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Analog Devices Inc. LT4356CS-3#PBF
- Part No.:
- LT4356CS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356CS-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT4356CS-3#PBF from Analog Devices is a surge protection controller IC that regulates output voltage during automotive load dump and other high-voltage transients by driving an external N-channel MOSFET. It features adjustable overvoltage clamping (via FB pin), 50mV overcurrent sensing at SNS, 1.25V internal reference, 4V–80V operating range, and AEC-Q100 qualification for automotive use in battery-powered systems.
For engineers reviewing the LT4356CS-3#PBF datasheet, LT4356CS-3#PBF pinout, LT4356CS-3#PBF application, or LT4356CS-3#PBF equivalent, key selection considerations include its fault-latching behavior, TMR-based adaptive timer scaling with VDS, reverse input tolerance to –60V, shutdown current <7µA, and SO-16 package compatibility with industrial and automotive power rail protection designs.
Technical Context
The LT4356CS-3#PBF implements dual-fault protection: overvoltage regulation via a servo-controlled GATE pin maintaining 1.25V at FB, and overcurrent limiting by holding ΔVSNS = VCC – VSNS at 50mV. Its TMR pin charges with a voltage-dependent current-2µA to 50µA during overvoltage, 4µA to 260µA during overcurrent-enabling MOSFET-safe adaptive timing.
It integrates an auxiliary amplifier (AOUT/IN+) referenced to 1.25V for level detection or linear regulator control, and supports back-to-back FET reverse polarity protection. The SHDN pin tolerates –60V to 100V and reduces quiescent current to <7µA when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - enables operation during cold-crank (4V) and withstands 80V load dump surges. |
| Overvoltage Clamp Threshold | Adjustable via FB divider - sets regulated output voltage using internal 1.25V reference. |
| Overcurrent Sense Threshold | 50mV across sense resistor - provides precise, temperature-stable current limiting independent of VCC. |
| Fault Timer Current Range | 2µA–260µA (TMR pin) - scales with VDS to match MOSFET safe operating area (SOA) during faults. |
| Shutdown Quiescent Current | <7µA - ensures minimal battery drain in always-on automotive modules. |
| Reverse Input Protection | –60V on VCC/SHDN/SNS - allows direct connection to reverse-battery or negative-surge conditions without external diodes. |
| AEC-Q100 Grade | Grade 3 (0°C to 70°C) - certified for non-critical automotive applications per LT4356CS-3#PBF ordering code. |
Pinout & Package
LT4356CS-3#PBF is housed in a 16-lead plastic SO (Small Outline) package with exposed pad optional grounding. Pin functions are electrically identical to the DFN and MSOP variants but mapped to the SO-16 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TMR | Fault timer capacitor node | Charges with VDS-scaled current; 1.25V threshold triggers FLT, 1.35V triggers GATE latch-off. |
| 2 FB | Voltage regulation feedback input | Connected to resistive divider; internal 1.25V reference enables adjustable output clamp. |
| 3 NC | No connect | Not bonded; leave unconnected per datasheet. |
| 4 OUT | MOSFET source sense input | Senses VOUT; used for EN latching and TMR current scaling. |
| 5 GATE | N-MOSFET gate driver output | Charge-pump driven; clamped to VOUT +14V; delivers up to 150mA pull-down during OV fault. |
| 6 NC | No connect | Not bonded; leave unconnected. |
| 7 SNS | Current sense input | Monitors VCC–VSNS; internal amplifier holds ΔV = 50mV during overcurrent. |
| 8 VCC | Main supply input | 4V–80V operation; withstands –60V reverse; powers all internal blocks. |
| 9 IN+ | Auxiliary amp non-inverting input | 1.25V-referenced comparator input; clamped to 7V; unused pins tied to GND. |
| 10 NC | No connect | Not bonded; leave unconnected. |
| 11 AOUT | Auxiliary amplifier output | Open-collector; sinks up to 2mA from 80V; usable as level detector or PNP base driver. |
| 12 NC | No connect | Not bonded; leave unconnected. |
| 13 GND | Device ground reference | Primary return path; exposed pad may be connected to PCB GND for thermal relief. |
| 14 EN | Enable status output | Open-collector; goes high-Z when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset. |
| 15 FLT | Fault warning output | Open-collector; pulls low at TMR = 1.25V to signal impending shutdown; sinks up to 3mA from 80V. |
| 16 SHDN | Shutdown control input | TTL-compatible; –60V to 100V tolerant; pulls internal blocks offline; <7µA IQ in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Fault Timer | TMR current scales with VDS (2–260µA), dynamically matching MOSFET SOA to prevent thermal runaway during sustained faults. |
| Reverse Input Tolerance | VCC, SHDN, and SNS pins withstand –60V - eliminates need for external reverse-battery protection diodes. |
| Latch-Off Fault Recovery | GATE remains latched off after fault timeout; requires SHDN pulse (low ≥100µs + fast rise >10V/ms) to reset - prevents uncontrolled restart. |
| Integrated Auxiliary Amplifier | AOUT/IN+ pair with 1.25V internal reference - enables voltage monitoring, hysteresis-comparator, or linear regulator control without external op-amp. |
| Back-to-Back FET Support | Enables reverse-polarity protection using two N-MOSFETs instead of Schottky diode - reduces forward drop and power loss. |
| Automotive Qualification | AEC-Q100 Grade 3 (0°C to 70°C) - validated for under-hood and infotainment power rail protection in production vehicles. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: LT4356CS-3#PBF regulates output to safe clamp voltage (e.g., 27V) while controlling external MOSFET gate; TMR capacitor sets 100ms+ fault holdoff. Use Value: Enables uninterrupted operation during transient events, avoiding system resets and preserving CAN bus state. |
Use Scenario: Safely inserting/replacing FRU (Field Replaceable Unit) boards into live 24V/48V telecom or industrial backplanes. IC Role / Device Role / Timing Role: LT4356CS-3#PBF acts as high-side switch with controlled inrush limiting and overcurrent cutoff; EN pin signals insertion readiness. Use Value: Prevents bus voltage sag and arcing during hot-plug; eliminates need for mechanical interlocks or manual power sequencing. |
