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Analog Devices Inc. LT4356HS-1#PBF
- Part No.:
- LT4356HS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356HS-1#PBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:260
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Product details
Overview
LT4356HS-1#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) via external N-channel MOSFET gate control. It features 4V–80V operating range, 50mV overcurrent sense threshold, 7µA shutdown current, and guaranteed operation to 125°C in 16-pin SO package. Used in automotive power distribution systems requiring robust transient immunity.
For engineers reviewing the LT4356HS-1#PBF datasheet, LT4356HS-1#PBF pinout, LT4356HS-1#PBF application, or LT4356HS-1#PBF equivalent, key selection criteria include adjustable fault timer response, reverse input protection to –60V, auxiliary amplifier capability for undervoltage detection, and thermal performance at 125°C junction temperature.
Technical Context
The LT4356HS-1#PBF implements dual-fault protection: overvoltage regulation via FB-servo loop maintaining 1.25V at feedback pin, and overcurrent limiting by clamping VCC–VSNS to 50mV. Fault timing is dynamically scaled with VDS across the external MOSFET to optimize Safe Operating Area (SOA) utilization.
It integrates a charge pump for N-MOSFET gate drive up to 14V above OUT, supports back-to-back FET reverse polarity protection, and provides open-collector FLT/EN/AOUT outputs rated for 80V sink capability. The SHDN pin withstands –60V to 100V and enables <7µA quiescent current in shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - Enables operation during cold-crank (≥4V) and withstands 80V automotive transients. |
| Overcurrent Sense Threshold | 50mV - Sets precise current limit via external sense resistor; reduces MOSFET stress during short circuits. |
| Shutdown Current | 7µA - Minimizes battery drain in always-on automotive systems when disabled. |
| Max Junction Temperature | 125°C - Rated for under-hood automotive environments without derating. |
| Reverse Input Protection | –60V - Allows direct connection to reverse-battery conditions without external diodes. |
| GATE Drive Offset | Up to 14V above OUT - Ensures full enhancement of standard N-channel MOSFETs even at low VIN. |
| Fault Timer Dynamic Scaling | Voltage-dependent TMR current (2µA–260µA) - Adapts turn-off timing to MOSFET SOA across fault severity. |
Pinout & Package
LT4356HS-1#PBF is housed in a 16-lead plastic SO package (SO-16), with exposed thermal pad not present (unlike DFN variant). Pin functions are electrically identical to the SO-package family, supporting industrial and automotive PCB layouts with standard SOIC footprints.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor node | Charged by dynamic current source proportional to VDS; triggers FLT at 1.25V and GATE turn-off at 1.35V. |
| FB | Output voltage feedback input | Servo point for overvoltage regulation; internal 1.25V reference sets clamp voltage via external resistor divider. |
| OUT | MOSFET source sense input | Monitors pass transistor source voltage to enable EN latching and set TMR charging current baseline. |
| GATE | N-MOSFET gate driver output | Charge-pump-driven output clamped to +14V above OUT; regulates MOSFET conduction during faults. |
| SNS | Current sense input | Detects VCC–VSNS drop; initiates overcurrent limiting at 50mV and starts TMR charging. |
| VCC | Main supply input | Accepts 4V–80V; survives –60V reverse bias; powers all internal circuitry including charge pump. |
| SHDN | Shutdown control input | TTL-compatible input; pulls device into 7µA shutdown state; withstands –60V to 100V. |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V to warn of impending power-down; sinks up to 3mA from 80V. |
| EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VVCC – 0.7V); latched until reset. |
| AOUT | Auxiliary amplifier output | Open-collector output of internal amp (ref = 1.25V); drives LEDs, optos, or PNP linear regulators. |
| IN+ | Auxiliary amplifier non-inverting input | Configurable as comparator input; clamped to 7V; tied to GND if unused. |
| GND | Device ground reference | Return path for internal amplifiers, logic, and charge pump; must be low-impedance for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer scaling | TMR current scales with VDS (2–260µA), ensuring MOSFET stays within SOA during varying fault severity. |
| Back-to-back FET reverse protection | Enables replacement of Schottky diode with two N-MOSFETs, reducing forward drop and power loss. |
| 80V-rated open-collector outputs | FLT, EN, and AOUT sink up to 3mA from 80V, eliminating need for level-shifting interface components. |
| Integrated 1.25V reference | Stable reference used for FB servo and auxiliary amplifier, enabling accurate voltage clamping and monitoring. |
| –60V to 100V SHDN tolerance | Allows direct connection to battery rail in harsh automotive environments without external protection. |
Applications
| Automotive Load Dump Protection | 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 safe clamp voltage while dynamically adjusting fault timer based on MOSFET VDS. Use Value: Maintains uninterrupted operation during transients up to 60V, avoiding system resets and data loss. |
Use Scenario: Inserting powered modules into live backplane systems without causing bus glitches or damage. IC Role / Device Role / Timing Role: High-side switch controller limiting inrush current and blocking reverse current during insertion. Use Value: Enables zero-downtime field upgrades via controlled MOSFET turn-on and reverse polarity blocking. |
