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Analog Devices Inc. LT4356HDE-3#TRPBF
- Part No.:
- LT4356HDE-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT4356HDE-3#TRPBF.pdf
- Description:
- IC REG OVP FAULT TIMER 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,061
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Product details
Overview
LT4356HDE-3#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during overvoltage transients (e.g., automotive load dump) and limiting current via external N-channel MOSFET control. It operates from 4V to 80V, features adjustable 1.25V FB threshold, 50mV overcurrent sense threshold, and −40°C to +125°C operating range. Used in automotive power distribution systems requiring latchoff fault protection.
For engineers reviewing the LT4356HDE-3#TRPBF datasheet, LT4356HDE-3#TRPBF pinout, LT4356HDE-3#TRPBF application, or LT4356HDE-3#TRPBF equivalent, key selection criteria include its 12-pin DFN package with exposed pad, AEC-Q100 qualification for automotive use, integrated fault timer with voltage-dependent current scaling, auxiliary amplifier for level detection or linear regulator control, and reverse input tolerance down to −60V.
Technical Context
The LT4356HDE-3#TRPBF implements dual-loop protection: a voltage servo loop using the FB pin to clamp output at 1.25V × (1 + R1/R2), and a current-sense loop limiting ΔVSNS = VCC − VSNS to 50mV. Its GATE driver uses an internal charge pump to deliver ≥10V gate drive above OUT, enabling standard-threshold N-MOSFETs.
Fault response is adaptive: TMR pin charging current scales with (VCC − OUT) - up to 50µA during overvoltage and 260µA during overcurrent - ensuring MOSFET safe operating area (SOA) compliance. FLT asserts low at VTMR = 1.25V for early warning; GATE latches off at VTMR = 1.35V unless reset via SHDN pin sequence.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V input; supports cold-crank operation and withstands −60V reverse battery |
| Overvoltage Clamp | Adjustable via FB divider; regulated to 1.25V reference at FB pin |
| Overcurrent Threshold | 50mV ΔVSNS (VCC − VSNS); enables precise current limiting with external sense resistor |
| Fault Timer Current | 2µA–50µA (OV) or 4µA–260µA (OC), proportional to (VCC − OUT); ensures SOA-aware timing |
| Shutdown Current | ≤7µA at −40°C to +125°C; enables ultra-low-power system standby |
| Operating Temp | −40°C to +125°C; qualified per AEC-Q100 Grade H for under-hood automotive use |
| Package | 12-lead 4mm × 3mm DFN with optional exposed pad; θJA = 43°C/W |
Pinout & Package
LT4356HDE-3#TRPBF is housed in a 12-lead (4mm × 3mm) plastic DFN package with exposed pad (Pin 13), rated for TJMAX = 125°C and θJA = 43°C/W. The exposed pad may be left floating or connected to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Auxiliary amplifier non-inverting input | Configurable as comparator or PNP linear regulator controller; clamped to 7V max |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; drives LEDs or optocouplers directly |
| GND | Device ground reference | Common return for all analog and power circuits; connects to exposed pad optionally |
| EN | Open-collector enable indicator | High-impedance when MOSFET is fully on (VOUT > VCC − 0.7V); latched until reset |
| FLT | Open-collector fault indicator | Pulls low at VTMR = 1.25V; signals impending shutdown due to OV/OC condition |
| SHDN | Active-low shutdown control | Withstands −60V to +100V; requires >10V/ms slew rate and 100µs low pulse to reset latch |
| TMR | Fault timer capacitor connection | Charged by voltage-dependent current source; thresholds at 1.25V (warning) and 1.35V (shutdown) |
| FB | Voltage regulation feedback input | Internal 1.25V reference; sets output clamp voltage via external resistor divider |
| OUT | MOSFET source voltage sense | Senses VDS across external N-MOSFET; enables adaptive fault timing and EN status |
| GATE | N-MOSFET gate drive output | Charge-pump driven; clamped to 10V–16V above OUT; delivers 150mA pull-down during OV fault |
| SNS | Current sense input | Monitors VCC − VSNS; limits sense voltage to 50mV; tolerates −60V below GND |
| VCC | Main supply input | 4V–80V operation; supplies internal circuitry and charge pump; withstands −60V reverse |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive fault timing | TMR current scales with (VCC − OUT), matching MOSFET SOA requirements across voltage and temperature |
| Reverse input protection | Withstands −60V at VCC/SNS/SHDN pins; enables back-to-back FET replacement of Schottky diodes |
| Dual protection loops | Independent voltage regulation (via FB) and current limiting (via SNS) with shared fault timer and latchoff |
| Auxiliary amplifier | Integrated op-amp with 1.25V internal reference on IN−; supports level detection or PNP linear regulator control |
| AEC-Q100 Grade H | Qualified for −40°C to +125°C operation; meets automotive reliability and stress-test requirements |
| Low shutdown current | ≤7µA quiescent current in shutdown mode; critical for always-on automotive subsystems |
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: Surge stopper regulating output to safe clamp voltage while controlling external N-MOSFET gate; fault timer provides 93.75ms/µF total shutdown delay. Use Value: Enables uninterrupted operation during short transients and prevents MOSFET thermal runaway during sustained overvoltage. |
Use Scenario: Safely inserting powered modules into live 24V industrial backplanes without bus disturbance. IC Role / Device Role / Timing Role: High-side switch with soft-start and overcurrent limiting; EN pin confirms MOSFET turn-on before system enable. Use Value: Eliminates inrush current spikes and provides immediate short-circuit shutdown with <4µs response time. |
| Battery-Powered System High-Side Switch | Reverse Polarity Protected Power Supply |
Use Scenario: Controlling power to safety-critical sensors in rail or avionics systems with wide input range (5V–72V). IC Role / Device Role / Timing Role: High-side N-MOSFET controller with cold-crank support (down to 4V) and latchoff fault management. Use Value: Maintains functionality during engine start-up dips while preventing damage from sustained overvoltage faults. |
