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Analog Devices Inc. LT4356MPS-3#PBF
- Part No.:
- LT4356MPS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356MPS-3#PBF.pdf
- Description:
- SURGE STOPPER SMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,927
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Product details
Overview
LT4356MPS-3#PBF from Analog Devices is a surge protection controller that regulates output voltage during automotive load dump (up to 80V) by driving an external N-channel MOSFET, provides overcurrent protection via 50mV current-sense threshold, features adjustable latchoff fault timer with early warning (FLT pin), and operates across –55°C to 125°C in 16-pin SO package for harsh-environment applications including battery-powered industrial systems and avionics.
For engineers reviewing the LT4356MPS-3#PBF datasheet, LT4356MPS-3#PBF pinout, LT4356MPS-3#PBF application, or LT4356MPS-3#PBF equivalent, key selection considerations include its –60V to 100V SHDN tolerance, reverse input protection capability, auxiliary amplifier for level detection or linear regulator control, and AEC-Q100 qualification for automotive use.
Technical Context
The LT4356MPS-3#PBF implements dual-fault protection using independent voltage and current amplifiers: the FB amplifier servo-regulates GATE to clamp VOUT at 1.25V × (1 + R1/R2), while the SNS amplifier limits ΔVSNS = VCC – VSNS to 50mV. Fault timing is dynamically scaled by (VCC – VOUT), delivering shorter turn-off delays under higher MOSFET stress to enforce SOA compliance.
Its shutdown logic requires precise SHDN slew rate (>10V/ms) and pulse width (>100µs) for reset; FLT asserts at VTMR = 1.25V (early warning), and GATE latches off at VTMR = 1.35V. The auxiliary amplifier (AOUT/IN+) operates with internal 1.25V reference and supports open-collector sinking up to 2mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - enables operation during automotive cold crank (≥4V) and withstands 80V load dump transients. |
| Overvoltage Clamp Threshold | Adjustable via FB divider - sets regulated output voltage using internal 1.25V reference for precise system-level rail control. |
| Overcurrent Sense Threshold | 50mV - limits power dissipation in external sense resistor and ensures fast response to short-circuit faults. |
| Fault Timer Current Range | 2µA to 260µA - scales with (VCC – VOUT) to adapt turn-off timing to MOSFET safe operating area (SOA) constraints. |
| Shutdown Quiescent Current | <7µA - minimizes battery drain in always-on vehicle subsystems and remote sensors. |
| Temperature Range | –55°C to 125°C - qualified for extended-temperature industrial, avionic, and military-grade deployments. |
| Reverse Input Protection | –60V - allows back-to-back FET configuration to replace Schottky diodes, reducing forward drop and power loss. |
Pinout & Package
LT4356MPS-3#PBF uses a 16-pin plastic SO package (JEDEC MS-012AA) with exposed pad optional for thermal enhancement. Pin 1 is TMR; pins 3 and 13 are NC (no connect); pin 16 is SHDN. Absolute maximum ratings include –60V to 100V on SHDN and –60V on SNS relative to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor connection | Charging current scales with (VCC – VOUT); 1.25V triggers FLT, 1.35V latches GATE off. |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; connects to resistive divider to set output clamp voltage. |
| OUT | MOSFET source voltage sense | Senses VDS for fault timer scaling and enables EN pin assertion when VOUT > VCC – 0.7V. |
| GATE | N-channel MOSFET gate driver output | Charge-pump driven; clamped to 10V–16V above OUT; delivers 150mA pull-down during OV fault. |
| SNS | Current sense input | Monitors ΔVSNS = VCC – VSNS; internal amplifier holds at 50mV during overcurrent events. |
| VCC | Main supply input | Operates from 4V–80V; withstands –60V reverse bias; powers all internal blocks including charge pump. |
| SHDN | Shutdown control input | TTL-compatible; pulls device into <7µA mode; tolerates –60V to 100V; requires 100µs low pulse + >10V/ms rise for reset. |
| AOUT | Auxiliary amplifier output | Open-collector; sinks up to 2mA; used for level detection comparator or PNP linear regulator control. |
| IN+ | Auxiliary amplifier non-inverting input | Clamped to 7V; connects to external signal for comparator function; tie to GND if unused. |
| FLT | Fault indicator output | Open-collector; pulls low at VTMR = 1.25V to warn of impending power-down due to OV or OC condition. |
| EN | Enable status output | Open-collector; high-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until VOUT resets. |
| GND | Device ground reference | Common return for all analog and power circuits; exposed pad may be connected to PCB GND. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer scaling | Timer current varies from 2µA to 260µA based on (VCC – VOUT), ensuring MOSFET stays within SOA during transient stress. |
| Two-stage fault response | FLT pin asserts at 1.25V (early warning), GATE latches off at 1.35V - enables system backup before power loss. |
| Integrated auxiliary amplifier | Internal 1.25V reference + AOUT/IN+ pins support comparator hysteresis or PNP-based linear regulation without external references. |
| Robust reverse polarity handling | –60V rating on SNS and VCC pins enables back-to-back N-FET reverse protection, eliminating Schottky diode losses. |
| Automotive-grade reliability | AEC-Q100 qualified (MP grade), –55°C to 125°C operation, and 100V-tolerant SHDN support mission-critical vehicle electronics. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Systems |
|---|---|
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 at user-defined clamp voltage while dynamically adjusting fault timer to match MOSFET SOA. Use Value: Enables uninterrupted operation during transients and prevents MOSFET destruction during sustained overvoltage events. | Use Scenario: Safely inserting field-replaceable modules into live 24V/48V industrial PLC backplanes without disrupting upstream power. IC Role / Device Role / Timing Role: High-side switch controller with programmable current limit and soft-start via TMR capacitor selection. Use Value: Eliminates arcing and inrush damage while providing fault indication (FLT) and latchoff for system-level fault management. |
| Avionic Power Conditioning | Battery-Powered Remote Sensors |
