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Analog Devices Inc. LT4356CS-2#TRPBF
- Part No.:
- LT4356CS-2#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356CS-2#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
LT4356CS-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 reverse input protection down to –60V. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356CS-2#TRPBF datasheet, LT4356CS-2#TRPBF pinout, LT4356CS-2#TRPBF application, or LT4356CS-2#TRPBF equivalent, key selection criteria include its 60µA shutdown current (vs. 7µA in LT4356-1), active auxiliary amplifier during shutdown, 16-pin SO package, –40°C to 85°C temperature grade (I-grade), and fault timer behavior scaling with VDS.
Technical Context
The LT4356CS-2#TRPBF implements dual-loop protection: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current amplifier limiting ΔVSNS = VCC – VSNS to 50mV during overcurrent faults. Its TMR pin charges with a VDS-dependent current - up to 50µA in overvoltage and 260µA in overcurrent - enabling adaptive fault timing aligned with MOSFET safe operating area (SOA).
Unlike the LT4356-1, the LT4356-2 variant maintains auxiliary amplifier functionality and internal 1.25V reference during shutdown, supporting undervoltage lockout or always-on regulation. The SHDN pin tolerates –60V to 100V and features TTL-compatible thresholds (0.4V low, 2.1V high) with 100µs minimum low pulse width for reliable entry/exit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V continuous operation; withstands –60V reverse input without damage. |
| Shutdown Current | 60µA typical at 25°C - enables low-power standby while retaining auxiliary amplifier functionality. |
| Overcurrent Threshold | 50mV ΔVSNS - sets precise current limit via external sense resistor; supports scalable protection. |
| FB Reference Voltage | 1.25V ±25mV - defines regulated output clamp voltage via external resistive divider on OUT pin. |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for automotive and industrial environments. |
| Package | 16-lead plastic SO - standard footprint compatible with automated assembly and thermal management up to 100°C/W θJA. |
| Fault Timer Scaling | VDS-dependent TMR current - 2µA to 50µA (OV), 4µA to 260µA (OC) - dynamically matches MOSFET SOA limits. |
Pinout & Package
LT4356CS-2#TRPBF is housed in a 16-lead plastic SO package (SO-16), with exposed thermal pad not present. Pin 1 is located at bottom-left corner when notch faces upward. GND (Pin 7) serves as primary reference; VCC (Pin 8) supplies internal circuitry; SNS (Pin 6) senses current via external resistor; GATE (Pin 5) drives external N-MOSFET gate with charge pump and clamp.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 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. |
| 2 FB | Output voltage feedback input | Servo point for 1.25V reference; connects to resistive divider on OUT to set clamp voltage; clamped to 7V max. |
| 3 NC | No connect | Internally unused; must remain unconnected per datasheet. |
| 4 OUT | MOSFET source voltage sense | Senses source node of external N-MOSFET; used for EN latching and TMR current scaling; referenced to VCC. |
| 5 GATE | N-MOSFET gate driver output | Charge-pump driven; clamped to VOUT + 14V; pulls down with 150mA (OV) or 10mA (OC) to turn off pass device. |
| 6 SNS | Current sense input | Monitors voltage drop across sense resistor between VCC and SNS; ΔVSNS limited to 50mV for overcurrent protection. |
| 7 GND | Device ground reference | Primary return path for internal amplifiers, logic, and fault outputs; ties to system ground plane. |
| 8 VCC | Main supply input | 4V–80V operating range; withstands –60V reverse bias; powers all internal blocks including charge pump. |
| 9 IN+ | Auxiliary amplifier non-inverting input | Accepts external signal for comparator or linear regulator control; clamped to 7V; tied to GND if unused. |
| 10 NC | No connect | Internally unused; must remain unconnected. |
| 11 AOUT | Auxiliary amplifier output | Open-collector output capable of sinking 2mA up to 80V; used for UVLO, LED drive, or PNP base control. |
