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Analog Devices Inc. LTC4357HMS8#PBF
- Part No.:
- LTC4357HMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4357HMS8#PBF.pdf
- Description:
- IC OR CTRLR N+1 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,995
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Product details
Overview
LTC4357HMS8#PBF from Analog Devices (formerly Linear Technology) is a positive high-voltage ideal diode controller that drives an external N-channel MOSFET to replace Schottky diodes in diode-OR and high-current power-path applications. It operates from 9V to 80V, regulates source-drain voltage to 25mV, achieves ≤500ns turn-off time, and supports –40°C to 125°C ambient operation in an 8-lead MSOP package - enabling reliable redundancy in telecom and automotive 48V systems.
For engineers reviewing the LTC4357HMS8#PBF datasheet, LTC4357HMS8#PBF pinout, LTC4357HMS8#PBF application, or LTC4357HMS8#PBF equivalent, key selection criteria include its 25mV forward-drop regulation accuracy, 0.5µs fault turn-off capability, wide 9V–80V supply range, N-channel gate drive compatibility, and high-temp industrial qualification - all critical for robust ORing in mission-critical power systems.
Technical Context
The LTC4357HMS8#PBF implements a precision 25mV source-drain voltage servo loop using IN and OUT pins to sense MOSFET conduction, dynamically adjusting GATE drive to maintain low forward drop across varying load currents. Its fast pull-down circuit activates within 500ns when reverse voltage exceeds –25mV, limiting fault current transients.
It features internal clamping of GATE-to-IN voltage to 10V–15V depending on VDD range (4.5V for 9V–20V, 12V for 20V–80V), supports logic-level and standard-threshold N-MOSFETs, and draws only 0.5–1.25mA quiescent current over temperature - making it suitable for always-on, high-reliability redundant supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 9V to 80V - enables direct use with 12V, 24V, 48V, and 60V industrial/telecom rails without external regulators. |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and base station environments requiring extended thermal margin. |
| Forward Drop Regulation | 25mV ±15mV - ensures consistent low-loss conduction and smooth switchover between parallel sources without oscillation. |
| Turn-Off Time | ≤500ns - minimizes reverse current surge during input short-circuit or supply failure, protecting downstream bus integrity. |
| Gate Drive Output | Up to 12V above IN (for VDD ≥20V) - compatible with standard 10V-threshold N-MOSFETs; includes internal clamp for safe FET gate protection. |
| Quiescent Current | 0.5mA to 1.25mA - enables low-power standby operation while maintaining full fault response capability. |
| Package | 8-Lead MSOP (3mm × 3mm) - surface-mount footprint with exposed pad option for thermal management in high-current layouts. |
Pinout & Package
Package: 8-Lead Plastic MSOP (MS8), 3mm × 3mm body, 0.65mm pitch, exposed pad optional for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN | Anode sense / Gate pull-down return | Connects to MOSFET source; senses forward/reverse voltage drop; returns fast pull-down current during fault - must be routed close to MOSFET source. |
| 2: NC | No connection | Not internally bonded - leave unconnected; no electrical function. |
| 3: NC | No connection | Not internally bonded - leave unconnected; no electrical function. |
| 4: GATE | N-MOSFET gate driver output | Drives external N-channel MOSFET gate; actively pulls up to regulate 25mV drop, pulls down hard (<500ns) for reverse fault protection. |
| 5: OUT | Cathode sense / common output node | Connects to MOSFET drain; used with multiple LTC4357HMS8#PBF devices for diode-OR; senses voltage for servo control loop. |
| 6: VDD | Positive supply input | Powered from OUT (or via RC hold-up); supplies internal circuitry; requires ≥39µF bypass for <30V, ≥100µF for >30V to prevent collapse during reverse recovery. |
| 7: NC | No connection | Not internally bonded - leave unconnected; no electrical function. |
| 8: GND | Device ground reference | System ground return for all internal circuits; exposed pad may be connected to GND for improved thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| 25mV forward-drop regulation | Enables precise, oscillation-free current sharing across parallel power sources without external compensation. |
| ≤500ns reverse-fault turn-off | Minimizes peak reverse current and bus disturbance during sudden input shorts or supply failures. |
| Wide 9V–80V operating range | Supports single-chip design across 12V, 24V, 48V, and 60V infrastructure without voltage scaling or auxiliary supplies. |
| Logic- and standard-level MOSFET support | Configurable gate drive (4.5V or 12V above IN) allows optimal FET selection for RDS(ON), cost, and thermal trade-offs. |
| –40°C to 125°C ambient rating | Validated for harsh environments including automotive engine bays and outdoor telecom cabinets. |
| No reverse DC current path | Eliminates leakage-induced bus loading and cross-conduction in multi-supply ORing configurations. |
Applications
| 48V Telecom Power Redundancy | Automotive 48V Mild Hybrid Systems |
|---|---|
|
Use Scenario: Dual 48V DC-DC converters feed a common backplane in AdvancedTCA or Open Compute Project servers. IC Role / Device Role / Timing Role: Ideal diode controller enforcing seamless switchover and preventing reverse current flow during converter failure. Use Value: Eliminates 0.4V Schottky drop, reducing power loss by >8W per 10A path and enabling smaller thermal design. |
Use Scenario: Parallel battery packs or DC-DC outputs supply 48V loads (e.g., electric turbochargers, active suspension) in vehicle chassis. IC Role / Device Role / Timing Role: High-temp-rated ORing controller ensuring uninterrupted power delivery during pack disconnection or fault. Use Value: 125°C rating and 500ns turn-off maintain bus stability during transient faults in under-hood conditions. |
| Solar Charge Controller Input Protection | Industrial PLC Power Supply ORing |
|
Use Scenario: Solar array feeds a 48V battery bank through an MPPT charger; reverse current must be blocked at night or during shading. IC Role / Device Role / Timing Role: Reverse-input blocking controller replacing series diode with ultra-low-loss MOSFET path. Use Value: 25mV regulation preserves >99% of panel voltage under load, maximizing energy harvest efficiency. |
