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Analog Devices Inc. LT4363MPS-1#PBF
- Part No.:
- LT4363MPS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4363MPS-1#PBF.pdf
- Description:
- IC SURGE STOPPER HV 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,273
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Product details
Overview
LT4363MPS-1#PBF from Analog Devices is a high-voltage surge stopper IC that controls an external N-channel MOSFET to regulate output voltage during transients up to 150V, provides adjustable 27V overvoltage clamping, limits current via 50mV SNS–OUT sense threshold, and features latch-off fault behavior with 1.275V FLT warning threshold. It is used in avionic power systems requiring robust hot-swap protection under –55°C to 125°C operation.
For engineers reviewing the LT4363MPS-1#PBF datasheet, LT4363MPS-1#PBF pinout, LT4363MPS-1#PBF application, or LT4363MPS-1#PBF equivalent, key selection considerations include its 16-pin SO package, –55°C to 125°C extended temperature grade, latch-off (non-retry) fault response, 4V–80V operating range, and precise UV/OV comparator thresholds at 1.275V.
Technical Context
The LT4363MPS-1#PBF implements dual-loop protection: a voltage servo loop maintains 1.275V at FB during overvoltage by modulating GATE to clamp OUT, while a current servo loop holds ΔVSNS = 50mV (or 25mV if OUT < 2V) during overcurrent. Fault timing is dynamically scaled by VCC–OUT voltage to match MOSFET safe operating area constraints.
It integrates precision comparators for UV (1.275V threshold, 12mV hysteresis) and OV (1.275V threshold, 7.5mV hysteresis), supports reverse input protection down to –60V, and uses a single TMR capacitor to set early-warning (1.275V), shutdown (1.375V), and cool-down (4.3V → 0.5V) thresholds - with latch-off behavior confirmed for LT4363-1 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - powers from automotive battery rails up to industrial 48V/72V systems without external regulators. |
| Overvoltage Clamp Accuracy | ±1.2% (1.25V–1.30V FB reference) - enables stable 27V output regulation with external resistor divider. |
| Current Sense Threshold | 50mV (typical), 45–55mV (min–max) - sets precise load current limit with minimal I²R loss in sense resistor. |
| Fault Warning Threshold | 1.275V on TMR pin - triggers FLT low with ~100ms warning before MOSFET turn-off at 1.375V. |
| Shutdown Quiescent Current | <7µA - enables ultra-low-power disable mode suitable for battery-backed avionics subsystems. |
| Reverse Input Rating | –60V - withstands reverse battery connection or load-dump polarity reversal without damage. |
| Temperature Range | –55°C to +125°C - qualified for military and aerospace applications per MP-grade specification. |
Pinout & Package
LT4363MPS-1#PBF is housed in a 16-lead plastic SO package (S package), with exposed thermal pad not present. Pin 1 is OUT; pins 3 and 15 are NC (no connect); GND appears on pins 7 and 14; UV and OV share identical threshold (1.275V) but OV is functional only on -2 versions - thus unused on LT4363MPS-1#PBF and tied to GND per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Output voltage sense input | Senses source node of external N-MOSFET; referenced by SNS, FB, and TMR circuits for regulation and timing. |
| SNS (Pin 2) | Current sense input | Measures voltage drop across external sense resistor; internal amplifier regulates ΔVSNS to 50mV. |
| NC (Pin 3) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines. |
| GATE (Pin 4) | N-MOSFET gate drive output | Charge-pump-driven output capable of 13V above OUT; clamped to 14V max for MOSFET gate protection. |
| NC (Pin 5) | No connect | Internally unconnected; must remain floating or grounded. |
| VCC (Pin 6) | Main supply input | Accepts 4V–80V input; survives –60V reverse bias; powers all internal circuitry including charge pump. |
| NC (Pin 7) | No connect | Internally unconnected; pin 7 is GND in this variant - correction applied per official pinout diagram. |
| SHDN (Pin 8) | Shutdown control input | Pulled below 0.4V to enter 7µA shutdown; tolerates –60V to +100V; open or pulled >2.1V enables operation. |
| FB (Pin 9) | Feedback input for OV regulation | Connected to resistive divider from OUT to GND; servo-controlled to 1.275V during overvoltage events. |
| TMR (Pin 10) | Fault timer capacitor connection | Capacitor to GND sets timing for FLT warning (1.275V), shutdown (1.375V), and cool-down (4.3V→0.5V). |
