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Analog Devices Inc. LT4356IMS-3#PBF
- Part No.:
- LT4356IMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356IMS-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,135
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Product details
Overview
LT4356IMS-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 fault latchoff timer and reverse input protection down to –60V, and operates across 4V–80V supply range for cold-crank robustness in vehicle power systems.
For engineers reviewing the LT4356IMS-3#PBF datasheet, LT4356IMS-3#PBF pinout, LT4356IMS-3#PBF application, or LT4356IMS-3#PBF equivalent, key selection considerations include its 10-pin MSOP package with –40°C to 85°C temperature rating, integrated auxiliary amplifier for level detection or linear regulator control, shutdown current <7µA, and AEC-Q100 qualification for automotive use.
Technical Context
The LT4356IMS-3#PBF implements dual-fault protection using independent voltage and current amplifiers: the FB-controlled voltage servo maintains 1.25V at feedback node during overvoltage, while SNS-VCC differential sensing limits current via 50mV threshold. Fault timing is dynamically scaled by VDS (VCC–OUT), delivering shorter timeout under high stress to protect MOSFET SOA.
Its GATE driver uses internal charge pump (250kHz) to deliver >10V gate drive above OUT for standard-threshold N-MOSFETs, with pull-down current of 150mA (OV) or 10mA (OC) to ensure rapid turn-off. The SHDN pin tolerates –60V to 100V and enables <7µA quiescent operation with TTL-compatible logic thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V - supports cold-crank operation and withstands automotive load dump transients. |
| Overvoltage Clamp | Adjustable via FB divider - regulates output to safe level (e.g., 27V) during surges without load interruption. |
| Current Limit Threshold | 50mV across sense resistor - sets precise overcurrent trip point independent of supply voltage. |
| Fault Timer Scaling | VDS-dependent current source - charges TMR capacitor faster under higher VDS, enforcing MOSFET SOA compliance. |
| Shutdown Current | <7µA - enables ultra-low-power system standby with full functionality disabled. |
| Auxiliary Amplifier | Open-collector AOUT + IN+ input - configurable as comparator (1.25V reference) or PNP linear regulator controller. |
| Reverse Input Rating | –60V on VCC/SHDN/SNS - enables reverse-battery protection without external diodes. |
Pinout & Package
LT4356IMS-3#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm), thermally rated to θJA = 160°C/W, with operating junction temperature up to 125°C. Pin 1 is FB; pin 10 is SHDN. 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 output clamp setting. |
| OUT | MOSFET source sense node | Senses VDS for fault timer scaling and EN status latching (goes high-Z when MOSFET fully on). |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output clamped to 10–16V above OUT; delivers 150mA pull-down for OV fault. |
| SNS | Current sense input | Monitors VCC–VSNS; internal amplifier holds differential at 50mV during overcurrent events. |
| VCC | Main supply input | Accepts 4–80V; survives –60V reverse bias; powers all internal blocks including auxiliary amplifier. |
| TMR | Fault timer capacitor connection | Capacitor to GND sets warning (1.25V) and latchoff (1.35V) thresholds; current scales with VDS. |
| FLT | Open-collector fault indicator | Pulls low at 1.25V on TMR - signals impending power-down; sinks up to 3mA from 80V. |
| EN | Open-collector enable output | High-Z when MOSFET fully on (VOUT > VCC–0.7V); latched until reset by VOUT cycling. |
| SHDN | Shutdown control input | TTL-compatible; pulls device into <7µA mode; withstands –60V to 100V; requires >10V/ms slew to restart. |
| GND | Device ground reference | Common return for all analog and digital functions; no exposed pad in MSOP package. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer | VDS-scaled current source ensures MOSFET remains within Safe Operating Area during both OV and OC faults. |
| Integrated auxiliary amplifier | IN+/AOUT pair with 1.25V internal reference enables voltage monitoring or PNP-based linear regulation without external op-amp. |
| Reverse input protection | VCC, SHDN, and SNS pins rated to –60V - eliminates need for series Schottky diode in battery-reversal scenarios. |
| Automotive-grade reliability | AEC-Q100 qualified (Grade I: –40°C to +85°C); validated for harsh automotive environments including load dump. |
| Low-power shutdown | 7µA max shutdown current with full functional disable - critical for always-on vehicle subsystems. |
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 sustaining load operation; fault timer scales with VDS to prevent MOSFET thermal runaway. Use Value: Enables uninterrupted system function during transient surges, eliminating brownouts and data corruption in safety-critical modules. |
Use Scenario: Safely inserting powered circuit cards into live backplanes in industrial PLCs or telecom shelves. IC Role / Device Role / Timing Role: High-side switch controlling inrush current and blocking reverse current; SHDN enables controlled power sequencing. Use Value: Prevents arcing and bus voltage sag during insertion, extends connector life, and avoids damage to upstream power supplies. |
| Battery-Powered System Protection | Reverse Battery Protection |
|
Use Scenario: Securing medical portable devices against overvoltage from faulty chargers or mismatched adapters. IC Role / Device Role / Timing Role: Adjustable clamp regulator (via FB divider) limiting input to 15V; 50mV current limit prevents thermal damage during short circuits. Use Value: Eliminates need for separate OVP/OCP ICs, reducing BOM count and PCB area while maintaining fast fault response. |
