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Analog Devices Inc. LTC4364HMS-2#PBF
- Part No.:
- LTC4364HMS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4364HMS-2#PBF.pdf
- Description:
- IC SURGE STOPPER W/DIODE 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:444
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Product details
Overview
LTC4364HMS-2#PBF from Analog Devices is a high-voltage surge stopper with integrated ideal diode controller, designed to protect downstream loads from automotive load dump (up to 200V/1ms), reverse input (–40V), and output short events. It regulates output voltage at adjustable clamp levels (e.g., 27V), delivers 4A continuous current, and features automatic fault recovery with 0.1% retry duty cycle. Used in automotive power distribution and redundant supply ORing.
For engineers reviewing the LTC4364HMS-2#PBF datasheet, LTC4364HMS-2#PBF pinout, LTC4364HMS-2#PBF application, or LTC4364HMS-2#PBF equivalent, key selection criteria include overvoltage clamp adjustability, –40°C to 125°C operating range, AEC-Q100 qualification, and dual-MOSFET gate drive architecture for surge + reverse protection.
Technical Context
The LTC4364HMS-2#PBF implements two independent control loops: a voltage-regulating amplifier driving HGATE to clamp VOUT during overvoltage (e.g., 27V via FB divider), and a current-sensing amplifier driving DGATE to maintain ~30mV forward drop across the ideal diode MOSFET. Fault timing is capacitor-programmed on TMR with distinct pull-up currents for overvoltage (–2.2 µA typical) vs. overcurrent (–210 µA typical) to accelerate shutdown under severe overload.
It integrates undervoltage lockout (UV threshold = 1.25V, 50mV hysteresis) and overvoltage inhibit (OV threshold = 1.25V), both referenced to internal 1.25V bandgap. The LTC4364-2 variant enables auto-restart after fault cooldown (32-cycle 0.15V–1.35V oscillation), unlike the latch-off LTC4364-1, making it suitable for systems requiring unattended recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input; withstands –40V reverse input and 200V/1ms transient - supports cold-crank and load-dump immunity in 12V/24V automotive systems. |
| Output Clamp Accuracy | ±1.5% over temperature (FB = 1.25V ±15mV) - enables precise 27V regulation using standard resistor dividers. |
| Fault Timer Current | –2.2 µA (OV) / –210 µA (OC) into TMR pin - allows single capacitor to set distinct timeout durations for overvoltage vs. overcurrent faults. |
| Ideal Diode Forward Drop | 30mV regulated (typical) - reduces conduction loss by >90% vs. Schottky diode, enabling higher efficiency and thermal margin. |
| Shutdown Current | 10 µA max at 12V - enables always-on monitoring without battery drain in automotive keep-alive circuits. |
| Temperature Range | –40°C to +125°C ambient - qualified per AEC-Q100 Grade H for under-hood automotive deployment. |
| Package | 16-lead MSOP (4.0mm × 5.0mm) with exposed pad - provides low θJA = 120°C/W for thermally constrained PCB layouts. |
Pinout & Package
Package: 16-Lead Plastic MSOP (MS package), 4.0mm × 5.0mm body, exposed pad (pin 16) recommended for GND connection to improve thermal performance and EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Output voltage sense reference | Senses drain of HGATE-controlled pass MOSFET; triggers ENOUT high-impedance when VCC − VOUT < 0.7V - indicates full MOSFET turn-on. |
| SENSE (Pin 2) | Current sense input | Monitors voltage across external sense resistor; controls HGATE to limit ∆VSENSE−OUT to 50mV (normal) or 25mV (output short) - enables accurate current limiting. |
| DGATE (Pin 4) | Ideal diode gate driver output | Drives source-follower N-MOSFET for reverse polarity protection; actively regulates 30mV forward drop and pulls low within 1.5µs on reverse current - prevents output collapse during input failure. |
| SOURCE (Pin 5) | Common source return | Anode node for ideal diode; reference for DGATE/HGATE drive; withstands –40V - defines ground-referenced operation for back-to-back MOSFET configuration. |
| HGATE (Pin 6) | Surge stopper gate driver output | Controls series N-MOSFET pass device; regulates VOUT via feedback to FB; pulls down with 1mA during fault - implements active clamping instead of passive Zener. |
| VCC (Pin 8) | Main supply input | Accepts 4V–80V; survives –40V reverse bias; powers internal circuitry - eliminates need for separate bias rail in wide-input systems. |
| SHDN (Pin 9) | Shutdown control input | Pulled below 0.5V to enter 10µA shutdown; floats to ~4V when open - enables simple microcontroller-controlled power gating. |
| UV (Pin 10) | Undervoltage comparator input | Threshold = 1.25V; disables HGATE/DGATE if below - prevents operation during battery brownout or cranking. |
| OV (Pin 11) | Overvoltage inhibit input | Threshold = 1.25V; blocks auto-restart if above - ensures safe re-engagement only after input returns to nominal range. |
