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Analog Devices Inc. LT4356CMS-3#TRPBF
- Part No.:
- LT4356CMS-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356CMS-3#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 10-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,815
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Product details
Overview
LT4356CMS-3#TRPBF from Analog Devices is a surge protection controller IC that regulates output voltage during automotive load dump or other high-voltage transients by driving an external N-channel MOSFET. It features adjustable overvoltage clamping (via FB pin), 50mV overcurrent sensing at SNS, fault latching with timer-based shutdown, and reverse input protection to –60V. It operates from 4V to 80V and supports hot-swap applications in battery-powered systems.
For engineers reviewing the LT4356CMS-3#TRPBF datasheet, LT4356CMS-3#TRPBF pinout, LT4356CMS-3#TRPBF application, or LT4356CMS-3#TRPBF equivalent, this page delivers verified specifications, package mapping to 10-pin MSOP, validated pin functions, real-world timing behavior under overvoltage/overcurrent faults, and two confirmed alternative parts with documented functional differences.
Technical Context
The LT4356CMS-3#TRPBF implements dual-fault protection using independent voltage and current amplifiers: the FB-controlled voltage servo maintains 1.25V at feedback node during overvoltage, while the SNS–VCC differential amplifier limits sense voltage to 50mV during overcurrent. Both faults trigger a TMR pin current source whose magnitude scales with VDS (VCC–OUT), enabling adaptive fault timing aligned with MOSFET safe operating area (SOA).
Fault response includes early warning (FLT low at VTMR = 1.25V) followed by latchoff (GATE pulled low at VTMR = 1.35V). The SHDN pin provides system-level reset control with TTL-compatible thresholds, –60V to 100V tolerance, and <7µA shutdown quiescent current. An auxiliary amplifier (IN+, AOUT) supports level detection or linear regulator control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V - enables operation during automotive cold crank (≥4V) and withstands 80V load dump transients. |
| Overvoltage Clamp | Adjustable via FB divider - regulates output to safe level (e.g., 27V) while maintaining load power during transient. |
| Overcurrent Threshold | 50mV across sense resistor - sets precise current limit without external gain stages; supports scalable protection. |
| Fault Timer Current | 2µA to 260µA (VDS-dependent) - dynamically shortens fault timeout under high stress, preserving MOSFET SOA. |
| Shutdown Current | <7µA - reduces system standby power for always-on automotive modules. |
| Reverse Input Rating | –60V on VCC and SHDN - allows direct connection in reverse-battery fault scenarios without external diode. |
| Auxiliary Amplifier | 1.25V internal reference, open-collector AOUT - drives LEDs or PNP pass transistors for secondary regulation or monitoring. |
Pinout & Package
LT4356CMS-3#TRPBF is housed in a 10-lead plastic MSOP package (3mm × 3mm), RoHS-compliant, with exposed pad optional for thermal enhancement. Pin 1 is marked by dot; top view orientation matches datasheet DE/MS/S package diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage regulator feedback input | Connects to resistive divider from OUT to GND; servoed to 1.25V during overvoltage to set clamp voltage. |
| OUT | Output voltage sense input | Senses MOSFET source voltage; used for EN latching and TMR charging current scaling. |
| GATE | N-channel MOSFET gate driver output | Charge-pump-driven output clamped to 10–16V above OUT; controls MOSFET conduction state. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; triggers overcurrent protection when ΔVSNS ≥ 50mV. |
| VCC | Main supply input | Accepts 4V–80V; withstands –60V reverse bias; powers all internal blocks including charge pump. |
| TMR | Fault timer capacitor connection | Capacitor to GND sets warning (1.25V) and latchoff (1.35V) delays; current scales with VDS. |
| GND | Device ground reference | Common return for analog and power sections; exposed pad may be connected here for thermal relief. |
| EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until VOUT resets. |
| FLT | Open-collector fault indicator | Pulls low at VTMR = 1.25V to signal impending shutdown; sinks up to 3mA from 80V. |
| SHDN | Shutdown control input | TTL-compatible; pulls device into <7µA mode; withstands –60V to 100V; requires >10V/ms slew to restart. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timing | TMR current scales with VDS, shortening timeout under high-stress conditions to prevent MOSFET SOA violation. |
| Integrated auxiliary amplifier | IN+/AOUT pair with 1.25V reference enables standalone voltage monitoring or PNP-based linear regulation without extra op-amps. |
| Reverse input protection | VCC and SHDN tolerate –60V, eliminating need for external series diode in battery-reversal-prone systems. |
| Latchoff with controlled reset | GATE remains off after fault until SHDN is pulsed low ≥100µs then raised >10V/ms - prevents uncontrolled re-engagement. |
| Wide temperature grade | LT4356CMS-3#TRPBF is rated 0°C to 70°C - suitable for commercial and non-critical industrial environments. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Sequencing |
|---|---|
|
Use Scenario: Protecting infotainment ECUs during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: LT4356CMS-3#TRPBF acts as active overvoltage regulator, clamping output to 27V while sustaining load power via external MOSFET. Use Value: Enables uninterrupted operation during transients instead of hard shutdown, meeting OEM functional safety expectations. |
Use Scenario: Inserting powered circuit cards into live backplanes without causing bus glitches or damaging connectors. IC Role / Device Role / Timing Role: LT4356CMS-3#TRPBF controls inrush current via soft-start MOSFET gate ramp and detects overcurrent during insertion. Use Value: Prevents voltage droop and arcing by limiting peak inrush to safe levels defined by sense resistor and 50mV threshold. |
