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Analog Devices Inc. LT4356HS-3#PBF
- Part No.:
- LT4356HS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356HS-3#PBF.pdf
- Description:
- IC REG OVP W/LATCHOFF 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:627
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Product details
Overview
LT4356HS-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 gate control. It operates from 4V to 80V, features adjustable 1.25V FB threshold, 50mV overcurrent sense threshold, and latched fault shutdown with TMR-based timing. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356HS-3#PBF datasheet, LT4356HS-3#PBF pinout, LT4356HS-3#PBF application, or LT4356HS-3#PBF equivalent, key selection criteria include its –40°C to 125°C AEC-Q100 qualified SO-16 package, 7µA shutdown current, reverse input protection to –60V, adjustable latchoff timer, and auxiliary amplifier for level detection or linear regulator control.
Technical Context
The LT4356HS-3#PBF implements dual independent protection loops: an overvoltage regulation loop using a voltage amplifier servoing the FB pin to 1.25V, and an overcurrent loop limiting ΔVSNS to 50mV. Both faults charge the TMR capacitor with voltage-dependent current - 2–50µA for overvoltage, 4–260µA for overcurrent - enabling adaptive MOSFET safe operating area (SOA) management.
Its GATE driver delivers up to 150mA pull-down current during overvoltage fault and 10mA during overcurrent fault, with clamped gate voltage (10–16V above OUT). The SHDN pin tolerates –60V to 100V and enables <7µA quiescent operation, while the auxiliary amplifier (AOUT/IN+) provides 1.25V-referenced comparator or PNP linear regulator control capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4V to 80V - supports cold-crank automotive operation and high-voltage industrial rails. |
| Overvoltage Clamp Threshold | FB = 1.25V ±25mV - sets regulated output voltage via external resistive divider. |
| Overcurrent Sense Threshold | ΔVSNS = 42.5mV to 57mV - limits current through external sense resistor with temperature-stable accuracy. |
| Shutdown Current | 7µA max at –40°C to 125°C - enables ultra-low-power system standby. |
| Reverse Input Rating | –60V on VCC, SNS, SHDN - allows robust reverse-battery protection without external diodes. |
| TMR Fault Timing | Voltage-dependent current source (2–260µA) - dynamically scales fault timeout based on MOSFET VDS to enforce SOA compliance. |
| AEC-Q100 Grade | Grade H (–40°C to 125°C) - qualified for under-hood automotive applications. |
Pinout & Package
LT4356HS-3#PBF is housed in a 16-lead plastic SO package (S package), with exposed pad optional for thermal enhancement. Pin 13 is NC; pins 3, 7, 11, and 14 are NC. GND (Pin 8) serves as device ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Positive input of auxiliary amplifier | Configurable as comparator input or linear regulator controller; clamped to 7V. |
| AOUT | Auxiliary amplifier output | Open-collector output sinking up to 2mA from 80V; drives LEDs or optocouplers. |
| GND | Device ground reference | Common return for all internal circuits and external sense resistor. |
| EN | Enable status indicator | Open-collector output latched high-Z when MOSFET is fully on (VOUT > VCC – 0.7V). |
| FLT | Fault warning output | Pulls low at VTMR = 1.25V to signal impending shutdown; sinks up to 3mA from 80V. |
| SHDN | Shutdown control input | TTL-compatible input; pulls part into <7µA mode; withstands –60V to 100V. |
| TMR | Fault timer capacitor connection | Current-charged node setting early warning (100mV) and latchoff (1.35V) thresholds. |
| FB | Output voltage feedback input | Servo point for overvoltage regulation; internally referenced to 1.25V. |
| OUT | MOSFET source voltage sense | Senses VDS across external N-MOSFET; triggers EN and sets TMR charging current. |
| GATE | N-MOSFET gate drive output | Charge-pump-driven output clamped 10–16V above OUT; delivers 150mA pull-down for OV fault. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; controls current limit loop to maintain 50mV. |
| VCC | Main supply input | 4V–80V operating range; supports reverse-battery tolerance down to –60V. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timer | TMR current scales with VDS (2–260µA), ensuring MOSFET stays within SOA during both OV and OC faults. |
| Integrated auxiliary amplifier | 1.25V-referenced op-amp (IN+/AOUT) usable as comparator or linear regulator controller for PNP pass devices. |
| Robust reverse-input protection | VCC, SNS, and SHDN tolerate –60V, enabling direct reverse-battery connection without Schottky diode. |
| Latched fault shutdown | GATE remains off after timeout until SHDN is pulsed low ≥100µs then raised >2.1V with >10V/ms slew rate. |
| Wide-temperature AEC-Q100 qualification | Specified and tested from –40°C to 125°C (Grade H), meeting automotive reliability requirements. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS modules during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to safe clamp voltage while monitoring MOSFET stress via TMR-based adaptive timing. Use Value: Enables uninterrupted operation during short transients and prevents MOSFET destruction during sustained overvoltage via SOA-aware latched shutdown. |
Use Scenario: Safely inserting or removing powered circuit cards in telecom or server backplanes without disrupting upstream power rails. IC Role / Device Role / Timing Role: High-side switch controller with programmable fault timer and overcurrent limiting for controlled inrush and fault isolation. Use Value: Eliminates need for discrete protection circuitry; reduces board space and improves reliability versus mechanical hot-swap controllers. |
| Battery-Powered System High-Side Switch | Reverse Battery Protection Module |
|
Use Scenario: Enabling/disabling power to critical subsystems (e.g., GPS, telematics) in battery-backed industrial trackers. IC Role / Device Role / Timing Role: Low-quiescent (<7µA) high-side switch with shutdown-controlled enable and fault reporting via FLT/EN pins. Use Value: Extends battery life during sleep modes while retaining fast, reliable power-up sequencing and fault diagnostics. |
