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Analog Devices Inc. LTC4367IDD#PBF
- Part No.:
- LTC4367IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC4367IDD#PBF.pdf
- Description:
- SUPPLY PROTECTION CONTROLLER
- Quantity:
- Payment:
- Shipping:
Inventory:4,042
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Product details
Overview
LTC4367IDD#PBF from Analog Devices is a high-voltage, precision input fault protection controller that manages back-to-back N-channel MOSFETs to enforce a user-defined voltage window (e.g., 7V–36V) at VIN while blocking –40V reverse and +100V overvoltage faults. It operates from 2.5V to 60V supply, consumes only 70µA quiescent current, and delivers 13.1V gate drive enhancement - enabling low-RDS(on) MOSFET selection for automotive load-dump and industrial surge protection.
For engineers reviewing the LTC4367IDD#PBF datasheet, LTC4367IDD#PBF pinout, LTC4367IDD#PBF application, or LTC4367IDD#PBF equivalent, this page provides verified functional context, validated DFN-8 package mapping, confirmed 32ms fault recovery timing, and real-world design values for UV/OV threshold setting, GATE drive behavior, and reverse polarity blocking - all specific to the –40°C to +85°C industrial-grade variant.
Technical Context
The LTC4367IDD#PBF implements dual independent comparators (UV and OV) with 0.5V internal reference, 25mV hysteresis, and sub-2µs fault propagation delay. Its charge pump-based GATE driver delivers up to 13.1V enhancement referenced to VOUT, enabling full enhancement of N-channel MOSFETs even at low VIN (≥2.5V).
Reverse protection is achieved via an active VIN-monitoring circuit that connects GATE directly to negative VIN, forcing M2 into cutoff while leveraging body diode isolation. The device includes a 32ms turn-on delay timer to debounce AC line noise (50/60Hz) and prevent chattering during transient recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Protection Range | –40V to +100V - withstands automotive load dump and reverse battery connection without external TVS or input capacitor. |
| Operating Voltage | 2.5V to 60V - supports wide-input industrial and automotive systems including 12V/24V nominal rails. |
| GATE Drive ΔV | Up to 13.1V (VIN ≥12V) - ensures full enhancement of standard N-channel MOSFETs with VTH ≤4V. |
| Quiescent Current | 70µA typical - enables always-on protection in battery-backed or low-power industrial nodes. |
| Fault Recovery Delay | 32ms - debounces live insertion and blocks 50/60Hz AC power; distinct from LTC4367-1's 500µs variant. |
| UV/OV Threshold Accuracy | ±1.5% (500mV ref ±7.5mV) - enables precise 7V–36V window setting using standard 1% resistors. |
| Shutdown Current | 5µA - maintains ultra-low standby power when disabled via SHDN pin. |
Pinout & Package
Package: 8-lead (3mm × 3mm) plastic DFN with exposed pad (optional ground connection). Pin numbering follows standard DFN top-view orientation (Pin 1 = VIN, Pin 5 = GATE, Pin 9 = exposed pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | High-voltage input supply rail | Withstands –40V to +100V; powers internal LDO and charge pump; UVLO triggers at 1.8V–2.4V. |
| UV | Undervoltage comparator input | 0.5V falling threshold; sets lower fault boundary (e.g., 7V) via external resistor divider; <10nA leakage. |
| OV | Overvoltage comparator input | 0.5V rising threshold; sets upper fault boundary (e.g., 36V); clamped to ≤5V; 25mV hysteresis. |
| GND | Device ground reference | Reference for all internal circuits; exposed pad may be connected to PCB ground for thermal relief. |
| GATE | Gate drive output | Charge-pump-enhanced output referenced to VOUT; pulls down at 60mA during fault; tracks VIN when negative. |
| VOUT | Output voltage sense | Senses load-side voltage; serves as charge pump return; enables accurate gate drive referencing under varying load. |
| FAULT | Open-drain fault indicator | Pulled low on UV/OV fault, SHDN assertion, or VIN < UVLO; sinks 500µA max; compatible with 3.3V/5V logic. |
| SHDN | Shutdown control input | Active-low enable; 0.4–1.2V threshold; places device in 5µA shutdown; initiates controlled GATE ramp-down. |
Key Features
| Feature | Design Value |
|---|---|
| No external TVS or input capacitor required | Validated for –40V to +100V transients per Absolute Maximum Ratings; eliminates BOM cost and board space for most 24V automotive applications. |
| Adjustable UV/OV thresholds | Set via two-resistor dividers from VIN; 0.5V internal reference enables precise 3.5V–18V or 7V–36V windows using 1% resistors. |
| Reverse supply blocking | Active detection and GATE-VIN shorting below 0V prevents reverse current flow through back-to-back N-MOSFETs without P-channel complexity. |
| 32ms turn-on delay timer | Hardware-debounced recovery prevents chatter during noisy startup or marginal supply conditions; blocks 50/60Hz AC coupling. |
| Low-power operation | 70µA operating current and 5µA shutdown current support always-on protection in energy-constrained industrial sensors and remote nodes. |
Applications
| Automotive Load Dump Protection | Industrial Power Input Conditioning |
|---|---|
|
Use Scenario: 24V vehicle electrical system subjected to ISO 7637-2 Pulse 5a (100V/400ms load dump). IC Role / Device Role / Timing Role: Fault protection controller enforcing 12V–36V valid window; blocks >36V faults within <2µs; recovers after 32ms clean window. Use Value: Eliminates need for high-voltage TVS diodes and reduces system BOM cost by 30% versus discrete solutions. |
Use Scenario: Programmable logic controller (PLC) powered from unregulated 24V DC supply with risk of brownout or accidental reverse connection. IC Role / Device Role / Timing Role: Dual-threshold supervisor controlling back-to-back N-MOSFETs; asserts FAULT on <7V undervoltage or >36V overvoltage. Use Value: Prevents PLC reset or latch-up during field wiring errors; enables hot-swap capability with no external components. |
| Portable Instrumentation Power Guard | Network Equipment DC Input Protection |
|
Use Scenario: Handheld test equipment powered by interchangeable AC adapters (12V/15V/19V), some with reversed polarity. IC Role / Device Role / Timing Role: Reverse polarity blocker and voltage window enforcer; GATE tracks VIN during reverse events to ensure M2 remains off. Use Value: Guarantees safe operation regardless of adapter polarity or voltage rating; avoids field returns due to user error. |
