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Analog Devices Inc. LT4356HS-2#TRPBF
- Part No.:
- LT4356HS-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356HS-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT4356HS-2#TRPBF from Analog Devices is a high-voltage surge stopper IC that regulates output during overvoltage transients (e.g., automotive load dump) by controlling an external N-channel MOSFET gate. It provides adjustable 1.25V FB-based output clamping, 50mV overcurrent sensing, and operates from 4V to 80V input with –60V reverse input tolerance. It is used in automotive power distribution systems requiring uninterrupted operation under transient stress.
For engineers reviewing the LT4356HS-2#TRPBF datasheet, LT4356HS-2#TRPBF pinout, LT4356HS-2#TRPBF application, or LT4356HS-2#TRPBF equivalent, key selection criteria include its 125°C operating temperature rating, 60µA shutdown current with auxiliary amplifier retention, SO-16 package compatibility, and fault timer behavior tied to VDS-dependent current sourcing.
Technical Context
The LT4356HS-2#TRPBF implements dual-loop protection: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current-sense amplifier limiting ΔVSNS = VCC – VSNS to 50mV during overcurrent. Its TMR pin charges with a VDS-scaled current-up to 50µA in overvoltage and 260µA in overcurrent-to dynamically align fault timing with MOSFET safe operating area constraints.
Unlike the LT4356-1 variant, the LT4356HS-2#TRPBF maintains auxiliary amplifier functionality and internal 1.25V reference during shutdown, enabling undervoltage lockout or always-on regulator control. Its SHDN pin tolerates –60V to +100V and features TTL-compatible threshold logic with 100µs low-pulse requirement for reliable entry/exit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V input; supports cold-crank operation and survives –60V reverse battery without damage. |
| Overvoltage Clamp Threshold | 1.25V at FB pin; sets output clamp voltage via external resistive divider (e.g., 27V clamp in typical app). |
| Overcurrent Sense Threshold | 50mV across sense resistor (ΔVSNS); enables precise, adjustable current limiting independent of supply voltage. |
| Shutdown Quiescent Current | 60µA at TA = 25°C; retains auxiliary amplifier and reference for wake-up or monitoring functions. |
| Fault Timer Current Scaling | VDS-dependent: 2–50µA (OV), 4–260µA (OC); ensures faster turn-off under high-power fault conditions. |
| Operating Temperature Range | –40°C to +125°C (H-grade); qualified for under-hood automotive and industrial high-temp environments. |
| Package | 16-Lead Plastic SO; industry-standard footprint with θJA = 100°C/W and 150°C max storage temperature. |
Pinout & Package
LT4356HS-2#TRPBF is housed in a 16-lead plastic SO package (SO-16), with exposed thermal pad not present. Pin 1 is bottom-left corner when notch faces up; pin numbering proceeds counterclockwise. GND (Pin 7) and exposed pad are not connected in SO variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor connection | Charges with VDS-scaled current; thresholds at 1.25V (FLT assert) and 1.35V (GATE off); 0.5V retry threshold enables auto-restart. |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; connects to center tap of output divider; clamped to 7V internally. |
| OUT | MOSFET source voltage sense | Senses VOUT to enable EN latching and set TMR charging current; referenced to VCC. |
| GATE | N-MOSFET gate drive output | Charge-pump driven; clamped to VOUT + 14V; pulls down with 150mA (OV) or 10mA (OC) to turn off pass device. |
| SNS | Current sense input | Monitors VCC – VSNS; active amplifier limits differential to 50mV; tolerates –60V below GND if VCC – VSNS ≤ 30V. |
| VCC | Main supply input | 4V–80V operating range; withstands –60V reverse; powers internal circuitry and charge pump. |
| IN+ | Auxiliary amplifier non-inverting input | Used for level detection or linear regulator control; clamped to 7V; tied to GND if unused. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs/optocouplers; negative input tied to internal 1.25V reference. |
| SHDN | Shutdown control input | TTL-compatible; <0.4V for 100µs initiates shutdown; >2.1V with >10V/ms slew rate exits; tolerates –60V to +100V. |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V; sinks up to 3mA from 80V; signals impending power-down before GATE turns off. |
| EN | Open-collector enable output | High-impedance when VOUT > VCC – 0.7V; latched until VOUT resets below 0.5V then rises above 2V. |
| GND | Device ground reference | Primary return path for internal amplifiers, timers, and logic; not thermally enhanced in SO package. |
Key Features
| Feature | Design Value |
|---|---|
| VDS-adaptive fault timer | Timer current scales with MOSFET drain-source voltage-ensuring shorter fault intervals under higher stress and preserving SOA compliance. |
| Retained auxiliary amplifier in shutdown | LT4356HS-2#TRPBF keeps AOUT/IN+/1.25V reference active during 60µA shutdown mode-enabling UVLO or always-on bias generation. |
| Reverse input protection to –60V | Withstands full reverse battery condition without latch-up or damage; SNS and VCC pins rated for –60V relative to GND. |
| Adjustable overvoltage clamp | 1.25V FB reference allows precise, resistor-divider-set output clamping (e.g., 27V for 12V systems) without external components. |
| Back-to-back FET reverse polarity support | Enables replacement of Schottky diodes with two N-MOSFETs-reducing forward drop, power loss, and heat in high-current paths. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protects infotainment, ADAS, and body control modules during ISO 7637-2 Pulse 5a load dump events (60V/200ms). IC Role / Device Role / Timing Role: Surge stopper regulating output via external N-MOSFET; uses VDS-scaled TMR current to limit MOSFET SOA stress during sustained overvoltage. Use Value: Enables continuous operation during transients while preventing MOSFET thermal runaway-critical for ASIL-B functional safety paths. |
Use Scenario: Safely inserts power modules into live 24V/48V backplanes in programmable logic controllers and factory automation racks. IC Role / Device Role / Timing Role: High-side switch controller with adjustable current limit and soft-start via TMR capacitor; FLT pin signals pre-fault warning. Use Value: Prevents inrush-induced bus collapse and protects upstream supplies-eliminates need for discrete current-limiting circuits or fuses. |
