My Inquiry
My Account
Analog Devices Inc. LT4356MPS-2#PBF
- Part No.:
- LT4356MPS-2#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT4356MPS-2#PBF.pdf
- Description:
- IC SURGE STOPPER ADJ 16-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:145
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT4356MPS-2#PBF 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) via external N-channel MOSFET gate control. It features 4V–80V operating range, 50mV overcurrent sense threshold, –60V reverse input tolerance, 60µA shutdown current, and guaranteed operation from –55°C to 125°C. It is used in automotive power distribution systems requiring uninterrupted operation under transient stress.
For engineers reviewing the LT4356MPS-2#PBF datasheet, LT4356MPS-2#PBF pinout, LT4356MPS-2#PBF application, or LT4356MPS-2#PBF equivalent, key selection criteria include adjustable fault timer response, auxiliary amplifier functionality during shutdown, reverse input protection capability, and SO-16 package compatibility with industrial-grade thermal performance (θJA = 100°C/W).
Technical Context
The LT4356MPS-2#PBF implements dual-fault protection using independent voltage and current amplifiers: the FB amplifier servo-regulates output clamp voltage by controlling GATE to maintain 1.25V at FB, while the SNS amplifier limits VCC–SNS differential to 50mV for overcurrent protection. Fault timing is dynamically scaled by VDS (VCC–OUT), enabling adaptive MOSFET safe operating area (SOA) management.
Unlike the LT4356MP-1 variant, the LT4356MPS-2#PBF maintains auxiliary amplifier operation and 60µA shutdown current during SHDN assertion-enabling undervoltage lockout or always-on linear regulator control without full system reset. Its SO-16 package includes dedicated IN+ and AOUT pins for auxiliary amplifier interface, absent in the MSOP variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - supports cold-crank automotive operation and withstands 80V transients without damage. |
| Overcurrent Sense Threshold | 50mV (ΔVSNS) - sets precise current limit independent of supply voltage; enables accurate RSENSE selection. |
| Shutdown Quiescent Current | 60µA - preserves auxiliary amplifier bias during shutdown for UVLO or standby regulation functions. |
| Reverse Input Tolerance | –60V - allows direct connection to reversed battery inputs without external diode or protection circuitry. |
| Temperature Range | –55°C to 125°C - qualified for under-hood automotive and industrial embedded environments. |
| GATE Drive Range | 4.5V to 16V above OUT - ensures robust turn-on of standard-threshold N-channel MOSFETs across full VCC range. |
| Fault Timer Current Scaling | 2µA to 260µA (VDS-dependent) - shortens fault timeout under high-power overcurrent conditions to prevent MOSFET destruction. |
Pinout & Package
LT4356MPS-2#PBF is housed in a 16-lead plastic SO package (SO-16), with θJA = 100°C/W and rated for –55°C to 125°C operation. Pin 1 is TMR; pin 16 is SHDN. The package includes dedicated IN+ and AOUT pins for auxiliary amplifier use, distinguishing it from the 10-lead MSOP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TMR | Fault timer capacitor node | Charged by VDS-scaled current during faults; thresholds at 1.25V (FLT assert) and 1.35V (GATE off). |
| FB | Voltage regulation feedback input | Servo point for 1.25V reference; sets output clamp voltage via external resistor divider from OUT. |
| OUT | MOSFET source voltage sense | Detects pass transistor conduction state; enables EN pin latching and VDS-based timer scaling. |
| GATE | N-channel MOSFET gate driver output | Pulled up by internal charge pump; clamped to ≤14V above OUT; drives external high-side switch. |
| SNS | Current sense input | Monitors VCC–SNS differential; triggers overcurrent protection when ΔV ≥ 50mV. |
| VCC | Main supply input | Accepts 4V–80V; withstands –60V reverse bias; powers all internal blocks except auxiliary amp in LT4356-1. |
| IN+ | Auxiliary amplifier non-inverting input | Enables comparator or linear regulator control; clamped to 7V; unused must be grounded. |
| AOUT | Auxiliary amplifier open-collector output | Sinks up to 2mA from 80V; usable for LED drive or optocoupler interface during shutdown (LT4356-2 only). |
| GND | Device ground reference | Common return for all analog and digital circuitry; connects to system ground plane. |
| EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until OUT resets. |
