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Analog Devices Inc. LTC4365HDDB#TRMPBF
- Part No.:
- LTC4365HDDB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4365HDDB#TRMPBF.pdf
- Description:
- IC OVERVOLTAGE PROTECT 8-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,691
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Product details
Overview
LTC4365HDDB#TRMPBF from Analog Devices is an automotive-grade N-channel MOSFET controller for overvoltage, undervoltage, and reverse supply protection. It operates from 2.5V to 34V input, withstands –40V to 60V fault transients, delivers up to 9.8V gate enhancement, consumes only 125µA operating current, and features a 36ms recovery delay. It is used in 12V automotive systems to isolate loads from faulty battery connections or surge events.
For engineers reviewing the LTC4365HDDB#TRMPBF datasheet, LTC4365HDDB#TRMPBF pinout, LTC4365HDDB#TRMPBF application, or LTC4365HDDB#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to 125°C), adjustable UV/OV thresholds via external resistive dividers, reverse polarity blocking capability, and compatibility with dual N-channel MOSFETs such as Si9945 or Si4214.
Technical Context
The LTC4365HDDB#TRMPBF integrates two precision comparators (0.5V threshold, 25mV hysteresis) for user-configurable overvoltage and undervoltage detection, each with <1µs propagation delay. Its internal charge pump drives external N-channel MOSFET gates referenced to VOUT, delivering up to 9.8V of gate-to-source enhancement at VIN ≥12V.
It implements three independent protection mechanisms: fast 50mA GATE pull-down on UV/OV faults, automatic GATE-to-VIN connection during reverse VIN (–40V), and gentle shutdown via 90µA GATE pull-down with VOUT tracking. The 36ms recovery timer prevents chatter during noisy input conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 34V - supports nominal 3.3V, 5V, 12V, and 24V systems without level-shifting. |
| Fault Withstand Range | –40V to 60V - blocks reverse battery installation, load dump surges, and AC line coupling. |
| UV/OV Threshold Accuracy | ±1.5% (500mV ±7.5mV) - enables precise 5V–18V window setting with standard 1% resistors. |
| Quiescent Current | 125µA typical - minimizes standby power loss in always-on automotive modules. |
| Recovery Delay | 36ms - filters 50/60Hz ripple and transient noise before re-enabling power path. |
| Temperature Range | –40°C to 125°C - qualified per AEC-Q100 Grade H for under-hood and engine control applications. |
| Package | 8-lead 3mm × 2mm DFN (LFKS marking) - compact footprint with exposed pad for thermal management. |
Pinout & Package
8-lead plastic DFN package (3mm × 2mm, LFKS marking), thermally enhanced with optional exposed pad connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Device Ground Reference | Primary ground return for internal circuitry and charge pump; exposed pad must be connected to PCB ground for thermal and electrical integrity. |
| OV | Overvoltage Comparator Input | Connects to upper resistor of voltage divider; triggers GATE shutdown when VIN exceeds user-set threshold (e.g., 18V). |
| UV | Undervoltage Comparator Input | Connects to lower resistor of voltage divider; disables GATE when VIN drops below user-set threshold (e.g., 5V). |
| VIN | Input Supply Terminal | Accepts protected input from battery, adapter, or alternator; handles –40V to 60V fault conditions. |
| SHDN | Shutdown Control Input | Active-high enable; pulls GATE low and reduces supply current to 10µA when driven <0.4V. |
| FAULT | Open-Drain Fault Indicator | Asserts low during UV/OV fault, SHDN low, or VIN <1.8V; sinks 500µA with VOL ≤0.4V. |
| VOUT | Output Voltage Sense | Senses voltage at load side of external MOSFETs; serves as reference for GATE charge pump. |
| GATE | N-Channel MOSFET Gate Driver | Drives external back-to-back N-MOSFETs; provides up to 9.8V enhancement above VOUT; tracks VIN during reverse faults. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Supply Protection | Automatically connects GATE to negative VIN, turning off M2 body diode conduction - blocks –40V without external diodes or P-MOSFETs. |
