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Analog Devices Inc. LT4356CMS-3#PBF
- Part No.:
- LT4356CMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356CMS-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:830
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Product details
Overview
LT4356CMS-3#PBF from Analog Devices is a surge protection controller that regulates output voltage during automotive load dump or industrial transients by driving an external N-channel MOSFET. It features adjustable 1.25V feedback clamping, 50mV overcurrent sensing, fault latching with timer-based shutdown, and reverse input protection to –60V. It operates from 4V to 80V and is used in high-reliability battery-powered systems requiring uninterrupted operation under surge stress.
For engineers reviewing the LT4356CMS-3#PBF datasheet, LT4356CMS-3#PBF pinout, LT4356CMS-3#PBF application, or LT4356CMS-3#PBF equivalent, key selection criteria include its 10-pin MSOP package, –40°C to 85°C temperature grade (I-grade), 7µA shutdown current, adjustable fault timer via TMR capacitor, and dual overvoltage/overcurrent protection with early warning FLT output.
Technical Context
The LT4356CMS-3#PBF implements dual-loop protection: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current-sense amplifier limiting ΔVSNS to 50mV during overcurrent faults. Both conditions activate a programmable fault timer (TMR pin) whose charging current scales with VDS across the external MOSFET - 2–50µA for overvoltage, 4–260µA for overcurrent - enabling SOA-optimized turn-off timing.
It integrates a shutdown input (SHDN) tolerant to –60V to 100V, an auxiliary amplifier (AOUT/IN+) configurable as comparator or linear regulator controller, and open-collector outputs (FLT, EN) rated for 80V sink capability. The GATE driver uses an internal charge pump to deliver >10V gate drive above OUT, supporting standard-threshold N-MOSFETs above 8V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4V to 80V - enables operation during automotive cold crank (≥4V) and withstands 80V load dump transients. |
| Overvoltage Clamp | Adjustable via FB divider; internally regulated to 1.25V - sets precise output clamp voltage independent of supply variation. |
| Overcurrent Threshold | ΔVSNS = 50mV - limits sense resistor power loss and enables accurate current limiting with low-value, high-power resistors. |
| Shutdown Current | <7µA - minimizes standby drain in always-on automotive modules and battery-backed systems. |
| Fault Timer Input | TMR pin charges with VDS-scaled current (2–260µA) - dynamically adapts fault timeout to MOSFET stress, preserving SOA. |
| Reverse Input Rating | –60V on VCC, SNS, SHDN - supports reverse-battery protection without external diodes or FETs. |
| Package & Temp Grade | 10-Lead MSOP, –40°C to 85°C (I-grade) - qualified for industrial and automotive under-hood environments. |
Pinout & Package
LT4356CMS-3#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm × 1.1mm), thermally optimized for industrial and automotive PCB layouts. Exposed pad is not present in MSOP variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage regulation feedback input | Connects to resistive divider; internal 1.25V reference enables precise, adjustable output clamping during overvoltage. |
| OUT | MOSFET source voltage sense | Senses source node of external N-MOSFET; sets EN latch threshold and TMR charging current baseline. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output clamped to 14V above OUT; delivers >10V gate drive for standard-threshold MOSFETs. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; internal amplifier enforces 50mV limit for overcurrent protection. |
| VCC | Main supply input | Accepts 4–80V; withstands –60V reverse bias - eliminates need for input polarity protection diode. |
| TMR | Fault timer capacitor connection | Capacitor to GND sets fault timeout; current scales with VDS to match MOSFET SOA during transient stress. |
| FLT | Open-collector fault indicator | Pulls low at 1.25V TMR threshold - provides 100ms warning before MOSFET shutdown; sinks up to 3mA from 80V. |
| SHDN | Shutdown control input | TTL-compatible input; pulls device into <7µA mode; withstands –60V to 100V - robust against battery reversal and load dump. |
| EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset - signals healthy pass transistor state. |
| GND | Device ground reference | Common return for all analog and power paths; required for accurate current sensing and feedback regulation. |
Key Features
| Feature | Design Value |
|---|---|
| VCC-to-SNS overcurrent sensing | 50mV threshold with ±5mV accuracy over full temperature range - enables use of low-value, non-inductive shunts with minimal IR drop. |
| VDS-adaptive fault timer | TMR current scales from 2µA (0.5V VDS) to 260µA (80V VDS) - ensures faster MOSFET turn-off under high-stress overcurrent vs. overvoltage. |
| Auxiliary amplifier (AOUT/IN+) | Internal 1.25V reference + rail-to-rail output capable of sinking 2mA - supports standalone voltage monitoring or PNP linear regulator control without extra ICs. |
| Robust SHDN interface | –60V to 100V absolute max rating, 0.4V/2.1V logic thresholds, 10V/ms slew requirement - prevents false shutdown during ESD or fast transients. |
| Load-dump hardened architecture | Continuous 80V operation with 125°C junction max and 160°C/W θJA - sustains regulation during 60V/200ms automotive load dump per ISO 7637-2. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Entry |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to safe clamp voltage while sustaining load operation; fault timer prevents MOSFET thermal runaway. Use Value: Enables continuous operation during ISO 7637-2 Pulse 5a events without system reset or brownout, reducing warranty claims and field failures. |
Use Scenario: Safely inserting server backplane cards into live 48V intermediate bus without arcing or voltage sag. IC Role / Device Role / Timing Role: High-side switch controller with soft-start via gate slew control and overcurrent foldback during insertion inrush. Use Value: Eliminates need for discrete hot-swap controllers and current-limiting MOSFET drivers, reducing BOM count and layout area. |
| Battery-Powered System Reverse Polarity Guard | Avionics Transient Suppression |
|
