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Analog Devices Inc. LTC4380CMS-3#TRPBF
- Part No.:
- LTC4380CMS-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4380CMS-3#TRPBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC4380CMS-3#TRPBF 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 features 8µA operating current, 4V–72V input range, adjustable gate clamp (via external Zener), latchoff fault behavior, and reverse input protection to –60V - deployed in 12V/24V battery-powered systems requiring robust transient immunity.
For engineers reviewing the LTC4380CMS-3#TRPBF datasheet, LTC4380CMS-3#TRPBF pinout, LTC4380CMS-3#TRPBF application, or LTC4380CMS-3#TRPBF equivalent, key selection criteria include its latchoff response to overvoltage/overcurrent faults, absence of internal gate-to-GND clamp (requiring external VCC clamping), MSOP-10 package compatibility, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC4380CMS-3#TRPBF 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 proportional to instantaneous power dissipation. Its GATE driver delivers regulated 11.5V above OUT and clamps to VCC + 13.5V - no internal 31.5V/50V gate-to-GND clamp, distinguishing it from -1/-2 variants.
It uses an ON pin comparator (1.05V threshold, 45mV hysteresis) for undervoltage detection and shutdown control, reducing quiescent current to 6µA. Fault detection triggers at TMR = 1.215V; for LTC4380-3, this causes latched-off state until ON pin is pulsed low ≥100µs or power cycled - no auto-retry or cool-down phase.
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 regulation. |
| Quiescent Current | 8µA typical - enables always-on battery-backed systems with multi-year standby life. |
| Fault Response | Latchoff only - output remains disabled after overvoltage or overcurrent until manual reset via ON pin pulse or power cycle. |
| Gate Drive Compliance | VGATE limited to VCC + 13.5V - requires external Zener on VCC to set precise output clamp voltage (e.g., 68V Zener → ~56V clamp). |
| Reverse Input Protection | Withstands –60V on VCC - eliminates need for upstream Schottky diode in reverse-battery scenarios. |
| Current Limit Threshold | 50mV (OUT > 3V) rising to 62mV (OUT < 1.5V) - sets accurate, temperature-stable load current limit via sense resistor. |
| Package | 10-Lead MSOP - surface-mount footprint compatible with automated assembly and thermal relief via exposed pad (GND). |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm body, 0.5mm pitch), exposed pad connected to GND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device ground reference and thermal path | Must be low-impedance connection to PCB ground plane; exposed pad is electrically GND. |
| OUT | Output voltage sense node | Connects to source-side of sense resistor; internal clamp limits GATE–OUT to 17V - critical for MOSFET gate stress control. |
| SNS | Current sense input | Connects to load-side of sense resistor; ΔVSNS = 50mV sets current limit - accuracy directly determines load protection precision. |
| DRN | MOSFET drain-source voltage monitor | Current into DRN ∝ VDS; used with SNS signal in internal multiplier to accelerate fault timing under high MOSFET stress. |
| GATE | N-MOSFET gate drive output | Regulated 11.5V above OUT; clamped to VCC + 13.5V - external Zener on VCC defines final output clamp level. |
| VCC | Positive supply input | Operates from 4V–72V; withstands –60V reverse - must be Zener-clamped during >72V transients to prevent GATE overvoltage. |
| ON | Enable/shutdown and UVLO input | 1.05V threshold with 45mV hysteresis; pulling below 0.99V shuts down IC, reducing IQ to 6µA. |
| FLT | Open-drain fault indicator | Pulls low when TMR reaches 1.215V; remains low until reset - signals persistent fault condition to system controller. |
| TMR | Fault timer integration node | Capacitor to GND sets fault timeout; current scales with MOSFET power - enables adaptive SOA protection. |
| SEL | Gate clamp select (no function in -3) | Internally tied to GND for LTC4380-3; unused - no effect on operation or clamp voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Clamp via External Zener | Enables precise output voltage limiting (e.g., 27V, 45V, 56V) by clamping VCC - required since LTC4380-3 lacks internal gate-to-GND clamp. |
| Latchoff Fault Behavior | Prevents uncontrolled cycling during sustained faults - mandates deliberate system-level reset, improving reliability in safety-critical automotive modules. |
| Reverse Input Protection to –60V | Eliminates need for series Schottky diode - reduces forward drop, heat, and BOM count in battery-connected applications. |
| Dynamic MOSFET Stress Acceleration | TMR current scales with VDS × ID, shortening fault timeout under high-power dissipation - keeps MOSFET within SOA during severe transients. |
| Ultra-Low 8µA Operating Current | Supports permanent installation in vehicle infotainment, telematics, and ADAS modules powered directly from battery without wake-up circuitry. |
Applications
| Automotive Load Dump Protection | Reverse Battery Protection |
|---|---|
Use Scenario: 12V vehicle electrical system subjected to ISO 7637-2 Pulse 5a (120V/100ms) load dump transients. IC Role / Device Role / Timing Role: Surge stopper controlling high-side N-MOSFET to clamp output at 27V and limit energy delivered to ECU. Use Value: Prevents damage to downstream 3.3V/5V regulators and microcontrollers without derating or oversized TVS devices. |
Use Scenario: Infotainment head unit installed in vehicles where battery terminals may be reversed during service. IC Role / Device Role / Timing Role: Reverse-input protector using GATE-driven back-to-back MOSFET configuration. Use Value: Blocks –12V/–24V without 0.3V forward drop or thermal runaway risk - replaces lossy Schottky solution. |
| Industrial Power Sequencing | Avionic Hot-Swap Module |
