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Analog Devices Inc. LT4356HS-3#TRPBF
- Part No.:
- LT4356HS-3#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356HS-3#TRPBF.pdf
- Description:
- IC REG OVP FAULT TIMER 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,212
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Product details
Overview
LT4356HS-3#TRPBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads by regulating output voltage during transients (e.g., automotive load dump) via external N-channel MOSFET gate control. It features adjustable 1.25 V feedback clamping, 50 mV overcurrent sense threshold, –40°C to 125°C operation, and reverse input protection to –60 V. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356HS-3#TRPBF datasheet, LT4356HS-3#TRPBF pinout, LT4356HS-3#TRPBF application, or LT4356HS-3#TRPBF equivalent, key selection criteria include fault timer programmability, 80 V max operating voltage, latchoff behavior under sustained overvoltage/overcurrent, SOIC-16 package thermal performance (θJA = 100°C/W), and AEC-Q100 qualification for automotive use.
Technical Context
The LT4356HS-3#TRPBF implements dual-fault protection: overvoltage regulation via FB-pin servoing to 1.25 V with dynamic TMR charging proportional to (VCC – VOUT), and overcurrent limiting via SNS-VCC differential sensing capped at 50 mV. Fault timing uses a single external capacitor on TMR, with early warning (FLT low at 1.25 V) followed by latchoff (GATE pulled low at 1.35 V).
It integrates an auxiliary amplifier (AOUT/IN+) referenced to 1.25 V for level detection or linear regulator control, and supports back-to-back FET reverse polarity protection. Shutdown current is <7 µA, SHDN tolerates –60 V to 100 V, and GATE drive is clamped to VOUT + 10 V minimum with 150 mA pull-down capability during fault.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4 V to 80 V - enables cold-crank operation and compatibility with 24 V/48 V industrial and automotive systems. |
| Overvoltage Clamp Threshold | Adjustable via FB divider; internal 1.25 V reference sets regulated output - allows precise output voltage setting independent of input surges. |
| Overcurrent Sense Threshold | 50 mV across SNS–VCC - provides accurate, temperature-stable current limiting without external gain components. |
| Fault Timer Thresholds | FLT asserts at 1.25 V on TMR; GATE latches off at 1.35 V - enables configurable early warning and hard shutdown timing. |
| Shutdown Quiescent Current | <7 µA - ensures minimal battery drain in always-on automotive modules during sleep mode. |
| Package Thermal Resistance | θJA = 100°C/W (SO-16) - supports continuous operation up to 125°C ambient with moderate PCB copper area. |
| AEC-Q100 Grade | Grade H (–40°C to +125°C) - qualified for under-hood automotive applications per stress test requirements. |
Pinout & Package
LT4356HS-3#TRPBF is housed in a 16-lead plastic SO package (S package) with exposed pad optional grounding. Pin count and layout match standard SOIC-16 footprint; maximum junction temperature is 150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TMR | Fault timer capacitor node | Charged by current source proportional to (VCC – VOUT) during faults; thresholds at 1.25 V (FLT) and 1.35 V (latchoff). |
| 2 FB | Voltage regulation feedback input | Servo point for 1.25 V internal reference; connects to resistive divider from OUT to GND to set clamp voltage. |
| 3 NC | No connect | Internally unused; must remain unconnected per datasheet. |
| 4 OUT | MOSFET source sense input | Senses voltage at N-MOSFET source; used for EN assertion and TMR current scaling during overvoltage. |
| 5 GATE | N-channel MOSFET gate driver output | Charge-pump-driven output clamped to VOUT + 10 V min; pulls down with 150 mA during OV/OC latchoff. |
| 6 NC | No connect | Internally unused; must remain unconnected. |
| 7 SNS | Current sense input | Monitors voltage drop between VCC and SNS; limits to 50 mV to enforce overcurrent protection. |
| 8 VCC | Main supply input | Operates from 4 V to 80 V; withstands –60 V reverse bias; powers all internal circuitry including charge pump. |
| 9 IN+ | Auxiliary amplifier non-inverting input | Connects to external signal for comparator or PNP regulator control; internally clamped to 7 V. |
| 10 NC | No connect | Internally unused; must remain unconnected. |
