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Analog Devices Inc. LT4356IS-1#TRPBF
- Part No.:
- LT4356IS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356IS-1#TRPBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,563
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Product details
Overview
LT4356IS-1#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 provides overvoltage clamping (adjustable via FB divider), 50 mV current-sense threshold, 7 µA shutdown quiescent current, and operates from 4 V to 80 V input. It is used in automotive power distribution systems requiring uninterrupted operation under transient stress.
For engineers reviewing the LT4356IS-1#TRPBF datasheet, LT4356IS-1#TRPBF pinout, LT4356IS-1#TRPBF application, or LT4356IS-1#TRPBF equivalent, key selection criteria include its –40°C to 85°C temperature grade, SO-16 package, adjustable fault timer, reverse input protection to –60 V, and compatibility with back-to-back FET reverse polarity schemes.
Technical Context
The LT4356IS-1#TRPBF implements dual-loop protection: a voltage amplifier servoing the GATE pin to maintain 1.25 V at FB during overvoltage, and a current-sense amplifier limiting ΔVSNS to 50 mV across the sense resistor. Fault detection triggers a TMR capacitor-based timer whose charging current scales with (VCC – VOUT), enabling adaptive response to MOSFET stress levels.
It features an internal charge pump driving the GATE pin up to 14 V above OUT, supports shutdown with <7 µA ICC, and includes an open-collector FLT output for early fault warning (at VTMR = 1.25 V) before full turn-off (at VTMR = 1.35 V). The SHDN pin withstands –60 V to 100 V and retains TTL-compatible thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4 V to 80 V - enables operation during automotive cold crank (≥4 V) and withstands load dump surges (≤80 V). |
| Shutdown Quiescent Current | 7 µA - ensures ultra-low power consumption in standby, critical for always-on vehicle subsystems. |
| Current Sense Threshold | 50 mV - sets precise overcurrent trip point independent of supply voltage, minimizing sense resistor power loss. |
| FB Reference Voltage | 1.25 V ±2.5% - defines regulated output clamp voltage via external resistive divider (e.g., 27 V clamp with 102k/4.99k). |
| Reverse Input Protection | –60 V - allows direct connection to reversed battery without damage, eliminating need for external Schottky diode. |
| Temperature Range | –40°C to +85°C - qualified for industrial and automotive under-hood applications per LT4356I grade. |
| GATE Drive Capability | Pull-down: 150 mA (OV), 10 mA (OC); Pull-up: –4 µA to –50 µA - actively controls external N-MOSFET with fast turn-off for SOA compliance. |
Pinout & Package
LT4356IS-1#TRPBF is housed in a 16-lead plastic SO package (SO-16), with exposed thermal pad not present. Pin functions are defined per Analog Devices Rev. D datasheet and validated for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault Timer Input | Capacitor-connected node controlling early warning (1.25 V) and turn-off (1.35 V) timing; current scales with (VCC – VOUT) for MOSFET SOA optimization. |
| FB | Output Voltage Feedback | Servo input for overvoltage regulation; internal 1.25 V reference enables adjustable clamp (e.g., 27 V) using external resistor divider. |
| OUT | MOSFET Source Sense | Monitors source voltage of external N-MOSFET to detect VCC–OUT differential and enable EN latching and TMR charging. |
| GATE | N-MOSFET Gate Driver | Charge-pump-driven output clamped to 14 V above OUT; regulates MOSFET conduction to limit voltage or current. |
| SNS | Current Sense Input | Inputs voltage drop across external sense resistor; amplifier holds VCC–VSNS at 50 mV to enforce current limit. |
| VCC | Main Supply Input | Accepts 4 V–80 V operating range; withstands –60 V reverse bias; powers internal circuitry and charge pump. |
| SHDN | Shutdown Control | TTL-compatible input; pulls device into <7 µA shutdown state; rated for –60 V to 100 V, enabling robust system-level control. |
| FLT | Fault Indicator Output | Open-collector output pulling low at VTMR = 1.25 V to signal impending power-down; sinks up to 3 mA from 80 V. |
| EN | Enable Status Output | Open-collector output high-impedance when MOSFET is fully on (VOUT > VCC – 0.7 V); latched until reset by VOUT cycling. |
| IN+ | Auxiliary Amp Positive Input | Input for level detection comparator or linear regulator controller; internally clamped to 7 V; unused must be grounded. |
| AOUT | Auxiliary Amp Output | Open-collector amplifier output sinking up to 2 mA from 80 V; usable for UVLO or PNP-based linear regulation. |
| GND | Device Ground | Reference node for all internal circuits and sense amplifiers; connects to system ground plane. |
| NC | No Connect | Pins 3, 6, 12 - unconnected die pads; no electrical function; must remain floating or grounded per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Overvoltage Clamp | Set via FB resistive divider; maintains 1.25 V reference to enable precise, application-specific output limiting (e.g., 27 V for 12 V systems). |
| Adaptive Fault Timer | TMR charging current scales with (VCC – VOUT), shortening fault timeout under high MOSFET stress to protect SOA during sustained transients. |
| Back-to-Back FET Support | Enables reverse polarity protection using two N-MOSFETs instead of Schottky diode, reducing forward drop and improving efficiency. |
| Robust Shutdown Interface | SHDN tolerates –60 V to 100 V and features internal 4 µA pull-up; supports direct connection to battery rails without external level-shifting. |
| Dual Fault Detection | Independent overvoltage (FB loop) and overcurrent (SNS loop) monitoring with shared TMR timing and distinct FLT signaling. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: 12 V automotive ECU subjected to ISO 7637-2 load dump transients up to 60 V for 200 ms. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27 V via external N-MOSFET while maintaining continuous load operation. Use Value: Prevents downstream DC-DC converter damage and avoids system reset during transient events. |