Use Scenario: Securing flight-critical navigation units against 80V surges in MIL-STD-704F-compliant 28V aircraft power systems. IC Role / Device Role / Timing Role: Overvoltage/overcurrent protector with –55°C to 125°C operation and reverse-input tolerance for dual-battery redundancy schemes. Use Value: Meets DO-160 lightning-induced transient requirements and supports cold-soak startup without derating. | Use Scenario: Extending battery life in wireless IoT nodes deployed in remote locations with unpredictable input conditions. IC Role / Device Role / Timing Role: Low-quiescent (<7µA) shutdown controller enabling ultra-low-power sleep modes while retaining surge resilience. Use Value: Reduces standby current by >99% versus always-on protection ICs, extending 2xAA cell life to multi-year deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-3#PBF | Fixed 5.8V overvoltage clamp; no adjustable FB loop; lower VCC max (40V); integrated MOSFET driver only (no external FET control). | Best for fixed-rail 5V/3.3V systems where simplicity outweighs adjustability; unsuitable for 12V/24V/48V rails requiring custom clamping. | Select LTC4365IMS-3#PBF only when clamp voltage is fixed and supply ≤40V; LT4356MPS-3#PBF required for programmable clamping and 80V operation. |
| TPS26631PWPR | Integrated 80V eFuse with fixed 1.2A current limit; no overvoltage regulation; no auxiliary amplifier; smaller 16-pin HTSSOP package. | Targets USB-C PD and PoE-powered devices needing compact, fixed-current limiting; lacks voltage regulation and analog monitoring capability. | Choose TPS26631PWPR for space-constrained designs needing only current limiting; LT4356MPS-3#PBF remains preferred for combined OV/OC regulation with design flexibility. |
Compared with LTC4365IMS-3#PBF and TPS26631PWPR, LT4356MPS-3#PBF uniquely combines adjustable overvoltage regulation, dynamic SOA-aware fault timing, reverse-input protection, and an auxiliary amplifier - making it the only option for high-voltage, high-reliability systems requiring both precision clamping and analog supervision.
Availability
LT4356MPS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap systems, and avionic power conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT4356MPS-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 industrial, automotive, communications, and healthcare markets with precision power, sensing, and protection solutions.
The LT4356 family is designed for high-reliability DC power path protection in harsh environments - specifically targeting automotive, avionic, and industrial systems where survivability during 80V transients and –60V reverse polarity events is mandatory.
FAQ
What is the maximum input voltage the LT4356MPS-3#PBF can withstand during a surge event?
The LT4356MPS-3#PBF supports continuous operation up to 80V on VCC and can survive transient surges at this level, such as automotive load dump. Its absolute maximum VCC rating is 80V, and it also tolerates –60V reverse bias on VCC and SNS pins - critical for reverse battery protection in vehicle systems. This makes LT4356MPS-3#PBF suitable for 24V and 48V industrial rails as well as 12V automotive architectures.
How does the LT4356MPS-3#PBF implement overcurrent protection?
The LT4356MPS-3#PBF monitors the voltage drop 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 servo-controlled to limit current through the external N-channel MOSFET. Simultaneously, a scaled current charges the TMR capacitor - triggering FLT at 1.25V and latching GATE off at 1.35V. This dual-threshold scheme is integral to LT4356MPS-3#PBF's robust fault management.
Can the LT4356MPS-3#PBF be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes - the LT4356MPS-3#PBF supports reverse input protection down to –60V on VCC and SNS pins, enabling implementation of back-to-back N-channel MOSFETs instead of lossy Schottky diodes. This configuration reduces forward voltage drop and power dissipation, improving efficiency in battery-powered and thermally constrained systems. The SHDN pin also withstands –60V, ensuring reliable control during reverse-battery conditions - a key capability of LT4356MPS-3#PBF.
What is the role of the auxiliary amplifier in the LT4356MPS-3#PBF?
The auxiliary amplifier in LT4356MPS-3#PBF consists of IN+ (non-inverting input), AOUT (open-collector output), and an internal 1.25V reference connected to the inverting input. It can be configured as a precision voltage comparator with external hysteresis or as a linear regulator controller driving an external PNP pass transistor. With 2mA sink capability on AOUT, it supports direct LED or optocoupler interfacing - adding supervisory functionality not found in basic eFuses or TVS controllers.
How do I reset the LT4356MPS-3#PBF after a fault-induced latchoff?
To reset LT4356MPS-3#PBF after GATE latchoff, pull the SHDN pin below 0.4V for at least 100µs, then raise it above 2.1V with a slew rate faster than 10V/ms. This sequence clears the internal fault latch and re-enables GATE drive. Do not attempt reset before the TMR pin discharges to ~0.5V (typical discharge time ~45ms with 1µF CTMR); premature reset risks immediate re-fault. This precise timing requirement is a defined behavior of LT4356MPS-3#PBF's fault recovery architecture.
LT4356MPS-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT4356MPS-3#PBF FAQ
1.How can I place an order for LT4356MPS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356MPS-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 LT4356MPS-3#PBF reliable?
The price and inventory of LT4356MPS-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 LT4356MPS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356MPS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356MPS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356MPS-3#PBF?
LT4356MPS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356MPS-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 LT4356MPS-3#PBF?
For technical support, including LT4356MPS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356MPS-3#PBF requirements.
6.How does Aetrix verify that LT4356MPS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356MPS-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 LT4356MPS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356MPS-3#PBF?
All LT4356MPS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356MPS-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 LT4356MPS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356MPS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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