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Analog Devices Inc. LT4356CS-3#TRPBF
- Part No.:
- LT4356CS-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356CS-3#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,499
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Product details
Overview
LT4356CS-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 LT4356CS-3#TRPBF datasheet, LT4356CS-3#TRPBF pinout, LT4356CS-3#TRPBF application, or LT4356CS-3#TRPBF equivalent, key selection criteria include its 16-pin SO package, AEC-Q100 qualification for automotive use, 7µA shutdown current, 1.25V FB reference, and TMR-based adaptive fault timing dependent on VDS.
Technical Context
The LT4356CS-3#TRPBF implements dual-fault protection: overvoltage regulation via a servo-controlled GATE pin maintaining 1.25V at FB, and overcurrent limiting by clamping ΔVSNS = VCC – VSNS to 50mV. Fault detection triggers a programmable timer (TMR pin) whose charging current scales with VDS, enabling SOA-optimized MOSFET stress management.
It integrates an auxiliary amplifier (AOUT/IN+) referenced to 1.25V for level detection or linear regulator control, and a shutdown input (SHDN) tolerant from –60V to 100V. The EN pin provides open-collector enable indication, while FLT delivers early warning (1.25V TMR threshold) before latchoff (1.35V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V - enables operation during cold crank (≥4V) and withstands 80V load dump transients. |
| Overvoltage Clamp | Adjustable via FB divider - regulates output to safe level (e.g., 27V) using internal 1.25V reference. |
| Overcurrent Threshold | 50mV sense voltage - limits current through external sense resistor; ΔVSNS = VCC – VSNS. |
| Fault Timer Current | 2µA to 260µA (OV/OC) - scales with VDS to match MOSFET SOA, not fixed-time delay. |
| Shutdown Current | <7µA - ultra-low quiescent draw when SHDN pulled low, critical for always-on automotive modules. |
| Reverse Input Rating | –60V - supports reverse-battery protection without external diode, reducing voltage drop and power loss. |
| Package | 16-Lead Plastic SO - industry-standard footprint with θJA = 100°C/W, rated for 0°C to 70°C ambient. |
Pinout & Package
LT4356CS-3#TRPBF is housed in a 16-lead plastic SO package (SO-16), with exposed pad optional for thermal enhancement. Pin functions are validated per Analog Devices Rev F datasheet (p.2, top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor node | Charged by current scaling with VDS; 1.25V = FLT assert, 1.35V = GATE latchoff. |
| FB | Voltage regulation feedback | Connected to resistive divider; internal 1.25V reference sets clamp voltage (e.g., 27V). | NC | No connect | Two unconnected pins (pins 3 and 6) - must remain floating per datasheet. |
| OUT | MOSFET source sense | Senses VOUT to enable EN assertion and set TMR current baseline. |
| GATE | N-MOSFET gate driver | Charge-pump driven; clamped to +14V above OUT; pulls low at fault latchoff. |
| SNS | Current sense input | Monitors VCC – VSNS; internal amp holds ΔV = 50mV during overcurrent. |
| VCC | Main supply input | 4V–80V operating range; withstands –60V reverse bias without damage. |
| IN+ | Auxiliary amp non-inverting input | Configurable as comparator or PNP regulator controller; clamped to 7V max. |
| AOUT | Auxiliary amp output | Open-collector; sinks up to 2mA from 80V - drives LED/optocoupler directly. |
| GND | Device ground reference | Common return for all analog and power paths; exposed pad may connect here. |
| EN | Enable status indicator | Open-collector; high-Z when MOSFET fully on (VOUT > VCC – 0.7V); latched until reset. |
| FLT | Fault warning output | Open-collector; pulls low at TMR = 1.25V to signal impending shutdown. |
| SHDN | Shutdown control | TTL-compatible input; –60V to 100V tolerant; pulls device into <7µA mode. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timing | TMR current scales with VDS (2–260µA), dynamically matching MOSFET SOA instead of fixed timeout. |
| Reverse input protection | Withstands –60V at VCC/SNS/SHDN - enables back-to-back N-FET configuration replacing Schottky diode. |
| Integrated auxiliary amplifier | 1.25V-referenced op-amp (IN+/AOUT) - usable as precision comparator or linear regulator controller. |
| Latchoff with manual reset | GATE remains off after fault until SHDN pulsed low ≥100µs then raised >10V/ms - prevents auto-retry during persistent fault. |
| AEC-Q100 qualified | Rated for 0°C to 70°C (C-grade) - meets automotive reliability requirements for under-hood and infotainment systems. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Sequencing |
|---|---|
|
Use Scenario: 12V vehicle electrical system subjected to ISO 7637-2 load dump (60–80V, 200ms decay). IC Role / Device Role / Timing Role: LT4356CS-3#TRPBF regulates output to 27V via FB divider while controlling external N-FET gate; TMR capacitor sets 100ms total fault window. Use Value: Enables downstream ECUs (e.g., ADAS sensors) to remain powered and functional during transient, avoiding brownout resets. |
Use Scenario: Insertion of a peripheral board into a live 24V industrial backplane with no interruption to host system. IC Role / Device Role / Timing Role: LT4356CS-3#TRPBF acts as high-side switch; SHDN controls soft-start, EN confirms MOSFET turn-on, FLT warns of inrush overcurrent. Use Value: Prevents bus voltage sag and arcing during insertion; 50mV current limit ensures controlled charge of board capacitance. |
| Battery-Powered System High-Side Switch | Reverse Polarity Protected Power Supply |
|
Use Scenario: 48V telecom shelf with redundant battery backup requiring fault-isolated load switching. IC Role / Device Role / Timing Role: LT4356CS-3#TRPBF drives N-FET as high-side switch; FB pin disabled (tied to GND); overcurrent protection active via SNS. Use Value: Provides single-point fault isolation with <7µA shutdown current - extends battery life during standby. |
