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Analog Devices Inc. LTC4380IMS-3#PBF
- Part No.:
- LTC4380IMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4380IMS-3#PBF.pdf
- Description:
- IC LOW CUR SURGE STOPPER 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LTC4380IMS-3#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 adjustable gate clamp voltage, 8µA operating current, –40°C to 85°C industrial temperature range, and MSOP-10 package. Used in battery-powered telematics and ADAS power rails where latchoff behavior and reverse input protection to –60V are required.
For engineers reviewing the LTC4380IMS-3#PBF datasheet, LTC4380IMS-3#PBF pinout, LTC4380IMS-3#PBF application, or LTC4380IMS-3#PBF equivalent, key selection criteria include its latchoff fault response (vs. auto-retry), absence of internal gate-to-GND clamp (requiring external Zener at VCC), 50mV/62mV current limit threshold, and compatibility with high-voltage N-channel MOSFETs for high-side switching in 12V/24V/48V systems.
Technical Context
The LTC4380IMS-3#PBF implements a multiplier-based fault timer that generates TMR pin current proportional to both MOSFET VDS (via DRN pin) and ID (via SNS–OUT differential), enabling dynamic SOA protection. Its GATE driver regulates to VOUT + 11.5V and lacks internal gate-to-GND clamping - unlike -1/-2 variants - requiring external VCC Zener clamping to set output voltage limit.
It uses an ON pin comparator with 1.05V turn-on threshold and 45mV hysteresis for undervoltage detection and shutdown control, reducing quiescent current to 6µA. The FLT open-drain output asserts low during fault conditions and remains latched until ON is pulsed low ≥100µs or power is cycled - confirming its LTC4380-3 variant identity per Table 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 72V input; supports 12V, 24V, and 48V automotive/industrial rails without external level shifting. |
| Quiescent Current | 8µA typical at 12V; enables always-on operation in battery-backed systems with multi-year runtime. |
| Current Limit Threshold | 50mV (rising), 62mV (severe short, OUT < 1.5V); sets precise ILOAD = ΔVSNS/RSNS with minimal sense resistor power loss. |
| Fault Response | Latchoff (non-auto-retry); requires ON pin pulse or power cycle to recover - prevents uncontrolled cycling during persistent faults. |
| Reverse Input Protection | Withstands –60V on VCC; eliminates need for series Schottky diode and its associated 0.3V drop and thermal dissipation. |
| Package & Temp Grade | 10-pin MSOP, –40°C to +85°C; qualified for industrial and extended-temperature embedded applications. |
| GATE Clamp Architecture | No internal gate-to-GND clamp; relies on external Zener at VCC to define GATE clamp voltage (e.g., 68V Zener → ~63V output clamp). |
Pinout & Package
10-Lead Plastic MSOP (MS package), exposed pad optional for thermal relief. Pin 1 = DRN, Pin 10 = SEL; GND (Pin 3) and exposed pad are internally connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRN | MOSFET drain-source sense input | Tracks OUT; develops current ∝ VDS through RDRN to feed multiplier for MOSFET stress-aware timing. |
| VCC | Main supply input | Accepts 4V–72V; must be externally clamped (e.g., 68V Zener) to set GATE clamp voltage since no internal clamp exists. |
| GATE | N-MOSFET gate drive output | Regulated to VOUT + 11.5V; limited to VCC + 13.5V; requires ≥47nF capacitor + 33Ω series resistor for stability. |
| SNS | Current sense amplifier input (+) | Monitors voltage across external sense resistor; controls GATE to hold ΔVSNS = 50mV/62mV for overcurrent limiting. |
| OUT | Output voltage sense input (–) | Reference node for SNS and GATE regulation; bypass with ≥22µF ceramic capacitor adjacent to pin. |
| ON | Enable/shutdown & UVLO input | Turns device on at ≥1.05V; pulls into shutdown (<0.99V) to reduce IQ to 6µA; tolerates –60V to +80V. |
| FLT | Open-drain fault indicator | Pulls low during overvoltage/overcurrent fault; remains latched low until ON pin is pulsed or power cycled. |
| SEL | Gate clamp select (NC for -3) | No function in LTC4380IMS-3#PBF; must be tied to GND per datasheet guidance for -3/-4 variants. |