| Battery-Powered System High-Side Switch | Reverse Polarity Protected Power Supply |
|
Use Scenario: Managing main battery feed to safety-critical subsystems (e.g., ADAS sensors) in EVs and HEVs. IC Role / Device Role / Timing Role: LT4356CS-3#PBF serves as programmable high-side switch with adjustable OV/OI thresholds and latch-off behavior for fail-safe shutdown. Use Value: Provides deterministic fault response (FLT assertion → GATE latch-off) meeting ISO 26262 ASIL-B functional safety requirements. |
Use Scenario: Powering industrial controllers from unregulated DC inputs where accidental reverse connection must not damage circuitry. IC Role / Device Role / Timing Role: LT4356CS-3#PBF enables back-to-back N-MOSFET configuration; SNS and SHDN tolerate –60V, eliminating Schottky losses. Use Value: Reduces forward voltage drop by >0.4V vs. diode solution, increasing available load voltage and efficiency at high currents. |
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#PBF | Fixed 28V OV clamp; no adjustable FB; lower 3.5V min VCC; integrated MOSFET driver only (no external FET control). | Best for compact, fixed-threshold protection where board space limits external FET use. | Select LTC4365IMS-2#PBF when simplicity and smaller footprint outweigh need for adjustable clamping or high-current scalability. |
| TPS26631PWPR | Integrated 80V MOSFET; fixed 32V OV clamp; no TMR adaptive timing; no auxiliary amplifier; 1.5A max continuous current. | Suitable for low-power USB-C PD or PoE-powered devices requiring single-chip hot-swap with built-in FET. | Choose TPS26631PWPR when integrated FET suffices and auxiliary functions (AOUT/IN+) are unnecessary. |
Compared with LTC4365IMS-2#PBF and TPS26631PWPR, LT4356CS-3#PBF offers field-adjustable overvoltage clamping, scalable current handling via external MOSFET selection, adaptive SOA-aware fault timing, and dual-function auxiliary amplifier - making it uniquely suited for high-reliability, high-power automotive and industrial power rail protection where design flexibility and fault resilience are critical.
Availability
LT4356CS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, hot-swap power distribution, and battery-powered high-side switching applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT4356CS-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 industrial, automotive, communications, and healthcare markets with precision power, interface, and protection solutions.
The LT4356 family is designed specifically for robust, high-voltage transient protection in automotive and industrial power systems - delivering latch-off fault response, reverse-input resilience, and MOSFET SOA optimization through adaptive timing.
FAQ
What is the maximum input voltage the LT4356CS-3#PBF can withstand without damage?
The LT4356CS-3#PBF supports continuous operation from 4V to 80V on VCC, and its VCC, SHDN, and SNS pins are rated for –60V reverse voltage. Absolute maximum rating for VCC and SHDN is –60V to 100V, meaning LT4356CS-3#PBF survives brief reverse-battery connections and high-energy load dump transients up to 80V without latch-up or permanent damage.
How does the LT4356CS-3#PBF implement adaptive fault timing?
The LT4356CS-3#PBF generates a TMR charging current that scales linearly with VDS (VCC – OUT): from 2µA at 0.5V to 50µA during overvoltage, and 4µA to 260µA during overcurrent. This ensures shorter fault timeouts at higher VDS, keeping MOSFET stress within its Safe Operating Area - a feature confirmed in LT4356CS-3#PBF's datasheet Figures 1 and 2.
Can the LT4356CS-3#PBF be used with P-channel MOSFETs?
No - the LT4356CS-3#PBF is explicitly designed to drive N-channel MOSFETs in high-side configuration. Its GATE driver is optimized for N-FET enhancement-mode operation with charge-pump boost and VOUT+14V clamping. Driving a P-FET would require inverted logic, different gate drive architecture, and is not supported by LT4356CS-3#PBF's internal control loop or pinout.
What is the purpose of the AOUT and IN+ pins on the LT4356CS-3#PBF?
AOUT and IN+ form an auxiliary operational amplifier with its inverting input internally tied to a 1.25V reference. IN+ serves as the non-inverting input; AOUT is an open-collector output sinking up to 2mA. Together, they enable LT4356CS-3#PBF to function as a voltage monitor, hysteresis comparator, or linear regulator controller - adding system-level functionality beyond basic surge protection.
How do I reset the LT4356CS-3#PBF after a fault-induced latch-off?
To reset LT4356CS-3#PBF after GATE latch-off, pull the SHDN pin low for ≥100µs, then raise it above 2.1V with a slew rate faster than 10V/ms. This sequence clears the internal fault latch and re-enables GATE drive. Simply removing input power is insufficient - the part retains latch state until this precise SHDN edge is applied, ensuring controlled recovery.
LT4356CS-3#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm 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:
- 16-SO
LT4356CS-3#PBF FAQ
1.How can I place an order for LT4356CS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CS-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 LT4356CS-3#PBF reliable?
The price and inventory of LT4356CS-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 LT4356CS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CS-3#PBF?
LT4356CS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CS-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 LT4356CS-3#PBF?
For technical support, including LT4356CS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CS-3#PBF requirements.
6.How does Aetrix verify that LT4356CS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CS-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 LT4356CS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CS-3#PBF?
All LT4356CS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CS-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 LT4356CS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356CS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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