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Home > Products > Circuit Protection > Surge Suppression Ics

Analog Devices Inc. LTC4380IDD-2#PBF

Name: LTC4380IDD-2#PBF
Brand: Analog Devices Inc.
SKU: LTC4380IDD-2#PBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC4380IDD-2#PBF

Manufacturer:: Analog Devices Inc.

Category:: Surge Suppression Ics

Package:: 10-WFDFN Exposed Pad

Datasheet:: LTC4380IDD-2#PBF.pdf

Description:: IC LOW CUR SURGE STOPPER 10DFN

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Product details

Overview

LTC4380IDD-2#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 250Vpk), and overcurrent events. It features fixed 31.5V/50V gate clamp selection via SEL pin, 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-2#PBF datasheet, LTC4380IDD-2#PBF pinout, LTC4380IDD-2#PBF application, or LTC4380IDD-2#PBF equivalent, key selection criteria include gate clamp voltage selectability (31.5V/50V), auto-retry vs latch-off behavior, MOSFET stress acceleration via TMR-based multiplier, reverse input protection to −60V, and AEC-Q100 qualification for automotive environments.

Technical Context

The LTC4380IDD-2#PBF implements a multiplier-based fault timer where TMR pin current scales with both V_DS (via DRN) and I_D (via ΔV_SNS), enabling dynamic MOSFET safe operating area (SOA) enforcement. Its internal 20µA charge pump regulates GATE to V_OUT + 11.5V during normal operation, while clamping GATE to either 31.5V or 50V (SEL-dependent) during overvoltage.

It integrates undervoltage detection on the ON pin (1.05V threshold), open-drain FLT output signaling fault status, and adjustable turn-on timing (5ms typical propagation delay). The device supports back-to-back MOSFET configurations for reverse polarity protection and operates across 4V–72V input range with 6µA shutdown current.

Key Specifications

Parameter	Value and Actual Design Meaning
Operating Current	8µA typical - enables always-on battery-powered operation without significant drain
Input Voltage Range	4V to 72V - supports 12V and 24V/28V automotive and industrial rails
Gate Clamp Options	31.5V (SEL = GND) or 50V (SEL = VCC) - sets output clamp at ~27V or ~45V respectively
Fault Behavior	Auto-retry with cool-down - automatically recovers after fault clears, no manual reset required
Reverse Input Protection	−60V - withstands reverse battery connection without damage
Current Limit Threshold	50mV (rising), 62mV (severe short) - defines precise overcurrent trip point via sense resistor
Shutdown Current	6µA - reduces system power loss when disabled via ON pin

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-channel MOSFET gate driver	Drives external FET with regulated 11.5V above OUT; clamped to 31.5V/50V (SEL-selectable)
DRN	V_DS sense input	Tracks OUT; current through R_DRN proportional to MOSFET V_DS for stress-based timing
SNS	Current sense input	Monitors voltage drop across sense resistor; controls GATE to maintain ΔV_SNS = 50mV/62mV
OUT	Output voltage sense	Reference for GATE regulation and current sensing; requires ≥22µF local bypass
VCC	Supply input	4V–80V operating range; tolerates −60V reverse; protected by Zener or RC filter if >80V
ON	Enable/UV detect input	1.05V threshold; pulls low to enter 6µA shutdown; also serves as undervoltage monitor
FLT	Fault indicator output	Open-drain logic-low signal during fault; sinks up to 3mA; asserts when TMR ≥ 1.215V
SEL	Gate clamp voltage select	GND → 31.5V clamp; VCC/OUT → 50V clamp - only active on LTC4380-1/-2 variants
TMR	Fault timer capacitor node	Charges with MOSFET stress-proportional current; 1.215V threshold triggers shutdown and cool-down
GND	Device ground	Reference for all analog circuitry; exposed pad must be connected to PCB ground plane

