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Analog Devices Inc. LTC4380HMS-4#WTRPBF
- Part No.:
- LTC4380HMS-4#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4380HMS-4#WTRPBF.pdf
- Description:
- L Q C SURGE STOPPER
- Quantity:
- Payment:
- Shipping:
Inventory:4,146
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Product details
Overview
LTC4380HMS-4#WTRPBF from Analog Devices is a low-quiescent-current (11 µA typ) automotive-grade surge stopper IC that controls an external N-channel MOSFET to protect downstream loads from overvoltage (e.g., 250 Vpk load dump) and overcurrent events. It features adjustable gate clamp voltage, reverse input protection to –60 V, and auto-retry fault behavior in a 10-lead MSOP package rated for –40°C to 125°C operation.
For engineers reviewing the LTC4380HMS-4#WTRPBF datasheet, LTC4380HMS-4#WTRPBF pinout, LTC4380HMS-4#WTRPBF application, or LTC4380HMS-4#WTRPBF equivalent, key selection criteria include its 4 V to 72 V input range, 50 mV current limit threshold, TMR-based MOSFET stress acceleration, latchoff vs. auto-retry behavior, and AEC-Q100 qualification for automotive systems.
Technical Context
The LTC4380HMS-4#WTRPBF implements a multiplier-based fault timer where TMR pin current scales with both VDS (via DRN pin) and ID (via SNS–OUT differential), enabling dynamic SOA protection proportional to MOSFET power dissipation. Its internal 20 µA charge pump regulates GATE to VOUT + 11.5 V, and gate clamping is fully external-no internal clamp to GND-requiring Zener diode control at VCC for output voltage limiting.
It supports auto-retry fault recovery via TMR cool-down cycling (15 cycles between 1.215 V and 3.4 V), with FLT open-drain output asserting low during faults. The ON pin serves dual roles: undervoltage detection (1.05 V threshold) and shutdown control, reducing quiescent current to 6 µA in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4 V to 72 V input - supports 12 V, 24 V, and 28 V automotive systems with headroom for transients up to 250 Vpk. |
| Quiescent Current | 11 µA typical - enables always-on battery-powered applications without excessive drain. |
| Current Limit Threshold | 50 mV (SNS–OUT), rising to 62 mV when OUT < 1.5 V - sets precise, temperature-stable load current limit via external sense resistor. |
| Fault Timer Reference | TMR pin trip threshold = 1.215 V - integrates scaled MOSFET stress current to enforce safe turn-off before SOA violation. |
| Temperature Range | –40°C to +125°C - qualified per AEC-Q100 Grade H for under-hood automotive use. |
| Package | 10-lead MSOP - surface-mount, thermally enhanced footprint compatible with industrial reflow profiles. |
| Reverse Input Protection | Withstands –60 V on VCC - eliminates need for external reverse-polarity diode in battery-connected systems. |
Pinout & Package
Package: 10-lead plastic MSOP (3 mm × 3 mm footprint, 0.5 mm pitch), exposed pad optional for thermal enhancement. Rated θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device ground reference | Common return for all internal circuitry; exposed pad may be connected to PCB ground plane for improved thermal performance. |
| VCC | Positive supply input | Accepts 4 V to 72 V; withstands –60 V reverse; requires external Zener clamp for >80 V transients. |
| OUT | Output voltage sense | Senses load-side voltage; internal clamp limits GATE–OUT to 17 V; bypass with ≥22 µF ceramic capacitor. |
| SNS | Current sense input | Monitors voltage drop across external sense resistor; ΔVSNS regulated to 50 mV (62 mV in severe short). |
| DRN | MOSFET drain-source sense | Current proportional to VDS; used with RDRN to feed multiplier for MOSFET stress-dependent fault timing. |
| GATE | N-MOSFET gate drive | Regulated to VOUT + 11.5 V; no internal clamp to GND - output voltage limited only by external VCC Zener. |
| ON | Enable/UV/shutdown control | 1.05 V threshold; pulls part into 6 µA shutdown when below threshold; internal 1 MΩ pull-up enables default-on operation. |