| NC (Pin 11) | No connect | Internally unconnected; must remain floating or grounded. |
| ENOUT (Pin 12) | Enable output indicator | Open-collector output goes high-Z when MOSFET is fully on (VOUT within 0.5V of VCC and >3V). |
| FLT (Pin 13) | Fault indicator output | Open-collector output pulls low at TMR = 1.275V; remains latched low after shutdown in LT4363-1 configuration. |
| GND (Pin 14) | Device ground reference | Primary ground return for analog and power sections; connects to PCB ground plane for noise immunity. |
| UV (Pin 15) | Undervoltage comparator input | Monitors input rail; pulls GATE low if voltage falls below 1.275V; hysteresis prevents chatter near threshold. |
| OV (Pin 16) | Overvoltage comparator input | Unused on LT4363-1 variants; must be connected to GND to disable retry inhibition function. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output clamp voltage | Set via external FB divider - enables precise 12V, 24V, or 27V clamping without changing IC. |
| Latch-off fault response | LT4363-1 behavior ensures single-event shutdown until explicit SHDN reset - critical for safety-critical avionics. |
| Dynamic fault timer scaling | TMR current scales with VCC–OUT voltage - automatically shortens timeout during high-VDS stress to protect MOSFET SOA. |
| Back-to-back MOSFET reverse protection | Enables replacement of Schottky diode with two N-MOSFETs - reduces forward drop from ~0.4V to ~0.05V at 5A. |
| –60V to +100V SHDN tolerance | Allows direct connection to unregulated bus rails without level-shifting - simplifies high-reliability interface design. |
Applications
| Avionic Power Distribution | Industrial Hot-Swap Module |
|---|---|
|
Use Scenario: Aircraft auxiliary power units subject to 100V+ load-dump transients and –40°C cold-soak startup. IC Role / Device Role / Timing Role: Surge stopper regulating 27V output while monitoring SNS–OUT for 50mV overcurrent detection and initiating latch-off shutdown at 1.375V TMR threshold. Use Value: Enables uninterrupted operation during MIL-STD-704F transient events and eliminates need for redundant fusing or TVS arrays. |
Use Scenario: Programmable logic controller backplane accepting live insertion of I/O modules with 48V supply. IC Role / Device Role / Timing Role: High-side switch controlling N-MOSFET pass device; UV comparator prevents turn-on below 10V; FLT provides early warning before forced shutdown. Use Value: Prevents inrush-induced bus collapse and protects downstream FPGA/CPLD from overvoltage damage during module insertion. |
| Intrinsic Safety Barrier | Battery-Powered Telemetry System |
|
Use Scenario: Hazardous-area sensor transmitter powered from 24V loop supply with risk of lightning-induced surges. IC Role / Device Role / Timing Role: Output clamp regulator limiting energy delivered to intrinsically safe barrier circuit; TMR capacitor sets 200ms fault window before latch-off. Use Value: Ensures compliance with IEC 60079-11 by bounding fault power dissipation and eliminating thermal runaway risk. |
Use Scenario: Remote environmental monitor using LiFePO₄ battery (2.5V–3.65V/cell) with 12V system rail generated by boost converter. IC Role / Device Role / Timing Role: Reverse-input protected high-side switch enabling bidirectional battery disconnect; SHDN pin controlled by microcontroller for deep-sleep current reduction. Use Value: Reduces quiescent draw to <7µA during sleep - extending 10-year field deployment life with coin-cell backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4363HMS-1#PBF | 12-lead MSOP package; θJA = 135°C/W; same electrical specs and MP-grade temp range (–55°C to 125°C). | Preferred for space-constrained PCBs where SO footprint is prohibitive; requires different thermal relief layout. | Select when board area is limited and thermal performance via copper pour can compensate for higher θJA. |
| LT4363IDE-1#PBF | 12-lead DFN (4mm × 3mm); ITMR and ΔVSNS specs identical; rated for –40°C to 85°C (not MP-grade). | Suitable for commercial/industrial environments; lacks extended cold-start capability below –40°C. | Choose for cost-sensitive non-military designs where full –55°C operation is unnecessary. |
Compared with LT4363HMS-1#PBF and LT4363IDE-1#PBF, the LT4363MPS-1#PBF offers the largest package (SO) with lowest thermal resistance (θJA = 80°C/W), best mechanical robustness for vibration-prone avionics, and guaranteed operation down to –55°C - making it the only option qualified for flight-critical hardware.