Use Scenario: Two independent 24V industrial power supplies feed a programmable logic controller with strict uptime requirements. IC Role / Device Role / Timing Role: Diode-OR controller providing N+1 redundancy and automatic failover without manual intervention. Use Value: Smooth 25mV switchover prevents PLC reset or I/O glitch during supply transition - meeting SIL-2 functional safety margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4355IMS8#PBF | Dual-channel controller with 0.5µs turn-off, same 9V–80V range and 25mV regulation, but integrates dual independent ORing paths in one MS8 package. | Designed for two-supply ORing without external component duplication; higher channel density but fixed dual configuration. | Select LTC4355IMS8#PBF when implementing exactly two redundant inputs and board space is constrained. |
| LTC4352CMS8#PBF | Single-channel, 0V–18V input range, 25mV regulation, 1.2µs turn-off, rated for 0°C–70°C only. | Targeted at low-voltage embedded systems (e.g., 5V/12V FPGA power); lacks high-voltage tolerance and extended temperature range. | Select LTC4352CMS8#PBF only for non-automotive, non-telecom applications below 18V and 70°C ambient. |
Compared with LTC4357HMS8#PBF, LTC4355IMS8#PBF offers integrated dual-channel functionality at the cost of inflexible topology, while LTC4352CMS8#PBF sacrifices voltage range and temperature rating for lower-cost, low-voltage use - making LTC4357HMS8#PBF the sole choice for 48V/125°C industrial ORing.
Availability
LTC4357HMS8#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive 48V systems, and industrial PLC power redundancy requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LTC4357HMS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision signal chain and power applications.
The LTC4357HMS8#PBF belongs to Linear's high-voltage ideal diode controller product line, designed specifically to replace lossy Schottky diodes in redundant power architectures where efficiency, thermal management, and fault resilience are critical.
FAQ
What is the maximum input voltage rating for the LTC4357HMS8#PBF?
The LTC4357HMS8#PBF has an absolute maximum IN pin rating of –1V to 100V. Its specified operating supply range is 9V to 80V, meaning it is fully characterized and guaranteed to function correctly across that range. Operation beyond 80V is not recommended, as parameters like gate drive voltage and regulation accuracy are not validated above this limit. Always observe the 100V absolute max to avoid permanent damage.
Does the LTC4357HMS8#PBF require external components to operate?
Yes, the LTC4357HMS8#PBF requires at minimum an external N-channel MOSFET, input/output bypass capacitors, and proper PCB layout. A 100Ω/100nF RC filter on VDD is recommended if powered from the input side; ≥100µF bulk capacitance is required for VDD when operating above 30V. The GATE pin drives the MOSFET directly, but gate resistor selection affects switching speed and ringing - no bootstrap or charge-pump ICs are needed.
Can the LTC4357HMS8#PBF be used with P-channel MOSFETs?
No, the LTC4357HMS8#PBF is designed exclusively for N-channel MOSFETs. Its GATE pin drives high relative to IN to enhance the N-MOSFET, and its internal architecture relies on sensing voltage drop from IN to OUT to regulate conduction. P-channel implementation would invert the control polarity and violate the device's sensing and drive architecture. Use LTC4354 or LTC4356 for negative-rail or P-MOSFET applications.
How does the 25mV regulation work in the LTC4357HMS8#PBF?
The LTC4357HMS8#PBF continuously monitors the voltage difference between IN and OUT pins. When forward drop exceeds 25mV, it increases GATE drive to reduce RDS(ON); when drop falls below 25mV, it weakly pulls down GATE to raise RDS(ON). This closed-loop servo maintains ~25mV across the MOSFET under steady-state load, minimizing conduction loss while ensuring smooth, oscillation-free transitions during switchover between parallel supplies.
Is the exposed pad on the LTC4357HMS8#PBF package required to be connected to ground?
No, the exposed pad on the LTC4357HMS8#PBF MS8 package is optional for grounding. It may be left floating or connected to GND to improve thermal dissipation - especially beneficial in high-current (>5A) or high-ambient-temperature designs. When connected, it must be soldered to a thermally robust GND plane; when left open, ensure creepage/clearance compliance for high-voltage applications (>30V).
LTC4357HMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- N+1 ORing Controller
- FET Type:
- N-Channel
- Ratio - Input:Output:
- N:1
- Internal Switch(s):
- No
- Delay Time - ON:
- -
- Delay Time - OFF:
- 300 ns
- Current - Output (Max):
- -
- Current - Supply:
- 500 µA
- Voltage - Supply:
- 9V ~ 80V
- Applications:
- Redundant Power Supplies, Telecom Infrastructure
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
LTC4357HMS8#PBF FAQ
1.How can I place an order for LTC4357HMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4357HMS8#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 LTC4357HMS8#PBF reliable?
The price and inventory of LTC4357HMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4357HMS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC4357HMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4357HMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4357HMS8#PBF?
LTC4357HMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4357HMS8#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 LTC4357HMS8#PBF?
For technical support, including LTC4357HMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4357HMS8#PBF requirements.
6.How does Aetrix verify that LTC4357HMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4357HMS8#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 LTC4357HMS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC4357HMS8#PBF?
All LTC4357HMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4357HMS8#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 LTC4357HMS8#PBF part is unused and in its original packaging.
Return procedure for LTC4357HMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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