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Analog Devices Inc. LTC4380IMS-1#TRPBF
- Part No.:
- LTC4380IMS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4380IMS-1#TRPBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC4380IMS-1#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 battery, and overcurrent events. It features 8µA operating current, fixed 31.5V/50V selectable gate clamp, –40°C to +85°C industrial temperature range, and MSOP-10 package. It is used in 12V/24V automotive power rails where sustained overvoltage must be clamped to ~27V or ~45V.
For engineers reviewing the LTC4380IMS-1#TRPBF datasheet, LTC4380IMS-1#TRPBF pinout, LTC4380IMS-1#TRPBF application, or LTC4380IMS-1#TRPBF equivalent, key selection criteria include gate clamp voltage selectability (SEL pin), latchoff fault behavior, reverse input protection to –60V, adjustable turn-on threshold (1.05V ON pin), and MOSFET stress-accelerated fault timing via TMR pin current proportional to VDS × ID.
Technical Context
The LTC4380IMS-1#TRPBF implements a multiplier-based fault timer where TMR pin current scales with both MOSFET drain-source voltage (monitored at DRN) and load current (sensed via ΔVSNS), enabling dynamic SOA protection. Its internal 20µA charge pump regulates GATE to VOUT + 11.5V during normal operation, while internal Zener clamps limit GATE to 31.5V (SEL = GND) or 50V (SEL = VCC) for overvoltage limiting.
It uses an accurate 1.05V ON pin comparator for undervoltage lockout and shutdown control, reducing quiescent current to 6µA. Fault response differs by variant: LTC4380-1 (including IMS-1) latches off upon TMR threshold (1.215V) and requires ON pin reset or power cycle - no auto-retry - making it suitable for safety-critical systems requiring manual intervention after fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Current | 8 µA typical - enables always-on battery-powered applications without significant standby drain. |
| Input Voltage Range | 4 V to 80 V - supports 12V/24V/28V automotive systems and accommodates transients up to 80V on VCC. |
| Gate Clamp Options | 31.5 V (SEL = GND) or 50 V (SEL = VCC) - sets output clamp at ~27 V or ~45 V respectively, matching 12V and 24V system requirements. |
| Reverse Input Protection | –60 V - withstands reverse battery connection without damage, eliminating need for external series diode. |
| Fault Behavior | Latchoff (LTC4380-1 variant) - disables output permanently until ON pin is pulsed low ≥100 µs or power is cycled. |
| Current Limit Threshold | 50 mV (rising), 62 mV (severe short, OUT < 1.5 V) - defines precise load current limit via external sense resistor (e.g., 20 mΩ → 2.5 A nominal). |
| Package | 10-Lead MSOP - surface-mount, thermally enhanced, footprint compatible with industry-standard layout practices. |
Pinout & Package
Package: 10-Lead Plastic MSOP (3mm × 3mm body, 0.5mm pitch), exposed pad optional for thermal relief. Operating ambient temperature range: –40°C to +85°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRN | MOSFET VDS sense input | Tracks OUT; current through RDRN is proportional to VDS, feeding multiplier for MOSFET stress-dependent fault timing. |
| VCC | Positive supply input | Accepts 4V–80V input; survives –60V reverse bias; powers internal circuitry and charge pump. |
| GATE | N-MOSFET gate driver output | Regulated to VOUT + 11.5V; clamped to 31.5V/50V (SEL-dependent); includes 17V internal clamp vs. OUT to prevent MOSFET overdrive. |
| SNS | Current sense amplifier input | Senses voltage across external sense resistor; controls GATE to maintain ΔVSNS = 50 mV (or 62 mV under severe short). |
| OUT | Output voltage sense reference | Connects to MOSFET source; referenced by SNS, GATE, and internal clamps; requires ≥22 µF local bypass. |
| ON | Enable/shutdown & UVLO input | 1.05 V threshold; open-drain-compatible; pulls part into 6 µA shutdown when < 0.99 V. |
| FLT | Open-drain fault indicator | Pulls low when TMR reaches 1.215 V; sinks up to 3 mA; signals latchoff condition requiring manual reset. |
| SEL | Gate clamp voltage select | GND = 31.5 V clamp; VCC/OUT = 50 V clamp - configures output overvoltage limit for 12V or 24V/28V systems. |
