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Analog Devices Inc. LT4356HMS-3#PBF
- Part No.:
- LT4356HMS-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356HMS-3#PBF.pdf
- Description:
- IC REG OVP W/LATCHOFF 10-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,124
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Product details
Overview
LT4356HMS-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 control. It operates from 4V to 80V input, features adjustable 1.25V FB threshold, 50mV overcurrent sense threshold, and −40°C to +125°C temperature range. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356HMS-3#PBF datasheet, LT4356HMS-3#PBF pinout, LT4356HMS-3#PBF application, or LT4356HMS-3#PBF equivalent, key selection criteria include its 10-pin MSOP package with −60V reverse-input tolerance, 7µA shutdown current, latchoff fault timer with TMR pin programmability, and auxiliary amplifier for level detection or linear regulator control.
Technical Context
The LT4356HMS-3#PBF implements dual protection loops: an overvoltage servo loop using the FB pin to maintain 1.25V at the feedback divider, and an overcurrent loop sensing ΔVSNS = VCC − VSNS with 50mV threshold. Both faults charge the TMR capacitor with voltage-dependent current-up to 50µA during overvoltage and 260µA during overcurrent-to enforce MOSFET safe operating area (SOA) compliance.
Its gate driver delivers up to 150mA pull-down and −4µA pull-up (at VCC = 12V), clamped to VOUT + 10V, enabling robust N-MOSFET control. The SHDN pin withstands −60V to +100V and reduces quiescent current to ≤7µA when asserted, while the auxiliary amplifier (AOUT/IN+) provides 1.25V-referenced comparator or PNP linear regulator functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V - supports cold-crank operation and automotive load dump immunity. |
| Overvoltage Clamp | Adjustable via FB divider; internal 1.25V reference sets regulated output voltage. |
| Overcurrent Threshold | 50mV across sense resistor - enables precise, temperature-stable current limiting. |
| Shutdown Current | ≤7µA - ensures ultra-low power loss during system standby or fault latchoff. |
| Operating Temp | −40°C to +125°C - AEC-Q100 qualified for under-hood automotive use. |
| Reverse Input Rating | −60V - allows direct connection to reversed battery without external diode. |
| SHDN Pin Range | −60V to +100V - eliminates need for level-shifting circuitry in high-side applications. |
Pinout & Package
LT4356HMS-3#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm), thermally rated at θJA = 160°C/W. The exposed pad is optional for thermal enhancement but not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| FB | Voltage Regulator Feedback Input | Sets output clamp voltage via resistive divider; internal 1.25V reference enables precise regulation. |
| OUT | Output Voltage Sense Input | Monitors source of external N-MOSFET; triggers EN pin latching and TMR charging during fault. |
| GATE | N-Channel MOSFET Gate Drive Output | Drives external MOSFET gate with 150mA pull-down; clamped to VOUT + 10V for safe turn-off. |
| SNS | Current Sense Input | Measures VCC − VSNS; initiates overcurrent protection when differential reaches 50mV. |
| VCC | Positive Supply Input | Accepts 4V–80V supply; survives −60V reverse bias - no external protection diode needed. |
| TMR | Fault Timer Input | Capacitor-connected node charged with voltage-dependent current to implement SOA-aware timing. |
| SHDN | Shutdown Control Input | TTL-compatible input; pulls device into <7µA mode and disables GATE and auxiliary amplifier. |
| FLT | Open-Collector Fault Output | Pulls low at VTMR = 1.25V (early warning); remains low until reset via SHDN toggle. |
| EN | Open-Collector Enable Output | High-impedance when MOSFET is fully on; latched until OUT resets below 0.5V then rises >2V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Latchoff Fault Timer | TMR pin accepts external capacitor to set both early-warning interval (100mV/5µA) and total fault timeout - dynamically scaled to MOSFET VDS for SOA compliance. |
| Back-to-Back FET Reverse Protection | Enables replacement of Schottky diode with two N-MOSFETs - eliminates ~0.3V forward drop and associated power loss in high-current paths. |
| Auxiliary Amplifier | 1.25V-referenced op-amp (AOUT/IN+) usable as comparator with hysteresis or linear regulator controller for PNP pass transistor - adds system-level monitoring capability. |
| Robust Input Ratings | VCC, SHDN tolerate −60V to +100V; SNS tolerates −60V to VCC+0.3V - simplifies design in harsh automotive environments with battery reversal or load dump. |
| Low-Power Shutdown | SHDN assertion reduces ICC to ≤7µA - critical for always-on vehicle modules meeting ISO 16750 quiescent current limits. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to safe clamp voltage (e.g., 27V) while controlling external N-MOSFET gate to sustain load operation. Use Value: Enables uninterrupted operation during transient events without requiring oversized downstream regulators or derated components. |
Use Scenario: Safely inserting/replacing power modules in live 24V/48V industrial PLC backplanes without disrupting bus operation. IC Role / Device Role / Timing Role: High-side switch with programmable fault timer and overcurrent limiting - prevents arc damage and bus collapse during insertion. Use Value: Eliminates need for mechanical interlocks or manual power cycling; supports IEEE 802.3af/at-like plug-and-play reliability. |
| Battery-Powered System High-Side Switch | Reverse Battery Protection Circuit |
|