| SEL | Gate clamp configuration | Connected to GND for LTC4380-4; unused in adjustable versions - no internal clamp selection applied. |
| TMR | Fault timer integrator | Capacitor-to-ground sets fault timeout and cool-down period; current scales with MOSFET power dissipation. |
| FLT | Open-drain fault indicator | Pulls low during overvoltage or overcurrent fault; sinks up to 3 mA; high-Z otherwise. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-retry fault recovery | Enables automatic restart after cool-down cycling (15 TMR cycles), minimizing system downtime during transient surges. |
| External gate clamp architecture | Removes fixed internal clamp - allows precise output voltage setting (e.g., 27 V, 45 V) via VCC Zener, supporting any system up to 72 V. |
| MOSFET stress-accelerated timing | TMR current increases with both VDS and ID, shortening fault timeout under high-power stress to keep MOSFET within SOA. |
| AEC-Q100 Grade H qualification | Validated for –40°C to +125°C operation with full automotive reliability testing - suitable for engine control, ADAS, and body electronics. |
| Reverse input tolerance | Withstands –60 V on VCC without damage - eliminates Schottky diode or ideal diode controller in reverse-battery protection schemes. |
Applications
| Automotive Load Dump Protection | Industrial Battery-Powered Systems |
|---|---|
Use Scenario: 12 V vehicle electrical system subjected to ISO 7637-2 Pulse 5a (250 Vpk, 100 ms) load dump transient. IC Role / Device Role / Timing Role: Surge stopper controlling external N-MOSFET to clamp output at 27 V and limit MOSFET stress via TMR-based adaptive timing. Use Value: Prevents downstream ECU damage while maintaining system uptime through auto-retry behavior after transient clearance. |
Use Scenario: Always-on remote sensor node powered by 12 V lead-acid battery with risk of reverse polarity connection. IC Role / Device Role / Timing Role: High-side switch with reverse-input protection and ultra-low 11 µA operating current. Use Value: Eliminates need for series Schottky diode, reducing voltage drop and heat generation while extending battery life. |
| Hot-Swap Power Distribution | Avionic Power Conditioning |
Use Scenario: Live insertion of a payload module into a 28 V aircraft bus with potential for inrush and short-circuit faults. IC Role / Device Role / Timing Role: Current-limited, soft-starting high-side switch with 50 mV programmable current limit and fast 2 µs overcurrent turn-off. Use Value: Prevents bus voltage sag and protects upstream power source during plug-in events without manual reset. |
Use Scenario: Critical avionics subsystem requiring uninterrupted 24 V supply despite input transients up to 100 V. IC Role / Device Role / Timing Role: Adjustable-clamp surge stopper with external Zener-defined 45 V output limit and AEC-Q100-compliant reliability. Use Value: Meets DO-160 Section 22 surge immunity requirements while providing deterministic fault response and restart behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4380HMS-2#WTRPBF | Fixed internal 31.5 V / 50 V gate clamp; auto-retry fault behavior identical. | Predefined clamp voltages simplify design for standard 12 V / 24 V systems but lack flexibility for custom output limits. | Select when output clamping at 27 V or 45 V is sufficient and external Zener control is undesirable. |
| TPS26631RTVR | Integrated 60 V MOSFET; fixed 2.5 A current limit; no VDS-based stress acceleration; 25 µA IQ. | Lower BOM count but limited to ≤60 V and fixed current limit; lacks TMR-based adaptive timing for MOSFET SOA. | Select for space-constrained designs where integrated FET suffices and adaptive stress timing is not required. |
Compared with LTC4380HMS-2#WTRPBF, the LTC4380HMS-4#WTRPBF trades internal clamp simplicity for full external voltage control - critical when precise, non-standard output clamping (e.g., 33 V, 39 V) or compatibility with legacy Zener networks is needed. Versus TPS26631RTVR, it offers superior MOSFET SOA management and lower quiescent current but requires external FET selection and layout.
