB connection).

Pin/Terminal	Circuit Role	Design Meaning
GND	Device ground reference	Reference for all internal comparators, amplifier inputs, and fault logic; exposed pad must be connected to system GND for thermal and electrical integrity.
VCC	Main supply input	Accepts 4V–72V; withstands −60V reverse; requires external Zener clamp for overvoltage protection above 72V.
OUT	Output voltage sense	Senses load-side voltage; internal clamp limits GATE–OUT to 17V; bypass with ≥22µF ceramic capacitor.
SNS	Current sense input	Monitors voltage drop across external sense resistor (SNS–OUT); sets 50mV/62mV current limit threshold.
DRN	MOSFET drain-source sense	Tracks V_DS of external N-MOSFET; current through R_DRN scales with V_DS, feeding multiplier for stress-accelerated fault timing.
GATE	N-MOSFET gate driver	Regulated 11.5V above OUT; clamped to VCC + 13.5V; requires ≥47nF capacitor + 33Ω series resistor for stability.
ON	Enable/UV/shutdown input	Turns device on when >1.05V; shuts down to 6µA when <0.99V; also detects undervoltage conditions.
FLT	Open-drain fault indicator	Pulls low during overvoltage/overcurrent faults; sinks up to 3mA; high-Z otherwise.
TMR	Fault timer capacitor node	Integrates scaled fault current; reaches 1.215V to trigger shutdown; cools down to 100mV before auto-restart.
SEL	Clamp select (not used)	Internally tied to GND for LTC4380-4; no effect on gate clamp - external Zener on VCC defines clamp voltage.

Key Features

Feature	Design Value
Auto-retry fault recovery	Enables autonomous restoration after transient overvoltage or overload without manual reset or power cycle.
Adjustable output voltage clamp	External Zener on VCC sets precise clamp voltage (e.g., 68V Zener → ~63V output limit), supporting custom system-level surge thresholds.
Reverse input tolerance to −60V	Eliminates need for series Schottky diode, reducing forward drop, heat, and board space in battery-connected systems.
Stress-accelerated fault timing	TMR current scales with MOSFET V_DS × I_D, shortening fault timeout during high-power-dissipation events to protect MOSFET SOA.
Ultra-low 8µA operating current	Permits direct connection to vehicle battery for always-on monitoring without measurable parasitic drain.

Applications

Automotive Load Dump Protection	Industrial 24V/48V Power Rail Protection
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 120V/250V load dump transients in 12V vehicle architectures. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; regulates GATE to clamp output at ~27V during 250V input surges. Use Value: Prevents damage to downstream 3.3V/5V regulators and microcontrollers by limiting output to safe levels while maintaining power continuity during short transients.	Use Scenario: Securing programmable logic controllers (PLCs) and motor drives against 100V+ switching surges on 24V/48V industrial DC rails. IC Role / Device Role / Timing Role: High-voltage surge limiter using external 100V N-MOSFET; leverages adjustable gate clamp to set 45V or 63V output ceiling. Use Value: Enables robust field-deployed equipment operation without derating or oversized input filters, reducing BOM cost and footprint.
Battery-Powered Telematics Module	Reverse-Battery Protected Gateway ECU
Use Scenario: Maintaining GPS/cellular connectivity in fleet tracking units powered directly from vehicle battery with zero maintenance sleep current. IC Role / Device Role / Timing Role: Always-on surge protector with 8µA IQ; monitors input continuously and blocks faults within microseconds. Use Value: Extends battery life beyond 5 years in disconnected vehicles while surviving jump-starts, alternator spikes, and accidental reverse connections.	Use Scenario: Protecting central gateway ECUs handling CAN/LIN/FlexRay communications from −14V reverse battery installation errors. IC Role / Device Role / Timing Role: Reverse-input tolerant front-end switch; uses internal −60V rating to block reverse current without external diodes. Use Value: Removes 0.3–0.5V forward drop and associated heat, improving efficiency and eliminating single-point failure risk of discrete diodes.

Automotive Load Dump Protection

Industrial 24V/48V Power Rail Protection

Use Scenario: Protecting infotainment ECUs and ADAS sensors from 120V/250V load dump transients in 12V vehicle architectures.

IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; regulates GATE to clamp output at ~27V during 250V input surges.

Use Value: Prevents damage to downstream 3.3V/5V regulators and microcontrollers by limiting output to safe levels while maintaining power continuity during short transients.

Use Scenario: Securing programmable logic controllers (PLCs) and motor drives against 100V+ switching surges on 24V/48V industrial DC rails.

IC Role / Device Role / Timing Role: High-voltage surge limiter using external 100V N-MOSFET; leverages adjustable gate clamp to set 45V or 63V output ceiling.

Use Value: Enables robust field-deployed equipment operation without derating or oversized input filters, reducing BOM cost and footprint.

Battery-Powered Telematics Module

Reverse-Battery Protected Gateway ECU

Use Scenario: Maintaining GPS/cellular connectivity in fleet tracking units powered directly from vehicle battery with zero maintenance sleep current.

IC Role / Device Role / Timing Role: Always-on surge protector with 8µA IQ; monitors input continuously and blocks faults within microseconds.