Use Scenario: Replacing lossy Schottky diodes in 24V/48V industrial battery inputs to reduce voltage drop and heat generation. IC Role / Device Role / Timing Role: Controller for back-to-back N-MOSFET configuration providing bidirectional blocking and low-RDS(ON) conduction. Use Value: Cuts forward voltage drop from ~0.4V to <50mV, improving efficiency and eliminating diode thermal derating constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356IS-3#PBF | Same architecture and pinout, but rated for –40°C to 85°C (Grade I) instead of –40°C to 125°C. | Not qualified for under-hood automotive use; suitable for interior modules or industrial enclosures with lower ambient temps. | Select LT4356HS-3#PBF when full AEC-Q100 Grade H operation is required; use LT4356IS-3#PBF where cost optimization is prioritized and temperature range permits. |
| LT4356HMS-3#PBF | Identical electrical specs and Grade H rating, but in 10-lead MSOP package (smaller footprint, higher θJA = 160°C/W). | Better suited for space-constrained PCBs; requires thermal design attention due to reduced thermal mass vs. SO-16. | Choose LT4356HS-3#PBF for higher power dissipation capability and legacy SO footprint compatibility; select LT4356HMS-3#PBF for compact designs with adequate heatsinking. |
Compared with LT4356IS-3#PBF and LT4356HMS-3#PBF, the LT4356HS-3#PBF uniquely combines AEC-Q100 Grade H qualification, SO-16 thermal performance (θJA = 100°C/W), and proven layout compatibility for high-reliability automotive power domains - making it the preferred choice where under-hood temperature resilience and manufacturability are non-negotiable.
Availability
LT4356HS-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, and battery-powered high-side switching requiring stable component supply across extended temperature ranges.
Supply support for LT4356HS-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 automotive, industrial, communications, and healthcare markets.
The LT4356 family is designed as precision surge stoppers for high-reliability power path protection - specifically targeting automotive-grade transient suppression, reverse polarity immunity, and adaptive MOSFET SOA management in harsh environments.
FAQ
What is the maximum allowable reverse voltage on the VCC pin of the LT4356HS-3#PBF?
The LT4356HS-3#PBF supports reverse input protection to –60V on the VCC pin, enabling direct connection to battery terminals without external diodes or protection circuitry. This rating is specified across the full –40°C to 125°C operating range and is validated per AEC-Q100 stress testing protocols. The LT4356HS-3#PBF maintains functional integrity and does not latch or degrade under this reverse bias condition.
How does the LT4356HS-3#PBF implement adaptive fault timing during overvoltage and overcurrent events?
The LT4356HS-3#PBF uses a voltage-dependent current source on the TMR pin: during overvoltage, TMR current scales from 2µA (at VDS ≤ 0.5V) to 50µA (at VDS = 75V); during overcurrent, it scales from 4µA to 260µA (at VDS = 80V). This ensures shorter fault timeouts under high-stress conditions, keeping the external MOSFET within its safe operating area. The LT4356HS-3#PBF's adaptive timing eliminates fixed-timer compromises between transient ride-through and SOA compliance.
Can the auxiliary amplifier in the LT4356HS-3#PBF be used to regulate an output voltage independently of the main surge protection function?
Yes - the LT4356HS-3#PBF's auxiliary amplifier (IN+/AOUT) has its negative input tied to an internal 1.25V reference and can drive an external PNP pass transistor to create a standalone linear regulator. Its open-collector AOUT pin sinks up to 2mA from 80V, supporting LED indicators or optocoupler interfaces. This function operates independently of the main overvoltage/overcurrent protection loops and remains active during normal operation and fault conditions unless disabled via SHDN.
What is the recommended method to reset the LT4356HS-3#PBF after a latched fault shutdown?
To reset the LT4356HS-3#PBF after GATE latches off, pull the SHDN pin low for ≥100µs, then raise it above 2.1V with a minimum slew rate of 10V/ms. This sequence clears the internal fault latch and re-enables gate drive. Do not rely on power cycling alone - the LT4356HS-3#PBF requires this specific SHDN pulse to restore functionality. Ensure the TMR capacitor discharges below 0.5V (typical discharge current 2.2µA) before attempting reset to avoid immediate re-fault.
Does the LT4356HS-3#PBF require an external gate resistor for driving the N-channel MOSFET?
No - the LT4356HS-3#PBF integrates a charge-pump gate driver capable of sourcing and sinking sufficient current (up to 150mA pull-down during overvoltage) to directly drive standard and logic-level N-channel MOSFETs without external gate resistors. However, a small series resistor (≤10Ω) may be added for EMI suppression or oscillation damping in high-dI/dt layouts. The LT4356HS-3#PBF's GATE pin is internally clamped to 10–16V above OUT, eliminating risk of gate overvoltage.
LT4356HS-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
LT4356HS-3#PBF FAQ
1.How can I place an order for LT4356HS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HS-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 LT4356HS-3#PBF reliable?
The price and inventory of LT4356HS-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 LT4356HS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356HS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HS-3#PBF?
LT4356HS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HS-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 LT4356HS-3#PBF?
For technical support, including LT4356HS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HS-3#PBF requirements.
6.How does Aetrix verify that LT4356HS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356HS-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 LT4356HS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356HS-3#PBF?
All LT4356HS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HS-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 LT4356HS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356HS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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