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Analog Devices Inc. LT4356MPMS-3#TRPBF
- Part No.:
- LT4356MPMS-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356MPMS-3#TRPBF.pdf
- Description:
- SURGE STOPPER SMD
- Quantity:
- Payment:
- Shipping:
Inventory:8,522
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Product details
Overview
LT4356MPMS-3#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients (e.g., automotive load dump) and limiting current via external N-channel MOSFET control. It operates from 4V to 80V, features –55°C to 125°C extended temperature range, 50mV adjustable overcurrent threshold, and latches off after fault timer expiration. Used in aerospace-grade power rail protection.
For engineers reviewing the LT4356MPMS-3#TRPBF datasheet, LT4356MPMS-3#TRPBF pinout, LT4356MPMS-3#TRPBF application, or LT4356MPMS-3#TRPBF equivalent, key selection criteria include its AEC-Q100-qualified MSOP-10 package, –60V reverse input tolerance, 7µA shutdown current, and dual-fault (overvoltage + overcurrent) timer with inverse-VDS scaling for MOSFET SOA compliance.
Technical Context
The LT4356MPMS-3#TRPBF integrates a voltage servo amplifier (FB pin referenced to 1.25V) and current-sense amplifier (ΔVSNS = 50mV clamp) to independently regulate output voltage and limit load current. Its fault timer (TMR pin) charges with a VCC–VOUT-dependent current-2µA at 0.5V up to 50µA at 75V for overvoltage, and 4µA to 260µA for overcurrent-ensuring MOSFET safe operating area adherence.
It drives an external N-channel MOSFET via GATE pin (clamped to VOUT + 14V), supports reverse input protection down to –60V, and includes an auxiliary amplifier (AOUT/IN+) configurable as comparator or linear regulator controller. Shutdown (SHDN) tolerates –60V to 100V and reduces quiescent current to ≤7µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V operation; enables cold-crank compatibility in automotive systems. |
| Overcurrent Threshold | Adjustable 42.5mV to 57mV ΔVSNS; sets precise current limit via external sense resistor. |
| Fault Timer Scaling | VCC–VOUT-proportional TMR current (2–50µA OV, 4–260µA OC); dynamically matches MOSFET SOA. |
| Shutdown Current | ≤7µA at TA = –55°C to 125°C; ensures ultra-low power loss in always-on systems. |
| Reverse Input Rating | Withstands –60V on VCC/SNS/SHDN pins; eliminates need for external reverse-battery diodes. |
| Output Clamp Accuracy | FB servo voltage = 1.215V to 1.275V; defines ±2.5% regulation tolerance for output voltage setting. |
| Operating Temp Range | –55°C to +125°C (MP grade); qualified for military, avionic, and harsh-environment industrial use. |
Pinout & Package
LT4356MPMS-3#TRPBF uses a 10-lead plastic MSOP package (3mm × 3mm × 1.1mm), with exposed pad optional for thermal enhancement. Pin functions are validated per Analog Devices Rev F datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage Regulator Feedback Input | Connects to resistive divider; 1.25V internal reference enables precise output voltage clamping. |
| OUT | Output Voltage Sense Input | Senses MOSFET source voltage; triggers EN latch and TMR charging during overvoltage events. |
| GATE | N-Channel MOSFET Gate Drive Output | Charge-pump-driven output clamped to VOUT + 14V; regulates MOSFET conduction for voltage/current control. |
| SNS | Current Sense Input | Monitors VCC–VSNS differential; initiates overcurrent protection when ΔV ≥ 50mV. |
| VCC | Positive Supply Voltage Input | Accepts 4–80V input; survives –60V reverse bias; powers all internal circuitry. |
| TMR | Fault Timer Input | Capacitor-connected node; charged by VDS-scaled current to set warning (1.25V) and latch-off (1.35V) thresholds. |
| GND | Device Ground | Reference for all analog blocks; exposed pad may be connected to PCB ground for thermal relief. |
| EN | Open-Collector Enable Output | Signals MOSFET fully on (high-Z) or off (pulled low); latched until OUT resets below 0.5V then rises above 2V. |
| FLT | Open-Collector Fault Output | Pulls low at TMR = 1.25V to warn of impending shutdown; sinks up to 3mA from 80V. |