| Intrinsic Safety Barriers | Battery-Powered System High-Side Switch |
|
Use Scenario: Isolating hazardous-area sensors in oil/gas instrumentation where energy limitation is critical. IC Role / Device Role / Timing Role: Current-limited power switch enforcing strict I2t limits via 50mV sense threshold and fast overcurrent turn-off. Use Value: Guarantees energy delivery remains below ignition thresholds even during short-circuit faults. |
Use Scenario: Managing main battery feed to motor controllers or displays in portable medical devices. IC Role / Device Role / Timing Role: Low-quiescent high-side switch with 7µA shutdown current and 125°C operation for sealed enclosures. Use Value: Extends battery life during standby and ensures reliability in thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356HS-2#PBF | 60µA shutdown current vs. 7µA; auxiliary amplifier remains active in shutdown; no OV/OC latch reset on power cycle. | Preferred for systems requiring undervoltage lockout or always-on monitoring during standby. | Select LT4356HS-2#PBF only if auxiliary amplifier functionality during shutdown is required; otherwise LT4356HS-1#PBF offers lower quiescent power. |
| TPS26631PWPR | Fixed 28V clamp (non-adjustable); integrated MOSFET; no dynamic fault timer; 65V abs max rating. | Suitable for cost-sensitive, space-constrained designs where adjustable clamping and external MOSFET flexibility are unnecessary. | Choose TPS26631PWPR for simplified BOM and layout where 28V fixed clamp and 65V rating meet system requirements. |
Compared with LT4356HS-2#PBF, the LT4356HS-1#PBF delivers significantly lower shutdown current (7µA vs. 60µA) at the expense of auxiliary amplifier disablement, while versus TPS26631PWPR it trades integrated simplicity for design flexibility, higher voltage rating (80V vs. 65V), and precision adjustable protection.
Availability
LT4356HS-1#PBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial hot-swap subsystems, and intrinsic safety barrier designs requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT4356HS-1#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT4356 family is designed as high-voltage surge stoppers for mission-critical power rails, emphasizing robust transient immunity, MOSFET SOA optimization, and operation in extreme ambient temperatures up to 125°C.
FAQ
What is the maximum input voltage the LT4356HS-1#PBF can withstand continuously?
The LT4356HS-1#PBF operates continuously from 4V to 80V on its VCC pin. Its absolute maximum rating allows VCC to be pulled to –60V (reverse battery) without damage, but continuous operation is specified only within the 4V–80V range. Operation outside this range may cause functional failure or permanent damage.
How does the LT4356HS-1#PBF implement overcurrent protection?
The LT4356HS-1#PBF monitors the voltage drop between VCC and SNS pins. When ΔVSNS reaches 50mV, its internal current-limit amplifier regulates the GATE pin to hold that threshold, limiting load current. Simultaneously, it sources a scaled current into the TMR pin-up to 260µA during severe overcurrent-to trigger FLT assertion and eventual MOSFET turn-off.
Can the LT4356HS-1#PBF be used with P-channel MOSFETs?
No. The LT4356HS-1#PBF is specifically designed to drive N-channel MOSFETs in high-side configuration, using an internal charge pump to generate gate voltage above the source. It lacks the architecture to properly bias or control P-channel devices, which require gate drive below the source potential.
What is the purpose of the AOUT and IN+ pins on the LT4356HS-1#PBF?
AOUT is the open-collector output of an internal auxiliary amplifier referenced to 1.25V. IN+ is its non-inverting input. Together they enable configurable functions such as undervoltage lockout comparators or linear regulator controllers driving external PNP transistors-providing system-level monitoring without additional ICs.
Does the LT4356HS-1#PBF require external components for basic overvoltage protection?
Yes. Basic operation requires an external N-channel MOSFET, output resistive divider (for FB pin), timer capacitor (TMR-to-GND), and current sense resistor (between VCC and SNS). These components set clamp voltage, fault timing, and current limit threshold-making the LT4356HS-1#PBF a controller, not a self-contained solution.
LT4356HS-1#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-1#PBF FAQ
1.How can I place an order for LT4356HS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HS-1#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-1#PBF reliable?
The price and inventory of LT4356HS-1#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-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4356HS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HS-1#PBF?
LT4356HS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HS-1#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-1#PBF?
For technical support, including LT4356HS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HS-1#PBF requirements.
6.How does Aetrix verify that LT4356HS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356HS-1#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-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4356HS-1#PBF?
All LT4356HS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HS-1#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-1#PBF part is unused and in its original packaging.
Return procedure for LT4356HS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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