Use Scenario: Controlling power to mission-critical subsystems (e.g., GPS, telemetry) in portable military radios powered by Li-ion or lead-acid batteries. IC Role / Device Role / Timing Role: High-side N-MOSFET controller with shutdown pin tolerance to −60V - enables direct battery connection without polarity protection diodes. Use Value: Reduces voltage drop and heat generation vs. Schottky solutions, extending runtime and improving thermal margin. |
Use Scenario: Preventing damage from accidental reverse battery connection in automotive telematics units and fleet management hardware. IC Role / Device Role / Timing Role: Reverse-input tolerant controller enabling back-to-back N-MOSFET configuration - blocks reverse current while maintaining low RDS(ON). Use Value: Achieves <10mΩ effective reverse path resistance vs. >300mΩ typical Schottky solution - minimizes standby power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-3#PBF | Lower max input (40V), integrated MOSFET driver only (no auxiliary amp), fixed 2.7V UVLO. | Better suited for 24V industrial systems; lacks AOUT/IN+ flexibility for custom monitoring. | Select when compact size and lower cost outweigh need for 80V rating or auxiliary functions. |
| TPS26631PWPR | Integrated 80V N-MOSFET, fixed 28V OV clamp, no TMR programmability, no auxiliary amplifier. | Reduces BOM count but sacrifices SOA-aware timing and dual-loop configurability. | Choose for simplified layout where adjustable timing and external MOSFET optimization are unnecessary. |
Compared with LTC4365IMS-3#PBF and TPS26631PWPR, LT4356HMS-3#PBF uniquely combines 80V operation, SOA-optimized TMR current scaling, and a dedicated auxiliary amplifier - making it the only option supporting both high-voltage automotive load dump protection and custom system-level monitoring in a single 10-pin MSOP.
Availability
LT4356HMS-3#PBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial hot-swap systems, and battery-powered high-side switching applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT4356HMS-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 specifically for high-reliability DC power protection in harsh environments - delivering programmable surge suppression, reverse-input tolerance, and MOSFET SOA management for automotive and industrial power systems.
FAQ
What is the maximum input voltage rating for LT4356HMS-3#PBF?
The LT4356HMS-3#PBF supports a continuous input voltage range of 4V to 80V on the VCC pin. Its absolute maximum rating extends to −60V (reverse bias), allowing direct connection to automotive batteries without external protection diodes. This rating is validated across the full −40°C to +125°C operating temperature range and is AEC-Q100 qualified for automotive use.
How does the TMR pin implement SOA-aware fault timing in LT4356HMS-3#PBF?
The TMR pin in LT4356HMS-3#PBF charges with a current proportional to VCC − OUT (i.e., MOSFET VDS): 2µA at 0.5V rising to 50µA at 75V during overvoltage, and 4µA to 260µA during overcurrent. This ensures shorter fault timeouts at higher stress levels - directly aligning with MOSFET safe operating area constraints and preventing thermal runaway.
Can LT4356HMS-3#PBF drive logic-level N-channel MOSFETs at low supply voltages?
Yes - at VCC ≥ 8V, LT4356HMS-3#PBF guarantees GATE drive of 10V to 16V above OUT, compatible with standard-threshold MOSFETs. At VCC = 4V, minimum ΔVGATE drops to 4.5V, requiring logic-level devices (e.g., IRLR2908) to ensure full enhancement and low RDS(ON) during cold-crank conditions.
What is the function of the auxiliary amplifier in LT4356HMS-3#PBF?
The auxiliary amplifier in LT4356HMS-3#PBF consists of IN+ (non-inverting input) and AOUT (open-collector output), with its inverting input tied to an internal 1.25V reference. It can be configured as a precision voltage comparator with external hysteresis or as a linear regulator controller driving an external PNP pass transistor - adding system-level monitoring or auxiliary rail generation capability.
How is LT4356HMS-3#PBF reset after a fault-induced latchoff?
After GATE turns off due to TMR timeout, LT4356HMS-3#PBF remains latched until the SHDN pin is pulled low for ≥100µs and then raised with a slew rate >10V/ms. This sequence clears the internal fault latch, re-enables gate drive, and resumes normal operation - ensuring deliberate recovery and preventing uncontrolled restart during persistent faults.
LT4356HMS-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
LT4356HMS-3#PBF FAQ
1.How can I place an order for LT4356HMS-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HMS-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 LT4356HMS-3#PBF reliable?
The price and inventory of LT4356HMS-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 LT4356HMS-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356HMS-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HMS-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HMS-3#PBF?
LT4356HMS-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HMS-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 LT4356HMS-3#PBF?
For technical support, including LT4356HMS-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HMS-3#PBF requirements.
6.How does Aetrix verify that LT4356HMS-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356HMS-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 LT4356HMS-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356HMS-3#PBF?
All LT4356HMS-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HMS-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 LT4356HMS-3#PBF part is unused and in its original packaging.
Return procedure for LT4356HMS-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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