| 11 AOUT | Auxiliary amplifier output | Open-collector output sinking up to 2 mA from 80 V; referenced to internal 1.25 V. |
| 12 NC | No connect | Internally unused; must remain unconnected. |
| 13 GND | Device ground reference | Primary return path for internal logic, amplifiers, and fault timers; connects to system ground plane. |
| 14 EN | Enable status output | Open-collector output indicating MOSFET fully on (high-Z when VOUT > VCC – 0.7 V); sinks up to 3 mA. |
| 15 FLT | Fault indicator output | Open-collector output pulled low at TMR = 1.25 V; sinks up to 3 mA from 80 V to signal impending shutdown. |
| 16 SHDN | Shutdown control input | TTL-compatible input; pulls part into <7 µA shutdown when <0.4 V; withstands –60 V to 100 V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable latchoff fault timer | Single external capacitor on TMR sets both early warning interval and total fault timeout - simplifies transient ride-through tuning without firmware. |
| Back-to-back FET reverse polarity protection | Enables replacement of Schottky diode with two N-MOSFETs - reduces forward drop from ~0.4 V to <50 mV and eliminates reverse leakage. |
| Dynamic SOA-aware fault timing | TMR charging current scales with (VCC – VOUT) - shortens fault timeout under high VDS, keeping MOSFET within safe operating area. |
| Integrated auxiliary amplifier | 1.25 V-referenced op-amp with AOUT/IN+ pins - supports standalone voltage monitoring or drives external PNP for precision linear regulation. |
| Robust input voltage tolerance | VCC withstands –60 V reverse and 100 V absolute max on SHDN - eliminates need for external TVS or series diodes in harsh automotive environments. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Protecting infotainment ECUs and ADAS sensors from 60 V/200 ms load dump transients in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Surge stopper regulating output to 13.5 V via external N-MOSFET while dynamically adjusting fault timer based on VDS. Use Value: Enables uninterrupted operation during transients and prevents MOSFET thermal runaway using SOA-optimized timing. |
Use Scenario: Safely inserting server blades into live backplanes without disrupting upstream 48 V DC power rails. IC Role / Device Role / Timing Role: High-side switch controller with programmable soft-start and overcurrent foldback. Use Value: Limits inrush current and isolates faults within 2 µs overcurrent response time, preserving system uptime. |
| Battery-Powered System High-Side Switch | Reverse Polarity Protected Power Supply |
|
Use Scenario: Controlling power to mission-critical payloads in UAVs and portable test equipment powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-quiescent-current (7 µA) enable/disable switch with EN status feedback and latchoff under overvoltage. Use Value: Extends battery life during standby and prevents damage from accidental 24 V connection to 12 V-rated loads. |
Use Scenario: Powering industrial controllers from unregulated 24 V supplies where reverse battery connection is possible. IC Role / Device Role / Timing Role: Reverse-input protector using back-to-back N-MOSFETs controlled by GATE and SHDN. Use Value: Achieves <50 mV forward drop vs. 0.35 V for Schottky diodes, improving efficiency and reducing heat in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-3#TRPBF | Lower voltage range (4.5 V to 40 V); integrated MOSFET driver only (no external FET control); no auxiliary amplifier. | Targeted at lower-voltage consumer electronics; lacks programmable latchoff timer and reverse-input tolerance beyond –40 V. | Choose LTC4365IMS-3#TRPBF for compact 40 V systems where integrated simplicity outweighs 80 V headroom and SOA-aware timing. |
| TPS26631PWPR | Fixed 28 V overvoltage clamp; no adjustable FB; integrated 120 mΩ FET; no reverse-input rating or TMR-based adaptive timing. | Designed for USB PD and PoE-powered devices; not rated for automotive AEC-Q100 or >40 V transients. | Choose TPS26631PWPR for cost-sensitive, fixed-threshold 24 V industrial I/O modules requiring minimal BOM count. |
Compared with LTC4365IMS-3#TRPBF and TPS26631PWPR, LT4356HS-3#TRPBF uniquely supports 80 V operation, AEC-Q100 Grade H qualification, adaptive fault timing tied to MOSFET VDS, and dual-function auxiliary amplifier - making it the only option for high-reliability automotive load dump protection with external FET flexibility.