Use Scenario: Preventing damage in automotive telematics units when battery terminals are accidentally reversed during service. IC Role / Device Role / Timing Role: Uses back-to-back N-MOSFETs controlled by LT4356IMS-3#PBF instead of lossy Schottky diode; leverages –60V-rated pins. Use Value: Reduces forward voltage drop from ~0.4V to <50mV, increasing available load voltage and efficiency during normal operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365CDDB#TRPBF | Lower voltage range (4.5V–34V); integrated MOSFET; no adjustable clamp or auxiliary amplifier. | Best for compact, lower-voltage systems where board space is constrained and external FET not required. | Select LTC4365 when input stays below 34V and simplicity outweighs programmability and SOA optimization. |
| TPS26631PWPR | Fixed 36V overvoltage clamp; no current sense or dynamic timer; supports 2.7A continuous current. | Suitable for USB PD or PoE-powered equipment needing basic OVP without fine-grained fault management. | Choose TPS26631 for cost-sensitive, non-automotive designs requiring fixed-threshold protection and integrated current limiting. |
Compared with LTC4365CDDB#TRPBF and TPS26631PWPR, LT4356IMS-3#PBF uniquely combines wide 4V–80V operation, VDS-adaptive fault timing, and dual OV/OC protection with user-configurable clamp voltage - making it the only option qualified for AEC-Q100 Grade I automotive load dump compliance with external MOSFET flexibility.
Availability
LT4356IMS-3#PBF is available at Aetrix Electronics and suitable for automotive ECU protection, hot-swap power distribution, and battery-powered system safeguarding requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT4356IMS-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 markets.
The LT4356 family is designed specifically for high-reliability DC power path protection in automotive and industrial systems, emphasizing survivability during extreme voltage transients and precise MOSFET SOA management.
FAQ
What is the operating temperature range for LT4356IMS-3#PBF?
The LT4356IMS-3#PBF is specified for –40°C to +85°C ambient operation (Grade I), with junction temperature rated up to 125°C. This range meets AEC-Q100 requirements for under-hood automotive applications and industrial environments where thermal stability is critical. Its MSOP package has θJA = 160°C/W, enabling reliable performance with moderate PCB copper area.
How does LT4356IMS-3#PBF implement overcurrent protection?
The LT4356IMS-3#PBF monitors the voltage difference between VCC and SNS pins, regulating the GATE output to hold ΔVSNS at 50mV - corresponding to a precise current limit set by the external sense resistor. During sustained overcurrent, a scaled current charges the TMR capacitor; FLT asserts at 1.25V, and GATE pulls low at 1.35V. The current-scaling ensures faster turn-off under high VDS, protecting MOSFET SOA.
Can LT4356IMS-3#PBF be used without an external MOSFET?
No - LT4356IMS-3#PBF is a controller-only device requiring an external N-channel MOSFET as the pass element. It provides gate drive (GATE pin), fault timing (TMR), and protection logic but contains no power switching device. Using it without an external MOSFET leaves the power path open and defeats all protection functions. The datasheet specifies RDS(ON), V(BR)DSS, and SOA requirements for proper MOSFET selection.
What is the purpose of the auxiliary amplifier in LT4356IMS-3#PBF?
The auxiliary amplifier (IN+/AOUT) in LT4356IMS-3#PBF features an internal 1.25V reference and open-collector output capable of sinking 2mA. It can be configured as a voltage detection comparator (e.g., battery undervoltage alert) or as a linear regulator controller driving an external PNP transistor - adding system-level monitoring or auxiliary rail generation without requiring a separate op-amp or supervisor IC.
How is the fault timer capacitor value selected for LT4356IMS-3#PBF?
The TMR capacitor value is selected based on required warning time (tWARNING = CTMR × 100mV / 5µA ≈ 20ms/µF for OV) and total fault timeout. For example, a 6.8µF capacitor yields ~136ms warning before GATE turn-off during overvoltage. Designers must verify MOSFET SOA under worst-case VDS/ID conditions using the VDS-scaled timer current curves in the datasheet's Typical Performance Characteristics.
LT4356IMS-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
LT4356IMS-3#PBF FAQ
1.How can I place an order for LT4356IMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356IMS-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 LT4356IMS-3#PBF reliable?
The price and inventory of LT4356IMS-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 LT4356IMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356IMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356IMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356IMS-3#PBF?
LT4356IMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356IMS-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 LT4356IMS-3#PBF?
For technical support, including LT4356IMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356IMS-3#PBF requirements.
6.How does Aetrix verify that LT4356IMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356IMS-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 LT4356IMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356IMS-3#PBF?
All LT4356IMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356IMS-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 LT4356IMS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356IMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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