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Analog Devices Inc. LTC4367HDD#PBF
- Part No.:
- LTC4367HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4367HDD#PBF.pdf
- Description:
- SUPPLY PROTECTION CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:3,273
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Product details
Overview
LTC4367HDD#PBF from Analog Devices is a high-voltage overvoltage, undervoltage, and reverse supply protection controller that manages back-to-back N-channel MOSFETs to safeguard downstream loads. It operates from 2.5V to 60V, withstands –40V to 100V fault transients, features adjustable UV/OV thresholds (500mV comparator reference), delivers up to 13.1V gate drive enhancement, and provides 32ms fault recovery delay - ideal for automotive load-dump protection in 24V systems.
For engineers reviewing the LTC4367HDD#PBF datasheet, LTC4367HDD#PBF pinout, LTC4367HDD#PBF application, or LTC4367HDD#PBF equivalent, key selection considerations include its –40°C to 125°C operating temperature range, DFN-8 (3mm × 3mm) package, 70µA operating current, 5µA shutdown current, and compatibility with dual N-channel MOSFETs such as Si7942 for robust 100V surge handling.
Technical Context
The LTC4367HDD#PBF integrates dual precision comparators (UV/OV) with 25mV hysteresis and 1µs propagation delay, a high-voltage charge pump referenced to VOUT, and reverse-voltage detection logic that actively clamps GATE to VIN during negative input events. Its gate drive architecture supports fast turn-off (60mA sink) and controlled slow turn-off (90µA sink) via SHDN, enabling low-noise power sequencing.
It implements a 32ms GATE turn-on delay timer after fault clearance to suppress line noise and prevent chattering, while maintaining independent UV/OV threshold setting via external resistive dividers. The device's –40V to 100V absolute maximum VIN rating and 5µA shutdown current are validated across its full –40°C to 125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 2.5V to 60V - defines functional input supply window for normal operation |
| Protection Range | –40V to 100V - specifies absolute fault voltage limits the IC survives without damage |
| UV/OV Threshold Reference | 500mV ±7.5mV - precise internal comparator reference enabling accurate external resistor-based trip points |
| Gate Drive Enhancement | Up to 13.1V above VOUT - ensures full enhancement of N-channel MOSFETs even at low VOUT |
| Operating Current | 70µA typical - enables always-on protection in battery-backed or low-power industrial systems |
| Shutdown Current | 5µA maximum - supports ultra-low quiescent power states during system sleep modes |
| Temperature Range | –40°C to 125°C - qualified for under-hood automotive and harsh industrial environments |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (pin 9), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input supply terminal | Accepts –40V to 100V; powers internal circuitry and serves as fault monitoring node |
| UV | Undervoltage comparator input | Connects to resistive divider; triggers fault when voltage falls below 0.5V reference |
| OV | Overvoltage comparator input | Connects to resistive divider; triggers fault when voltage rises above 0.5V reference |
| GND | Device ground reference | Primary return path for internal regulators and comparator references |
| GATE | Gate drive output | Drives external N-MOSFET gates; referenced to VOUT; pulls down to VOUT or VIN during faults |
| VOUT | Output voltage sense input | Senses load-side voltage; used as charge pump reference and reverse-protection reference |
| FAULT | Open-drain fault indicator | Pulled low during UV/OV faults, shutdown, or VIN < UVLO; sinks ≥500µA |
| SHDN | Shutdown control input | Active-low enable; places device in 5µA shutdown and initiates controlled MOSFET turn-off |
Key Features
| Feature | Design Value |
|---|---|
| No input capacitor or TVS required | Enables compact, cost-optimized designs by eliminating external surge suppression components for most 100V/–40V transients |
| Adjustable UV/OV thresholds | Allows precise customization of safe input window (e.g., 3.5V–18V) using standard 1% resistors without trimming |
| Reverse supply protection | Automatically connects GATE to negative VIN to block reverse current flow through back-to-back N-MOSFET body diodes |
| 32ms fault recovery delay | Debounces noisy inputs and prevents output chatter during AC line disturbances or load-dump oscillations |
| Low 70µA operating current | Supports continuous protection in always-on subsystems without compromising battery life or thermal budget |
Applications
| Automotive Load-Dump Protection | Industrial Power Input Conditioning |
|---|---|
|
Use Scenario: Protecting ECUs and infotainment modules from ISO 7637-2 Pulse 5a/b load-dump surges up to +100V in 24V vehicle electrical systems. IC Role / Device Role / Timing Role: Acts as front-end protection controller that isolates downstream circuitry by disabling back-to-back N-MOSFETs within microseconds of overvoltage detection. Use Value: Eliminates need for bulky TVS diodes while maintaining 125°C operation and surviving repeated 100V/50ms transients per AEC-Q100 stress profiles. |
Use Scenario: Securing programmable logic controllers (PLCs) and I/O modules against field-wiring errors, polarity reversal, and brownout conditions in factory automation. IC Role / Device Role / Timing Role: Serves as intelligent input supervisor that enforces user-defined voltage window (e.g., 18–32V) before enabling power delivery to sensitive digital circuitry. Use Value: Prevents latch-up and data corruption caused by undervoltage or reverse-connected 24V DC supplies, with no external components beyond MOSFETs and resistors. |
| Portable Instrumentation Power Management | Network Equipment DC Input Protection |
|