Use Scenario: Programmable logic controller (PLC) backplane requiring live insertion of I/O modules without bus disruption. IC Role / Device Role / Timing Role: High-side switch controlling module power-up sequence with controlled inrush and fault isolation. Use Value: Enables zero-downtime maintenance and prevents brownout on shared 24 V rail during hot-plug events. |
| Intrinsic Safety Barriers | Battery-Powered System Reverse Polarity Protection |
|
Use Scenario: Hazardous-area sensor transmitter powered from intrinsically safe (IS) barrier with strict energy limits. IC Role / Device Role / Timing Role: Current-limited pass element enforcing 50 mV sense threshold and adaptive fault timing to stay within IS energy caps. Use Value: Guarantees fault energy remains below ignition threshold even during prolonged overvoltage conditions. |
Use Scenario: Portable medical device powered by removable Li-ion battery packs prone to reverse insertion. IC Role / Device Role / Timing Role: Controls back-to-back N-MOSFET pair to block reverse current while minimizing forward voltage drop. Use Value: Eliminates 0.3–0.5 V Schottky diode loss, extending runtime and avoiding thermal derating in compact enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356IS-2#TRPBF | 60 µA shutdown current vs. 7 µA; auxiliary amplifier remains active in shutdown; no IN+/AOUT disable option. | Preferred where undervoltage lockout or always-on monitoring is required during standby (e.g., telematics wake-on-LIN). | Select LT4356IS-2#TRPBF only if auxiliary amplifier functionality during shutdown is mandatory; otherwise LT4356IS-1#TRPBF offers lower quiescent power. |
| TPS26631PWPR | Integrated 80 V MOSFET; fixed 32 V overvoltage clamp; no adjustable TMR; 1.5 A max continuous current. | Suitable for space-constrained designs needing single-chip solution but lacking field-adjustable clamp or adaptive timing. | Choose TPS26631PWPR for simplified BOM and layout where programmability and SOA-optimized timing are secondary to integration. |
Compared with LT4356IS-2#TRPBF, the LT4356IS-1#TRPBF delivers superior standby efficiency for always-on systems, while TPS26631PWPR trades configurability for reduced component count-making LT4356IS-1#TRPBF optimal for high-reliability, field-tunable surge protection.
Availability
LT4356IS-1#TRPBF is available at Aetrix Electronics and suitable for automotive power distribution, industrial hot-swap subsystems, and intrinsic safety barriers requiring stable component supply, long-term lifecycle support, and guaranteed –40°C to +85°C operation.
Supply support for LT4356IS-1#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and automotive markets.
The LT4356 family is designed as high-voltage surge stoppers for mission-critical power rails, emphasizing robust transient immunity, MOSFET SOA protection, and flexible configuration across automotive, avionic, and industrial environments.
FAQ
What is the maximum input voltage the LT4356IS-1#TRPBF can withstand continuously?
The LT4356IS-1#TRPBF operates continuously from 4 V to 80 V on the VCC pin. Its absolute maximum rating allows VCC to reach 100 V transiently, but sustained operation above 80 V risks exceeding safe operating area limits and is not recommended. Reverse voltage tolerance is –60 V on VCC, SHDN, and SNS pins.
How does the LT4356IS-1#TRPBF implement adaptive fault timing?
The LT4356IS-1#TRPBF charges the TMR capacitor with a current proportional to (VCC – VOUT), so higher MOSFET VDS results in faster TMR ramp rate. During overvoltage, current ranges from ~2 µA (0.5 V VDS) to 50 µA (75 V VDS); during overcurrent, it reaches up to 260 µA (80 V VDS), ensuring rapid turn-off under high-stress conditions.
Can the LT4356IS-1#TRPBF drive logic-level MOSFETs at low input voltages?
Yes - the LT4356IS-1#TRPBF's GATE pin delivers ≥4.5 V above OUT when VCC = 4 V, enabling reliable enhancement-mode logic-level N-MOSFET drive. At higher VCC, GATE is clamped to 14 V above OUT, supporting standard-threshold devices up to 80 V input.
What is the purpose of the IN+ and AOUT pins on the LT4356IS-1#TRPBF?
IN+ and AOUT form an auxiliary amplifier with internal 1.25 V reference on the negative input. IN+ serves as the positive input for comparator or linear regulator configurations; AOUT is its open-collector output capable of sinking 2 mA. Unused IN+ must be grounded; AOUT can drive LEDs or optocouplers directly.
Does the LT4356IS-1#TRPBF support reverse battery protection without external components?
The LT4356IS-1#TRPBF itself does not block reverse current, but it enables robust reverse input protection by tolerating –60 V on VCC, SHDN, and SNS. When paired with back-to-back N-MOSFETs (controlled via GATE and optional AOUT/IN+), it eliminates the need for lossy Schottky diodes while maintaining full functionality.
LT4356IS-1#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
LT4356IS-1#TRPBF FAQ
1.How can I place an order for LT4356IS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356IS-1#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 LT4356IS-1#TRPBF reliable?
The price and inventory of LT4356IS-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356IS-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT4356IS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356IS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356IS-1#TRPBF?
LT4356IS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356IS-1#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 LT4356IS-1#TRPBF?
For technical support, including LT4356IS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356IS-1#TRPBF requirements.
6.How does Aetrix verify that LT4356IS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT4356IS-1#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 LT4356IS-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT4356IS-1#TRPBF?
All LT4356IS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356IS-1#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 LT4356IS-1#TRPBF part is unused and in its original packaging.
Return procedure for LT4356IS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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