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Analog Devices Inc. LT4356CDE-3#TRPBF
- Part No.:
- LT4356CDE-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356CDE-3#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,570
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Product details
Overview
LT4356CDE-3#TRPBF from Analog Devices is a surge protection controller IC that regulates output voltage during automotive load dump and other high-voltage transients by driving an external N-channel MOSFET. It features adjustable overvoltage clamping (via FB pin), 50mV overcurrent sensing at SNS, fault latching with timer-based shutdown, and reverse input protection to –60V. Used in 12V/24V automotive power distribution systems requiring uninterrupted operation under transient stress.
For engineers reviewing the LT4356CDE-3#TRPBF datasheet, LT4356CDE-3#TRPBF pinout, LT4356CDE-3#TRPBF application, or LT4356CDE-3#TRPBF equivalent, key selection criteria include its 4V–80V operating range, 7µA shutdown current, 12-lead DFN package with exposed pad, AEC-Q100 qualification for commercial temperature grade (0°C to 70°C), and integrated auxiliary amplifier for level detection or linear regulator control.
Technical Context
The LT4356CDE-3#TRPBF implements dual-fault protection: overvoltage regulation via feedback-controlled GATE drive to maintain 1.25V at FB (corresponding to user-defined clamp voltage), and overcurrent limiting by servoing VCC–VSNS to 50mV. Fault timing is dynamically scaled by (VCC–VOUT) to match MOSFET safe operating area (SOA) requirements.
It integrates a charge pump gate driver (ΔVGATE = 4.5V to 16V), open-collector FLT and EN outputs rated to sink 3mA from 80V, SHDN input tolerant to –60V to 100V, and an auxiliary amplifier (AOUT/IN+) referenced to internal 1.25V. The device latches off after fault timeout and requires active SHDN reset with >10V/ms slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - supports cold-crank operation and withstands automotive load dump surges up to 80V. |
| Overcurrent Threshold | 50mV across sense resistor - enables precise, adjustable current limiting without external gain stages. |
| FB Reference Voltage | 1.25V ±25mV - sets output clamp voltage via resistive divider; stable over full temperature range. |
| Shutdown Current | <7µA - enables ultra-low-power system-level sleep modes in battery-backed applications. |
| Reverse Input Rating | –60V on VCC and SHDN - allows direct connection to reverse-battery-protected automotive inputs. |
| Package | 12-lead 4mm × 3mm DFN with exposed pad - thermally optimized for high-power dissipation in compact layouts. |
| Temperature Range | 0°C to 70°C - commercial-grade variant suitable for cabin-located ECUs and non-under-hood modules. |
Pinout & Package
LT4356CDE-3#TRPBF is housed in a 12-lead plastic DFN package (4mm × 3mm) with exposed thermal pad (Pin 13), rated for θJA = 43°C/W. The exposed pad may be left unconnected or tied to PCB ground for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Accepts external voltage for comparator or regulator control; clamped to 7V max; unused must be grounded. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs, optocouplers, or PNP pass transistors. |
| GND | Device ground reference | Primary return path for internal circuitry and external sense resistor; connects to exposed pad optionally. |
| EN | Open-collector enable status output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until OUT resets. |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V (early warning); remains low until SHDN reset sequence completes. |
| SHDN | Active-low shutdown control | TTL-compatible threshold (0.4V–2.1V); withstands –60V to 100V; internal 7µA pull-up provided. |
| TMR | Fault timer capacitor connection | Charged by voltage-dependent current source; 1.25V = FLT assert, 1.35V = GATE latch-off. |
| FB | Voltage regulation feedback input | Internal 1.25V reference point; connect to resistive divider to set output clamp voltage. |
| OUT | MOSFET source voltage sense | Senses VDS for SOA-aware timing; triggers EN state change at VCC – VOUT = 0.7V. |
| GATE | N-MOSFET gate drive output | Charge-pump driven; clamped to VOUT + 10V min / +16V max; pulls down with 150mA (OV) or 10mA (OC). |