Availability
LT4356HS-3#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial hot-swap systems, and battery-powered high-side switching applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LT4356HS-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 with precision power and protection solutions.
The LT4356 family is designed specifically for high-voltage transient suppression in automotive and industrial power systems, enabling robust load protection through external N-MOSFET control, adaptive fault timing, and wide-input-range operation.
FAQ
What is the maximum input voltage the LT4356HS-3#TRPBF can withstand?
The LT4356HS-3#TRPBF supports an operating voltage range of 4 V to 80 V on its VCC pin and can withstand reverse input voltages down to –60 V without damage. Its SHDN pin tolerates –60 V to 100 V, making it suitable for harsh automotive environments with load dump and reverse-battery conditions. This rating is confirmed across the full –40°C to +125°C temperature range.
How does the LT4356HS-3#TRPBF implement overvoltage protection?
The LT4356HS-3#TRPBF regulates output voltage during overvoltage events by servoing the FB pin to its internal 1.25 V reference, controlling the GATE pin to adjust the external N-MOSFET's conduction. When the TMR pin voltage reaches 1.25 V, FLT goes low as a warning; at 1.35 V, GATE is latched low to disconnect the load. The TMR charging current scales with (VCC – VOUT) to ensure MOSFET SOA compliance.
Does the LT4356HS-3#TRPBF support reverse polarity protection?
Yes - the LT4356HS-3#TRPBF enables reverse input protection using back-to-back N-channel MOSFETs instead of a Schottky diode. Its SHDN and VCC pins tolerate –60 V, and the GATE driver supports bidirectional control. This configuration reduces forward voltage drop to <50 mV and eliminates reverse leakage, improving efficiency and thermal performance in sealed systems.
What is the purpose of the auxiliary amplifier in the LT4356HS-3#TRPBF?
The auxiliary amplifier in the LT4356HS-3#TRPBF features IN+ and AOUT pins with an internal 1.25 V reference, allowing it to function either as a voltage detection comparator (e.g., battery undervoltage lockout) or as a linear regulator controller driving an external PNP pass transistor. It sinks up to 2 mA and operates independently of the main surge protection loop.
How is the fault timer configured on the LT4356HS-3#TRPBF?
The fault timer on the LT4356HS-3#TRPBF is set using an external capacitor connected between the TMR pin and GND. During overvoltage or overcurrent faults, a current source charges this capacitor; FLT asserts low at 1.25 V, and GATE latches off at 1.35 V. The charging current varies with (VCC – VOUT) to adapt timing to MOSFET stress - ensuring safe operation across the full 4 V to 80 V range.
LT4356HS-3#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- 16-SO
LT4356HS-3#TRPBF FAQ
1.How can I place an order for LT4356HS-3#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356HS-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 LT4356HS-3#TRPBF reliable?
The price and inventory of LT4356HS-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 LT4356HS-3#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356HS-3#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356HS-3#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356HS-3#TRPBF?
LT4356HS-3#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356HS-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 LT4356HS-3#TRPBF?
For technical support, including LT4356HS-3#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356HS-3#TRPBF requirements.
6.How does Aetrix verify that LT4356HS-3#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356HS-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 LT4356HS-3#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356HS-3#TRPBF?
All LT4356HS-3#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356HS-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 LT4356HS-3#TRPBF part is unused and in its original packaging.
Return procedure for LT4356HS-3#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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