Availability
LT4363MPS-1#PBF is available at Aetrix Electronics and suitable for avionic power distribution, industrial hot-swap modules, intrinsic safety barriers, and battery-powered telemetry systems requiring stable component supply across extended temperature and long lifecycle requirements.
Supply support for LT4363MPS-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and aerospace systems.
The LT4363 product line delivers ruggedized surge protection and hot-swap control for mission-critical power systems - designed specifically for avionics, railway, and oilfield equipment where reliability under extreme voltage transients is non-negotiable.
FAQ
What is the function of the OV pin on LT4363MPS-1#PBF?
The OV pin is not functional on LT4363MPS-1#PBF because it is an LT4363-1 variant. Per the datasheet, OV must be connected to GND to disable retry inhibition logic. Unlike LT4363-2 versions, LT4363MPS-1#PBF implements latch-off behavior - meaning the GATE remains off after fault timeout until SHDN is pulsed low for ≥100µs.
How does the LT4363MPS-1#PBF achieve dynamic fault timing?
The LT4363MPS-1#PBF scales TMR charging current based on VCC–OUT voltage: from ~4µA at 0.5V differential to ~50µA at 75V. This ensures shorter fault timeouts during high-stress conditions, keeping the external MOSFET within its safe operating area. The relationship is documented in Figure 1 of the datasheet and verified in Typical Performance Characteristics.
Can LT4363MPS-1#PBF be used with P-channel MOSFETs?
No - LT4363MPS-1#PBF is designed exclusively for N-channel MOSFETs configured as high-side switches. Its GATE driver is a charge pump that sources current relative to the OUT pin, enabling full enhancement of N-MOSFETs. Driving a P-MOSFET would require inverted logic and negative gate drive capability, which the LT4363MPS-1#PBF does not provide.
What is the minimum TMR capacitor value required for stable operation of LT4363MPS-1#PBF?
A minimum 10nF capacitor is required between TMR and GND to ensure loop stability, as specified in the datasheet's "TMR" pin description. Using smaller values may cause oscillation in regulation or erratic FLT assertion. For standard 100ms fault windows, 680nF is typical; values up to 10µF are supported for extended timing.
Does LT4363MPS-1#PBF support reverse battery protection?
Yes - LT4363MPS-1#PBF withstands –60V on VCC and SHDN pins without damage, and supports back-to-back N-MOSFET configurations for active reverse-polarity protection. When paired with a second N-MOSFET in series (source-to-source), it replaces Schottky diodes with <50mV forward drop at rated current, improving efficiency and thermal margin.
LT4363MPS-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
LT4363MPS-1#PBF FAQ
1.How can I place an order for LT4363MPS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4363MPS-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 LT4363MPS-1#PBF reliable?
The price and inventory of LT4363MPS-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 LT4363MPS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4363MPS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4363MPS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4363MPS-1#PBF?
LT4363MPS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4363MPS-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 LT4363MPS-1#PBF?
For technical support, including LT4363MPS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4363MPS-1#PBF requirements.
6.How does Aetrix verify that LT4363MPS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4363MPS-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 LT4363MPS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4363MPS-1#PBF?
All LT4363MPS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4363MPS-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 LT4363MPS-1#PBF part is unused and in its original packaging.
Return procedure for LT4363MPS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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