| 12 NC | No connect | Internally unused; must remain unconnected. |
| 13 GND | Secondary ground terminal | Provides additional low-impedance ground path; recommended to tie to same ground plane as Pin 7. |
| 14 EN | Enable status output | Open-collector; goes high-Z when VOUT > VCC – 0.7V (MOSFET fully on); latched until reset by VOUT cycling. |
| 15 FLT | Fault warning output | Open-collector; pulls low at TMR = 1.25V to indicate impending shutdown; sinks up to 3mA from 80V. |
| 16 SHDN | Shutdown control input | TTL-compatible; <0.4V initiates shutdown (60µA ICC); >2.1V with >10V/ms slew rate exits shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| VDS-adaptive fault timing | TMR current scales from 2µA to 50µA (OV) or 4µA to 260µA (OC), ensuring MOSFET remains within SOA under varying stress conditions. |
| Active auxiliary amplifier in shutdown | LT4356-2 retains 1.25V reference and AOUT/IN+ functionality during shutdown - enables always-on UVLO or backup regulation without waking main IC. |
| Reverse input protection to –60V | VCC and SHDN pins tolerate –60V reverse battery conditions; eliminates need for external series diode or FET in bidirectional power paths. |
| Adjustable output clamp voltage | Set via external resistor divider on FB/OUT; 1.25V reference allows precise regulation (e.g., 27V clamp with 21:1 ratio) without trimming. |
| Early warning fault indication | FLT asserts low 100mV before GATE turns off (tWARNING = CTMR × 20ms/µF), providing deterministic time for system backup or graceful shutdown. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS modules from 60V/200ms load dump transients in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V via external N-MOSFET while maintaining uninterrupted operation during transient. Use Value: Enables continued function during ISO 7637-2 Pulse 5a events; eliminates need for bulky TVS diodes or redundant power supplies. |
Use Scenario: Safely inserting/replacing power modules in 48V data center rack PDUs without interrupting upstream bus. IC Role / Device Role / Timing Role: High-side switch controller with programmable fault timer and soft-start via GATE ramp control. Use Value: Prevents arcing and inrush damage; supports IEEE 1621-compliant live insertion with sub-100ms fault response. |
| Back-to-Back Reverse Polarity Protection | Intrinsic Safety Barrier Power Management |
|
Use Scenario: Replacing Schottky diode in 24V industrial PLC I/O module for reduced forward drop and heat generation. IC Role / Device Role / Timing Role: Controls two N-MOSFETs in back-to-back configuration using GATE and SNS feedback for bidirectional blocking. Use Value: Cuts conduction loss by >70% vs. 0.4V Schottky; eliminates 1W+ diode heating in confined enclosures. |
Use Scenario: Powering hazardous-area sensors in Zone 1/2 gas detection systems requiring intrinsic safety certification. IC Role / Device Role / Timing Role: Fault-tolerant overvoltage/overcurrent protector with guaranteed <125°C operation and fail-safe shutdown. Use Value: Meets IEC 60079-11 energy-limited barrier requirements; enables certified 2-wire loop-powered designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356IS-2#TRPBF | Same functionality and pinout; differs only in temperature grade (–40°C to 125°C H-grade vs. –40°C to 85°C I-grade). | Required for under-hood automotive or high-ambient industrial use where junction temperature exceeds 85°C. | Select LT4356IS-2#TRPBF when ambient exceeds 85°C or when extended reliability testing mandates H-grade qualification. |
| LT4356CMS-2#TRPBF | Same electrical specs; packaged in 10-lead MSOP (3mm × 3mm) instead of 16-lead SO; no IN+, AOUT, or NC pins. | Used where board space is constrained and auxiliary amplifier functionality is not required. | Choose LT4356CMS-2#TRPBF for compact designs omitting level detection or linear regulator control functions. |
Compared with LT4356CS-2#TRPBF, the LT4356IS-2#TRPBF extends thermal capability for harsh environments, while the LT4356CMS-2#TRPBF reduces footprint and BOM count by removing auxiliary analog functions - both retain identical surge protection architecture and fault timing behavior.