Availability
LTC4380HMS-4#WTRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial battery backup systems, hot-swap power distribution, and avionic power conditioning requiring stable component supply across extended temperature and reliability requirements.
Supply support for LTC4380HMS-4#WTRPBF 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, communications, and automotive markets.
The LTC4380 product line delivers robust, low-IQ surge protection ICs designed specifically for automotive and harsh-environment power systems where reliability, wide input range, and adaptive fault handling are mandatory.
FAQ
What is the gate clamp architecture of the LTC4380HMS-4#WTRPBF?
The LTC4380HMS-4#WTRPBF has no internal gate-to-GND clamp - it is an adjustable version (LTC4380-4) relying entirely on external Zener clamping at the VCC pin to define output voltage limit. This enables precise, system-specific clamping (e.g., 27 V, 39 V, 45 V) without internal voltage steps, unlike the fixed 31.5 V/50 V variants. The GATE pin is regulated to VOUT + 11.5 V and clamped to VCC + 13.5 V.
How does the fault timer in the LTC4380HMS-4#WTRPBF respond to MOSFET stress?
The LTC4380HMS-4#WTRPBF uses a multiplier circuit that generates TMR pin current proportional to both VDS (via DRN pin) and ID (via SNS–OUT). Higher MOSFET power dissipation increases TMR charging rate, shortening fault timeout - ensuring faster turn-off under severe stress and keeping the external MOSFET within its safe operating area.
What is the purpose of the SEL pin on the LTC4380HMS-4#WTRPBF?
On the LTC4380HMS-4#WTRPBF, the SEL pin is not functional - it must be connected to GND per datasheet guidance for LTC4380-3/LTC4380-4 variants. Unlike LTC4380-1/-2, this part has no internal gate clamp selection logic; the SEL pin serves only as a no-connect placeholder in the pinout.
Can the LTC4380HMS-4#WTRPBF be used in reverse-battery protection circuits?
Yes. The LTC4380HMS-4#WTRPBF withstands –60 V on the VCC pin with no damage and draws only 6 µA in shutdown (ON pin low), making it suitable for reverse-polarity protection in 12 V/24 V battery systems. It eliminates the forward voltage drop and heat of a Schottky diode while enabling bidirectional blocking when paired with back-to-back MOSFETs driven by GATE.
What is the recommended CTMR capacitor for the LTC4380HMS-4#WTRPBF?
A 10 V or higher rated X7R ceramic capacitor is recommended for CTMR on the LTC4380HMS-4#WTRPBF to minimize voltage and temperature coefficient effects. Typical values range from 100 nF to 10 µF depending on required fault timeout; for example, 8.2 µF yields ~100 ms overvoltage hold time in a 12 V/1 A application with FDB33N25 MOSFET.
LTC4380HMS-4#WTRPBF 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:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LTC4380HMS-4#WTRPBF FAQ
1.How can I place an order for LTC4380HMS-4#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4380HMS-4#WTRPBF 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 LTC4380HMS-4#WTRPBF reliable?
The price and inventory of LTC4380HMS-4#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4380HMS-4#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC4380HMS-4#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4380HMS-4#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4380HMS-4#WTRPBF?
LTC4380HMS-4#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4380HMS-4#WTRPBF 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 LTC4380HMS-4#WTRPBF?
For technical support, including LTC4380HMS-4#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4380HMS-4#WTRPBF requirements.
6.How does Aetrix verify that LTC4380HMS-4#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4380HMS-4#WTRPBF 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 LTC4380HMS-4#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC4380HMS-4#WTRPBF?
All LTC4380HMS-4#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4380HMS-4#WTRPBF, 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 LTC4380HMS-4#WTRPBF part is unused and in its original packaging.
Return procedure for LTC4380HMS-4#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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