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Analog Devices Inc. LT4356MPMS-1#PBF
- Part No.:
- LT4356MPMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356MPMS-1#PBF.pdf
- Description:
- IC SURGE STOPPER ADJ 10-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:242
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Product details
Overview
LT4356MPMS-1#PBF from Analog Devices is a high-voltage surge stopper IC that protects downstream loads from automotive load dump and other high-energy transients by regulating output voltage via external N-channel MOSFET control. It operates from 4V to 80V, provides adjustable overvoltage clamping (via FB pin), delivers 50mV overcurrent sensing threshold, and guarantees operation from –55°C to 125°C. It is used in automotive power distribution modules where uninterrupted operation during 80V/200ms surges is required.
For engineers reviewing the LT4356MPMS-1#PBF datasheet, LT4356MPMS-1#PBF pinout, LT4356MPMS-1#PBF application, or LT4356MPMS-1#PBF equivalent, key selection criteria include its 7µA shutdown current, 10-pin MSOP package with –60V reverse input tolerance, fault timer programmability via TMR pin, and dual protection modes (overvoltage + overcurrent) with early-warning FLT assertion.
Technical Context
The LT4356MPMS-1#PBF integrates a voltage servo amplifier (FB pin referenced to 1.25V) and current-sense amplifier (ΔVSNS = 50mV threshold) to independently regulate output voltage and limit load current. Its GATE driver uses an internal charge pump to deliver ≥10V gate drive above OUT, enabling standard-threshold N-channel MOSFETs even at low VCC (≥4V).
Fault response is governed by a voltage-dependent timer: TMR pin current scales with (VCC – VOUT), delivering shorter fault intervals under higher stress-e.g., 50µA at 75V VDS for overvoltage, up to 260µA at 80V VDS for overcurrent-ensuring MOSFET safe operating area (SOA) compliance without fixed-time compromises.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 4V to 80V - supports cold-crank (4V) and load dump (80V) in automotive systems |
| Shutdown Current | 7µA - enables ultra-low-power standby in battery-backed systems |
| Overcurrent Threshold | 50mV across SNS–VCC - sets precise, temperature-stable current limit independent of MOSFET RDS(ON) |
| FB Reference Voltage | 1.25V ±1.2% - defines regulated output clamp level via external resistor divider |
| Reverse Input Rating | –60V on VCC/SHDN - allows direct connection to reverse-battery–tolerant automotive inputs |
| Operating Temperature | –55°C to 125°C - qualified for under-hood automotive and industrial environments |
| GATE Drive Range | VOUT + 4.5V to VOUT + 16V - drives logic-level or standard-threshold N-MOSFETs across full supply range |
Pinout & Package
LT4356MPMS-1#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm, 0.5mm pitch), rated for –55°C to 125°C operation and 300°C soldering. The exposed pad is not internally connected and may be left floating or grounded for thermal enhancement.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Voltage regulator feedback input | Servo point for 1.25V reference; sets output clamp voltage via resistive divider from OUT to GND |
| 2 OUT | MOSFET source sense node | Monitors pass transistor source voltage; enables EN latching and TMR charging proportional to (VCC – VOUT) |
| 3 GATE | N-MOSFET gate drive output | Charge-pump–driven output clamped to VOUT + 14V; delivers 150mA pull-down for fast turn-off |
| 4 SNS | Current sense input | Measures voltage drop between VCC and external sense resistor; triggers 50mV overcurrent protection |
| 5 VCC | Main supply input | Accepts 4V–80V input; withstands –60V reverse bias; powers all internal circuitry |
| 6 TMR | Fault timer capacitor node | Charged by voltage-dependent current source; 1.25V = FLT assert, 1.35V = GATE turn-off, 0.5V = retry |
| 7 GND | Device ground reference | Return path for internal amplifiers, timers, and logic; must be low-impedance for stable sensing |
| 8 EN | Open-collector enable output | High-impedance when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset by OUT voltage cycle |