| GND (Pin 12) | Device ground reference | Return path for internal amplifiers and logic; connects to system GND - must be low-impedance for stable sensing and timing. |
| FLT (Pin 13) | Fault open-drain output | Pulls low at TMR = 1.25V (warning), stays low until fault cleared and cooldown complete - signals impending or active shutdown to host controller. |
| ENOUT (Pin 14) | Enable output indicator | High-impedance when VOUT > VCC − 0.7V - directly indicates MOSFET conduction state without external sensing. |
| TMR (Pin 15) | Fault timer capacitor connection | Charged by current sources proportional to VCC − VOUT - sets programmable delay before HGATE turn-off; determines cool-down cycle timing. |
| FB (Pin 16) | Voltage regulator feedback input | Internal 1.25V reference target; connected to resistive divider from OUT to GND - sets precise output clamp voltage (e.g., 27V = 1.25V × (R1+R2)/R2). |
Key Features
| Feature | Design Value |
|---|---|
| Auto-recovering overvoltage protection | LTC4364-2 variant performs 32-cycle TMR cooldown (0.15V ↔ 1.35V) then restarts if OV pin is clear - eliminates manual reset in infotainment or ADAS modules. |
| Reverse input protection to –40V | VCC pin withstands –40V reverse battery without damage or latch-up - meets ISO 16750-2 requirements for automotive electronics. |
| Programmable fault timer | Single external capacitor sets warning (1.25V), shutdown (1.35V), and cooldown timing - simplifies design vs. multi-capacitor solutions. |
| Low quiescent current shutdown | 10 µA max ICC(SHDN) at 12V - extends battery life in always-on telematics and gateway ECUs. |
| Integrated ideal diode control | Regulates 30mV forward drop across external N-MOSFET - replaces 0.4V Schottky, saving >1W at 4A and improving thermal headroom. |
| AEC-Q100 Grade H qualification | Rated for –40°C to +125°C operation with full automotive reliability testing - approved for safety-critical power rails in engine control units. |
Applications
| Automotive Load Dump Protection | Redundant Supply ORing |
|---|---|
|
Use Scenario: Protects infotainment head unit from 120V load dump transients during alternator field decay in 12V vehicles. IC Role / Device Role / Timing Role: LTC4364HMS-2#PBF acts as active clamp controller, regulating VOUT at 27V while dissipating surge energy in external MOSFET M1. Use Value: Enables uninterrupted operation during 100ms transients; eliminates need for bulky TVS diodes and reduces board area by 40% vs. passive clamping. |
Use Scenario: ORs primary and backup 24V supplies in ADAS domain controller to ensure continuous power during main supply failure. IC Role / Device Role / Timing Role: LTC4364HMS-2#PBF drives ideal diode MOSFET M2 on each supply rail to block reverse current and enable seamless switchover. Use Value: Achieves <1µs reverse current cutoff and <30mV forward drop - cuts power loss by 85% vs. discrete diodes and prevents supply cross-talk. |
| Hot-Swap Power Entry | Industrial 48V System Protection |
|
Use Scenario: Safely inserts server blade into live 48V backplane without causing bus voltage sag or arcing. IC Role / Device Role / Timing Role: LTC4364HMS-2#PBF controls inrush current via HGATE slew rate and clamps VOUT during plug-in transients. Use Value: Limits peak inrush to <2A using soft-start; prevents false triggering of upstream OCP and enables hot-plug compliance per IEC 61000-4-5. |
Use Scenario: Shields PLC I/O module from 80V surges induced by inductive load switching in factory automation. IC Role / Device Role / Timing Role: LTC4364HMS-2#PBF monitors VCC and initiates clamp regulation before downstream LDOs are stressed. Use Value: Withstands repeated 80V/10ms surges per IEC 61000-4-4; extends system MTBF by preventing cumulative degradation of DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection and ideal diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#PBF | Higher 100V absolute max VCC rating; adds adjustable UV/OV thresholds via pins; same 16-lead MSOP package. | Supports 48V industrial systems with wider transient margin; requires additional resistors for threshold programming. | Select LTC4365IMS-2#PBF when input may exceed 80V or when programmable UV/OV thresholds are required for custom trip points. |
| TPS26631PWPR | Integrated 80V MOSFET; no external FET needed; fixed 28V overvoltage clamp; lower 2.5A current rating. | Reduces BOM count but lacks ideal diode function and reverse input protection; not AEC-Q100 qualified. | Choose TPS26631PWPR for space-constrained non-automotive designs where integrated FET and simplicity outweigh reverse protection needs. |
Compared with LTC4364HMS-2#PBF, LTC4365IMS-2#PBF offers extended voltage range and configurability at the cost of added external components, while TPS26631PWPR trades flexibility and automotive qualification for integration and ease of use in lower-current applications.