| Adjustable UV/OV Window | Two 0.5V comparator inputs with 25mV hysteresis and <10nA leakage - enables precise, stable window setting using high-value resistors (e.g., 2.74MΩ/215kΩ/84.5kΩ). |
| Charge Pump Gate Drive | Delivers up to 9.8V gate enhancement referenced to VOUT - ensures full enhancement of standard logic-level N-MOSFETs (e.g., Si9945, VTH ≤3.0V) across full input range. |
| Gentle Shutdown | 90µA GATE pull-down with VOUT tracking - limits dI/dt during turn-off, suppressing voltage spikes from parasitic inductance in high-current paths. |
| AEC-Q100 Grade H Qualification | Rated for –40°C to 125°C ambient operation with full parametric validation - suitable for engine control units, ADAS sensors, and infotainment power supplies. |
Applications
| Automotive Battery Protection | Industrial Power Input Conditioning |
|---|---|
Use Scenario: Protecting engine control unit (ECU) from reverse battery jump-start, load dump (ISO 7637-2 Pulse 5a), and alternator overvoltage. IC Role / Device Role / Timing Role: Input fault protection controller that isolates downstream 5V/3.3V regulators and microcontrollers from hazardous VIN excursions. Use Value: Eliminates need for TVS diodes and series Schottky diodes; maintains <50mΩ effective RDS(on) path using dual N-MOSFETs like Si9945. | Use Scenario: Securing programmable logic controllers (PLCs) against field wiring errors, induced surges, and brownout in factory automation cabinets. IC Role / Device Role / Timing Role: Supervisory gate driver enforcing strict 24V ±10% input window while providing reverse polarity immunity. Use Value: Enables use of cost-effective N-channel MOSFETs instead of higher-RDS(on) P-channel devices; 36ms debounce prevents nuisance tripping on motor startup transients. |
| Portable Medical Instrumentation | 12V Embedded Computing Platform |
Use Scenario: Safeguarding handheld ultrasound or patient monitor powered by hot-swappable Li-ion packs and AC adapters. IC Role / Device Role / Timing Role: Dual-supply selector and fault blocker ensuring clean 5V rail regardless of source polarity or voltage drift. Use Value: Supports both battery (8–12.6V) and adapter (9–15V) inputs with single IC; <125µA quiescent current extends battery runtime. | Use Scenario: Protecting fanless edge AI compute modules (e.g., NVIDIA Jetson) from automotive 12V rail instability and ESD events. IC Role / Device Role / Timing Role: Primary input supervisor controlling gate of 40V-rated N-MOSFET pair upstream of DC/DC converters. Use Value: Withstands –40V reverse and 60V surge per ISO 16750-2; AEC-Q100 qualification assures reliability in mobile vehicle-mounted deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar input protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS26631PWPR | Integrated 60V eFuse with current limiting (0.5–5A), fixed 3.5V UVLO, no reverse protection; 16-pin HTSSOP package. | Best for overcurrent + overvoltage protection where reverse blocking is handled externally or not required. | Select TPS26631PWPR when precise current limiting and fast short-circuit response (<1µs) are critical, and reverse polarity risk is mitigated elsewhere in design. |
| LTC4366HDDB#TRMPBF | Same package and temp grade; adds integrated 500mA ideal diode function and 1ms recovery (LTC4366-1 variant); requires no external MOSFETs for basic OR-ing. | Preferred for dual-input redundancy (e.g., battery + adapter) where automatic source selection and low forward drop are needed. | Choose LTC4366HDDB#TRMPBF when combining OR-ing and fault protection in one device reduces BOM count and layout area - especially in space-constrained portable designs. |
Compared with TPS26631PWPR, LTC4365HDDB#TRMPBF offers superior reverse polarity blocking and flexible UV/OV window tuning but lacks current limiting. Compared with LTC4366HDDB#TRMPBF, it provides lower gate drive complexity for high-current N-MOSFETs and avoids integrated FET thermal constraints, making it better suited for >5A applications with discrete MOSFET optimization.
