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Analog Devices Inc. LT4356CDE-1#PBF
- Part No.:
- LT4356CDE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356CDE-1#PBF.pdf
- Description:
- IC OVERVOLT PROT REG 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:351
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Product details
Overview
LT4356CDE-1#PBF from Analog Devices is a 4V–80V automotive-grade surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients (e.g., load dump) via external N-channel MOSFET gate control, provides adjustable 50mV overcurrent sensing, features 7µA shutdown current, and operates from 0°C to 70°C in a 12-pin DFN package.
For engineers reviewing the LT4356CDE-1#PBF datasheet, LT4356CDE-1#PBF pinout, LT4356CDE-1#PBF application, or LT4356CDE-1#PBF equivalent, key selection considerations include its 1.25V FB reference accuracy, TMR-based adaptive fault timing, reverse input tolerance to –60V, SHDN pin rating up to 100V, and compatibility with high-voltage N-channel MOSFETs for battery-powered systems requiring robust transient immunity.
Technical Context
The LT4356CDE-1#PBF implements dual-loop protection: a voltage amplifier servoing the GATE pin to maintain 1.25V at FB during overvoltage, and a current-sense amplifier limiting ΔVSNS to 50mV during overcurrent. Its TMR pin uses voltage-dependent charging current-scaling from 2µA to 50µA (OV) or 4µA to 260µA (OC)-to dynamically adapt fault timing to MOSFET stress across VDS.
It integrates a 4µA internal SHDN pull-up, supports back-to-back FET reverse polarity protection, and latches EN high-impedance when OUT > VCC – 0.7V. The FLT pin asserts low at VTMR = 1.25V for early warning and triggers GATE turn-off at VTMR = 1.35V, followed by automatic retry after VTMR falls to 0.5V post-cooldown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - enables operation during automotive cold crank (≥4V) and withstands 80V load dump surges. |
| Shutdown Quiescent Current | 7µA - minimizes battery drain in always-on vehicle systems when SHDN is pulled low. |
| Overcurrent Threshold | 50mV across SNS–VCC - sets precise current limit independent of supply voltage, enabling scalable sense resistor selection. |
| FB Reference Voltage | 1.25V ±25mV - defines regulated output clamp level via external resistive divider; stable over full temperature range. |
| Reverse Input Rating | –60V on VCC/SHDN - allows direct connection to reversed battery without external diode or protection circuitry. |
| Max Junction Temperature | 125°C - guarantees reliable operation in under-hood automotive environments. |
| GATE Drive Capability | Pull-down current ≥75mA - ensures rapid MOSFET turn-off during faults to prevent SOA violation. |
Pinout & Package
LT4356CDE-1#PBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed pad (Pin 13), rated for 0°C to 70°C operation. The exposed pad may be left unconnected or tied to GND for thermal enhancement.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Auxiliary amplifier non-inverting input | Configurable as comparator or linear regulator controller; clamped to 7V max; connect to GND if unused. |
| 2 (AOUT) | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs/optocouplers; negative input internally referenced to 1.25V. |
| 3 (GND) | Device ground reference | Common return for all internal circuits; connects to PCB ground plane. |
| 4 (EN) | Open-collector enable output | High-impedance when OUT > VCC – 0.7V (MOSFET fully on); latched until OUT resets below 0.5V then rises above 2V. |
| 5 (FLT) | Open-collector fault indicator | Pulls low at VTMR = 1.25V (early warning); sinks up to 3mA from 80V; signals impending power-down. |
| 6 (SHDN) | Shutdown control input | TTL-compatible; pulls part into 7µA shutdown when <0.4V; withstands –60V to 100V; internal 4µA pull-up provided. |
| 7 (TMR) | Fault timer capacitor node | Charged by voltage-dependent current source; thresholds at 1.25V (FLT assert), 1.35V (GATE off), 0.5V (retry). |
| 8 (FB) | Voltage regulation feedback input | Servo point for 1.25V reference; connects to center tap of output divider; clamped to 7V; tie to GND to disable OV clamp. |