| SHDN | Shutdown Control Input | TTL-compatible input; pulls part into <7µA mode; withstands –60V to 100V; requires >10V/ms slew rate for restart. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range with Reverse Protection | Operates 4–80V and survives –60V reverse input on VCC/SNS/SHDN-enables single-device reverse-battery and surge hardening. |
| VDS-Scaled Fault Timer | TMR current scales with VCC–VOUT, shortening timeout under high stress-prevents MOSFET SOA violation during sustained overvoltage/overcurrent. |
| Dual Independent Protection Loops | Separate voltage servo (FB) and current limiter (SNS) allow simultaneous regulation of output voltage and load current without interaction. |
| Extended Temperature Grade (MP) | –55°C to +125°C operation with full parameter guarantees-meets MIL-STD-883 and avionic environmental requirements. |
| Auxiliary Amplifier (AOUT/IN+) | Open-collector AOUT sinks 2mA at 80V; IN+ referenced to 1.25V-supports level detection, PNP linear regulator control, or fault monitoring. |
Applications
| Aerospace Power Distribution | Automotive Load Dump Protection |
|---|---|
|
Use Scenario: Protecting flight-critical avionics (e.g., inertial navigation units) from 100V+ transients during generator switching or lightning-induced surges. IC Role / Device Role / Timing Role: Acts as primary overvoltage regulator and current limiter, controlling external N-MOSFET to clamp output to 27V while maintaining uninterrupted operation. Use Value: Enables continuous system uptime during 200ms load-dump events per DO-160 Section 22, leveraging –55°C to 125°C MP grade reliability. |
Use Scenario: Safeguarding infotainment ECUs against 80V/100ms load dump transients in 12V/24V vehicle architectures. IC Role / Device Role / Timing Role: Regulates output voltage using FB feedback loop and initiates early-warning FLT signal at 1.25V TMR threshold before MOSFET shutdown. Use Value: Provides 100ms+ ride-through capability with programmable warning time (e.g., 20ms/µF), allowing ECU firmware to save state prior to power loss. |
| Industrial Hot-Swap Systems | Military Battery Management |
|
Use Scenario: Enabling live insertion of 48V backplane cards without bus disruption or arcing damage. IC Role / Device Role / Timing Role: Controls series N-MOSFET gate to limit inrush current and suppress voltage spikes during plug-in; SHDN enables controlled enable/disable sequencing. Use Value: Eliminates need for discrete TVS + current-limiting circuits-reduces BOM count and improves transient response vs. passive solutions. |
Use Scenario: Protecting tactical radios and SATCOM terminals powered from 28V aircraft batteries subject to reverse polarity and cold-crank dips. IC Role / Device Role / Timing Role: Provides reverse-input tolerance (–60V), cold-crank operation (down to 4V), and latch-off fault recovery via SHDN pulse. Use Value: Meets MIL-STD-704F voltage sag/spike requirements while supporting –55°C startup and 125°C sustained operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356HMS-3#TRPBF | Same MSOP-10 package and pinout; rated –40°C to 125°C (H grade) vs. –55°C to 125°C (MP grade). | Lacks military-grade low-temp qualification; suitable for commercial/industrial automotive but not avionic cold-start. | Select LT4356MPMS-3#TRPBF when operation below –40°C or MIL-STD compliance is required. |
| LT4356IMS-3#TRPBF | Same MSOP-10 footprint; rated –40°C to 85°C (I grade); lower max junction temperature (125°C vs. 150°C for MP). | Not qualified for extended temperature or high-reliability environments; limited to consumer/industrial use. | Choose LT4356MPMS-3#TRPBF for systems requiring guaranteed performance across full –55°C to 125°C range. |
Compared with LT4356HMS-3#TRPBF and LT4356IMS-3#TRPBF, the LT4356MPMS-3#TRPBF delivers unique –55°C startup capability, tighter parameter guarantees over temperature, and explicit qualification for aerospace/military platforms-making it the only option for mission-critical cold-environment deployment.