| High-Side Battery Switch | Industrial Power Rail Guardian |
|
Use Scenario: Isolating 24V battery backup from main supply in programmable logic controllers during brownout or fault. IC Role / Device Role / Timing Role: LT4356CMS-3#TRPBF serves as intelligent high-side switch with reverse polarity immunity and fault latching. Use Value: Withstands –60V reverse input and shuts down cleanly on overcurrent, avoiding latchup or thermal runaway. |
Use Scenario: Securing 48V DC distribution rails in factory automation equipment against surges from motor commutation or relay switching. IC Role / Device Role / Timing Role: LT4356CMS-3#TRPBF monitors rail voltage and current, initiating graceful shutdown before downstream ICs are damaged. Use Value: Fault timer adapts to VDS, ensuring faster cutoff during high-energy events - critical for protecting expensive I/O modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#TRPBF | Fixed 28.5V overvoltage threshold; no adjustable FB clamp; integrated MOSFET driver only (no external FET control). | Best for simpler, cost-sensitive designs where fixed clamp suffices and discrete MOSFET optimization isn't required. | Select LTC4365IMS-2#TRPBF if board space is constrained and adjustable clamping isn't needed - eliminates FB divider components. |
| TPS26631RGER | Integrated 80V N-channel MOSFET; fixed 32V OV threshold; no auxiliary amplifier; lower quiescent current (1.5µA). | Suitable for compact, self-contained hot-swap modules where integration outweighs flexibility in fault response tuning. | Choose TPS26631RGER when minimizing BOM count and layout complexity is prioritized over adaptive timing or dual-fault diagnostics. |
Compared with LTC4365IMS-2#TRPBF and TPS26631RGER, the LT4356CMS-3#TRPBF offers field-adjustable overvoltage clamping, VDS-adaptive fault timing, and an auxiliary amplifier - making it uniquely suited for automotive and industrial systems requiring configurable protection and secondary monitoring capability.
Availability
LT4356CMS-3#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, hot-swap power sequencing, and high-side battery switch applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT4356CMS-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 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 was designed specifically for robust, adaptive overvoltage and overcurrent protection in harsh environments - emphasizing MOSFET SOA preservation, reverse polarity resilience, and system-level fault signaling.
FAQ
What is the function of the TMR pin on the LT4356CMS-3#TRPBF?
The TMR pin on the LT4356CMS-3#TRPBF connects to an external capacitor that sets both the early warning interval (FLT assertion at 1.25V) and full fault latchoff time (GATE disable at 1.35V). Its charging current scales with VDS (VCC–OUT), ensuring shorter timeouts under higher MOSFET stress - a key design feature of the LT4356CMS-3#TRPBF for SOA compliance.
Can the LT4356CMS-3#TRPBF drive logic-level MOSFETs at low supply voltages?
Yes - the LT4356CMS-3#TRPBF guarantees GATE drive of ≥4.5V when VCC ≥4V, enabling use of logic-level N-channel MOSFETs in cold-crank automotive systems. At VCC ≥8V, GATE drive rises to 10–16V, supporting standard-threshold devices. This dual-range capability is explicitly specified in the LT4356CMS-3#TRPBF datasheet.
How does the LT4356CMS-3#TRPBF handle reverse battery conditions?
The LT4356CMS-3#TRPBF tolerates –60V on both VCC and SHDN pins without damage, allowing direct connection in reverse-battery scenarios. No external Schottky diode is needed - back-to-back MOSFETs can be used for efficient reverse protection, reducing voltage drop and power loss compared to diode solutions.
What is the role of the auxiliary amplifier in the LT4356CMS-3#TRPBF?
The auxiliary amplifier (IN+, AOUT) in the LT4356CMS-3#TRPBF features a fixed 1.25V internal reference and open-collector output capable of sinking 2mA. It can be configured as a voltage detection comparator or linear regulator controller - adding system-level monitoring or auxiliary regulation without requiring an external op-amp.
How is the LT4356CMS-3#TRPBF reset after a fault latchoff event?
After latchoff, the LT4356CMS-3#TRPBF requires a deliberate SHDN pulse: pull SHDN ≤0.4V for ≥100µs, then raise it >2.1V with slew rate >10V/ms. This ensures reliable reset without spurious re-engagement. The TMR pin must discharge to ~0.5V first (typical 2.2µA sink), which takes milliseconds depending on CTMR value.
LT4356CMS-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:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
LT4356CMS-3#TRPBF FAQ
1.How can I place an order for LT4356CMS-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CMS-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 LT4356CMS-3#TRPBF reliable?
The price and inventory of LT4356CMS-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 LT4356CMS-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356CMS-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CMS-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CMS-3#TRPBF?
LT4356CMS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CMS-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 LT4356CMS-3#TRPBF?
For technical support, including LT4356CMS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CMS-3#TRPBF requirements.
6.How does Aetrix verify that LT4356CMS-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356CMS-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 LT4356CMS-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356CMS-3#TRPBF?
All LT4356CMS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CMS-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 LT4356CMS-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356CMS-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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