Key Features

Feature	Design Value
Auto-retry fault recovery	Enables autonomous system recovery after transient overvoltage or overload without host intervention
Back-to-back MOSFET support	Eliminates Schottky diode forward drop and heat dissipation in reverse-polarity protection
MOSFET stress-accelerated timing	TMR current scales with V_DS × I_D, shortening fault timeout under high-power-dissipation conditions
Adjustable turn-on threshold	ON pin comparator allows custom UVLO setting or external enable control with 1.05V nominal threshold
AEC-Q100 qualified	Rated for automotive applications per Grade I (−40°C to +85°C) with validated reliability testing

Applications

Automotive Load Dump Protection	Industrial Battery-Powered Systems
Use Scenario: 12V vehicle electrical system subjected to ISO 16750-2 load dump transients up to 120V for 400ms. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; limits output to 27V using 31.5V gate clamp (SEL = GND). Use Value: Prevents downstream ECU damage without sacrificing efficiency - MOSFET remains fully enhanced during normal operation.	Use Scenario: Always-on remote sensor node powered by LiFePO₄ battery (2.5V–3.6V) with backup 12V supply. IC Role / Device Role / Timing Role: High-side switch with reverse polarity and overvoltage protection; enabled via ON pin monitoring battery voltage. Use Value: 8µA quiescent current extends battery life; −60V reverse tolerance eliminates need for external series diode.
Hot-Swap Power Distribution	Avionic Power Sequencing
Use Scenario: Insertion of a line-replaceable unit (LRU) into live 28V aircraft bus with potential for inrush and contact bounce. IC Role / Device Role / Timing Role: Controlled high-side switch with programmable soft-start via CTMR; limits inrush using GATE slew rate. Use Value: Prevents bus voltage sag and arcing during insertion; auto-retry ensures continuity after momentary faults.	Use Scenario: Dual-redundant 28V DC power system requiring coordinated startup and fault isolation between primary and secondary supplies. IC Role / Device Role / Timing Role: Independent surge protection per channel; FLT outputs feed OR'ed fault bus for centralized monitoring. Use Value: Enables fail-operational architecture - single LTC4380IDD-2#PBF fault does not disable entire system.

Automotive Load Dump Protection

Industrial Battery-Powered Systems

Use Scenario: 12V vehicle electrical system subjected to ISO 16750-2 load dump transients up to 120V for 400ms.

IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET; limits output to 27V using 31.5V gate clamp (SEL = GND).

Use Value: Prevents downstream ECU damage without sacrificing efficiency - MOSFET remains fully enhanced during normal operation.

Use Scenario: Always-on remote sensor node powered by LiFePO₄ battery (2.5V–3.6V) with backup 12V supply.

IC Role / Device Role / Timing Role: High-side switch with reverse polarity and overvoltage protection; enabled via ON pin monitoring battery voltage.

Use Value: 8µA quiescent current extends battery life; −60V reverse tolerance eliminates need for external series diode.

Hot-Swap Power Distribution

Avionic Power Sequencing

Use Scenario: Insertion of a line-replaceable unit (LRU) into live 28V aircraft bus with potential for inrush and contact bounce.

IC Role / Device Role / Timing Role: Controlled high-side switch with programmable soft-start via CTMR; limits inrush using GATE slew rate.

Use Value: Prevents bus voltage sag and arcing during insertion; auto-retry ensures continuity after momentary faults.

Use Scenario: Dual-redundant 28V DC power system requiring coordinated startup and fault isolation between primary and secondary supplies.

IC Role / Device Role / Timing Role: Independent surge protection per channel; FLT outputs feed OR'ed fault bus for centralized monitoring.

Use Value: Enables fail-operational architecture - single LTC4380IDD-2#PBF fault does not disable entire system.

