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Analog Devices Inc. LT4363IS-1#PBF
- Part No.:
- LT4363IS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363IS-1#PBF.pdf
- Description:
- IC SURGE STOPPER HV 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:226
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Product details
Overview
LT4363IS-1#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during overvoltage transients up to 100V, limits current via 50mV SNS–OUT sense threshold, and latches off after fault timeout. It operates from 4V to 80V input, supports –40°C to +85°C industrial temperature range, and delivers precise 1.275V FB reference for adjustable 27V output clamping in avionics and hot-swap systems.
For engineers reviewing the LT4363IS-1#PBF datasheet, LT4363IS-1#PBF pinout, LT4363IS-1#PBF application, or LT4363IS-1#PBF equivalent, key selection considerations include its latch-off behavior (LT4363-1 variant), 16-pin SO package with NC pins, 7µA shutdown current, reverse input protection to –60V, and UV/OV comparator thresholds at 1.275V with 12mV/7.5mV hysteresis.
Technical Context
The LT4363IS-1#PBF implements dual-fault protection using independent voltage and current regulation loops: an internal amplifier maintains 1.275V at FB during overvoltage by modulating GATE to clamp output, while a current-sense servo holds ΔVSNS = 50mV (or 25mV if OUT < 2V) during overcurrent. Fault timing is dynamically scaled by VCC–OUT voltage to optimize MOSFET safe operating area.
It features precision comparators for UV (1.275V threshold, 12mV hysteresis) and OV (1.275V threshold, 7.5mV hysteresis), a 125°C max junction temperature, and SO-16 package with thermal resistance θJA = 80°C/W. The SHDN pin withstands –60V to 100V and reduces ICC to ≤7µA when pulled below 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 80V operating; survives –60V reverse input without damage |
| Output Clamp Accuracy | 1.275V FB reference ±2.5% ensures stable 27V regulation with external resistor divider |
| Current Limit Threshold | 50mV SNS–OUT sense voltage (reduced to 25mV if OUT < 2V) enables precise 500mA–4A load protection |
| Fault Response Time | ≤1µs overvoltage turn-off propagation delay ensures rapid MOSFET gate shutdown under transient stress |
| Shutdown Current | ≤7µA at SHDN ≤ 0.4V enables ultra-low-power system-level power gating |
| UV/OV Threshold | 1.275V ±0.035V with 12mV/7.5mV hysteresis provides noise-immune supply monitoring |
| Package | 16-pin plastic SO with exposed thermal pad not present; θJA = 80°C/W |
Pinout & Package
LT4363IS-1#PBF is housed in a 16-lead plastic SO package (S package) with 0.050" lead pitch and no exposed pad. Pin 1 is OUT; pins 3, 5, 11, and 13 are NC (no connect); all GND pins (pins 14 and 16) must be tied to system ground for proper operation and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Output voltage sense input | Senses source node of external N-MOSFET; sets VCC–OUT differential driving TMR timer current |
| SNS (Pin 2) | Current sense input | Connects to high-side of sense resistor; ΔVSNS regulated to 50mV for current limiting |
| NC (Pin 3) | No connection | Not bonded internally; must remain unconnected on PCB |
| GATE (Pin 4) | N-MOSFET gate drive output | Charge-pump-driven output pulling up to 13V above OUT; clamped at 14V for fault protection |
| NC (Pin 5) | No connection | Not bonded internally; must remain unconnected on PCB |
| VCC (Pin 6) | Main supply input | Accepts 4V–80V input; withstands –60V reverse bias; powers internal circuitry and charge pump |
| NC (Pin 7) | No connection | Not bonded internally; must remain unconnected on PCB |
| SHDN (Pin 8) | Shutdown control input | Pull ≤0.4V to enter 7µA shutdown; pull ≥2.1V or float to enable; rated –60V to 100V |
| FB (Pin 9) | Feedback input | Connects to resistive divider from OUT to GND; regulates output to 1.275V × (1 + R1/R2) |
| TMR (Pin 10) | Fault timer capacitor node | Capacitor to GND sets warning (1.275V), shutdown (1.375V), and cool-down (0.5V) thresholds |
| NC (Pin 11) | No connection | Not bonded internally; must remain unconnected on PCB |
| ENOUT (Pin 12) | Enable output | Open-collector; goes high-Z when OUT ≥ VCC – 0.5V and ≥3V, indicating MOSFET fully on |