| 9 FLT | Open-collector fault indicator | Pulls low at TMR = 1.25V to warn of impending shutdown; sinks up to 3mA from 80V |
| 10 SHDN | Shutdown control input | Pulled below 0.4V to enter 7µA shutdown; tolerates –60V to +100V; floats to enable via internal current source |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable overvoltage regulation | Clamps output to user-defined voltage (e.g., 27V) using FB pin and external resistor divider |
| Voltage-dependent fault timing | TMR current scales with (VCC – VOUT), shortening fault interval under higher MOSFET stress to enforce SOA compliance |
| Reverse input protection support | Enables back-to-back N-MOSFET configuration replacing Schottky diodes, reducing forward drop by >0.3V and eliminating leakage |
| Early-warning fault signaling | FLT asserts low 100mV before GATE turn-off (at TMR = 1.25V → 1.35V), enabling system backup or graceful shutdown |
| Automotive-grade thermal rating | Guaranteed operation from –55°C to 125°C with 160°C/W θJA, suitable for engine compartment mounting |
Applications
| Automotive Load Dump Protection | Hot-Swap Power Distribution |
|---|---|
Use Scenario: 12V/24V vehicle electrical system subjected to ISO 7637-2 Pulse 5a (80V, 200ms) load dump transients. IC Role / Device Role / Timing Role: Surge stopper controlling high-side N-MOSFET to clamp output at 27V while maintaining power to ECUs and infotainment. Use Value: Prevents downstream component damage without interrupting operation during transient; eliminates need for bulky TVS diodes. |
Use Scenario: Insertion of powered blade servers into live backplane with ±10% supply tolerance and 500ms inrush control. IC Role / Device Role / Timing Role: High-side switch supervisor limiting inrush current and blocking overvoltage during hot-plug events. Use Value: Enables controlled ramp-up of load voltage; avoids bus droop and false resets during insertion. |
| Industrial Battery Backup Systems | Intrinsic Safety Barriers |
Use Scenario: 48V telecom rectifier feeding critical control logic with Li-ion backup, requiring reverse polarity and surge immunity. IC Role / Device Role / Timing Role: Primary input protector enforcing <7µA shutdown current and –60V reverse tolerance during battery swap. Use Value: Extends backup runtime by minimizing quiescent drain; eliminates need for external reverse-blocking diode. |
Use Scenario: Field instrument loop-powered by 24V DC in hazardous areas, requiring energy limitation per IEC 60079-11. IC Role / Device Role / Timing Role: Intrinsically safe current limiter and overvoltage clamp using externally fused MOSFET and programmable TMR. Use Value: Meets entity parameter limits (e.g., <100mJ stored energy) by enforcing rapid turn-off during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar surge protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT4356MPS-1#PBF | 16-pin SO package; higher θJA (100°C/W); same electrical specs and pinout subset | Better thermal dissipation for >1A continuous loads; requires larger PCB footprint | Select when board layout allows SO-16 and thermal margin is constrained |
| TPS26631RGER | Integrated 60V MOSFET; fixed 2.7A current limit; no adjustable OV clamp; 2.5µA shutdown | Lower BOM count but less flexible clamping; lacks TMR-based adaptive timing | Select for space-constrained designs where fixed protection thresholds suffice |
Compared with LT4356MPMS-1#PBF, LT4356MPS-1#PBF offers identical functionality in a thermally superior SO package, while TPS26631RGER trades configurability for integration and lower quiescent current-making LT4356MPMS-1#PBF optimal for designs requiring precise, adaptive transient response and field-serviceable MOSFET replacement.
Availability
LT4356MPMS-1#PBF is available at Aetrix Electronics and suitable for automotive load dump protection, hot-swap power distribution, and industrial battery backup systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LT4356MPMS-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 automotive, industrial, communications, and healthcare markets.