| TMR | Fault timer integrator node | Capacitor-connected node; current scales with MOSFET power dissipation; charges to 1.215 V to trigger latchoff. |
| GND | Device ground reference | Return path for all internal circuits; exposed pad may be connected to PCB ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low operating quiescent current | 8 µA enables direct connection to vehicle battery for always-on ECU modules without excessive parasitic drain. |
| Selectable fixed gate clamp | 31.5 V / 50 V options via SEL pin eliminate need for external Zener or feedback network in standard 12V/24V designs. |
| Latchoff fault response | Prevents automatic re-engagement after overvoltage or overcurrent, supporting fail-safe system architecture requiring operator or host MCU intervention. |
| Reverse input tolerance | –60 V rating allows direct connection to battery terminals without series Schottky diode, reducing BOM count and forward drop loss. |
| MOSFET stress-accelerated timing | TMR current increases with VDS × ID, shortening fault timeout during high-power-dissipation events to keep MOSFET within SOA limits. |
Applications
| Automotive Load Dump Protection | Industrial Power Rail Protection |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS sensors from 12V vehicle battery surges up to 250V during alternator load dump. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET as high-side switch; clamps output to 27V using 31.5V gate clamp (SEL = GND). Use Value: Prevents damage to downstream 28V-rated DC-DC converters and microcontrollers without requiring oversized input capacitors or TVS diodes. | Use Scenario: Securing programmable logic controllers (PLCs) powered from unregulated 24V industrial supplies subject to long-duration transients. IC Role / Device Role / Timing Role: Overvoltage and overcurrent protector with latchoff behavior; monitors MOSFET VDS and ID to enforce safe SOA during sustained overload. Use Value: Eliminates risk of thermal runaway in pass MOSFET during extended overcurrent, ensuring system integrity until maintenance reset. |
| Reverse Battery Protection | Always-On Telematics Module |
Use Scenario: Safeguarding fleet telematics modules against accidental –12V reverse battery connection during service. IC Role / Device Role / Timing Role: Reverse input tolerant controller; blocks reverse current flow while maintaining forward conduction path via back-to-back MOSFET drive capability. Use Value: Replaces discrete Schottky diode solution, removing 0.3–0.5V forward drop and associated heat generation in compact enclosures. | Use Scenario: Enabling GPS tracking and CAN bus wake-up functionality in parked vehicles with minimal battery drain. IC Role / Device Role / Timing Role: Low-IQ (8 µA) enable controller with accurate 1.05V ON-pin UVLO; enters 6 µA shutdown when battery drops below 11.5V. Use Value: Extends usable battery life from weeks to months in sleep mode, meeting OEM requirements for >1-year parking endurance. |
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#TRPBF | Same pinout and gate clamp options, but auto-retry (cool-down + restart) instead of latchoff fault behavior. | Suitable for non-safety-critical systems where automatic recovery after transient fault is acceptable. | Choose for applications requiring autonomous recovery without host MCU intervention after brief overvoltage events. |
| TPS26631PWPR | Integrated 60V eFuse with 1.5A current limit; no external MOSFET required; fixed 1.2ms overcurrent response; no VDS-based stress acceleration. | Lower component count for ≤1.5A loads; lacks adjustable gate clamp and reverse input tolerance beyond –20V. | Choose for space-constrained 24V industrial modules needing simple, integrated overcurrent protection without MOSFET-level SOA management. |
Compared with LTC4380IMS-2#TRPBF, the LTC4380IMS-1#TRPBF provides deterministic fault containment via latchoff, critical for functional safety compliance; compared with TPS26631PWPR, it offers superior reverse voltage handling (–60V vs –20V), external MOSFET scalability, and adaptive fault timing tied directly to MOSFET power dissipation.
