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Analog Devices Inc. LT4356MPMS-3#PBF
- Part No.:
- LT4356MPMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356MPMS-3#PBF.pdf
- Description:
- SURGE STOPPER SMD
- Quantity:
- Payment:
- Shipping:
Inventory:132
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Product details
Overview
LT4356MPMS-3#PBF 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 battery-powered high-side switch applications requiring robust transient immunity.
For engineers reviewing the LT4356MPMS-3#PBF datasheet, LT4356MPMS-3#PBF pinout, LT4356MPMS-3#PBF application, or LT4356MPMS-3#PBF equivalent, key selection criteria include its AEC-Q100-qualified MSOP-10 package, –60V reverse input tolerance, 7µA shutdown current, adjustable 1.25V FB reference, and inverse-proportional fault timer scaling with MOSFET stress.
Technical Context
The LT4356MPMS-3#PBF implements dual protection loops: a voltage amplifier servoing the GATE pin to maintain 1.25V at FB during overvoltage, and a current-sense amplifier limiting ΔVSNS to 50mV during overcurrent. Fault detection triggers a TMR capacitor charging current that scales linearly with VDS - up to 50µA in overvoltage and 260µA in overcurrent - ensuring MOSFET safe operating area compliance.
It integrates a shutdown input tolerant to –60V to 100V, an auxiliary amplifier with 1.25V internal reference (AOUT/IN+ pins), and open-collector FLT/EN outputs capable of sinking 3mA from 80V. The GATE driver delivers >10V gate drive above OUT for standard-threshold MOSFETs above 8V VCC, and ≥4.5V below 8V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V operation; supports cold-crank automotive conditions and withstands –60V reverse input without damage. |
| Overcurrent Threshold | Adjustable 42.5mV to 57mV ΔVSNS; sets precise current limit via external sense resistor, with 50mV typical value. |
| FB Reference Voltage | 1.215V to 1.275V; defines regulated output clamp level via external resistive divider on OUT–GND path. |
| Shutdown Current | <7µA at –55°C to 125°C; enables ultra-low-power system standby in harsh-environment battery systems. |
| Fault Timer Scaling | TMR current scales from 2µA to 50µA (OV) or 4µA to 260µA (OC) vs. VDS; dynamically adapts turn-off timing to MOSFET SOA limits. |
| Operating Temperature | –55°C to 125°C; qualified for extended industrial and military-grade embedded power rail protection. |
| GATE Drive Range | 4.5V to 16V above OUT pin; ensures reliable N-MOSFET enhancement across full VCC range including low-voltage start-up. |
Pinout & Package
LT4356MPMS-3#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm footprint, 0.5mm pitch) with exposed pad optional for thermal enhancement. Pin 1 is bottom-left corner when marking "LTFFK" is oriented upright.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Voltage regulator feedback input | Connects to center tap of resistive divider; servoed to 1.25V to set output clamp voltage during overvoltage. |
| 2 OUT | Output voltage sense input | Senses MOSFET source node; enables EN latch and sets TMR charging current based on VCC–VOUT. |
| 3 GATE | N-channel MOSFET gate drive output | Charge-pump-driven output clamped to 14V above OUT; controls MOSFET conduction state for regulation or cutoff. |
| 4 SNS | Current sense input | Monitors voltage drop across external sense resistor; initiates overcurrent protection when ΔVSNS exceeds threshold. |
| 5 VCC | Positive supply input | Primary power rail (4–80V); also withstands –60V reverse bias; powers internal circuitry and charge pump. |
| 6 TMR | Fault timer capacitor connection | Capacitor to GND sets warning (FLT assert) and latch-off (GATE disable) delays; current scales with VDS. |
| 7 GND | Device ground reference | System return path; exposed pad may be connected to PCB GND for improved thermal performance. |
| 8 EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VCC–0.7V); latched until reset by VOUT cycling. |
| 9 FLT | Open-collector fault output | Pulls low at VTMR = 1.25V to warn of impending shutdown; sinks up to 3mA from 80V for LED/opto interface. |
| 10 SHDN | Shutdown control input | TTL-compatible input; pulls device into <7µA mode; withstands –60V to 100V; requires 10V/ms slew rate for restart. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 4V to 80V operation with –60V reverse input tolerance enables use in 12V/24V/48V automotive and industrial systems. |
| Adjustable overvoltage clamp | 1.25V FB reference allows precise output regulation via external resistor divider - e.g., 27V clamp as shown in typical application. |
| Inverse-proportional fault timing | TMR current increases with VDS, shortening fault timeout under high-stress conditions to protect MOSFET SOA. |
| Integrated auxiliary amplifier | 1.25V-referenced op-amp (AOUT/IN+) supports comparator-based undervoltage detection or PNP linear regulator control. |
| Back-to-back FET reverse protection | Enables replacement of Schottky diode with two N-MOSFETs, reducing forward drop and power loss in bidirectional paths. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V while controlling external N-MOSFET gate; fault timer scales with VDS to prevent MOSFET thermal runaway. Use Value: Enables uninterrupted operation during transients; eliminates need for bulky TVS diodes and reduces board space by 40% vs. discrete clamp solutions. |
Use Scenario: Inserting powered modules into live backplane systems without causing bus glitches or damaging connectors. IC Role / Device Role / Timing Role: High-side switch with soft-start and current-limiting; EN pin signals MOSFET readiness; SHDN enables controlled insertion sequence. Use Value: Limits inrush current to <500mA; provides 100ms fault warning via FLT before disconnect, preventing data corruption during hot-swap. |
| Battery-Powered High-Side Switch | Industrial 48V DC Power Rail Protection |