Availability
LT4356CS-2#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, and intrinsic safety barrier power management requiring stable component supply and long-term industrial lifecycle support.
Supply support for LT4356CS-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 precision instrumentation, industrial automation, and automotive markets.
The LT4356 family is designed as high-voltage surge stoppers for protecting downstream loads from automotive load dump, industrial transients, and overcurrent faults - emphasizing robustness, adaptive fault timing, and integration of auxiliary monitoring functions.
FAQ
What is the key functional difference between LT4356CS-2#TRPBF and LT4356CS-1#TRPBF?
The LT4356CS-2#TRPBF maintains its auxiliary amplifier and internal 1.25V reference during shutdown, drawing 60µA typical quiescent current, whereas the LT4356CS-1#TRPBF disables all functional blocks in shutdown, drawing only 7µA. This makes the LT4356CS-2#TRPBF suitable for applications requiring undervoltage lockout or always-on regulation during standby - a critical distinction confirmed in the datasheet's "Features" and "Electrical Characteristics" tables.
Can LT4356CS-2#TRPBF be used with a P-channel MOSFET instead of an N-channel MOSFET?
No - the LT4356CS-2#TRPBF is specifically designed to drive N-channel MOSFETs in high-side configuration, with GATE output referenced to OUT and clamped to VOUT + 14V. It lacks the bootstrap or level-shifting circuitry required for efficient P-channel gate drive. Using a P-channel device would prevent proper regulation and violate the IC's operational architecture as defined in the "Operation" and "Block Diagram" sections.
What is the maximum allowable voltage difference between VCC and SNS pins on LT4356CS-2#TRPBF?
The absolute maximum rating specifies that the voltage difference between VCC and SNS must not exceed 30V, even though SNS can be pulled below ground to –60V. This constraint is explicitly stated in the "Absolute Maximum Ratings" table and reinforced in the "PIN FUNCTIONS" description for SNS, where it notes "the voltage difference with the VCC pin must be limited to less than 30V." Exceeding this risks permanent damage.
How does the fault timer behavior differ between overvoltage and overcurrent conditions on LT4356CS-2#TRPBF?
During overvoltage, TMR current scales from 2µA to 50µA with VDS; after FLT asserts at 1.25V, current drops to fixed 5µA for a 100mV early warning window. During overcurrent, TMR current scales more aggressively - from 4µA to 260µA - and remains at full scale after FLT assertion, resulting in faster total fault timing (e.g., 2.86ms/µF vs. 20ms/µF warning). This differentiation is documented in Figures 1 and 2 and the "Fault Timer" section.
Is LT4356CS-2#TRPBF RoHS compliant and lead-free?
Yes - the "#TRPBF" suffix in LT4356CS-2#TRPBF denotes lead-free (Pb-free) and RoHS-compliant packaging, as confirmed in Analog Devices' official ordering information table, where "#PBF" and "#TRPBF" variants are explicitly designated as Pb-free. The device meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard reflow profiles.
LT4356CS-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
LT4356CS-2#TRPBF FAQ
1.How can I place an order for LT4356CS-2#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CS-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 LT4356CS-2#TRPBF reliable?
The price and inventory of LT4356CS-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 LT4356CS-2#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356CS-2#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CS-2#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CS-2#TRPBF?
LT4356CS-2#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CS-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 LT4356CS-2#TRPBF?
For technical support, including LT4356CS-2#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CS-2#TRPBF requirements.
6.How does Aetrix verify that LT4356CS-2#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356CS-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 LT4356CS-2#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356CS-2#TRPBF?
All LT4356CS-2#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CS-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 LT4356CS-2#TRPBF part is unused and in its original packaging.
Return procedure for LT4356CS-2#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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