| 9 (OUT) | MOSFET source voltage sense | Senses VDS for TMR current scaling; EN latches when OUT > VCC – 0.7V; used in divider for FB loop. |
| 10 (GATE) | N-channel MOSFET gate driver | Charge-pump driven; clamped to VOUT + 14V; pulls down ≥75mA during OV/OC faults for fast turn-off. |
| 11 (SNS) | Current sense input | Monitors voltage drop between VCC and SNS; limits ΔVSNS to 50mV; tolerates –60V to VCC + 0.3V. |
| 12 (VCC) | Main supply input | 4V–80V operating range; withstands –60V reverse battery; powers internal circuitry and charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timing | TMR current scales with VDS (2–50µA for OV, 4–260µA for OC), ensuring MOSFET stays within SOA during combined high-V/high-I stress. |
| Reverse input protection | VCC and SHDN pins tolerate –60V, eliminating need for external reverse-battery diodes in automotive front-end designs. |
| Low-power shutdown | 7µA quiescent current in shutdown mode preserves battery life in always-on vehicle subsystems. |
| Dual-fault detection | Independent overvoltage (via FB servo) and overcurrent (via 50mV SNS threshold) protection with distinct TMR charging profiles. |
| Back-to-back FET support | Enables replacement of Schottky diodes with two N-FETs for near-zero forward drop and bidirectional reverse blocking. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Supply |
|---|---|
|
Use Scenario: Protecting infotainment ECUs during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: Regulates output to safe clamp voltage (e.g., 27V) by servoing external N-FET gate; TMR adapts timing to VDS to avoid MOSFET destruction. Use Value: Enables uninterrupted operation during short transients while guaranteeing MOSFET survival during sustained overvoltage. |
Use Scenario: Safely inserting powered modules into live backplane systems without causing bus glitches or damage. IC Role / Device Role / Timing Role: Controls inrush current via soft-start-like GATE ramp; detects overcurrent during plug-in and initiates controlled shutdown. Use Value: Prevents voltage sag and arcing at connectors, extends connector life, and avoids system reset during hot insertion. |
| Battery-Powered High-Side Switch | Intrinsic Safety Barrier |
|
Use Scenario: Isolating sensitive sensors in portable test equipment powered by Li-ion batteries (3.0–4.2V nominal, up to 80V surge). IC Role / Device Role / Timing Role: Acts as programmable high-side switch with reverse polarity and overvoltage lockout; SHDN pin controls enable/disable. Use Value: Eliminates need for discrete P-FET + Zener + op-amp solutions; reduces BOM count and PCB area while improving reliability. |
Use Scenario: Powering field instruments in hazardous areas where energy limitation is mandated per IEC 60079-11. IC Role / Device Role / Timing Role: Limits fault energy by rapidly turning off pass FET during overvoltage/overcurrent; TMR ensures bounded fault duration. Use Value: Meets entity parameter requirements (e.g., <100mJ fault energy) without external crowbar circuits or fuses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365CDDB#TRPBF | Lower voltage range (4.5V–34V); integrated MOSFET; no TMR adaptivity; fixed 2.5ms OV response. | Better suited for 24V industrial systems with lower surge levels; not rated for 80V automotive load dump. | Select LTC4365 when board space is critical and 34V max input suffices; avoid for 12V automotive front-end use. |
| TPS26631PWPR | Fixed 28V OV clamp; no adjustable current limit; 1.2A integrated FET; no reverse input rating. | Targeted at USB PD and PoE-powered devices; lacks –60V reverse tolerance and adaptive timing for harsh environments. | Choose TPS26631 for cost-sensitive, low-current (<1.2A) applications where 28V clamping and simplicity outweigh ruggedness needs. |
Compared with LTC4365 and TPS26631, the LT4356CDE-1#PBF uniquely combines 80V operation, –60V reverse tolerance, adaptive TMR timing, and external high-current N-FET drive-making it the only option qualified for demanding automotive load dump and intrinsic safety barrier roles.