Availability
LTC4380IMS-1#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial power rail hardening, and always-on telematics modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4380IMS-1#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, Inc. 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 robust, low-IQ surge protection for high-reliability power systems, specifically engineered for automotive and industrial environments where load dump, reverse battery, and sustained overcurrent must be managed with predictable, field-proven behavior.
FAQ
What is the function of the SEL pin on the LTC4380IMS-1#TRPBF?
The SEL pin on the LTC4380IMS-1#TRPBF selects the internal gate clamp voltage: grounding SEL sets a 31.5V clamp (for ~27V output in 12V systems), while connecting SEL to VCC or OUT selects a 50V clamp (for ~45V output in 24V/28V systems). This configuration determines the maximum output voltage during overvoltage events and is a defining feature of the LTC4380IMS-1#TRPBF variant.
Does the LTC4380IMS-1#TRPBF support reverse battery protection?
Yes, the LTC4380IMS-1#TRPBF supports reverse input protection down to –60V on the VCC pin without damage. It enables reverse-battery-tolerant designs by allowing back-to-back N-MOSFET configurations - eliminating the forward voltage drop and heat generation of Schottky diodes - a key capability confirmed in the Absolute Maximum Ratings and Applications sections of the LTC4380IMS-1#TRPBF datasheet.
How does fault handling differ between LTC4380IMS-1#TRPBF and LTC4380IMS-2#TRPBF?
The LTC4380IMS-1#TRPBF implements latchoff behavior: upon reaching the TMR fault threshold (1.215V), it shuts off the external MOSFET and holds it off indefinitely until the ON pin is pulled low for ≥100µs or power is cycled. In contrast, LTC4380IMS-2#TRPBF performs auto-retry with cool-down timing. This latchoff behavior is intrinsic to the LTC4380IMS-1#TRPBF and ensures no unintended re-engagement after fault conditions.
What is the minimum recommended output capacitance for the LTC4380IMS-1#TRPBF?
The LTC4380IMS-1#TRPBF requires a minimum of 22µF ceramic or low-ESR capacitor placed as close as possible to the OUT pin, per the "OUT" pin function description. This capacitance stabilizes the output voltage sense node, prevents oscillation in the current limit loop, and ensures reliable startup and transient response - a requirement explicitly stated for the LTC4380IMS-1#TRPBF in the Pin Functions section of its datasheet.
Can the LTC4380IMS-1#TRPBF drive back-to-back N-channel MOSFETs?
Yes, the LTC4380IMS-1#TRPBF can drive back-to-back N-channel MOSFETs for reverse input protection, as confirmed in the Features and Pin Functions sections. Its GATE driver supports this topology by providing sufficient gate voltage headroom (VOUT + 11.5V regulation) and internal clamping to prevent shoot-through, eliminating the need for a series Schottky diode and its associated voltage drop and power loss - a verified capability of the LTC4380IMS-1#TRPBF.
LTC4380IMS-1#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
LTC4380IMS-1#TRPBF FAQ
1.How can I place an order for LTC4380IMS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380IMS-1#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 LTC4380IMS-1#TRPBF reliable?
The price and inventory of LTC4380IMS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380IMS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4380IMS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380IMS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380IMS-1#TRPBF?
LTC4380IMS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380IMS-1#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 LTC4380IMS-1#TRPBF?
For technical support, including LTC4380IMS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380IMS-1#TRPBF requirements.
6.How does Aetrix verify that LTC4380IMS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4380IMS-1#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 LTC4380IMS-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4380IMS-1#TRPBF?
All LTC4380IMS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380IMS-1#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 LTC4380IMS-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC4380IMS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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