| SNS | Current sense input | Monitors VCC–VSNS; limits differential to 50mV; tolerates –60V below GND if VCC–VSNS < 30V. |
| VCC | Main supply input | 4V–80V operation; reverse-rated to –60V; powers all internal blocks including charge pump and amplifiers. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer | Timer current scales with (VCC–VOUT) - ensures MOSFET stays within SOA during both overvoltage and overcurrent faults. |
| Back-to-back FET reverse protection | Enables replacement of Schottky diode with two N-MOSFETs - reduces forward drop and power loss vs. diode solution. |
| Integrated auxiliary amplifier | 1.25V-referenced op-amp (IN+/AOUT) - supports standalone voltage monitoring or linear regulator control without external references. |
| Robust pin ratings | SHDN and VCC tolerate –60V to 100V - eliminates need for external TVS or level-shifting in harsh automotive environments. |
| Latched fault response | GATE remains off after timeout until SHDN reset with defined slew rate - prevents uncontrolled restart during persistent faults. |
Applications
| Automotive Power Distribution | Hot-Swap Server Backplane |
|---|---|
|
Use Scenario: Protecting infotainment head units and ADAS sensors from 80V load dump transients in 12V/24V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output voltage via external N-MOSFET; provides 100ms+ ride-through for short transients while latching off for sustained overvoltage. Use Value: Enables continuous operation during ISO 7637-2 Pulse 5a events without brownout or component damage; eliminates need for bulky TVS arrays. |
Use Scenario: Safely inserting or removing PCIe cards or storage modules into live 12V backplanes without causing bus glitches or inrush damage. IC Role / Device Role / Timing Role: High-side switch controller with programmable current limit and soft-start behavior via TMR capacitor tuning. Use Value: Limits inrush current to <500mA during insertion, prevents supply sag on shared rail, and avoids false triggering of upstream OCP circuits. |
| Battery-Powered Industrial Equipment | Avionics Power Conditioning |
|
Use Scenario: Securing PLC I/O modules powered from 24V lead-acid batteries subject to alternator spikes and accidental reverse polarity connection. IC Role / Device Role / Timing Role: Dual-protection controller providing overvoltage clamping, overcurrent limiting, and –60V reverse-input tolerance. Use Value: Replaces discrete protection circuits (TVS + MOSFET + op-amp) with single IC; reduces BOM count by 7 components and PCB area by 45%. |
Use Scenario: Conditioning 28V DC power in aircraft subsystems exposed to MIL-STD-704F transient profiles including 100V surges. IC Role / Device Role / Timing Role: Transient suppressor with AEC-Q100-compliant reliability and extended SOA-aware fault timing for critical avionics loads. Use Value: Meets DO-160 Section 22 Level 3 surge immunity with <10µs response time and no latch-up under repeated 100V/50ms transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356IDE-3#TRPBF | Wider temperature range (–40°C to 85°C); identical electrical specs and pinout. | Required for under-hood automotive modules or industrial equipment operating in extended ambient conditions. | Select when ambient operating temperature exceeds 70°C or AEC-Q100 Grade I compliance is mandatory. |
| LT4356HDE-3#TRPBF | Extended temperature range (–40°C to 125°C); same package and functionality; higher thermal rating. | Suitable for engine control units and transmission control modules where junction temperatures reach 125°C. | Choose for high-reliability automotive applications demanding Grade H qualification and enhanced SOA margin at elevated temperatures. |
Compared with LT4356CDE-3#TRPBF, the LT4356IDE-3#TRPBF offers broader thermal operation without layout or schematic changes, while the LT4356HDE-3#TRPBF adds high-temperature robustness for mission-critical power rails - both retain identical fault timing, gate drive strength, and protection thresholds.
Availability
LT4356CDE-3#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, hot-swap server backplanes, and battery-powered industrial equipment requiring stable component supply across production lifecycles.
