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Analog Devices Inc. LT4356CMS-1#PBF
- Part No.:
- LT4356CMS-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Surge Suppression Ics
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT4356CMS-1#PBF.pdf
- Description:
- IC OVERVOLT PROT REG 10-MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,117
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Product details
Overview
LT4356CMS-1#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, 7µA shutdown current, and operates up to 125°C in the MSOP package. Used in automotive power distribution and industrial hot-swap systems.
For engineers reviewing the LT4356CMS-1#PBF datasheet, LT4356CMS-1#PBF pinout, LT4356CMS-1#PBF application, or LT4356CMS-1#PBF equivalent, key selection criteria include adjustable fault timer response, reverse input protection to –60V, auxiliary amplifier functionality, and compatibility with back-to-back FET reverse polarity schemes.
Technical Context
The LT4356CMS-1#PBF implements dual-fault protection: overvoltage regulation via FB-pin servoing to 1.25V and overcurrent limiting by clamping VCC–VSNS to 50mV. Its internal charge pump drives the GATE pin up to 14V above OUT, enabling logic-level N-MOSFET control even at low VCC (≥4V).
Fault timing is dynamically scaled by VDS (VCC–VOUT): overvoltage timer current ranges from ~2µA (0.5V) to 50µA (75V); overcurrent timer current scales from 4µA to 260µA (80V). FLT asserts at 1.25V on TMR; GATE turns off at 1.35V; retry occurs at 0.5V after cool-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 4V to 80V - supports cold-crank automotive operation and withstands reverse battery to –60V. |
| Shutdown Quiescent Current | 7µA - enables ultra-low-power system sleep mode without disabling protection circuitry. |
| Overcurrent Sense Threshold | 50mV - sets precise current limit via external sense resistor; reduces MOSFET stress during short circuits. |
| FB Pin Reference Voltage | 1.25V ±25mV - defines regulated output clamp voltage via external resistive divider (e.g., 27V at VOUT). |
| Max Junction Temperature | 125°C - rated for under-hood automotive and industrial environments with guaranteed operation. |
| GATE Drive Voltage Range | VOUT + 4.5V to VOUT + 16V - ensures robust turn-on of standard and logic-level N-channel MOSFETs. |
| TMR Pin Fault Thresholds | 1.25V (FLT assert), 1.35V (GATE off), 0.5V (retry) - enables programmable warning interval and automatic recovery. |
Pinout & Package
LT4356CMS-1#PBF is housed in a 10-lead plastic MSOP package (3mm × 3mm × 1.1mm), thermally enhanced with exposed pad optional grounding. Pin 1 is marked by dot; pin count and layout conform to JEDEC MO-187AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback Input | Connects to center tap of output divider; servoed to 1.25V during overvoltage regulation. |
| 2 (OUT) | Output Sense | Senses MOSFET source voltage; triggers EN latch and sets TMR charging current based on VCC–VOUT. |
| 3 (GATE) | N-MOSFET Gate Driver | Charge-pump output clamped to VOUT + 14V; pulls up/down to regulate voltage or limit current. |
| 4 (SNS) | Current Sense Input | Monitors voltage drop across external sense resistor; limits VCC–VSNS to 50mV. |
| 5 (VCC) | Main Supply Input | Accepts 4V–80V; survives –60V reverse bias; powers internal circuitry and charge pump. |
| 6 (TMR) | Fault Timer Capacitor Node | Capacitor to GND sets fault delay and cool-down; current scales with VDS for SOA-optimized timing. |
| 7 (GND) | Device Ground | Reference for all analog blocks; connects to system ground plane; no internal connection to exposed pad. |
| 8 (EN) | Enable Output | Open-collector; goes high-Z when MOSFET is fully on (VOUT > VCC – 0.7V); latched until reset. |
| 9 (FLT) | Fault Indicator Output | Open-collector; pulls low at TMR = 1.25V to warn of impending shutdown; sinks up to 3mA from 80V. |
| 10 (SHDN) | Shutdown Control | TTL-compatible input; <0.4V activates 7µA shutdown mode; withstands –60V to 100V without damage. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Fault Timer Scaling | Timer current varies with VDS (VCC–VOUT) - ensures MOSFET stays within Safe Operating Area during both overvoltage and overcurrent faults. |
| Reverse Input Protection Support | SHDN and SNS pins tolerate –60V - enables use of back-to-back N-MOSFETs instead of Schottky diodes, reducing forward drop and power loss. |
| Integrated Auxiliary Amplifier | Internal 1.25V reference + AOUT/IN+ pins - configurable as UVLO comparator or linear regulator controller for PNP pass devices. |
| Programmable Early Warning Interval | Fixed 100mV window between FLT assert (1.25V) and GATE off (1.35V) - provides deterministic time for system backup before shutdown. |
| Robust Gate Drive Architecture | Charge pump + 150mA pull-down - delivers fast, high-current turn-off during overcurrent events while maintaining low-loss conduction in normal operation. |
Applications
| Automotive Load Dump Protection | Industrial Hot-Swap Power Distribution |
|---|---|
|
Use Scenario: Vehicle electrical system experiences 60V/200ms load dump transient during alternator regulation failure. IC Role / Device Role / Timing Role: LT4356CMS-1#PBF regulates output to 27V via external N-MOSFET, limiting stress while sustaining ECU operation. Use Value: Prevents downstream component damage and maintains functional safety without system reboot. |
Use Scenario: Rack-mounted server module insertion causes inrush and potential bus voltage sag or surge. IC Role / Device Role / Timing Role: LT4356CMS-1#PBF controls inrush current and clamps supply rail during plug-in transients using programmable TMR capacitor. Use Value: Enables zero-downtime live insertion while protecting backplane power integrity and avoiding brownouts. |
| Intrinsic Safety Barrier Power | Battery-Powered High-Side Switch |