| TMR | Fault timer integration node | Capacitor-connected node; charges with MOSFET-power-proportional current; trips at 1.215V to disable GATE. |
| GND | Device ground reference | Return path for all internal circuits; exposed pad may be connected to PCB ground plane for thermal improvement. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Clamping | Enables precise output voltage limit (e.g., 27V, 45V, or 63V) via external Zener on VCC - no fixed internal clamp restricts design flexibility. |
| Latchoff Fault Behavior | Prevents uncontrolled restart attempts during sustained overvoltage (e.g., load dump) or short-circuit conditions - critical for system safety compliance. |
| Reverse Input Tolerance | Supports –60V on VCC without damage, allowing direct connection to battery terminals in reverse-battery scenarios without added protection diodes. |
| Ultra-Low Quiescent Current | 8µA operating current enables use in always-on vehicle modules (e.g., CAN wake-up receivers) without compromising battery life. |
| MOSFET Stress-Aware Timing | Internal multiplier scales TMR charging current with both VDS and ID, shortening fault timeout under high-power-dissipation conditions to keep MOSFET within SOA. |
Applications
| Automotive Load Dump Protection | Industrial Battery Backup Systems |
|---|---|
Use Scenario: Protecting infotainment head units and ADAS ECUs from 12V vehicle battery transients up to 250V peak during alternator load dump. IC Role / Device Role / Timing Role: High-side surge stopper controlling external N-MOSFET; clamps output to safe level (e.g., 27V) while latching off during sustained overvoltage. Use Value: Eliminates need for TVS diodes rated for >200W peak power; reduces BOM cost and board area vs. discrete clamp solutions. |
Use Scenario: Maintaining clean 12V/24V power to PLC I/O modules during AC mains failure, using supercapacitor or LiFePO4 backup. IC Role / Device Role / Timing Role: Always-on high-side switch with ultra-low IQ; provides reverse polarity protection and graceful shutdown during brownout. Use Value: Extends backup runtime by minimizing standby current; withstands –60V reverse battery connection during field maintenance. |
| Telematics Power Sequencing | Rail Isolation in Multi-Supply Systems |
Use Scenario: Enabling controlled power-up of LTE modem, GNSS receiver, and CAN transceiver in vehicle telematics units after ignition-on. IC Role / Device Role / Timing Role: Programmable enable switch with UVLO monitoring; delays GATE turn-on until VIN exceeds 1.05V with 45mV hysteresis. Use Value: Prevents erratic modem initialization during cranking; ensures reliable GPS lock and cellular registration before firmware boot. |
Use Scenario: Isolating sensitive analog sensor rails (e.g., current shunt monitors) from noisy digital power domains in motor drives. IC Role / Device Role / Timing Role: Low-noise, low-leakage high-side switch; blocks cross-rail coupling while supporting fast transient response. Use Value: Reduces measurement error from supply noise injection; maintains <1µA leakage even at 72V input, preserving signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380IMS-1#PBF | Includes internal 31.5V/50V gate-to-GND clamp selectable via SEL pin; same latchoff behavior. | Fixed clamp simplifies design for standard 12V/24V systems but lacks flexibility for custom clamp voltages. | Select when output clamp voltage is fixed at 27V or 45V and external Zener clamping is undesirable. |
| LTC4380IMS-4#PBF | Same adjustable gate clamp architecture as -3, but implements auto-retry (cool-down) instead of latchoff fault response. | Auto-retry may cause repeated stress on MOSFET during persistent faults; unsuitable for safety-critical latched-shutdown requirements. | Select only if automatic recovery after transient overvoltage is required and system-level fault handling permits retry behavior. |
Compared with LTC4380IMS-1#PBF, the LTC4380IMS-3#PBF trades internal clamp simplicity for full external clamp voltage programmability; compared with LTC4380IMS-4#PBF, it replaces auto-retry with deterministic latchoff - making it preferred for fail-safe industrial and automotive subsystems where unattended restart is prohibited.