| FLT | Open-collector fault indicator | Pulls low at VTMR = 1.25V; signals impending power-down due to overvoltage or overcurrent. |
| SHDN | Shutdown control input | Pulled below 0.4V to enter shutdown; tolerates –60V to 100V; controls quiescent current mode (60µA for LT4356-2). |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic fault timer scaling | VDS-proportional timer current (2–260µA) ensures MOSFET stays within SOA during both overvoltage and overcurrent events. |
| Reverse input protection | –60V tolerance on VCC and SHDN pins eliminates need for external Schottky diode or reverse-polarity circuitry. |
| Always-on auxiliary amplifier | Remains active during shutdown (60µA mode), enabling undervoltage lockout or standby regulator control without wake-up delay. |
| Adjustable output clamp | 1.25V FB reference with external resistor divider allows precise output voltage regulation during transients (e.g., 27V clamp). |
| Robust gate drive | Charge-pump-based GATE output delivers ≥10V drive above OUT up to 80V VCC, ensuring reliable N-MOSFET turn-on. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
Use Scenario: Vehicle electrical system subjected to 60V/200ms load dump transient during alternator regulation failure. IC Role / Device Role / Timing Role: LT4356MPS-2#PBF regulates output to 27V by servoing external N-MOSFET gate, limiting VDS stress while maintaining power to ECUs. Use Value: Enables uninterrupted operation of safety-critical modules (e.g., ABS, airbag controllers) during ISO 7637-2 Pulse 5a events. | Use Scenario: Backplane power insertion into live 48V telecom rack with risk of inrush and short-circuit faults. IC Role / Device Role / Timing Role: LT4356MPS-2#PBF acts as high-side switch controller with programmable fault timer, limiting current to 500mA during plug-in. Use Value: Prevents bus collapse and contact arcing by limiting peak inrush energy while allowing controlled ramp-up. |
| Intrinsic Safety Barrier Interface | Redundant Power Supply Monitoring |
Use Scenario: Hazardous-area instrumentation requiring <60V isolation and fault-limited energy delivery. IC Role / Device Role / Timing Role: LT4356MPS-2#PBF enforces 40V output clamp and 50mV current limit, with fault timer set to 10ms to restrict fault energy. Use Value: Meets IEC 60079-11 spark ignition energy limits (<10mJ) without external Zener barriers or fuses. | Use Scenario: Dual-redundant 24V DC power supplies feeding critical PLC I/O modules. IC Role / Device Role / Timing Role: LT4356MPS-2#PBF monitors primary supply; FLT output triggers switchover to backup if VOUT exceeds 30V for >50ms. Use Value: Provides deterministic, self-timed fault detection independent of host MCU firmware, eliminating single-point failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356MPS-1#PBF | 7µA shutdown current; auxiliary amplifier disabled during shutdown; identical pinout and protection features. | Preferred where lowest standby power is critical and no auxiliary monitoring is needed during sleep. | Select LT4356MPS-1#PBF for battery-backed systems requiring sub-10µA quiescent draw. |
| TPS26631PWPR | Integrated 80V MOSFET; fixed 32V overvoltage clamp; no adjustable timer or auxiliary amplifier; 16-pin HTSSOP. | Suitable for space-constrained designs where discrete MOSFET layout and SOA analysis are undesirable. | Choose TPS26631PWPR when board area is limited and fixed-clamp behavior suffices for transient profile. |
Compared with LT4356MPS-1#PBF, the LT4356MPS-2#PBF trades 53µA higher shutdown current for continuous auxiliary amplifier operation-enabling real-time UVLO monitoring without wake-up latency. Versus TPS26631PWPR, it offers full design flexibility (external MOSFET SOA optimization, adjustable clamp, dynamic timer) at the cost of additional external components.
Availability
LT4356MPS-2#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, industrial hot-swap power distribution, intrinsic safety barrier interfaces, and redundant power supply monitoring requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT4356MPS-2#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and reliability-critical applications.
The LT4356 product line was designed specifically for high-voltage transient suppression in automotive, avionic, and industrial power systems-delivering regulated output clamping, adaptive fault timing, and reverse-input resilience in a single IC.