Use Scenario: Preventing damage from accidental reverse battery connection in portable medical devices or handheld test equipment. IC Role / Device Role / Timing Role: Reverse-input protector using back-to-back N-MOSFETs controlled by LT4356CMS-3#PBF's gate drive and SHDN logic. Use Value: Achieves <100mV forward drop vs. 300–500mV Schottky diode solution - extends battery runtime and reduces heat generation. |
Use Scenario: Shielding flight control electronics from 100V/10µs lightning-induced surges per DO-160 Section 22. IC Role / Device Role / Timing Role: Fast-response overvoltage limiter clamping output within 250ns (tOFF(OV) = 0.25µs typical) to protect downstream DC-DC converters. Use Value: Meets avionic surge immunity requirements without TVS diodes that degrade over time or add capacitance to sensitive analog signal paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#PBF | Fixed 28.5V overvoltage clamp; no adjustable FB loop; integrated MOSFET driver only (no external FET control). | Targeted at simpler, lower-current (<2A) protection where fixed clamp suffices and board space is constrained. | Choose LTC4365IMS-2#PBF if clamp voltage is fixed, current is ≤2A, and integrated driver simplifies design - but LT4356CMS-3#PBF offers higher current scalability and precision regulation. |
| TPS26631PWPR | Integrated 42V eFuse with 1.2A current limit; no overvoltage regulation; fixed 3.3ms fault timer; no reverse-input rating. | Designed for USB PD and low-voltage industrial ports where overcurrent-only protection is sufficient. | Choose TPS26631PWPR for cost-sensitive, low-power USB-C or PoE edge devices - but LT4356CMS-3#PBF provides superior high-voltage survivability, adjustable clamping, and reverse-battery tolerance. |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, the LT4356CMS-3#PBF uniquely combines adjustable overvoltage regulation, VDS-adaptive fault timing, –60V reverse input support, and external N-MOSFET control - making it the only option for high-current, high-reliability automotive and avionic surge suppression where precise output clamping and MOSFET SOA management are mandatory.
Availability
LT4356CMS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power entry, and avionics transient suppression requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT4356CMS-3#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 precision instrumentation, industrial automation, and automotive safety markets since 1965.
The LT4356 family is designed specifically for high-reliability power path protection in harsh environments - delivering robust surge stopping, fault latching, and MOSFET SOA optimization for automotive, avionic, and industrial systems operating from 4V to 80V.
FAQ
What is the maximum input voltage the LT4356CMS-3#PBF can withstand continuously?
The LT4356CMS-3#PBF supports continuous operation from 4V to 80V on its VCC pin. Its absolute maximum rating allows VCC to be pulled to –60V during reverse battery conditions without damage. This makes the LT4356CMS-3#PBF suitable for automotive applications subject to load dump and cold-crank transients, where sustained 80V operation is required per ISO 7637-2 standards.
How does the LT4356CMS-3#PBF implement overcurrent protection?
The LT4356CMS-3#PBF monitors the voltage difference between VCC and SNS pins, regulating it to a precise 50mV threshold using an internal current-sense amplifier. When this threshold is exceeded, the GATE pin is servoed to limit current through the external N-MOSFET. A VDS-scaled current then charges the TMR capacitor - reaching 1.25V triggers FLT assertion, and 1.35V forces GATE shutdown. This ensures overcurrent response adapts to MOSFET stress.
Can the LT4356CMS-3#PBF be used with logic-level MOSFETs?
Yes - the LT4356CMS-3#PBF's GATE driver delivers ≥4.5V gate drive when VCC is as low as 4V, and ≥10V when VCC exceeds 8V. For systems operating below 8V (e.g., cold-crank automotive), a logic-level N-MOSFET with VGS(th) ≤3V is recommended to ensure full enhancement. At higher VCC, standard-threshold MOSFETs (VGS(th) ≈4V) operate reliably due to guaranteed >10V gate overdrive.
What is the function of the TMR pin on the LT4356CMS-3#PBF?
The TMR pin on the LT4356CMS-3#PBF connects to an external capacitor that sets both the fault timeout and early-warning period. During overvoltage or overcurrent events, a current source charges this capacitor. The charging current scales with VDS across the external MOSFET - from 2µA (low stress) to 260µA (high stress) - ensuring the MOSFET turns off faster under conditions where SOA margin is most critical. FLT asserts at 1.25V; GATE shuts down at 1.35V.
Does the LT4356CMS-3#PBF support reverse battery protection?
Yes - the LT4356CMS-3#PBF supports reverse input protection to –60V on VCC, SNS, and SHDN pins. It enables implementation of back-to-back N-MOSFET configurations (replacing Schottky diodes) for near-zero forward voltage drop and bidirectional blocking. This capability eliminates power loss and heat generation associated with traditional reverse-polarity solutions, extending battery life in portable and automotive systems.
LT4356CMS-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT4356CMS-3#PBF FAQ
1.How can I place an order for LT4356CMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CMS-3#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 LT4356CMS-3#PBF reliable?
The price and inventory of LT4356CMS-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356CMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CMS-3#PBF?
LT4356CMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CMS-3#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 LT4356CMS-3#PBF?
For technical support, including LT4356CMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CMS-3#PBF requirements.
6.How does Aetrix verify that LT4356CMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CMS-3#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 LT4356CMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CMS-3#PBF?
All LT4356CMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CMS-3#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 LT4356CMS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356CMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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