Availability
LTC4380IMS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial battery backup systems, and telematics power sequencing requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LTC4380IMS-3#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 industrial, automotive, communications, and healthcare markets.
The LTC4380 product line delivers robust, low-IQ surge protection ICs designed specifically for high-reliability power rail hardening in automotive and industrial environments where load dump, reverse battery, and overcurrent events are common.
FAQ
What is the key functional difference between LTC4380IMS-3#PBF and LTC4380IMS-1#PBF?
The LTC4380IMS-3#PBF has no internal gate-to-GND clamp voltage and requires external Zener clamping at the VCC pin to set output voltage limits, whereas the LTC4380IMS-1#PBF integrates selectable 31.5V/50V clamps. Both share latchoff fault behavior, but the -3 variant offers full programmability for non-standard clamp voltages like 36V or 63V in specialized 48V systems.
How does the LTC4380IMS-3#PBF achieve reverse input protection to –60V?
The LTC4380IMS-3#PBF achieves –60V reverse input tolerance through ruggedized internal ESD structures and rail-to-rail input stage design on the VCC pin. No external components are needed - the device safely sinks reverse current without latch-up or damage, eliminating Schottky diodes and their associated forward voltage drop and thermal burden in battery-connected applications.
What external components are mandatory for stable operation of the LTC4380IMS-3#PBF?
Mandatory external components for the LTC4380IMS-3#PBF include: (1) ≥22µF ceramic capacitor at OUT, (2) ≥47nF capacitor + 33Ω series resistor at GATE, (3) current sense resistor (RSNS) sized for 50mV drop at max load, (4) RDRN scaled to limit DRN current to ≤1mA at max input, and (5) Zener diode from VCC to GND to define gate clamp voltage - e.g., 68V Zener for ~63V output clamp.
Why does the LTC4380IMS-3#PBF use a multiplier-based fault timer instead of fixed delay?
The LTC4380IMS-3#PBF uses a multiplier-based fault timer to dynamically scale TMR charging current with both MOSFET VDS and ID, ensuring shorter fault timeouts under high-power-dissipation conditions. This keeps the external MOSFET within its Safe Operating Area during severe faults like output shorts, unlike fixed-timer approaches that risk thermal runaway.
Can the LTC4380IMS-3#PBF be used in AEC-Q100-compliant automotive designs?
Yes - the LTC4380IMS-3#PBF is specified for –40°C to +85°C operation and is part of Analog Devices' automotive-qualified portfolio. While the base part number itself is not marked "AEC-Q100", its I-grade temperature range, latchoff behavior, reverse battery tolerance, and qualification data align with AEC-Q100 stress test requirements for transients and reliability in automotive power systems.
LTC4380IMS-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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-MSOP
LTC4380IMS-3#PBF FAQ
1.How can I place an order for LTC4380IMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380IMS-3#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 LTC4380IMS-3#PBF reliable?
The price and inventory of LTC4380IMS-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380IMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LTC4380IMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380IMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380IMS-3#PBF?
LTC4380IMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380IMS-3#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 LTC4380IMS-3#PBF?
For technical support, including LTC4380IMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380IMS-3#PBF requirements.
6.How does Aetrix verify that LTC4380IMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4380IMS-3#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 LTC4380IMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LTC4380IMS-3#PBF?
All LTC4380IMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380IMS-3#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 LTC4380IMS-3#PBF part is unused and in its original packaging.
Return procedure for LTC4380IMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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