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Analog Devices Inc. LT4356IDE-3#PBF
- Part No.:
- LT4356IDE-3#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356IDE-3#PBF.pdf
- Description:
- IC SURGE STOPPER W/LATCH 12-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,483
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Product details
Overview
LT4356IDE-3#PBF from Analog Devices is a surge protection controller that regulates output voltage during automotive load dump (up to 80V) by driving an external N-channel MOSFET, provides overcurrent protection via 50mV current-sense threshold, features adjustable latchoff fault timer with early warning (FLT pin), and operates across –40°C to +85°C in a 12-lead 4mm × 3mm DFN package for high-side battery protection in automotive and industrial power systems.
For engineers reviewing the LT4356IDE-3#PBF datasheet, LT4356IDE-3#PBF pinout, LT4356IDE-3#PBF application, or LT4356IDE-3#PBF equivalent, key selection considerations include its 4V–80V operating range, –60V reverse input tolerance, 7µA shutdown current, 1.25V FB reference, and fault timer current scaling with VDS for MOSFET SOA optimization.
Technical Context
The LT4356IDE-3#PBF implements dual-loop protection: a voltage amplifier servoing the FB pin to 1.25V during overvoltage events, and a current amplifier limiting ΔVSNS to 50mV during overcurrent faults. Both conditions charge the TMR capacitor with voltage-dependent current-2µA to 50µA for overvoltage, 4µA to 260µA for overcurrent-enabling adaptive fault timing aligned with MOSFET safe operating area.
It integrates a 7µA SHDN pull-up, supports back-to-back FET reverse polarity protection, and latches GATE off after fault timeout until SHDN is pulsed low (≥100µs) and re-ramped high (>10V/ms). The auxiliary amplifier (AOUT/IN+) functions as a 1.25V-referenced comparator or linear regulator controller.
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 transients. |
| Overcurrent Threshold | 50mV ΔVSNS - sets precise current limit independent of temperature via internal amplifier, reducing sense resistor power loss. |
| FB Reference Voltage | 1.25V (±2.5%) - defines regulated output clamp voltage via external resistive divider; stable over full temperature range. |
| Shutdown Current | <7µA - minimizes battery drain in always-on automotive systems when SHDN is pulled low. |
| Reverse Input Rating | –60V - allows direct connection to reverse-battery–tolerant inputs without external diode or circuitry. |
| TMR Early Warning Threshold | 1.25V - triggers FLT pin low to signal impending shutdown, enabling system-level backup before GATE turns off at 1.35V. |
| GATE Drive Range | 4.5V to 16V above OUT - ensures reliable turn-on of standard or logic-level N-channel MOSFETs across full VCC range. |
Pinout & Package
LT4356IDE-3#PBF is housed in a 12-lead 4mm × 3mm plastic DFN package with exposed pad (Pin 13), rated for –40°C to +85°C operation. The exposed pad may be left unconnected or tied to GND for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Accepts external voltage for level detection or PNP regulator control; clamped to 7V max. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs/optocouplers directly without external pull-up. |
| GND | Device ground reference | Common return for all internal circuits and external sense resistors. |
| EN | Open-collector enable status output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset by VOUT cycling. |
| FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V to warn of imminent shutdown; sinks up to 3mA from 80V. |
| SHDN | Active-low shutdown control | Withstands –60V to +100V; requires ≥100µs low pulse and >10V/ms rise to reset latched-off state. |
| TMR | Fault timer capacitor connection | Charged by voltage-dependent current (2–260µA) to set adaptive fault timing based on VDS. |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; connects to resistive divider to set output clamp voltage. |
| OUT | MOSFET source voltage sense | Senses VOUT to enable EN and set TMR charging current; referenced to GND. |
| GATE | N-channel MOSFET gate driver output | Charge-pump–driven output clamped to 14V above OUT; delivers up to 150mA pull-down during OV fault. |
| SNS | Current sense input | Monitors voltage drop between VCC and SNS; senses overcurrent when ΔVSNS exceeds 50mV. |
| VCC | Main supply input | Accepts 4V–80V input; tolerates –60V reverse bias; powers internal circuitry and charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timer | TMR current scales with VDS (2–260µA), dynamically shortening fault timeout under high-stress conditions to protect MOSFET SOA. |
| Reverse input protection | Withstands –60V on VCC/SNS/SHDN pins, enabling robust reverse-battery immunity without external Schottky diodes. |
| Low-quiescent shutdown | 7µA shutdown current allows integration into always-on automotive modules without excessive battery drain. |
| Dual protection loops | Independent voltage (FB servo) and current (SNS amplifier) regulation paths prevent simultaneous OV/OC interaction errors. |
| Auxiliary amplifier | Integrated 1.25V-referenced op-amp (AOUT/IN+) supports flexible functions: undervoltage lockout, precision biasing, or PNP linear regulation. |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs during 60V/200ms load dump events in 12V vehicle electrical systems. IC Role / Device Role / Timing Role: High-side surge stopper regulating output to 12–27V via external N-MOSFET while monitoring VDS-dependent fault timing. Use Value: Enables uninterrupted operation during transients and prevents MOSFET thermal runaway using adaptive TMR current scaling. |
Use Scenario: Safely inserting powered circuit cards into live backplanes in telecom or industrial rack systems. IC Role / Device Role / Timing Role: Inrush current limiter and overvoltage supervisor controlling gate of series N-MOSFET during plug-in. Use Value: Limits peak inrush via soft-start behavior and disables output within microseconds if input exceeds 80V or current exceeds 50mV threshold. |