Availability
LT4356CDE-1#PBF is available at Aetrix Electronics and suitable for automotive surge protection, hot-swap power supplies, and battery-powered high-side switching applications requiring stable component supply, long-term lifecycle assurance, and guaranteed 0°C to 70°C performance.
Supply support for LT4356CDE-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LT4356CDE-1#PBF belongs to Analog Devices' Surge Stopper product line, engineered specifically for high-reliability transient protection in automotive, avionic, and industrial power systems where continuous operation during voltage surges is mandatory.
FAQ
What is the maximum reverse voltage the LT4356CDE-1#PBF can withstand on its VCC pin?
The LT4356CDE-1#PBF supports –60V on the VCC pin, allowing direct connection to reversed battery terminals without external protection diodes. This rating is absolute and applies across the full 0°C to 70°C operating temperature range. The SHDN pin shares the same –60V rating, enabling robust reverse-polarity handling in automotive front-end designs where LT4356CDE-1#PBF is deployed.
How does the LT4356CDE-1#PBF implement adaptive fault timing, and why is it important?
The LT4356CDE-1#PBF charges the TMR capacitor with a current proportional to VDS (VCC – OUT), ranging from 2µA to 50µA during overvoltage and 4µA to 260µA during overcurrent. This ensures shorter fault timers at higher VDS, keeping the external MOSFET within its Safe Operating Area. Without this adaptation, fixed-timer ICs risk MOSFET failure during high-stress transients-making LT4356CDE-1#PBF essential for automotive load dump protection.
Can the LT4356CDE-1#PBF be used with logic-level N-channel MOSFETs?
Yes-the LT4356CDE-1#PBF's GATE pin delivers ≥4.5V drive at VCC = 4V, making it compatible with logic-level N-channel MOSFETs in low-input-voltage applications such as cold-crank automotive scenarios. At higher VCC (e.g., 12V), GATE swings to VOUT + 10V typical, supporting standard-threshold FETs. Always verify RDS(on) and SOA curves of the selected MOSFET against expected fault conditions when using LT4356CDE-1#PBF.
What is the function of the EN pin on the LT4356CDE-1#PBF, and how is it used?
The EN pin on the LT4356CDE-1#PBF is an open-collector output that goes high-impedance when the OUT pin voltage exceeds VCC – 0.7V-indicating the external N-FET is fully enhanced and conducting. It remains latched in that state until OUT drops below 0.5V and then rises above 2V. Designers use EN to enable downstream regulators or signal microcontrollers that the protected rail is stable, directly leveraging LT4356CDE-1#PBF's real-time conduction status.
Does the LT4356CDE-1#PBF provide overcurrent protection, and how is the threshold set?
Yes-the LT4356CDE-1#PBF provides precise overcurrent protection by regulating the voltage difference between VCC and SNS pins to 50mV. This fixed threshold means the current limit is set solely by the sense resistor value (ILIMIT = 50mV / RSENSE). No external components are needed to configure the trip point, and the 50mV value remains stable across temperature and supply voltage-ensuring consistent protection behavior in LT4356CDE-1#PBF-based designs.
LT4356CDE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- 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:
- 12-DFN (4x3)
LT4356CDE-1#PBF FAQ
1.How can I place an order for LT4356CDE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CDE-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 LT4356CDE-1#PBF reliable?
The price and inventory of LT4356CDE-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 LT4356CDE-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CDE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CDE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CDE-1#PBF?
LT4356CDE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CDE-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 LT4356CDE-1#PBF?
For technical support, including LT4356CDE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CDE-1#PBF requirements.
6.How does Aetrix verify that LT4356CDE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CDE-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 LT4356CDE-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CDE-1#PBF?
All LT4356CDE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CDE-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 LT4356CDE-1#PBF part is unused and in its original packaging.
Return procedure for LT4356CDE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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