FAQ
What is the key functional difference between LT4356MPS-2#PBF and LT4356MPS-1#PBF?
The LT4356MPS-2#PBF maintains auxiliary amplifier operation and draws 60µA shutdown current, whereas the LT4356MPS-1#PBF disables the auxiliary amplifier and draws only 7µA in shutdown. This makes LT4356MPS-2#PBF suitable for applications requiring undervoltage detection or standby regulation during low-power states-functions unavailable in LT4356MPS-1#PBF. Both share identical overvoltage/overcurrent protection architecture and SO-16 pinout.
Can LT4356MPS-2#PBF protect against reverse battery connection?
Yes, LT4356MPS-2#PBF tolerates –60V on both VCC and SHDN pins, enabling direct connection to reversed battery terminals without external protection diodes. During reverse polarity, the internal circuitry remains undamaged and draws minimal leakage current. However, external back-to-back N-MOSFETs must be used in the power path to block reverse current flow-LT4356MPS-2#PBF itself does not provide active reverse-current blocking.
How does the fault timer in LT4356MPS-2#PBF adapt to different overvoltage magnitudes?
The LT4356MPS-2#PBF charges the TMR capacitor with a current proportional to VDS (VCC–OUT). For an 80V overvoltage event, timer current reaches ~50µA, resulting in faster FLT assertion and shorter total fault time versus a 20V event (~8µA). This VDS-scaling ensures the external MOSFET operates within its safe operating area across the full transient spectrum-preventing thermal runaway during high-energy surges while allowing ride-through of benign spikes.
What is the minimum recommended TMR capacitor value for stable operation of LT4356MPS-2#PBF?
LT4356MPS-2#PBF requires a minimum 10nF ceramic capacitor (X7R, 10V rating) between TMR and GND for loop compensation and stable regulation. Smaller values risk oscillation in the voltage control loop or erratic fault timing. Larger capacitors extend warning and cooldown periods linearly-e.g., a 100nF capacitor yields ~2ms warning time and ~425ms cooldown-but must remain within voltage derating limits for the selected dielectric.
Does LT4356MPS-2#PBF support adjustable overvoltage clamp voltage?
Yes, LT4356MPS-2#PBF supports fully adjustable output clamp voltage via the FB pin. Connecting a resistive divider from OUT to GND sets the regulated output level using the internal 1.25V reference: VOUT = 1.25V × (1 + R1/R2). This allows precise clamping at values such as 27V (automotive), 36V (industrial), or 48V (telecom), with stability maintained across temperature and load variations per the datasheet's compensation guidelines.
LT4356MPS-2#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
LT4356MPS-2#PBF FAQ
1.How can I place an order for LT4356MPS-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356MPS-2#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 LT4356MPS-2#PBF reliable?
The price and inventory of LT4356MPS-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT4356MPS-2#PBF is usually 5 days.
3.What payment methods are accepted for LT4356MPS-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356MPS-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356MPS-2#PBF?
LT4356MPS-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356MPS-2#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 LT4356MPS-2#PBF?
For technical support, including LT4356MPS-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356MPS-2#PBF requirements.
6.How does Aetrix verify that LT4356MPS-2#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356MPS-2#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 LT4356MPS-2#PBF meets industry standards.
7.What is the process for return or replacement of LT4356MPS-2#PBF?
All LT4356MPS-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356MPS-2#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 LT4356MPS-2#PBF part is unused and in its original packaging.
Return procedure for LT4356MPS-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT4356MPS-2#PBF Tags
-
TVS3300DRVR
Texas Instruments
-
TCPP01-M12
STMicroelectronics
-
TPD4S214YFFR
Texas Instruments
-
TPD6S300ARUKR
Texas Instruments
-
TBU-CA085-300-WH
Bourns Inc.
-
TBU-CA065-500-WH
Bourns Inc.
-
TBU-CA040-100-WH
Bourns Inc.
-
TBU-CA085-500-WH
Bourns Inc.
-
TBU-CA085-200-WH
Bourns Inc.
-
NX20P0408UKZ
NXP Semiconductors
-
TBU-CA085-100-WH
Bourns Inc.
-
TBU-CA050-300-WH
Bourns Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
