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Analog Devices Inc. LT4356HDE-1
- Part No.:
- LT4356HDE-1
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356HDE-1.pdf
- Description:
- IC OVERVOLT PROT REG 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,806
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Product details
Overview
LT4356HDE-1 from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during transients (e.g., automotive load dump) via external N-channel MOSFET gate control. It features 4V–80V operating range, –40°C to 125°C extended temperature rating, 7µA shutdown current, and integrated overvoltage/overcurrent fault detection with adjustable timer. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356HDE-1 datasheet, LT4356HDE-1 pinout, LT4356HDE-1 application, or LT4356HDE-1 equivalent, key selection criteria include its 12-lead DFN package, 1.25V FB reference, 50mV current sense threshold, TMR-based adaptive fault timing, and H-grade thermal robustness for under-hood deployment.
Technical Context
The LT4356HDE-1 implements dual-loop protection: a voltage amplifier servoing the GATE pin to maintain 1.25V at FB during overvoltage, and a current amplifier limiting ΔVSNS to 50mV during overcurrent. Its TMR pin draws a VDS-dependent current (2–50µA for OV, 4–260µA for OC), enabling MOSFET SOA-optimized timing.
It integrates a shutdown-controlled 7µA quiescent mode (LT4356-1 variant), reverse-input tolerance to –60V, and an auxiliary amplifier with 1.25V internal reference-configurable as comparator or linear regulator controller. The GATE driver clamps to 14V above OUT and supports logic-level MOSFETs down to 4.5V drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - enables cold-crank operation and withstands automotive load dump surges. |
| Shutdown Current | 7µA max - minimizes battery drain in always-on vehicle subsystems. |
| FB Reference Voltage | 1.215V to 1.275V - sets precise output clamp level via external resistor divider. |
| Current Sense Threshold | 42.5mV to 56mV - defines overcurrent trip point across temperature and grade. |
| Max Junction Temperature | 125°C - qualified for under-hood automotive environments. |
| Reverse Input Rating | –60V - supports reverse-battery protection without external diodes. |
| GATE Drive Clamp | 14V above OUT - ensures safe N-MOSFET gate-source voltage during regulation. |
Pinout & Package
LT4356HDE-1 is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed pad (Pin 13), rated for –40°C to 125°C operation. The exposed pad may be left unconnected or tied to GND for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Accepts external voltage for level detection or regulator setpoint; clamped to 7V. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; usable for LED indication or PNP base drive. |
| GND | Device ground reference | Common return for all internal circuits and exposed pad connection point. |
| EN | Open-collector enable status output | High-impedance when MOSFET is fully on; latched until OUT resets below 0.5V. |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V to warn of impending shutdown; sinks 3mA from 80V. |
| SHDN | Active-low shutdown control | Pulled below 0.4V to enter 7µA shutdown; withstands –60V to +100V. |
| TMR | Fault timer capacitor node | Charged by VDS-scaled current; thresholds at 1.25V (warning) and 1.35V (shutdown). |
| FB | Voltage regulation feedback input | Connected to resistive divider; servoed to 1.25V during overvoltage clamping. |
| OUT | MOSFET source voltage sense | Detects VDS for TMR current scaling and EN latch reset. |
| GATE | N-MOSFET gate drive output | Charge-pump driven; clamped to 14V above OUT; pulls down with 150mA during OV fault. |
| SNS | Current sense input | Monitors VCC–VSNS; limits differential to 50mV during overcurrent. |
| VCC | Main supply input | 4V–80V operation; withstands –60V reverse bias; powers internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Fault Timing | TMR current scales with VDS, shortening timeout during high-stress faults to protect MOSFET SOA. |
| Integrated Auxiliary Amplifier | 1.25V-referenced op-amp with AOUT sink capability-enables undervoltage lockout or linear regulator control without external parts. |
| Reverse Input Protection | Withstands –60V on VCC-allows back-to-back N-MOSFET configuration instead of lossy Schottky diode. |
| H-Temperature Grade | Guaranteed operation from –40°C to 125°C-qualified for engine compartment and industrial control applications. |
| Low-Power Shutdown | 7µA quiescent current in shutdown-preserves battery life in always-connected automotive modules. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
Use Scenario: Protecting infotainment ECUs during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V via external N-MOSFET while maintaining continuous load operation. Use Value: Enables uninterrupted system function during transients, eliminating need for oversized downstream capacitors or derated components. | Use Scenario: Safely inserting powered circuit cards into live backplanes in factory automation controllers. IC Role / Device Role / Timing Role: High-side switch with programmable fault timer and early-warning FLT signal before power removal. Use Value: Prevents arcing and bus voltage collapse during insertion; allows host controller to save state before forced shutdown. |
| Battery-Powered System High-Side Switch | Intrinsic Safety Barrier Interface |
Use Scenario: Controlling power to sensitive sensors in portable test equipment with Li-ion battery input. IC Role / Device Role / Timing Role: N-MOSFET gate driver with overcurrent limiting and 7µA shutdown for ultra-low standby leakage. Use Value: Extends battery runtime while providing fast (<4µs) overcurrent response and reverse-polarity resilience. | Use Scenario: Isolating hazardous-area field instruments from safe-area control systems using intrinsically safe barriers. IC Role / Device Role / Timing Role: Overvoltage protector limiting energy delivery during fault conditions per IEC 60079-11. Use Value: Ensures fault energy remains below ignition threshold even during sustained 80V surges, supporting certified safety integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356HDE-2#TRPBF | 60µA shutdown current; auxiliary amplifier remains active in shutdown | Required where undervoltage lockout or always-on monitoring must persist during low-power mode | Select LT4356HDE-2 if auxiliary amplifier functionality is needed during shutdown; otherwise LT4356HDE-1 offers lower quiescent current. |
| TPS26631RHFR | Integrated 80V MOSFET; fixed 28V clamp; no TMR-based adaptive timing | Limited to fixed-voltage clamping; lacks auxiliary amplifier and VDS-adaptive fault timing | Choose TPS26631RHFR for simplified layout with integrated FET, but only when adjustable clamp and SOA-optimized timing are not required. |
Compared with LT4356HDE-2, the LT4356HDE-1 provides deeper shutdown (7µA vs 60µA) at the cost of disabling the auxiliary amplifier; compared with TPS26631RHFR, it trades integration for design flexibility-external MOSFET selection enables optimized SOA handling and wide output voltage adjustment via FB divider.