The LT4356MPMS-1#PBF belongs to Analog Devices' Surge Stopper product line, engineered specifically for high-reliability power path protection in harsh environments where sustained overvoltage and overcurrent events must be managed without system interruption.
FAQ
What is the maximum reverse voltage the LT4356MPMS-1#PBF can withstand on its VCC pin?
The LT4356MPMS-1#PBF supports –60V on the VCC pin, enabling direct connection to reverse-battery–tolerant automotive inputs without external protection diodes. This rating is absolute and applies across the full –55°C to 125°C operating temperature range. The device remains undamaged and functional after exposure, provided the voltage difference between VCC and SNS stays within 30V. This capability is confirmed in the Absolute Maximum Ratings table of the official LT4356MP-1 datasheet.
How does the LT4356MPMS-1#PBF implement adaptive fault timing?
The LT4356MPMS-1#PBF implements adaptive fault timing by generating a TMR pin charging current proportional to (VCC – VOUT). During overvoltage, this current ranges from ~2µA at low VDS to 50µA at 75V VDS; during overcurrent, it scales from 4µA to 260µA at 80V VDS. This ensures faster MOSFET turn-off under higher stress, directly enforcing safe operating area (SOA) limits. The LT4356MPMS-1#PBF uses this scheme instead of fixed-timer approaches to prevent thermal runaway during high-energy transients.
Can the LT4356MPMS-1#PBF drive a logic-level MOSFET at 5V supply?
Yes, the LT4356MPMS-1#PBF can drive a logic-level MOSFET at 5V supply: its GATE pin delivers ≥4.5V above VOUT when VCC = 4V, sufficient to fully enhance common logic-level N-channel devices (e.g., IRLR2908). At VCC ≥ 8V, gate drive increases to VOUT + 10V–16V, supporting standard-threshold MOSFETs. This dual-range capability is specified in the Electrical Characteristics table under ΔVGATE and verified across temperature in Figure G12 of the LT4356MP-1 datasheet.
What is the purpose of the EN pin on the LT4356MPMS-1#PBF?
The EN pin on the LT4356MPMS-1#PBF is an open-collector enable output that goes high-impedance when the external MOSFET is fully on (VOUT > VCC – 0.7V), indicating healthy conduction. Its state is latched until VOUT drops below 0.5V and rises again above 2V-preventing chatter during marginal turn-on. It sinks up to 3mA from 80V, allowing direct LED or optocoupler interfacing for status monitoring. This behavior is documented in the PIN FUNCTIONS section of the LT4356MP-1 datasheet.
Does the LT4356MPMS-1#PBF include overcurrent protection, and how is it configured?
Yes, the LT4356MPMS-1#PBF includes precision overcurrent protection configured via the SNS pin: it regulates the voltage between VCC and SNS to 50mV ±5%, delivering a stable current limit independent of MOSFET characteristics. The sense resistor is placed between VCC and SNS, and the resulting current threshold is ILIMIT = 0.05V / RSENSE. This function is active across the full temperature range and is validated in the Electrical Characteristics table under ΔVSNS and ISNS parameters.
LT4356MPMS-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm 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:
- 10-MSOP
LT4356MPMS-1#PBF FAQ
1.How can I place an order for LT4356MPMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356MPMS-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 LT4356MPMS-1#PBF reliable?
The price and inventory of LT4356MPMS-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 LT4356MPMS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4356MPMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356MPMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356MPMS-1#PBF?
LT4356MPMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356MPMS-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 LT4356MPMS-1#PBF?
For technical support, including LT4356MPMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356MPMS-1#PBF requirements.
6.How does Aetrix verify that LT4356MPMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356MPMS-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 LT4356MPMS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4356MPMS-1#PBF?
All LT4356MPMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356MPMS-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 LT4356MPMS-1#PBF part is unused and in its original packaging.
Return procedure for LT4356MPMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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