Availability
LTC4364HMS-2#PBF is available at Aetrix Electronics and suitable for automotive power distribution, redundant supply ORing, and industrial 48V system protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC4364HMS-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The LTC4364HMS-2#PBF belongs to Analog Devices' Surge Stopper product line, engineered specifically for robust, high-reliability power path protection in harsh environments such as automotive under-hood and industrial control cabinets.
FAQ
What is the key functional difference between LTC4364HMS-2#PBF and LTC4364HMS-1#PBF?
The LTC4364HMS-2#PBF implements automatic fault recovery: after an overvoltage or overcurrent event, it performs a 32-cycle TMR cooldown and restarts if the OV pin is below threshold. In contrast, the LTC4364HMS-1#PBF latches off permanently until SHDN is cycled. This makes LTC4364HMS-2#PBF ideal for systems requiring unattended recovery, such as telematics gateways or ADAS sensors.
How does LTC4364HMS-2#PBF achieve reverse input protection to –40V?
The LTC4364HMS-2#PBF achieves –40V reverse input protection through ruggedized input structures on the VCC and SHDN pins, which are explicitly rated for –40V in the Absolute Maximum Ratings table. During reverse battery conditions, internal protection diodes and charge pump isolation prevent latch-up or damage, ensuring compliance with ISO 16750-2 automotive stress tests without external components.
Can LTC4364HMS-2#PBF regulate output voltage to exactly 27V, and how is that set?
Yes, LTC4364HMS-2#PBF regulates output voltage to precisely 27V using the FB pin and an external resistor divider. With an internal 1.25V reference, a 27V clamp requires R1/R2 = (27V / 1.25V) − 1 ≈ 20.6. For example, R2 = 10kΩ and R1 = 206kΩ yields 27.05V (±1.5% over temperature). The FB servo loop maintains 1.25V at the FB node during overvoltage events.
What is the purpose of the TMR pin on LTC4364HMS-2#PBF, and how is its timing determined?
The TMR pin on LTC4364HMS-2#PBF sets fault timing via an external capacitor to ground. Its voltage ramps up with current sources proportional to VCC − VOUT: –2.2 µA for overvoltage, –210 µA for overcurrent. At 1.25V, FLT asserts; at 1.35V, HGATE turns off. After fault clearance, TMR cycles 32 times between 0.15V and 1.35V (2 µA charge/discharge) to implement cooldown before auto-restart.
Does LTC4364HMS-2#PBF require external MOSFETs, and what are the key selection criteria?
Yes, LTC4364HMS-2#PBF requires two external N-channel MOSFETs: one for surge stopping (HGATE-controlled) and one for ideal diode (DGATE-controlled). Key criteria include RDS(ON) < 10mΩ at VGS = 10V for low conduction loss, SOA rating sufficient for worst-case surge energy (e.g., 200V × 4A × 1ms), and logic-level gate drive compatibility with the 12V gate drive swing provided by HGATE/DGATE.
LTC4364HMS-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- General Purpose
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LTC4364HMS-2#PBF FAQ
1.How can I place an order for LTC4364HMS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4364HMS-2#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 LTC4364HMS-2#PBF reliable?
The price and inventory of LTC4364HMS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4364HMS-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC4364HMS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4364HMS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4364HMS-2#PBF?
LTC4364HMS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4364HMS-2#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 LTC4364HMS-2#PBF?
For technical support, including LTC4364HMS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4364HMS-2#PBF requirements.
6.How does Aetrix verify that LTC4364HMS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4364HMS-2#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 LTC4364HMS-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC4364HMS-2#PBF?
All LTC4364HMS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4364HMS-2#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 LTC4364HMS-2#PBF part is unused and in its original packaging.
Return procedure for LTC4364HMS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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