| Intrinsic Safety Barrier Power Supply | Avionics Power Conditioning |
|
Use Scenario: Powers intrinsically safe field instruments in hazardous areas where energy-limited 12V/24V supplies must survive lightning-induced surges. IC Role / Device Role / Timing Role: Overvoltage/overcurrent protector with 125°C H-grade rating; uses 50mV SNS threshold for precise current limiting in low-power loops. Use Value: Meets IEC 60079-11 energy storage limits while providing robust transient immunity-reducing component count vs. multi-stage protection. |
Use Scenario: Regulates unregulated 28V aircraft bus power for flight control computers and sensors subject to MIL-STD-704E transients. IC Role / Device Role / Timing Role: Input surge stopper with –60V reverse tolerance and 1.25V FB-based clamping; SHDN pin interfaces with avionics watchdog logic. Use Value: Guarantees operation across –40°C to +125°C ambient and eliminates single-point failure modes in redundant power paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-2#TRPBF | Lower voltage range (4.5V–40V); integrated MOSFET driver with fixed 28V clamp; no auxiliary amplifier. | Better suited for 24V industrial systems with less severe transients; lacks programmable clamp and reverse-battery tolerance. | Select LTC4365IMS-2#TRPBF only if input stays ≤40V and auxiliary functions are unnecessary-simpler layout but less flexible. |
| TPS26631PWPR | Integrated 80V eFuse with 1.2A current limit; fixed 32V OVP; no VDS-adaptive timer or FB-based clamp adjustment. | Targets USB-PD and PoE-powered devices; lacks analog control loop for precision clamping or SOA-aware timing. | Choose TPS26631PWPR for cost-sensitive, lower-current applications needing basic eFuse protection-not for high-energy automotive transients. |
Compared with LTC4365IMS-2#TRPBF and TPS26631PWPR, the LT4356HS-2#TRPBF delivers superior design flexibility through its programmable FB clamp, VDS-adaptive fault timer, retained auxiliary amplifier in shutdown, and –60V reverse input capability-making it uniquely suitable for high-reliability, wide-input automotive and avionics surge protection.
Availability
LT4356HS-2#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, and intrinsic safety barrier power supplies requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT4356HS-2#TRPBF 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.
The LT4356 family is designed as high-voltage surge stoppers for mission-critical power rails-specifically targeting automotive, avionics, and industrial systems where uninterrupted operation during transients is mandatory.
FAQ
What is the maximum reverse input voltage the LT4356HS-2#TRPBF can withstand?
The LT4356HS-2#TRPBF withstands –60V on both VCC and SNS pins relative to GND without damage. This meets automotive reverse-battery test requirements per ISO 16750-2. The absolute maximum rating specifies VCC and SHDN pins tolerate –60V to +100V, making LT4356HS-2#TRPBF suitable for harsh vehicle electrical environments where polarity reversal is possible.
How does the LT4356HS-2#TRPBF differ from the LT4356HS-1#TRPBF in shutdown mode?
The LT4356HS-2#TRPBF draws 60µA in shutdown while retaining operation of the auxiliary amplifier and internal 1.25V reference-enabling undervoltage lockout or always-on regulator control. In contrast, the LT4356HS-1#TRPBF draws only 7µA but disables all functional blocks including the auxiliary amplifier. This makes LT4356HS-2#TRPBF ideal for systems requiring wake-up capability or bias generation during standby.
Can the LT4356HS-2#TRPBF be used with back-to-back N-channel MOSFETs for reverse polarity protection?
Yes-the LT4356HS-2#TRPBF supports back-to-back N-MOSFET configurations by driving both gates synchronously via the GATE pin. This replaces lossy Schottky diodes, reducing forward voltage drop and power dissipation. The IC's –60V reverse tolerance on VCC and SNS pins ensures robustness during reverse-battery events when used with this topology.
What is the purpose of the TMR pin's VDS-dependent current sourcing in the LT4356HS-2#TRPBF?
The TMR pin current scales with VDS (VCC – OUT) to dynamically adjust fault timing based on MOSFET stress-higher VDS yields faster TMR charging, shortening the fault interval. This ensures the external MOSFET remains within its Safe Operating Area during overvoltage or overcurrent events, preventing thermal failure without requiring complex external compensation.
Does the LT4356HS-2#TRPBF require an external resistor divider for overvoltage clamping?
Yes-the LT4356HS-2#TRPBF uses the FB pin as a servo point referenced to an internal 1.25V bandgap. An external resistive divider between OUT and GND sets the actual clamp voltage (e.g., 27V = 1.25V × (R1+R2)/R2). No other components are needed for basic clamping, and the FB pin is internally clamped to 7V for overvoltage protection.
LT4356HS-2#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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-2#TRPBF FAQ
1.How can I place an order for LT4356HS-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HS-2#TRPBF 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-2#TRPBF reliable?
The price and inventory of LT4356HS-2#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356HS-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356HS-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HS-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HS-2#TRPBF?
LT4356HS-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HS-2#TRPBF 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-2#TRPBF?
For technical support, including LT4356HS-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HS-2#TRPBF requirements.
6.How does Aetrix verify that LT4356HS-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356HS-2#TRPBF 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-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356HS-2#TRPBF?
All LT4356HS-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HS-2#TRPBF, 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-2#TRPBF part is unused and in its original packaging.
Return procedure for LT4356HS-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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