| FLT (Pin 13) | Fault indicator output | Open-collector; pulls low at TMR = 1.275V (early warning), remains low after MOSFET turn-off |
| GND (Pin 14) | Device ground | Primary ground reference; both GND pins (14 & 16) must be connected to PCB ground plane |
| UV (Pin 15) | Undervoltage comparator input | Threshold = 1.275V; pulls GATE low if UV < threshold; connect to VCC if unused |
| GND (Pin 16) | Device ground | Secondary ground pin; must be tied to same ground net as Pin 14 for stability and EMI control |
Key Features
| Feature | Design Value |
|---|---|
| Latch-off fault response | LT4363-1 variant permanently disables GATE until SHDN is pulsed low ≥100µs - prevents auto-retry during sustained overvoltage |
| Dynamic fault timer scaling | TMR charging current varies with VCC–OUT voltage (4µA to 50µA), matching MOSFET SOA and enabling shorter timeouts at higher stress |
| Reverse input protection | Withstands –60V on VCC and SHDN pins without damage, enabling robust battery-reversal immunity in automotive and industrial systems |
| Low-quiescent shutdown | 7µA ICC(SHDN) allows long-term battery-backed operation without significant drain |
| Back-to-back MOSFET support | UV/OV comparators and gate drive architecture enable use of two N-MOSFETs instead of Schottky diode for <0.1V forward drop and zero leakage |
Applications
| Avionic Power Distribution | Industrial Hot-Swap Module |
|---|---|
Use Scenario: Aircraft power systems subjected to load dump surges exceeding 100V during generator switching or lightning-induced transients. IC Role / Device Role / Timing Role: Surge stopper regulating output to 27V while controlling external FDB33N25 MOSFET; TMR capacitor set for 100ms ride-through before latching off. Use Value: Enables uninterrupted avionics operation during MIL-STD-704F Category A/B transients; eliminates need for bulky TVS arrays and improves system MTBF. | Use Scenario: Insertion of powered blade servers into live backplanes where inrush and short-circuit faults must be contained without disrupting upstream supplies. IC Role / Device Role / Timing Role: High-side switch controller with fast (<1µs) overcurrent detection and programmable 50mV current limit; FLT signal triggers system-level fault logging. Use Value: Prevents bus collapse during hot-plug events; 7µA shutdown current supports always-on management controllers without compromising standby power budget. |
| Intrinsic Safety Barriers | Battery-Powered Medical Equipment |
Use Scenario: Isolated sensor interfaces in hazardous locations requiring energy-limited power delivery per IEC 60079-11. IC Role / Device Role / Timing Role: Output clamp regulator limiting fault energy via 27V/50mV thresholds; latch-off behavior ensures single-point failure isolation. Use Value: Meets entity parameter requirements for Group IIC gas environments; eliminates need for secondary fusing or Zener barriers in Class I Div 1 designs. | Use Scenario: Portable defibrillators and infusion pumps requiring fail-safe power path control during battery swap or ESD events. IC Role / Device Role / Timing Role: Reverse-polarity and overvoltage protector with –60V input tolerance and 1.275V precision UV lockout preventing brownout resets. Use Value: Guarantees clean power sequencing during battery replacement; SHDN pin's –60V rating enables direct connection to unregulated Li-ion stacks without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363HS-1#PBF | Same functionality and pinout; rated for –40°C to +125°C extended temperature range | Required for under-hood automotive or high-ambient industrial deployments | Select LT4363HS-1#PBF when ambient exceeds +85°C or junction temperature must stay below 125°C under full load |
| LT4363IMS-1#PBF | Identical electrical specs; packaged in 12-lead MSOP (3mm × 4mm) instead of SO-16 | Preferred for space-constrained PCBs where SO-16 footprint is prohibitive | Choose LT4363IMS-1#PBF when board area is limited and thermal performance with θJA = 135°C/W is acceptable |
Compared with LT4363HS-1#PBF and LT4363IMS-1#PBF, the LT4363IS-1#PBF offers optimal cost/performance balance for industrial-grade systems operating up to +85°C, with SO-16 packaging simplifying hand-soldering and legacy board compatibility while maintaining identical fault response, timing, and protection thresholds.
