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Analog Devices Inc. LT4356CS-2#PBF
- Part No.:
- LT4356CS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356CS-2#PBF.pdf
- Description:
- IC SURGE STOPPER 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,437
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Product details
Overview
LT4356CS-2#PBF 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 feedback-based output clamping, 50mV overcurrent sensing, and operates from 4V to 80V input with reverse input protection down to –60V. It is used in automotive power distribution systems requiring uninterrupted operation during transients.
For engineers reviewing the LT4356CS-2#PBF datasheet, LT4356CS-2#PBF pinout, LT4356CS-2#PBF application, or LT4356CS-2#PBF equivalent, key selection criteria include shutdown quiescent current (60µA), auxiliary amplifier availability during shutdown, 16-pin SO package compatibility, and guaranteed operation up to 125°C for industrial and automotive environments.
Technical Context
The LT4356CS-2#PBF integrates dual protection loops: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current-sense amplifier limiting ΔVSNS to 50mV during overcurrent faults. Both conditions drive a programmable fault timer via the TMR pin using voltage-dependent charging currents (2–260µA) scaled to MOSFET VDS.
Unlike the LT4356-1 variant, the LT4356-2 maintains its internal 1.25V reference and auxiliary amplifier active in shutdown mode, enabling undervoltage lockout or always-on regulator functions. Its SHDN pin withstands –60V to 100V and features TTL-compatible thresholds with 100µs low-pulse requirement for reliable entry/exit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - supports cold-crank automotive operation and high-voltage industrial rails. |
| Overcurrent Threshold | 50mV across SNS–VCC - sets precise current limit independent of temperature or supply variation. |
| FB Reference Voltage | 1.25V ±25mV - enables accurate output clamp adjustment via external resistor divider. |
| Shutdown Quiescent Current | 60µA (LT4356-2) - allows low-power monitoring while retaining auxiliary amplifier functionality. |
| Reverse Input Protection | –60V on VCC and SHDN - enables robust reverse-battery tolerance without external diodes. |
| Max Junction Temperature | 125°C (H-grade) - ensures reliability in under-hood automotive and industrial enclosures. |
| GATE Drive Capability | Pull-down: 150mA (OV), 10mA (OC); pull-up: –4µA to –50µA - actively controls N-MOSFET in linear regulation region. |
Pinout & Package
LT4356CS-2#PBF is housed in a 16-lead plastic SO package (SO-16), with exposed pad not applicable. Pin functions are defined per Analog Devices Rev. D datasheet and validated for this specific variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault Timer Input | Capacitor-connected node setting early-warning (100mV), fault (1.25V), and retry (0.5V) thresholds; current scales with VDS for SOA-optimized timing. |
| FB | Voltage Regulator Feedback | Servo input referenced to internal 1.25V; determines regulated output clamp voltage via external resistive divider. | NC | No Connect | Two unconnected pins (pins 3 and 6) - must remain floating; no internal connection or function. |
| OUT | Output Sense Input | Senses source voltage of external N-MOSFET; enables EN latching and TMR charging based on VCC–VOUT differential. |
| GATE | N-MOSFET Gate Driver | Charge-pump-driven output clamped to VOUT + 14V; delivers active pull-up/pull-down for linear regulation during faults. |
| SNS | Current Sense Input | Monitors voltage drop across external sense resistor; initiates overcurrent protection when ΔVSNS exceeds 50mV. |
| VCC | Main Supply Input | Accepts 4V–80V operating range; withstands –60V reverse bias; powers all internal circuitry including charge pump. |
| IN+ | Auxiliary Amplifier Input | Positive input of internal op-amp (1.25V ref on negative input); configurable as comparator or linear regulator controller. |
| AOUT | Auxiliary Amplifier Output | Open-collector output capable of sinking 2mA to 80V; drives LEDs, optocouplers, or PNP pass transistors. |
| GND | Device Ground | Reference node for all analog circuitry; connects to system ground plane for noise immunity and thermal dissipation. |
| EN | Enable Status Output | Open-collector indicator pulled high-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset. |
| FLT | Fault Indicator Output | Open-collector output pulled low at TMR = 1.25V; signals impending shutdown due to OV or OC condition. |
| SHDN | Shutdown Control Input | TTL-compatible input; pulls device into low-IQ mode (60µA) while preserving reference and auxiliary amplifier. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Overvoltage Clamp | Set via FB-resistor divider; maintains stable output during 80V surges without load interruption. |
| Dual Independent Fault Detection | Simultaneous OV (via FB) and OC (via SNS) monitoring with separate TMR current profiles for SOA-aware timing. |
| Active Auxiliary Amplifier in Shutdown | LT4356-2 retains 1.25V reference and AOUT/IN+ functionality during 60µA shutdown - enables UVLO or standby regulators. |
| Back-to-Back FET Reverse Protection Support | Eliminates Schottky diode drop; reduces power loss and improves cold-crank headroom in battery-fed systems. |
| Wide-Temperature Guaranteed Operation | Specified from –40°C to 125°C (H-grade); validated for under-hood automotive and industrial control applications. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs during ISO 7637-2 Pulse 5a (load dump) events reaching 60V/200ms. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V via external N-MOSFET while maintaining continuous operation. Use Value: Prevents system reset or component damage without sacrificing uptime during transient overvoltage. |