Use Scenario: Replacing Schottky diode in 48V telecom power entry with lower forward drop and no thermal derating. IC Role / Device Role / Timing Role: Enabling back-to-back N-MOSFET configuration via SHDN and GATE control; reverse voltage tolerance to −60V. Use Value: Reduces conduction loss by >75% vs. Schottky, improves efficiency, and eliminates diode self-heating issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356IDE-3#TRPBF | Same architecture and pinout; rated for −40°C to +85°C (not automotive-grade) | Lacks AEC-Q100 qualification; unsuitable for under-hood deployment | Select only for commercial/industrial environments where extended temperature is not required. |
| LT4356HMS-3#WTRPBF | Identical electrical specs and temp grade; packaged in 10-lead MSOP instead of DFN | Higher θJA (160°C/W) and smaller thermal pad; less suitable for high-power dissipation | Choose when board space constraints favor MSOP or when legacy layout re-use is prioritized over thermal performance. |
Compared with LT4356IDE-3#TRPBF, the LT4356HDE-3#TRPBF adds AEC-Q100 qualification and extended high-temp operation essential for automotive use; compared with LT4356HMS-3#WTRPBF, it offers superior thermal resistance and compact DFN footprint for space-constrained, high-reliability designs.
Availability
LT4356HDE-3#TRPBF is available at Aetrix Electronics and suitable for automotive load dump protection, hot-swap power distribution, and battery-powered high-side switching applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT4356HDE-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 automotive, industrial, communications, and healthcare markets.
The LT4356 family is designed as automotive-grade surge stoppers for high-reliability power path protection, emphasizing latchoff fault management, reverse polarity resilience, and MOSFET SOA optimization in harsh environments.
FAQ
What is the maximum reverse voltage the LT4356HDE-3#TRPBF can withstand?
The LT4356HDE-3#TRPBF withstands −60V at VCC, SNS, and SHDN pins during reverse battery conditions without damage. This allows direct integration into automotive systems without external reverse-protection diodes. The device maintains functional integrity and does not latch or degrade under this stress, making it suitable for 12V and 24V vehicle architectures with bidirectional fault exposure. The LT4356HDE-3#TRPBF specification is verified per AEC-Q100 stress testing protocols.
How does the LT4356HDE-3#TRPBF implement adaptive fault timing?
The LT4356HDE-3#TRPBF charges the TMR capacitor with a current proportional to (VCC − OUT), ranging from 2µA to 50µA during overvoltage and 4µA to 260µA during overcurrent. This ensures shorter fault delays at higher VDS, keeping MOSFET operation within its safe operating area (SOA). The LT4356HDE-3#TRPBF's design avoids fixed-timer limitations by dynamically matching timing to actual power dissipation stress. No external compensation is needed beyond selecting CTMR per datasheet equations.
Can the LT4356HDE-3#TRPBF drive logic-level MOSFETs at low supply voltages?
Yes - the LT4356HDE-3#TRPBF guarantees ≥4.5V gate drive above OUT when VCC ≥ 4V, enabling reliable turn-on of logic-level N-channel MOSFETs during cold-crank (e.g., 5V battery). At VCC ≥ 8V, gate drive increases to 10V–16V, supporting standard-threshold devices. The LT4356HDE-3#TRPBF's charge pump architecture ensures sufficient gate voltage headroom across its full 4V–80V operating range, eliminating need for external level shifters.
What is the function of the auxiliary amplifier in the LT4356HDE-3#TRPBF?
The LT4356HDE-3#TRPBF integrates an auxiliary amplifier with its inverting input tied to an internal 1.25V reference. It can be configured as a precision level-detection comparator (using IN+ and AOUT) or as a linear regulator controller driving an external PNP pass transistor. AOUT sinks up to 2mA from 80V, allowing direct LED or optocoupler interfacing. This feature adds system-level monitoring capability without requiring a separate op-amp, reducing BOM count and board area.
How is the LT4356HDE-3#TRPBF reset after a fault-induced latchoff?
After GATE latches off due to TMR reaching 1.35V, the LT4356HDE-3#TRPBF requires a specific SHDN sequence: pull SHDN low for ≥100µs, then raise it above 2.1V with a slew rate >10V/ms. This resets both the fault latch and internal logic. Simply cycling VCC or removing the fault condition is insufficient. The LT4356HDE-3#TRPBF datasheet specifies this exact timing and edge-rate requirement to prevent unintended reactivation during transient recovery.
LT4356HDE-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)
LT4356HDE-3#TRPBF FAQ
1.How can I place an order for LT4356HDE-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HDE-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 LT4356HDE-3#TRPBF reliable?
The price and inventory of LT4356HDE-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 LT4356HDE-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356HDE-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HDE-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HDE-3#TRPBF?
LT4356HDE-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HDE-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 LT4356HDE-3#TRPBF?
For technical support, including LT4356HDE-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HDE-3#TRPBF requirements.
6.How does Aetrix verify that LT4356HDE-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356HDE-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 LT4356HDE-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356HDE-3#TRPBF?
All LT4356HDE-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HDE-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 LT4356HDE-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356HDE-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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