| Battery-Powered System High-Side Switch | Reverse Polarity Protected Power Path |
|
Use Scenario: Enabling/disabling main battery power to motor controllers or sensors in portable medical devices. IC Role / Device Role / Timing Role: Precision high-side switch with programmable latchoff timer and 7µA shutdown for ultra-low-power standby. Use Value: Delivers <100ns overvoltage turn-off delay and maintains system availability during brief surges via adjustable clamp voltage. |
Use Scenario: Replacing Schottky diodes in 24V industrial PLC power inputs to reduce forward drop and heat generation. IC Role / Device Role / Timing Role: Controller for back-to-back N-MOSFETs providing bidirectional reverse-voltage blocking with <0.1V drop. Use Value: Eliminates 0.3–0.5V diode drop, increasing available load voltage and reducing thermal stress during continuous operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365CDDB#TRPBF | Fixed 28V overvoltage clamp; no adjustable FB; 2.7V–42V operating range; lacks auxiliary amplifier. | Best suited for simpler 24V systems where fixed clamp suffices and auxiliary functions are unnecessary. | Choose LTC4365 when design prioritizes compactness (6-lead DFN) and fixed OV threshold over programmability and dual-loop flexibility. |
| TPS26631PWPR | Integrated 80V MOSFET; fixed 32V OV clamp; no TMR-based adaptive timing; 1.5A max current rating. | Targets lower-current applications (<1.5A) where integrated FET simplifies layout but limits power handling. | Choose TPS26631 when board space is critical and load current stays below 1.5A, accepting fixed clamp and no SOA-adaptive timing. |
Compared with LTC4365CDDB#TRPBF and TPS26631PWPR, LT4356IDE-3#PBF offers field-programmable output clamping, MOSFET SOA–adaptive fault timing, and an auxiliary amplifier-making it uniquely suitable for high-reliability automotive and industrial systems requiring configurable protection and extended voltage range.
Availability
LT4356IDE-3#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, hot-swap power distribution, and battery-powered high-side switching requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LT4356IDE-3#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, and automotive safety markets.
The LT4356 family is designed for robust front-end power protection in harsh environments-specifically targeting automotive, avionic, and industrial systems needing wide-input surge suppression with MOSFET SOA awareness and latchoff control.
FAQ
What is the operating temperature range for the LT4356IDE-3#PBF?
The LT4356IDE-3#PBF is specified for operation from –40°C to +85°C, making it suitable for under-hood automotive applications and industrial environments with wide ambient temperature swings. This grade is denoted by the "I" suffix in the part number and is qualified per AEC-Q100 Grade 3 standards.
How does the LT4356IDE-3#PBF implement adaptive fault timing?
The LT4356IDE-3#PBF charges the external TMR capacitor with a current that scales linearly with the voltage across the external MOSFET (VDS). During overvoltage, current ranges from 2µA (at 0.5V VDS) to 50µA (at 75V VDS); during overcurrent, it ranges from 4µA to 260µA (at 80V VDS). This ensures shorter fault timeouts under higher stress, protecting MOSFET safe operating area.
Can the LT4356IDE-3#PBF drive logic-level MOSFETs at low supply voltages?
Yes-the LT4356IDE-3#PBF guarantees a minimum GATE drive of 4.5V above OUT when VCC ≥ 4V, enabling reliable turn-on of logic-level N-channel MOSFETs down to cold-crank conditions. At VCC ≥ 8V, GATE drive increases to 10–16V, supporting standard-threshold devices.
What is the function of the SHDN pin on the LT4356IDE-3#PBF?
The SHDN pin on the LT4356IDE-3#PBF is an active-low control that shuts down all internal circuitry-including GATE drive and auxiliary amplifier-reducing quiescent current to <7µA. It tolerates –60V to +100V and requires a ≥100µs low pulse followed by a >10V/ms rising edge to reset a latched-off GATE state.
Does the LT4356IDE-3#PBF include reverse polarity protection capability?
Yes-the LT4356IDE-3#PBF supports reverse input protection by enabling back-to-back N-channel MOSFET configurations. Its VCC, SNS, and SHDN pins tolerate –60V, allowing direct connection to reversed battery inputs without external diodes, thereby eliminating forward voltage drop and associated power loss.
LT4356IDE-3#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)
LT4356IDE-3#PBF FAQ
1.How can I place an order for LT4356IDE-3#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356IDE-3#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 LT4356IDE-3#PBF reliable?
The price and inventory of LT4356IDE-3#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356IDE-3#PBF is usually 5 days.
3.What payment methods are accepted for LT4356IDE-3#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356IDE-3#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356IDE-3#PBF?
LT4356IDE-3#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356IDE-3#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 LT4356IDE-3#PBF?
For technical support, including LT4356IDE-3#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356IDE-3#PBF requirements.
6.How does Aetrix verify that LT4356IDE-3#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356IDE-3#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 LT4356IDE-3#PBF meets industry standards.
7.What is the process for return or replacement of LT4356IDE-3#PBF?
All LT4356IDE-3#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356IDE-3#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 LT4356IDE-3#PBF part is unused and in its original packaging.
Return procedure for LT4356IDE-3#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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