Use Scenario: Safely inserting/replacing power modules in 24V/48V industrial PLC backplanes. IC Role / Device Role / Timing Role: High-side switch with controlled turn-on/turn-off and overcurrent foldback. Use Value: Eliminates arcing and inrush stress; enables live insertion without disrupting downstream logic. |
| Intrinsic Safety Barrier Power | Avionics Transient Suppression |
|
Use Scenario: Powering IS-rated sensors in hazardous areas where fault energy must be strictly limited. IC Role / Device Role / Timing Role: Current-limited, thermally protected front-end regulator with <50mV sensing threshold. Use Value: Ensures fault energy remains below ignition thresholds even during short-circuit or surge events. |
Use Scenario: Protecting flight control electronics from MIL-STD-704E transient spikes up to 120V. IC Role / Device Role / Timing Role: Fast-response overvoltage regulator with sub-microsecond turn-off delay (tOFF(OV) = 0.25µs). Use Value: Maintains avionics functionality through rigorous aerospace surge profiles without latch-up. |
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#PBF | Same functionality and pinout; rated for –40°C to 85°C (I-grade) instead of 0°C to 70°C (C-grade). | Preferred for extended-temperature industrial or commercial deployments where ambient exceeds 70°C. | Select LT4356IS-2#PBF if operating ambient exceeds 70°C; otherwise LT4356CS-2#PBF offers cost-optimized C-grade qualification. |
| LT4356HS-2#PBF | Identical architecture and pinout; qualified for –40°C to 125°C (H-grade) with higher thermal margin. | Required for under-hood automotive, military, or high-reliability applications demanding full 125°C operation. | Choose LT4356HS-2#PBF when junction temperature may exceed 125°C or when AEC-Q100 compliance is mandated. |
Compared with LT4356IS-2#PBF and LT4356HS-2#PBF, the LT4356CS-2#PBF provides identical surge protection, auxiliary amplifier behavior, and SO-16 packaging at the lowest cost point for commercial-temperature applications - making it optimal for non-extended-ambient designs where thermal derating is not required.
Availability
LT4356CS-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, and intrinsic safety barrier power requiring stable component supply and long-term manufacturability.
Supply support for LT4356CS-2#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 industrial, automotive, communications, and healthcare markets.
The LT4356 family is designed as high-voltage surge stoppers for protecting downstream loads from automotive load dump, industrial transients, and hot-swap events - emphasizing robustness, precision regulation, and integrated fault management.
FAQ
What is the key functional difference between LT4356CS-2#PBF and LT4356CS-1#PBF?
The LT4356CS-2#PBF maintains its internal 1.25V reference and auxiliary amplifier active during shutdown, enabling undervoltage lockout or always-on regulator functions. In contrast, the LT4356CS-1#PBF disables all functional blocks in shutdown, reducing quiescent current to 7µA. This makes LT4356CS-2#PBF essential for applications requiring monitoring or control during standby.
Can LT4356CS-2#PBF drive a logic-level N-channel MOSFET at 5V VCC?
Yes - the LT4356CS-2#PBF's GATE pin delivers a minimum ΔVGATE of 4.5V at VCC = 4V, sufficient to fully enhance logic-level N-MOSFETs. At 5V VCC, the gate drive exceeds 5V, ensuring low RDS(on) conduction and minimal dropout during normal operation.
How does the TMR pin current scale with input voltage in overvoltage mode?
In overvoltage mode, the TMR pin current starts at ~2µA for VDS ≤ 0.5V and increases linearly to 50µA at VDS = 75V. This voltage-proportional scaling ensures shorter fault timers during high-stress conditions, protecting the external MOSFET's safe operating area - a feature confirmed in Figure 1 of the LT4356-1/LT4356-2 Rev. D datasheet.
Is LT4356CS-2#PBF compatible with back-to-back N-MOSFET reverse polarity protection?
Yes - the LT4356CS-2#PBF supports back-to-back N-MOSFET configurations for reverse input protection, eliminating Schottky diode losses. Its SHDN and VCC pins tolerate –60V, and its gate drive architecture accommodates bidirectional blocking, as explicitly stated in the "DESCRIPTION" and "APPLICATIONS INFORMATION" sections of the datasheet.
What is the maximum allowable voltage difference between SNS and VCC pins?
The absolute maximum rating specifies that the voltage difference between SNS and VCC must not exceed 30V. While SNS can be pulled below ground to –60V, this constraint ensures the internal current-sense amplifier operates within safe limits - a critical design boundary verified in the "ABSOLUTE MAXIMUM RATINGS" table on page 2 of the datasheet.
LT4356CS-2#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
LT4356CS-2#PBF FAQ
1.How can I place an order for LT4356CS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CS-2#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 LT4356CS-2#PBF reliable?
The price and inventory of LT4356CS-2#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CS-2#PBF?
LT4356CS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CS-2#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 LT4356CS-2#PBF?
For technical support, including LT4356CS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CS-2#PBF requirements.
6.How does Aetrix verify that LT4356CS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CS-2#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 LT4356CS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CS-2#PBF?
All LT4356CS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CS-2#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 LT4356CS-2#PBF part is unused and in its original packaging.
Return procedure for LT4356CS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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