Availability
LT4363IS-1#PBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, intrinsic safety barriers, and battery-powered medical equipment requiring stable component supply across extended lifecycle programs.
Supply support for LT4363IS-1#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, communications, and aerospace markets.
The LT4363 product line was designed specifically for high-reliability DC power path protection in harsh environments, delivering integrated surge suppression, current limiting, and intelligent fault management without external microcontrollers.
FAQ
What is the maximum input voltage the LT4363IS-1#PBF can withstand without damage?
The LT4363IS-1#PBF has an absolute maximum VCC rating of –60V to +100V. It operates continuously from 4V to 80V, but can survive transient reverse-battery conditions down to –60V and input surges up to 100V without latch-up or permanent damage - confirmed in Absolute Maximum Ratings and validated in Typical Application circuits using SMAJ58A TVS clamping.
Does the LT4363IS-1#PBF automatically restart after an overvoltage fault?
No. The LT4363IS-1#PBF is the LT4363-1 variant and latches off permanently after fault timeout. GATE and FLT remain low until the SHDN pin is actively pulled low for ≥100µs and then released. This behavior is hard-coded in silicon and differs from the LT4363-2's auto-retry function.
How is the output clamp voltage set on the LT4363IS-1#PBF?
The LT4363IS-1#PBF uses the FB pin to regulate output voltage. A resistive divider from OUT to GND sets the clamp point: VOUT = 1.275V × (1 + R1/R2). For example, a 21.5kΩ (R1) and 1kΩ (R2) divider yields ~27V output - matching the 27V adjustable clamp cited in the datasheet's Typical Application and Features sections.
What is the purpose of the NC pins on the LT4363IS-1#PBF SO-16 package?
Pins 3, 5, 7, and 11 on the LT4363IS-1#PBF are designated NC (no connect) in the Pin Configuration diagram and must remain unconnected on the PCB. These pins are not bonded to die and serve only mechanical or package-standardization purposes - routing traces or soldering to them may cause assembly defects or reliability issues.
Can the LT4363IS-1#PBF protect against reverse input polarity?
Yes. The LT4363IS-1#PBF supports reverse input protection to –60V on VCC and SHDN pins per Absolute Maximum Ratings. When used with back-to-back N-channel MOSFETs (as described in the Applications section), it enables near-zero forward voltage drop and bidirectional blocking - eliminating Schottky diode losses while maintaining full –60V tolerance.
LT4363IS-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- 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:
- 16-SO
LT4363IS-1#PBF FAQ
1.How can I place an order for LT4363IS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363IS-1#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 LT4363IS-1#PBF reliable?
The price and inventory of LT4363IS-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4363IS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4363IS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363IS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363IS-1#PBF?
LT4363IS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363IS-1#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 LT4363IS-1#PBF?
For technical support, including LT4363IS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363IS-1#PBF requirements.
6.How does Aetrix verify that LT4363IS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363IS-1#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 LT4363IS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4363IS-1#PBF?
All LT4363IS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363IS-1#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 LT4363IS-1#PBF part is unused and in its original packaging.
Return procedure for LT4363IS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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