Availability
LTC4365HDDB#TRMPBF is available at Aetrix Electronics and suitable for automotive battery protection, industrial PLC input conditioning, and portable medical instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC4365HDDB#TRMPBF 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 LTC4365 product line delivers robust, programmable input protection for harsh environments - designed specifically for automotive and industrial systems needing reliable overvoltage, undervoltage, and reverse polarity immunity without external TVS or diodes.
FAQ
What is the maximum continuous input voltage the LTC4365HDDB#TRMPBF can handle during normal operation?
The LTC4365HDDB#TRMPBF has an operating input voltage range of 2.5V to 34V. While it can withstand fault transients up to –40V and +60V, sustained operation above 34V will exceed its absolute maximum rating and may cause permanent damage. Always ensure steady-state VIN remains within 2.5V–34V for reliable long-term function of the LTC4365HDDB#TRMPBF.
Does the LTC4365HDDB#TRMPBF provide reverse voltage protection without external components?
Yes, the LTC4365HDDB#TRMPBF provides active reverse supply protection down to –40V using its internal reverse VIN comparator and gate control logic. However, external back-to-back N-channel MOSFETs are still required to implement the blocking path - the LTC4365HDDB#TRMPBF drives their gates but does not integrate power switches. No external diodes, TVS, or capacitors are needed for basic reverse protection functionality.
How do I configure overvoltage and undervoltage thresholds for the LTC4365HDDB#TRMPBF?
Configure UV and OV thresholds using external resistive dividers connected to the UV and OV pins. Each input references a precise 0.5V internal threshold; for example, a 5V UV trip uses R1=84.5kΩ, R2=215kΩ, R3=2.74MΩ (per datasheet Figure 4). The LTC4365HDDB#TRMPBF's <10nA input leakage allows high-resistance dividers that minimize quiescent current while maintaining accuracy across temperature.
Is the LTC4365HDDB#TRMPBF pin-compatible with other variants in the LTC4365 family?
Yes, all DFN-packaged LTC4365 variants - including LTC4365CDDB#TRMPBF, LTC4365IDDB#TRMPBF, and LTC4365HDDB#TRMPBF - share identical 8-lead DFN pinouts and footprints. The only differences are temperature grade (C: 0°C–70°C, I: –40°C–85°C, H: –40°C–125°C) and part marking (LFKS for H-grade). No PCB redesign is needed when upgrading to the automotive-grade LTC4365HDDB#TRMPBF.
What external MOSFETs are recommended for use with the LTC4365HDDB#TRMPBF in a 12V automotive system?
For 12V automotive applications, Analog Devices recommends dual N-channel MOSFETs rated for ≥40V VDS and ≤3.0V VTH, such as the Si9945 (60V, 3.0V VTH) or Si4214 (30V, 3.0V VTH). These match the LTC4365HDDB#TRMPBF's 9.8V gate enhancement and –40V reverse tolerance. Layout must include low-inductance GATE traces and proper Kelvin sensing of VOUT to ensure stable regulation and fast fault response in the LTC4365HDDB#TRMPBF circuit.
LTC4365HDDB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Overvoltage, Undervoltage Protection
- Current - Supply:
- 125µA
- Voltage - Supply:
- 2.5V ~ 34V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x2)
LTC4365HDDB#TRMPBF FAQ
1.How can I place an order for LTC4365HDDB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4365HDDB#TRMPBF 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 LTC4365HDDB#TRMPBF reliable?
The price and inventory of LTC4365HDDB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4365HDDB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC4365HDDB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4365HDDB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4365HDDB#TRMPBF?
LTC4365HDDB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4365HDDB#TRMPBF 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 LTC4365HDDB#TRMPBF?
For technical support, including LTC4365HDDB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4365HDDB#TRMPBF requirements.
6.How does Aetrix verify that LTC4365HDDB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC4365HDDB#TRMPBF 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 LTC4365HDDB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC4365HDDB#TRMPBF?
All LTC4365HDDB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4365HDDB#TRMPBF, 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 LTC4365HDDB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC4365HDDB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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