Availability
LT4356HDE-1 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 LT4356HDE-1 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 product line delivers robust overvoltage and overcurrent protection for high-reliability power systems, specifically engineered for automotive surge resilience and industrial hot-swap survivability.
FAQ
What is the maximum allowable reverse voltage on the VCC pin of the LT4356HDE-1?
The LT4356HDE-1 supports reverse input protection to –60V on the VCC pin without damage. This enables direct connection to battery terminals in automotive systems where reverse polarity events may occur. The device maintains full functionality after recovery, and this rating applies across its –40°C to 125°C operating temperature range. Always verify PCB layout clearance for –60V standoff in high-reliability designs.
How does the LT4356HDE-1 differ from the LT4356HDE-2 in shutdown mode?
The LT4356HDE-1 reduces total supply current to ≤7µA in shutdown and disables the auxiliary amplifier, while the LT4356HDE-2 draws ≤60µA and keeps the auxiliary amplifier operational. This makes the LT4356HDE-2 suitable for applications requiring undervoltage lockout or always-on monitoring during low-power states. Both share identical overvoltage/overcurrent protection behavior and pinout.
What is the purpose of the TMR pin on the LT4356HDE-1, and how is timing adjusted?
The TMR pin on the LT4356HDE-1 sets fault timing via an external capacitor to ground. During overvoltage or overcurrent, a VDS-scaled current charges the capacitor; FLT asserts low at 1.25V (early warning), and GATE turns off at 1.35V. The cool-down period begins when TMR discharges to 0.5V. Timing is adjusted by selecting CTMR-e.g., 6.8µF yields ~100ms total fault window for 80V input.
Can the LT4356HDE-1 drive logic-level N-channel MOSFETs at low input voltages?
Yes-the LT4356HDE-1's GATE pin delivers ≥4.5V drive at VCC = 4V, enabling use of logic-level N-MOSFETs down to 4.5V VGS(th). At higher VCC, GATE is clamped to 14V above OUT, ensuring full enhancement. This supports cold-crank operation in 12V automotive systems where battery voltage drops to ~4V, maintaining reliable pass transistor conduction.
What is the guaranteed FB reference voltage tolerance for the LT4356HDE-1 across temperature?
The LT4356HDE-1 guarantees a FB reference voltage of 1.215V to 1.275V over its full –40°C to 125°C operating range. This 5% total tolerance enables accurate output voltage regulation when used with standard 1% resistors in the feedback divider. The tighter spec versus commercial-grade variants reflects qualification for extended-temperature automotive and industrial applications.
LT4356HDE-1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Clamping:
- 27V Adj
- Technology:
- External Switch
- Number of Circuits:
- 1
- Applications:
- -
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
LT4356HDE-1 FAQ
1.How can I place an order for LT4356HDE-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HDE-1 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 LT4356HDE-1 reliable?
The price and inventory of LT4356HDE-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356HDE-1 is usually 5 days.
3.What payment methods are accepted for LT4356HDE-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HDE-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HDE-1?
LT4356HDE-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HDE-1 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 LT4356HDE-1?
For technical support, including LT4356HDE-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HDE-1 requirements.
6.How does Aetrix verify that LT4356HDE-1 is sourced from the original manufacturer or authorized distributors?
All LT4356HDE-1 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 LT4356HDE-1 meets industry standards.
7.What is the process for return or replacement of LT4356HDE-1?
All LT4356HDE-1 units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HDE-1, 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 LT4356HDE-1 part is unused and in its original packaging.
Return procedure for LT4356HDE-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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