Use Scenario: Industrial PLC I/O module powered from unregulated 24V DC supply prone to accidental reverse connection. IC Role / Device Role / Timing Role: LT4356CS-3#TRPBF enables back-to-back N-FET configuration; SHDN and SNS monitor reverse conduction and overcurrent. Use Value: Eliminates 0.3–0.5V Schottky forward drop - increases available rail voltage to 23.7V+ and reduces heat generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365CDDB#TRMPBF | Lower voltage range (4.5V–40V); integrated MOSFET; no adjustable OV clamp or TMR-based SOA timing. | Best for compact 12V/24V systems where space limits external FET use; lacks automotive 80V surge rating. | Select LTC4365 if board area is constrained and 40V max input suffices; avoid for 80V load dump compliance. |
| TPS26631PWPR | Fixed 28V OV clamp; no auxiliary amplifier; 65V absolute max; no reverse-input tolerance. | Targeted at industrial 24V PoE/PSE applications; lacks –60V reverse rating and AEC-Q100 qualification. | Choose TPS26631 for cost-sensitive non-automotive designs needing simple 28V clamping without SOA optimization. |
Compared with LTC4365CDDB#TRMPBF and TPS26631PWPR, the LT4356CS-3#TRPBF uniquely combines 80V surge handling, –60V reverse tolerance, AEC-Q100 qualification, and VDS-adaptive fault timing - making it the only option for robust automotive load dump protection with external MOSFET flexibility.
Availability
LT4356CS-3#TRPBF is available at Aetrix Electronics and suitable for automotive ECU protection, industrial hot-swap subsystems, and battery-backed telecom power distribution requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT4356CS-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 automotive, industrial, communications, and healthcare markets.
The LT4356 family is designed as a programmable surge stopper for mission-critical power rails - specifically targeting automotive load dump, reverse battery, and hot-swap protection where MOSFET SOA optimization and latchoff behavior are essential.
FAQ
What is the maximum input voltage the LT4356CS-3#TRPBF can withstand during a surge event?
The LT4356CS-3#TRPBF operates continuously from 4V to 80V and is rated to withstand 80V transients such as automotive load dump. Its absolute maximum VCC rating is 80V, and it tolerates reverse input down to –60V without damage - confirmed in Absolute Maximum Ratings (Rev F, p.2). This makes LT4356CS-3#TRPBF suitable for 12V and 24V automotive systems meeting ISO 7637-2 pulse 5a/b requirements.
How does the LT4356CS-3#TRPBF implement overvoltage clamping, and is the clamp voltage adjustable?
The LT4356CS-3#TRPBF uses its FB pin to servo the GATE drive and maintain a precise 1.25V reference at the feedback node. By connecting a resistive divider from OUT to GND, the output clamp voltage is set to VCLAMP = 1.25V × (1 + R1/R2). This adjustment is fully supported in the LT4356CS-3#TRPBF datasheet (p.1, Typical Application) and enables user-defined clamping (e.g., 27V), unlike fixed-threshold alternatives.
What is the function of the TMR pin, and how does it affect fault response time?
The TMR pin on the LT4356CS-3#TRPBF sets both early warning (FLT assert) and final latchoff timing via an external capacitor. Its charging current scales with VDS - from 2µA (low stress) to 260µA (high stress) - ensuring faster shutdown under severe overcurrent. For example, a 6.8µF capacitor yields ~100ms total fault window during 80V/500mA surge (p.1, TA01b), directly optimizing MOSFET SOA.
Can the LT4356CS-3#TRPBF be used with reverse polarity input protection, and how is it implemented?
Yes - the LT4356CS-3#TRPBF supports reverse input protection to –60V at VCC, SNS, and SHDN pins. It enables back-to-back N-channel MOSFETs (instead of a Schottky diode) between input and GATE, eliminating forward voltage drop and power loss. This configuration is explicitly described in the Features list (p.1) and Applications section (p.9) of the LT4356CS-3#TRPBF datasheet.
Does the LT4356CS-3#TRPBF have automotive qualification, and what temperature grade does the CS variant support?
Yes, the LT4356CS-3#TRPBF is AEC-Q100 qualified for automotive applications. As indicated in the Order Information table (p.2), the "CS" suffix denotes the 16-lead SO package with 0°C to 70°C operating temperature range - designated LT4356CS-3#TRPBF. This grade is certified for cabin and non-under-hood automotive use, with full reliability testing per AEC-Q100 Rev G.
LT4356CS-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 16-SO
LT4356CS-3#TRPBF FAQ
1.How can I place an order for LT4356CS-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CS-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 LT4356CS-3#TRPBF reliable?
The price and inventory of LT4356CS-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 LT4356CS-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356CS-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CS-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CS-3#TRPBF?
LT4356CS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CS-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 LT4356CS-3#TRPBF?
For technical support, including LT4356CS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CS-3#TRPBF requirements.
6.How does Aetrix verify that LT4356CS-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356CS-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 LT4356CS-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356CS-3#TRPBF?
All LT4356CS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CS-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 LT4356CS-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356CS-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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