Equivalent & Alternatives

The following parts are listed as comparable options for similar surge protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC4380IMS-2#PBF	Same functionality and specs, but in 10-lead MSOP package (5.0mm × 4.4mm) instead of 3mm × 3mm DFN	Requires PCB layout change; better thermal performance in low-airflow enclosures due to larger pad area	Select when board space permits larger footprint or thermal management is prioritized over miniaturization
TPS26632RGER	Integrated 60V eFuse with 2.5A continuous rating; no external MOSFET needed; fixed 42V overvoltage clamp; 25µA quiescent current	Lacks gate clamp selectability, auto-retry tuning, and MOSFET stress acceleration; simpler implementation but less flexible	Select when design prioritizes integration and BOM reduction over fine-grained transient response control

Compared with LTC4380IMS-2#PBF, the LTC4380IDD-2#PBF offers identical electrical behavior in a smaller, thermally optimized DFN package ideal for space-constrained automotive modules; compared with TPS26632RGER, it provides superior adaptability to diverse MOSFETs, precise clamp voltage selection, and dynamic SOA protection - at the cost of discrete component count.

Availability

LTC4380IDD-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial battery-powered systems, hot-swap power distribution, and avionic power sequencing requiring stable component supply and long-term lifecycle assurance.

Supply support for LTC4380IDD-2#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 industrial, automotive, communications, and healthcare markets.

The LTC4380 product line delivers ultra-low-quiescent-current surge protection ICs designed specifically for harsh automotive and industrial environments where reliability, wide input range, and MOSFET-level control are critical.

FAQ

What is the gate clamp voltage configuration for LTC4380IDD-2#PBF?

The LTC4380IDD-2#PBF supports two fixed internal gate clamp voltages: 31.5V when the SEL pin is tied to GND, and 50V when SEL is tied to VCC or OUT. This directly determines the output voltage limit (≈27V or ≈45V) during overvoltage events. The LTC4380IDD-2#PBF variant is part of the -2 family, which uses these internal clamps and features auto-retry fault behavior.

How does the fault timer in LTC4380IDD-2#PBF respond to MOSFET stress?

The LTC4380IDD-2#PBF's TMR pin current is generated by an internal multiplier proportional to both V_DS (sensed at DRN) and I_D (derived from ΔV_SNS). Higher MOSFET power dissipation increases TMR charging rate, reducing fault timeout duration - ensuring faster shutdown under severe stress and keeping the MOSFET within its safe operating area.

Can LTC4380IDD-2#PBF be used for reverse polarity protection?

Yes. The LTC4380IDD-2#PBF supports back-to-back N-channel MOSFET configurations driven from the GATE pin, enabling true bidirectional blocking. With proper layout, it withstands reverse input voltages down to −60V without damage, eliminating the forward voltage drop and thermal losses of Schottky diode solutions.

What is the operating temperature range of LTC4380IDD-2#PBF?

The LTC4380IDD-2#PBF is rated for operation from −40°C to +85°C (I-grade), making it suitable for under-hood automotive, industrial control, and outdoor equipment applications. Its DFN package features an exposed thermal pad for efficient heat dissipation in high-ambient environments.

How does LTC4380IDD-2#PBF differ from LTC4380IDD-1#PBF?

The LTC4380IDD-2#PBF implements auto-retry fault behavior - after a fault timeout, it enters a cool-down period and automatically restarts. In contrast, the LTC4380IDD-1#PBF latches off permanently until power is cycled or the ON pin is pulsed low for >100µs. Both share identical gate clamp options and electrical specs.

LTC4380IDD-2#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-2#PBF FAQ

1.How can I place an order for LTC4380IDD-2#PBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC4380IDD-2#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-2#PBF reliable?

The price and inventory of LTC4380IDD-2#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-2#PBF is usually 5 days.

3.What payment methods are accepted for LTC4380IDD-2#PBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380IDD-2#PBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC4380IDD-2#PBF?

LTC4380IDD-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC4380IDD-2#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-2#PBF?

For technical support, including LTC4380IDD-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380IDD-2#PBF requirements.

6.How does Aetrix verify that LTC4380IDD-2#PBF is sourced from the original manufacturer or authorized distributors?

All LTC4380IDD-2#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-2#PBF meets industry standards.

7.What is the process for return or replacement of LTC4380IDD-2#PBF?

All LTC4380IDD-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380IDD-2#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-2#PBF part is unused and in its original packaging.

Return procedure for LTC4380IDD-2#PBF:

1.Submit a request within 90 days.

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

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