|
Use Scenario: Hazardous-area instrumentation requires certified power limiting to prevent ignition energy in explosive atmospheres. IC Role / Device Role / Timing Role: LT4356CMS-1#PBF acts as intrinsically safe overvoltage/overcurrent limiter with fail-safe shutdown and thermal derating. Use Value: Meets IEC 60079-11 requirements via precise 50mV current limit and 125°C operation without external supervision. |
Use Scenario: Portable medical device uses Li-ion battery (8.4V–12.6V) with need for reverse polarity and surge protection. IC Role / Device Role / Timing Role: LT4356CMS-1#PBF drives high-side N-MOSFET with 7µA shutdown current and –60V reverse tolerance. Use Value: Eliminates Schottky diode losses, extends battery runtime, and guarantees safe reverse connection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4365IMS-1#PBF | Lower voltage range (4.5V–40V); integrated MOSFET; no auxiliary amplifier; fixed 28V clamp. | Best for space-constrained 12V/24V systems where external FET drive is unnecessary. | Select LTC4365IMS-1#PBF only if input voltage never exceeds 40V and integrated solution suffices. |
| TPS26631RGER | 4.5V–60V range; 1.2A integrated FET; no adjustable clamp; fixed 1.5ms fault timer; no TMR scaling. | Suitable for USB PD or PoE-powered peripherals needing simple hot-swap with minimal BOM. | Choose TPS26631RGER when design prioritizes integration over programmability and SOA optimization. |
Compared with LTC4365IMS-1#PBF and TPS26631RGER, LT4356CMS-1#PBF uniquely supports 80V operation, dynamic VDS-scaled fault timing, and auxiliary amplifier flexibility-making it optimal for automotive, avionic, and high-reliability industrial systems requiring field-programmable protection behavior.
Availability
LT4356CMS-1#PBF is available at Aetrix Electronics and suitable for automotive surge protection, industrial hot-swap power distribution, and intrinsic safety barrier applications requiring stable component supply across extended temperature ranges.
Supply support for LT4356CMS-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, power, and reliability-critical markets.
The LT4356 family is designed as a programmable surge stopper for high-voltage DC power rails-targeting automotive, avionic, and industrial systems where load continuity during transients is mandatory.
FAQ
What is the maximum input voltage the LT4356CMS-1#PBF can withstand?
The LT4356CMS-1#PBF supports continuous operation from 4V to 80V on the VCC pin and tolerates reverse bias down to –60V without damage. Absolute maximum rating for VCC is 100V transient, but sustained operation above 80V violates specification limits and risks reliability degradation. Always verify VCC derating per ambient temperature per the datasheet thermal curves.
How does the LT4356CMS-1#PBF differ from the LT4356CMS-2#PBF?
The LT4356CMS-1#PBF draws only 7µA in shutdown, disabling all functional blocks including the auxiliary amplifier. The LT4356CMS-2#PBF draws 60µA in shutdown but keeps its internal 1.25V reference and auxiliary amplifier active-enabling undervoltage lockout or always-on regulator functions. Both share identical pinout, protection architecture, and timing behavior outside shutdown.
Can the LT4356CMS-1#PBF drive a logic-level N-channel MOSFET at low VCC?
Yes. The LT4356CMS-1#PBF's charge pump delivers ≥4.5V gate drive above VOUT even at VCC = 4V, sufficient to fully enhance logic-level N-MOSFETs (e.g., IRLR2908). At higher VCC, gate drive reaches up to VOUT + 16V, supporting standard gate-threshold devices. Gate drive strength is verified across –40°C to 125°C.
What is the purpose of the TMR pin on the LT4356CMS-1#PBF?
The TMR pin on the LT4356CMS-1#PBF sets the fault timer duration via an external capacitor to ground. Its charging current scales with VDS (VCC–VOUT) to optimize MOSFET Safe Operating Area usage. FLT asserts at 1.25V; GATE turns off at 1.35V; and retry begins at 0.5V after cool-down-enabling programmable ride-through and automatic recovery.
Does the LT4356CMS-1#PBF support reverse input protection?
Yes. The SHDN and SNS pins withstand –60V, and the VCC pin tolerates –60V reverse bias. This allows implementation of back-to-back N-channel MOSFETs for reverse polarity protection-eliminating Schottky diode forward voltage drop and associated power loss while maintaining full overvoltage/overcurrent protection functionality in the LT4356CMS-1#PBF.
LT4356CMS-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
LT4356CMS-1#PBF FAQ
1.How can I place an order for LT4356CMS-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT4356CMS-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 LT4356CMS-1#PBF reliable?
The price and inventory of LT4356CMS-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 LT4356CMS-1#PBF is usually 5 days.
3.What payment methods are accepted for LT4356CMS-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT4356CMS-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT4356CMS-1#PBF?
LT4356CMS-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT4356CMS-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 LT4356CMS-1#PBF?
For technical support, including LT4356CMS-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT4356CMS-1#PBF requirements.
6.How does Aetrix verify that LT4356CMS-1#PBF is sourced from the original manufacturer or authorized distributors?
All LT4356CMS-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 LT4356CMS-1#PBF meets industry standards.
7.What is the process for return or replacement of LT4356CMS-1#PBF?
All LT4356CMS-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT4356CMS-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 LT4356CMS-1#PBF part is unused and in its original packaging.
Return procedure for LT4356CMS-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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