Use Scenario: Programmable logic controller (PLC) I/O module requiring controlled power-up and fault isolation. IC Role / Device Role / Timing Role: High-side switch with programmable current limit and latchoff fault response. Use Value: Enables deterministic power sequencing and prevents cascading failures during field-wiring shorts. |
Use Scenario: Line-replaceable unit (LRU) in aircraft avionics needing live insertion into 28V DC bus. IC Role / Device Role / Timing Role: Inrush limiter and transient protector for hot-swap power entry stage. Use Value: Limits peak inrush to <1A and blocks 100V transients - meets DO-160 Section 22 surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380IMS-3#TRPBF | Same functionality and pinout; rated for –40°C to 85°C industrial temperature range vs. 0°C to 70°C for LTC4380CMS-3#TRPBF. | Required for extended-temperature industrial or under-hood automotive environments. | Select LTC4380IMS-3#TRPBF when ambient operating temperature exceeds 70°C. |
| LTC4380HMS-3#TRPBF | Same functionality and pinout; rated for –40°C to 125°C high-temperature operation with higher max junction temperature (150°C). | Suitable for engine control units and transmission modules where case temperatures reach 105°C. | Choose LTC4380HMS-3#TRPBF for AEC-Q100 Grade 0/1 automotive applications requiring full under-hood operation. |
Compared with LTC4380CMS-3#TRPBF, the IMS-3 and HMS-3 variants offer identical surge protection architecture and latchoff behavior but extend operational reliability across wider ambient temperature ranges - critical for deployment in harsh-environment control modules where thermal margin dictates component grade selection.
Availability
LTC4380CMS-3#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, reverse battery protection, and industrial hot-swap applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC4380CMS-3#TRPBF 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 automotive and industrial power rail hardening - enabling robust, maintenance-free operation in safety-critical 12V/24V systems.
FAQ
What is the gate clamp configuration of the LTC4380CMS-3#TRPBF?
The LTC4380CMS-3#TRPBF has no internal gate-to-GND clamp - unlike LTC4380-1/-2 variants. Its GATE pin is regulated to VOUT + 11.5V and clamped only to VCC + 13.5V. To set a specific output clamp voltage (e.g., 27V), a Zener diode must be placed between VCC and GND. This design allows flexible, application-specific clamping while maintaining compatibility with the LTC4380CMS-3#TRPBF's latchoff fault behavior.
Does the LTC4380CMS-3#TRPBF support auto-retry after a fault?
No. The LTC4380CMS-3#TRPBF implements latchoff-only fault response. When the TMR pin reaches 1.215V due to overvoltage or overcurrent, the GATE pin turns off and remains off until the ON pin is pulled low for ≥100µs or power is cycled. This differs from LTC4380-2/-4 variants, which feature auto-retry with cool-down timing. The latchoff behavior of LTC4380CMS-3#TRPBF ensures deterministic fault containment in safety-critical systems.
What is the maximum reverse input voltage the LTC4380CMS-3#TRPBF can withstand?
The LTC4380CMS-3#TRPBF withstands –60V on the VCC pin with ON open and SEL = 0V, per Absolute Maximum Ratings. This enables direct connection to automotive battery rails without external reverse-polarity protection diodes. During reverse-battery conditions, the device remains functional and protects downstream circuitry - a key advantage over discrete solutions requiring Schottky diodes with forward voltage drop and thermal limitations.
How is current limiting implemented in the LTC4380CMS-3#TRPBF?
The LTC4380CMS-3#TRPBF limits load current by regulating ΔVSNS (SNS–OUT) to 50mV when OUT > 3V, and to 62mV when OUT < 1.5V. This voltage is sensed across an external current-sense resistor (RSNS), setting ILOAD = 50mV/RSNS. The current limit amplifier operates independently of input voltage and temperature, providing stable, accurate protection across the full 4V–72V operating range - essential for consistent performance in variable automotive battery conditions.
What package type and thermal characteristics does the LTC4380CMS-3#TRPBF use?
The LTC4380CMS-3#TRPBF uses a 10-Lead Plastic MSOP package with an exposed pad connected to GND. Its thermal resistance is θJA = 160°C/W (JEDEC standard board). The exposed pad must be soldered to a thermal pad on the PCB for effective heat dissipation - especially important during sustained overcurrent events where MOSFET power dissipation is transferred through the IC's GATE driver. This package enables compact layout while supporting reliable operation up to 70°C ambient.
LTC4380CMS-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-MSOP
LTC4380CMS-3#TRPBF FAQ
1.How can I place an order for LTC4380CMS-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380CMS-3#TRPBF 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 LTC4380CMS-3#TRPBF reliable?
The price and inventory of LTC4380CMS-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380CMS-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4380CMS-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380CMS-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380CMS-3#TRPBF?
LTC4380CMS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380CMS-3#TRPBF 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 LTC4380CMS-3#TRPBF?
For technical support, including LTC4380CMS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380CMS-3#TRPBF requirements.
6.How does Aetrix verify that LTC4380CMS-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4380CMS-3#TRPBF 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 LTC4380CMS-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4380CMS-3#TRPBF?
All LTC4380CMS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380CMS-3#TRPBF, 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 LTC4380CMS-3#TRPBF part is unused and in its original packaging.
Return procedure for LTC4380CMS-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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