Supply support for LT4356CDE-3#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 precision surge stoppers for high-reliability power systems - delivering dynamic fault timing, reverse-input resilience, and integrated amplifiers to simplify robust front-end protection in harsh environments.
FAQ
What is the maximum allowable reverse voltage on the VCC pin of the LT4356CDE-3#TRPBF?
The LT4356CDE-3#TRPBF supports –60V on the VCC pin relative to GND, enabling direct connection to reverse-battery-protected automotive inputs without external diodes or protection circuitry. This rating is specified in the Absolute Maximum Ratings table and applies across the full 0°C to 70°C operating temperature range. The SHDN pin shares this –60V to 100V tolerance, making the LT4356CDE-3#TRPBF uniquely suited for unidirectional reverse-polarity protection schemes using back-to-back N-MOSFETs.
How does the LT4356CDE-3#TRPBF implement SOA-aware fault timing?
The LT4356CDE-3#TRPBF implements SOA-aware fault timing by generating a TMR charging current proportional to (VCC – VOUT). During overvoltage faults, this current ranges from ~2µA at 0.5V VDS to 50µA at 75V VDS; during overcurrent faults, it scales from ~4µA to 260µA. This ensures shorter fault timeouts at higher VDS, keeping the external MOSFET within its safe operating area. The LT4356CDE-3#TRPBF datasheet provides detailed curves (Figures 1 and 2) showing this relationship across voltage and temperature.
Can the auxiliary amplifier in the LT4356CDE-3#TRPBF be used to monitor a 5V rail?
Yes, the auxiliary amplifier in the LT4356CDE-3#TRPBF can monitor a 5V rail using the IN+ and AOUT pins. With its internal 1.25V reference connected to the inverting input, the amplifier functions as a comparator: applying 5V to IN+ via a resistive divider (e.g., 3.9kΩ/1.0kΩ) yields 1.02V at IN+, below the 1.25V threshold, causing AOUT to remain high-impedance. Exceeding the threshold pulls AOUT low. The LT4356CDE-3#TRPBF's IN+ pin is clamped to 7V, allowing direct interface with 5V logic without external attenuation.
What is the required reset sequence to recover the LT4356CDE-3#TRPBF after a latched fault?
To recover the LT4356CDE-3#TRPBF after a latched fault, the SHDN pin must be pulled low for ≥100µs, then transitioned high with a slew rate >10V/ms. This sequence clears the internal latch and re-enables GATE drive. The TMR pin must first discharge to ≤0.5V (typical discharge current is 2.2µA), which takes ~22ms with a 100nF capacitor. The LT4356CDE-3#TRPBF will not restart automatically - active SHDN intervention is mandatory, preventing unsafe re-engagement during persistent overvoltage or overcurrent conditions.
Does the LT4356CDE-3#TRPBF require an external charge pump capacitor?
No, the LT4356CDE-3#TRPBF integrates a self-contained charge pump for GATE drive and requires no external capacitors. Its internal oscillator (ƒ = 250kHz) and charge pump circuitry generate the necessary gate voltage boost (ΔVGATE = 4.5V to 16V above VOUT) directly from VCC. This eliminates board space and BOM cost associated with external flying capacitors, simplifying layout and improving reliability - a key differentiator versus discrete MOSFET driver solutions requiring external pump components.
LT4356CDE-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 12-WFDFN Exposed Pad
- 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:
- 12-DFN (4x3)
LT4356CDE-3#TRPBF FAQ
1.How can I place an order for LT4356CDE-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CDE-3#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 LT4356CDE-3#TRPBF reliable?
The price and inventory of LT4356CDE-3#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356CDE-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356CDE-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CDE-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CDE-3#TRPBF?
LT4356CDE-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CDE-3#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 LT4356CDE-3#TRPBF?
For technical support, including LT4356CDE-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CDE-3#TRPBF requirements.
6.How does Aetrix verify that LT4356CDE-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356CDE-3#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 LT4356CDE-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356CDE-3#TRPBF?
All LT4356CDE-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CDE-3#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 LT4356CDE-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356CDE-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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