Use Scenario: Telecom switch powered from –48V DC plant with risk of accidental +48V misconnection or transient surges. IC Role / Device Role / Timing Role: High-side protection controller isolating downstream DC/DC converters from reverse or overvoltage faults. Use Value: Maintains system uptime by preventing catastrophic failure of sensitive PoE controllers and PHYs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar input fault protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4367CDD#PBF | Same functionality and pinout; rated for 0°C to 70°C ambient instead of –40°C to 85°C. | Not suitable for under-hood automotive or outdoor industrial enclosures requiring extended temperature range. | Select LTC4367IDD#PBF when operation beyond 70°C ambient is required; C-grade is sufficient for lab or indoor use. |
| LTC4367IDD-1#PBF | Identical package and temperature grade, but features 500µs fault recovery (vs. 32ms) and faster startup timing. | Preferred for systems requiring rapid reconnection after brief transients (e.g., motor drives with regenerative braking spikes). | Choose LTC4367IDD-1#PBF only if 32ms delay causes unacceptable downtime; otherwise, LTC4367IDD#PBF provides superior noise immunity. |
Compared with LTC4367CDD#PBF, the LTC4367IDD#PBF extends operational reliability to harsher environments, while compared with LTC4367IDD-1#PBF, it trades faster recovery for robust 50/60Hz AC rejection and transient noise filtering - making it optimal for automotive and industrial power entry points where fault stability outweighs speed.
Availability
LTC4367IDD#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial PLC power conditioning, and portable instrumentation power guard applications requiring stable component supply across extended temperature ranges.
Supply support for LTC4367IDD#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 (acquired Linear Technology in 2017) designs high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LTC4367 family delivers precision input fault protection using integrated comparators, charge-pump gate drivers, and reverse-voltage monitoring - specifically engineered for robust front-end power conditioning in automotive and industrial systems.
FAQ
What is the maximum continuous input voltage the LTC4367IDD#PBF can withstand?
The LTC4367IDD#PBF has an absolute maximum VIN rating of –40V to +100V. This allows it to survive automotive load dump events (ISO 7637-2 Pulse 5a) and accidental reverse battery connections without damage or external protection components. Its operating range remains 2.5V to 60V for normal functionality, but the 100V withstand capability is a key reliability feature built into the silicon process and layout of the LTC4367IDD#PBF.
Does the LTC4367IDD#PBF require external MOSFETs, and what type should be used?
Yes, the LTC4367IDD#PBF requires two external N-channel MOSFETs connected back-to-back between VIN and VOUT. It is designed specifically for this topology to enable reverse polarity blocking. Recommended devices include Si7942 (100V, 49mΩ) for 24V automotive use or SiZ340 (30V, 10mΩ) for 12V systems. Gate threshold voltage must be ≤4V to ensure full enhancement with the LTC4367IDD#PBF's 13.1V gate drive.
How does the LTC4367IDD#PBF handle reverse supply conditions?
The LTC4367IDD#PBF detects negative VIN via an internal comparator and immediately connects the GATE pin to VIN. This forces the source-gate voltage of the downstream MOSFET (M2) to zero, keeping it fully off while allowing the upstream MOSFET's (M1) body diode to clamp. No external components are needed - the LTC4367IDD#PBF's active reverse protection eliminates the need for P-channel MOSFETs or series diodes, reducing conduction loss and BOM count.
Can the UV and OV thresholds be set independently on the LTC4367IDD#PBF?
Yes, the LTC4367IDD#PBF provides separate UV and OV pins, each with its own 0.5V internal reference and 25mV hysteresis. Independent resistor dividers from VIN allow fully customizable thresholds - for example, UV = 7V and OV = 36V - enabling precise adaptation to load requirements. Leakage current (<10nA) permits use of high-value resistors (e.g., 1MΩ range), minimizing quiescent current impact on the divider network.
What is the purpose of the 32ms turn-on delay in the LTC4367IDD#PBF?
The 32ms GATE turn-on delay in the LTC4367IDD#PBF filters noise and prevents chattering during marginal supply conditions. It ensures the input voltage remains stably within the user-defined UV/OV window for at least 32ms before reconnecting the load - effectively rejecting 50Hz/60Hz AC ripple and transient spikes. This hardware-enforced debounce is critical for reliable operation in electrically noisy automotive and industrial environments where the LTC4367IDD#PBF is commonly deployed.
LTC4367IDD#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 ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC4367IDD#PBF FAQ
1.How can I place an order for LTC4367IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4367IDD#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 LTC4367IDD#PBF reliable?
The price and inventory of LTC4367IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4367IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC4367IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4367IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4367IDD#PBF?
LTC4367IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4367IDD#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 LTC4367IDD#PBF?
For technical support, including LTC4367IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4367IDD#PBF requirements.
6.How does Aetrix verify that LTC4367IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4367IDD#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 LTC4367IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC4367IDD#PBF?
All LTC4367IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4367IDD#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 LTC4367IDD#PBF part is unused and in its original packaging.
Return procedure for LTC4367IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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