Availability
LT4356MPMS-3#TRPBF is available at Aetrix Electronics and suitable for aerospace power distribution, automotive load dump protection, and industrial hot-swap systems requiring stable component supply across extreme temperature ranges and long product lifecycles.
Supply support for LT4356MPMS-3#TRPBF 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 precision instrumentation, communications, and industrial markets.
The LT4356 family is designed as high-voltage surge stoppers for mission-critical power rails-specifically targeting automotive, avionic, and military systems where load continuity during transients is non-negotiable.
FAQ
What is the operating temperature range of the LT4356MPMS-3#TRPBF?
The LT4356MPMS-3#TRPBF is rated for –55°C to +125°C operation, with full electrical specifications guaranteed across this extended range. This MP grade qualification meets MIL-STD-883 and DO-160 environmental requirements, distinguishing it from commercial (C), industrial (I), and automotive (H) variants. The device's thermal design-including θJA = 160°C/W for the MSOP-10 package-supports reliable function in sealed avionic enclosures and engine-bay automotive modules.
How does the LT4356MPMS-3#TRPBF protect against overvoltage and overcurrent faults?
The LT4356MPMS-3#TRPBF employs two independent protection loops: a voltage servo amplifier monitors the FB pin to clamp output voltage (e.g., 27V during load dump), while a current-sense amplifier limits ΔVSNS to 50mV to cap load current. Both faults charge the TMR capacitor with VDS-scaled current-2–50µA for overvoltage, 4–260µA for overcurrent-triggering FLT at 1.25V and latching GATE off at 1.35V. This ensures MOSFET SOA compliance under all stress conditions.
Can the LT4356MPMS-3#TRPBF drive logic-level MOSFETs at low supply voltages?
Yes-the LT4356MPMS-3#TRPBF's GATE pin delivers ≥4.5V drive when VCC = 4V, enabling direct control of logic-level N-channel MOSFETs during cold-crank conditions (e.g., 4.5V battery). At VCC ≥ 8V, gate drive increases to 10–16V, supporting standard-threshold devices. This dual-range capability eliminates external level shifters and ensures robust turn-on across the full 4–80V input range specified for the LT4356MPMS-3#TRPBF.
What is the purpose of the auxiliary amplifier (AOUT/IN+) in the LT4356MPMS-3#TRPBF?
The auxiliary amplifier in the LT4356MPMS-3#TRPBF features IN+ referenced to an internal 1.25V bandgap and open-collector AOUT capable of sinking 2mA at 80V. It can be configured as a precision voltage comparator (e.g., monitoring backup battery voltage) or as a linear regulator controller driving an external PNP pass transistor. This dual-function block adds system-level monitoring and regulation capability without requiring additional ICs-enhancing integration in space-constrained avionic and military designs.
How is fault recovery implemented in the LT4356MPMS-3#TRPBF after latch-off?
After GATE latch-off due to TMR reaching 1.35V, the LT4356MPMS-3#TRPBF remains disabled until reset via the SHDN pin: pull SHDN low for ≥100µs, then raise it above 2.1V with a slew rate >10V/ms. During recovery, the TMR capacitor must discharge to ≤0.5V (typical discharge current = 2.2µA) and the MOSFET must thermally stabilize. This controlled reset prevents premature re-engagement during residual overvoltage/overcurrent conditions-ensuring robust fault handling in safety-critical applications.
LT4356MPMS-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Clamping:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT4356MPMS-3#TRPBF FAQ
1.How can I place an order for LT4356MPMS-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356MPMS-3#TRPBF 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 LT4356MPMS-3#TRPBF reliable?
The price and inventory of LT4356MPMS-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356MPMS-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356MPMS-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356MPMS-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356MPMS-3#TRPBF?
LT4356MPMS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356MPMS-3#TRPBF 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 LT4356MPMS-3#TRPBF?
For technical support, including LT4356MPMS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356MPMS-3#TRPBF requirements.
6.How does Aetrix verify that LT4356MPMS-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356MPMS-3#TRPBF 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 LT4356MPMS-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356MPMS-3#TRPBF?
All LT4356MPMS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356MPMS-3#TRPBF, 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 LT4356MPMS-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356MPMS-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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