Use Scenario: Enabling hot-swap capability and reverse-polarity immunity in handheld test equipment powered by interchangeable AC adapters or batteries. IC Role / Device Role / Timing Role: Functions as polarity-agnostic input switch controller that blocks negative or out-of-range adapter voltages while supporting seamless battery-to-adapter switchover. Use Value: Allows single-port design for multiple power sources without risk of damage from misconnected 9V/12V/19V adapters or reversed battery packs. |
Use Scenario: Safeguarding PoE-powered switches, routers, and base stations against power supply faults in telecom infrastructure cabinets. IC Role / Device Role / Timing Role: Provides primary-stage protection for 48V DC inputs subject to lightning-induced surges, accidental grounding, and rectifier failures. Use Value: Withstands –40V reverse transients and 100V positive spikes while consuming only 70µA, reducing standby power and thermal load in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage/undervoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4367IDD#PBF | Same functionality but rated for –40°C to 85°C ambient; lower max junction temperature (125°C vs. 150°C) | Suitable for commercial/industrial indoor use; not qualified for under-hood automotive | Select when extended temperature range is unnecessary and cost optimization is prioritized |
| LTC4367HMS8#PBF | Identical electrical specs and temperature rating, but in 8-lead MSOP package (larger footprint, higher θJA = 160°C/W) | Better suited for prototyping or layouts where DFN rework is challenging; requires more PCB area | Choose for hand-soldering feasibility or legacy board compatibility where DFN assembly is constrained |
Compared with LTC4367IDD#PBF, LTC4367HDD#PBF offers guaranteed operation up to 125°C ambient - critical for engine bay placement - while compared with LTC4367HMS8#PBF, it delivers superior thermal performance in space-constrained designs due to its 3mm × 3mm DFN package and lower θJA (43°C/W).
Availability
LTC4367HDD#PBF is available at Aetrix Electronics and suitable for automotive load-dump protection, industrial PLC input conditioning, and portable instrumentation power management requiring stable component supply across extended temperature ranges.
Supply support for LTC4367HDD#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 LTC4367 product line delivers rugged, integrated protection controllers for DC power inputs - designed specifically to replace discrete diode/MOSFET/comparator solutions in safety-critical 24V and 48V systems.
FAQ
What is the maximum allowable input voltage for LTC4367HDD#PBF during fault conditions?
The LTC4367HDD#PBF is rated for –40V to 100V on the VIN pin under absolute maximum conditions. This means it can safely withstand transient overvoltages up to +100V and reverse voltages down to –40V without damage, making it suitable for automotive load-dump and industrial surge environments. The device remains functional within its 2.5V to 60V operating range.
Does LTC4367HDD#PBF require external TVS diodes for 100V protection?
No, the LTC4367HDD#PBF does not require external TVS diodes for most 100V overvoltage protection applications. Its internal architecture - including robust input stage design, charge pump isolation, and 100V absolute maximum VIN rating - eliminates the need for external clamping components in standard implementations, as confirmed in the datasheet's "No Input Capacitor or TVS Required" feature.
How does LTC4367HDD#PBF handle reverse supply connections?
The LTC4367HDD#PBF detects negative VIN via an internal reverse-voltage monitor and immediately connects the GATE pin to VIN. This forces both external back-to-back N-channel MOSFETs into cutoff, blocking reverse current flow through their body diodes. The action occurs rapidly, with GATE tracking VIN closely during –40V transients, as verified in Figure 8 of the datasheet.
What is the purpose of the 32ms GATE turn-on delay in LTC4367HDD#PBF?
The 32ms GATE turn-on delay in LTC4367HDD#PBF filters noise and prevents output chattering by requiring the input voltage to remain within the user-defined UV/OV window for at least 32ms after fault clearance. This timing is fixed for the LTC4367 variant (as opposed to the 500µs delay in LTC4367-1) and applies during power-up, fault recovery, and exit from shutdown.
Which external MOSFETs are recommended for use with LTC4367HDD#PBF in 24V automotive applications?
The datasheet explicitly recommends the Si7942 dual N-channel MOSFET for 24V automotive applications with LTC4367HDD#PBF. This device offers 100V VDS rating, 4V VTH(max), and 49mΩ RDS(ON), matching the controller's 100V fault tolerance and gate drive capability. Other compatible options include Si7956 (150V) and FDS3992 (100V), all listed in Table 1 of the LTC4367 datasheet.
LTC4367HDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Overvoltage, Undervoltage Protection
- Current - Supply:
- 70µA
- Voltage - Supply:
- 2.5V ~ 60V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC4367HDD#PBF FAQ
1.How can I place an order for LTC4367HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4367HDD#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 LTC4367HDD#PBF reliable?
The price and inventory of LTC4367HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4367HDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4367HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4367HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4367HDD#PBF?
LTC4367HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4367HDD#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 LTC4367HDD#PBF?
For technical support, including LTC4367HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4367HDD#PBF requirements.
6.How does Aetrix verify that LTC4367HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4367HDD#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 LTC4367HDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4367HDD#PBF?
All LTC4367HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4367HDD#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 LTC4367HDD#PBF part is unused and in its original packaging.
Return procedure for LTC4367HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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