|
Use Scenario: Isolating Li-ion battery packs from sensitive downstream converters in portable test equipment. IC Role / Device Role / Timing Role: Reverse-input-tolerant high-side controller; –60V SHDN rating allows direct connection to battery terminals; 7µA shutdown preserves battery life. Use Value: Eliminates need for external reverse-blocking diode; extends runtime by 12% in 24-hour standby mode vs. diode-based isolation. |
Use Scenario: Securing programmable logic controllers against 80V surges induced by inductive load switching in factory automation. IC Role / Device Role / Timing Role: Overvoltage/overcurrent protector driving 100V-rated N-MOSFET; TMR capacitor set for 200ms total fault window per IEC 61000-4-5 Level 4. Use Value: Meets EN 61000-4-5 surge immunity without external crowbar; reduces BOM count by 3 components vs. discrete SCR-based protection. |
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 | Lower 4.5V–40V range; integrated MOSFET; fixed 28.5V OV clamp; no auxiliary amplifier. | Better suited for compact 5V/12V USB-C PD or PoE-powered devices where board space is critical. | Select LTC4365IMS-3#PBF when integrated FET and smaller footprint outweigh need for adjustable clamp and reverse-input tolerance. |
| TPS26631PWPR | 4.5V–60V range; 1.2A integrated FET; fixed 32V OV clamp; no TMR scaling or auxiliary amp; automotive grade. | Targeted at 24V commercial vehicle telematics with simpler fault response and lower cost. | Choose TPS26631PWPR for cost-sensitive, non-military automotive designs where 60V max input and fixed clamp suffice. |
Compared with LTC4365IMS-3#PBF and TPS26631PWPR, LT4356MPMS-3#PBF uniquely supports –55°C operation, 80V input, –60V reverse tolerance, and scalable fault timing - making it the only option for extended-temperature 48V industrial surge protection with design flexibility.
Availability
LT4356MPMS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial 48V DC power rail hardening, and battery-powered high-side switch applications requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LT4356MPMS-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.
The LT4356 family is designed for high-voltage transient protection in mission-critical power systems, emphasizing MOSFET SOA-aware fault timing, wide input range, and AEC-Q100 qualification for automotive deployment.
FAQ
What is the maximum reverse input voltage the LT4356MPMS-3#PBF can withstand?
The LT4356MPMS-3#PBF supports reverse input voltages down to –60V on both VCC and SHDN pins without damage. This is explicitly specified in the Absolute Maximum Ratings table and validated across the full –55°C to 125°C operating range, enabling direct connection to battery terminals in reverse-polarity-prone environments.
How does the fault timer in LT4356MPMS-3#PBF adapt to different MOSFET stress levels?
The LT4356MPMS-3#PBF charges the TMR capacitor with a current that scales linearly with VDS (VCC–OUT). During overvoltage, current ranges from 2µA to 50µA; during overcurrent, it ranges from 4µA to 260µA. This ensures shorter fault timeouts under higher stress - directly protecting the MOSFET's safe operating area without fixed-time compromises.
Can the LT4356MPMS-3#PBF drive standard-threshold N-channel MOSFETs at low supply voltages?
Yes - the LT4356MPMS-3#PBF guarantees ≥4.5V gate drive above OUT when VCC ≥4V, sufficient for logic-level N-MOSFETs. At VCC ≥8V, gate drive exceeds 10V, supporting standard-threshold devices. This dual-range capability is confirmed in the Electrical Characteristics table under ΔVGATE specifications.
What is the function of the auxiliary amplifier in LT4356MPMS-3#PBF, and how is it configured?
The auxiliary amplifier in LT4356MPMS-3#PBF has its negative input tied to an internal 1.25V reference. It is accessed via AOUT (output) and IN+ (non-inverting input) pins. It can be configured as a comparator (e.g., for undervoltage lockout) or as a linear regulator controller driving an external PNP pass transistor - both uses are documented in the Applications Information section.
How is the LT4356MPMS-3#PBF reset after a fault-induced latch-off?
After GATE latch-off, the LT4356MPMS-3#PBF requires pulling SHDN below 0.4V for ≥100µs, then raising it above 2.1V with a slew rate >10V/ms. This sequence clears the internal fault latch. Simply cycling VCC or removing TMR capacitor charge is insufficient - the SHDN edge-rate requirement is mandatory and verified in the PIN FUNCTIONS description.
LT4356MPMS-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:
- Adjustable
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT4356MPMS-3#PBF FAQ
1.How can I place an order for LT4356MPMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356MPMS-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 LT4356MPMS-3#PBF reliable?
The price and inventory of LT4356MPMS-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 LT4356MPMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356MPMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356MPMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356MPMS-3#PBF?
LT4356MPMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356MPMS-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 LT4356MPMS-3#PBF?
For technical support, including LT4356MPMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356MPMS-3#PBF requirements.
6.How does Aetrix verify that LT4356MPMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356MPMS-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 LT4356MPMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356MPMS-3#PBF?
All LT4356MPMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356MPMS-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 LT4356MPMS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356MPMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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