Use Value: Extends battery life beyond 5 years in disconnected vehicles while surviving jump-starts, alternator spikes, and accidental reverse connections.

Use Scenario: Protecting central gateway ECUs handling CAN/LIN/FlexRay communications from −14V reverse battery installation errors.

IC Role / Device Role / Timing Role: Reverse-input tolerant front-end switch; uses internal −60V rating to block reverse current without external diodes.

Use Value: Removes 0.3–0.5V forward drop and associated heat, improving efficiency and eliminating single-point failure risk of discrete diodes.

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	Fixed internal 31.5V/50V gate clamp (SEL-selectable); same auto-retry behavior and −40°C to +125°C rating.	Predefined clamp voltages simplify design for standard 12V/24V systems but lack flexibility for custom clamp targets.	Select when output clamp voltage is fixed at 27V or 45V and external Zener management is undesirable.
LTC4380IMS-4#WPBF	Same functional spec as LTC4380HDD-4#PBF but in MSOP-10 package; automotive-grade (#W) with enhanced reliability reporting.	MSOP offers easier prototyping and rework; DFN provides superior thermal performance and smaller footprint for production.	Select MSOP variant for evaluation or low-volume automotive programs requiring full AEC-Q100 documentation traceability.

Compared with LTC4380HDD-4#PBF, the LTC4380HDD-2#PBF removes external Zener dependency but sacrifices clamp voltage flexibility, while the LTC4380IMS-4#WPBF retains identical functionality in a larger, hand-solderable package with formal automotive qualification reports - ideal for validation phases.

Availability

LTC4380HDD-4#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 72V rail conditioning, and always-on telematics modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LTC4380HDD-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 safety markets.

The LTC4380 product line delivers robust, low-I_Q surge protection ICs designed specifically for automotive and industrial power front-ends where reliability under voltage transients and reverse polarity is non-negotiable.

FAQ

What is the key functional difference between LTC4380HDD-4#PBF and LTC4380HDD-1#PBF?

The LTC4380HDD-4#PBF implements auto-retry fault behavior with cool-down timing and uses externally adjustable gate clamping (no internal clamp), whereas LTC4380HDD-1#PBF latches off permanently after fault and uses fixed 31.5V/50V internal gate clamps selectable via SEL pin. Both share the same H-grade temperature range (−40°C to +125°C) and DFN package.

How do I set the output voltage clamp for LTC4380HDD-4#PBF?

For LTC4380HDD-4#PBF, the output clamp is set by placing a Zener diode between VCC and GND. With GATE regulated to VOUT + 11.5V and VCC clamped at V_Z, the maximum GATE voltage becomes V_Z + 13.5V, yielding an output clamp ≈ V_Z + 13.5V − V_TH (MOSFET threshold). A 68V Zener yields ~63V clamp assuming 5V V_TH. No SEL pin configuration is needed.

Does LTC4380HDD-4#PBF support reverse input protection, and what is its rating?

Yes, LTC4380HDD-4#PBF supports reverse input protection with a guaranteed rating of −60V on the VCC pin. This allows direct connection to vehicle battery terminals without external reverse-polarity protection diodes, eliminating forward voltage drop and thermal losses while simplifying layout.

What is the minimum recommended CTMR capacitor value and type for reliable auto-retry operation of LTC4380HDD-4#PBF?

Analog Devices recommends a minimum 10V-rated X7R ceramic capacitor for CTMR on LTC4380HDD-4#PBF to ensure stable timing across temperature and voltage. Typical values range from 1µF to 10µF; an 8.2µF capacitor (as shown in Figure 1) provides ~1.5s fault timeout and ~15s cool-down before auto-restart under moderate stress conditions.

Can LTC4380HDD-4#PBF drive back-to-back N-channel MOSFETs for true bidirectional reverse protection?

No - LTC4380HDD-4#PBF drives a single N-channel MOSFET in high-side configuration only. While it supports reverse input protection on VCC, it does not provide gate drive capability for a second MOSFET. For bidirectional blocking, external circuitry (e.g., dual N-MOSFET + charge pump) is required; LTC4380HDD-4#PBF itself controls only one pass device.

LTC4380HDD-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)

LTC4380HDD-4#PBF FAQ

1.How can I place an order for LTC4380HDD-4#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC4380HDD-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 LTC4380HDD-4#PBF reliable?

The price and inventory of LTC4380HDD-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 LTC4380HDD-4#PBF is usually 5 days.

3.What payment methods are accepted for LTC4380HDD-4#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HDD-4#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC4380HDD-4#PBF?

LTC4380HDD-4#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC4380HDD-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 LTC4380HDD-4#PBF?

For technical support, including LTC4380HDD-4#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HDD-4#PBF requirements.

6.How does Aetrix verify that LTC4380HDD-4#PBF is sourced from the original manufacturer or authorized distributors?

All LTC4380HDD-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 LTC4380HDD-4#PBF meets industry standards.

7.What is the process for return or replacement of LTC4380HDD-4#PBF?

All LTC4380HDD-4#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HDD-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 LTC4380HDD-4#PBF part is unused and in its original packaging.

Return procedure for LTC4380HDD-4#PBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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