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Analog Devices Inc. LTC4358CFE#TRPBF
- Part No.:
- LTC4358CFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC4358CFE#TRPBF.pdf
- Description:
- IC OR CTRLR N+1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
LTC4358CFE#TRPBF from Analog Devices (formerly Linear Technology) is a 5A positive-voltage ideal diode controller with integrated 20mΩ N-channel MOSFET, designed for diode-OR and high-current redundancy applications in telecom, automotive, and industrial power systems. It operates from 9V to 26.5V, delivers 0.5μs turn-off time, regulates forward voltage drop to 25mV, and eliminates reverse DC current.
For engineers reviewing the LTC4358CFE#TRPBF datasheet, LTC4358CFE#TRPBF pinout, LTC4358CFE#TRPBF application, or LTC4358CFE#TRPBF equivalent, key selection criteria include its 16-lead TSSOP package, 0°C to 70°C temperature grade, internal MOSFET RDS(ON) of 20mΩ, smooth switchover without oscillation, and fast fault response in N+1 redundant supplies.
Technical Context
The LTC4358CFE#TRPBF implements a precision 25mV source-drain regulation loop using an internal amplifier and charge pump to drive the gate of its integrated N-channel MOSFET. This architecture ensures stable current sharing between parallel power sources without oscillation during switchover.
Its fast pulldown circuit actively clamps the GATE pin to IN within 500ns upon reverse current detection, limiting peak fault current. The DRAIN pin is the exposed thermal pad-electrically connected to OUT-and serves as both MOSFET drain and primary heat dissipation path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Voltage Range | 9V to 26.5V - supports standard 12V and 24V industrial/telecom rails without external regulators. |
| Continuous Current Rating | 5A - enables replacement of Schottky diodes in high-power ORing paths without forced air or heatsinks. |
| RDS(ON) | 20mΩ (typ) - reduces conduction loss to ≤500mW at 5A, versus ≥2.5W for 0.5V Schottky diodes. |
| Turn-Off Time | 0.5μs - limits reverse fault current surge and protects downstream loads during supply short events. |
| Forward Drop Regulation | 25mV - enables precise load sharing across multiple LTC4358CFE#TRPBF units via droop-based current balancing. |
| Package & Temp Grade | 16-Lead TSSOP, 0°C to 70°C - RoHS-compliant, tape-and-reel packaged for automated SMT assembly. |
| Reverse Current Blocking | No reverse DC current - prevents backfeed from healthy supplies into failed sources, enhancing system safety. |
Pinout & Package
Package: 16-Lead Plastic TSSOP (4.4mm width), with exposed thermal pad (DRAIN) on bottom surface. Pin 1 marked by dot; pin 17 is DRAIN (exposed pad), electrically tied to OUT (Pin 10).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pins 1–4, 9) | Anode input / fast pulldown return | Senses input voltage; returns fast pulldown current during reverse flow; multiple pins reduce trace resistance in high-current paths. |
| OUT (Pin 10) | Cathode output / common OR node | Connects to load and DRAIN pad; serves as shared output when multiple LTC4358CFE#TRPBF devices are paralleled. |
| VDD (Pin 16) | Internal supply input | Powered from OUT; requires RC hold-up (100Ω + 0.1μF) or ≥39μF local bypass to maintain fast turn-off during input shorts. |
| GATE (Pin 6) | MOSFET gate driver output | Drives internal N-FET gate; pulled down rapidly to IN during fault to ensure sub-500ns turn-off. |
| DRAIN (Pin 17 / Exposed Pad) | MOSFET drain / thermal interface | Electrically identical to OUT; must be soldered to large PCB copper area for thermal management and accuracy. |
| GND (Pin 8) | Signal and power ground reference | Reference for all internal amplifiers and comparators; must be low-impedance connection to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 20mΩ N-channel MOSFET | Eliminates external FET layout complexity and gate drive design; reduces BOM count and board space vs discrete controllers. |
| 25mV regulated forward drop | Enables predictable, oscillation-free current sharing across parallel power supplies without external resistors or tuning. |
| 0.5μs turn-off time | Minimizes energy delivered during reverse faults, protecting downstream capacitors and preventing bus collapse. |
| No reverse DC current | Prevents backfeeding into failed supplies, eliminating need for additional blocking diodes or isolation logic. |
| 16-pin TSSOP with exposed DRAIN pad | Provides superior thermal performance over DFN variants (θJA = 38°C/W); compatible with standard SMT reflow profiles. |
Applications
| Telecom Power Redundancy | Automotive 12V System ORing |
|---|---|
|
Use Scenario: Dual 12V hot-swap power modules feeding a base station line card. IC Role / Device Role / Timing Role: Ideal diode controller managing seamless switchover between active and standby supplies during module insertion/removal. Use Value: Prevents brownouts during switchover and blocks reverse current if one module fails shorted, maintaining uninterrupted 12V bus operation. |
Use Scenario: ORing battery and alternator outputs in commercial vehicle infotainment head units. IC Role / Device Role / Timing Role: Replaces dual Schottky diodes to eliminate 0.5V forward drop and associated heat generation. Use Value: Increases available voltage margin for sensitive audio processors and reduces thermal stress on PCB near dashboard electronics. |
| Industrial PLC Power Backup | High-Availability Server Midplane |
|
Use Scenario: Parallel 24V DC power supplies feeding programmable logic controller I/O modules. IC Role / Device Role / Timing Role: Enables N+1 redundancy with automatic load redistribution upon supply failure. Use Value: Maintains full I/O functionality during single-supply outage; 25mV regulation ensures no current hogging or instability. |
Use Scenario: Backplane-level ORing of redundant 12V VRM outputs in enterprise servers. IC Role / Device Role / Timing Role: Acts as per-slot ideal diode to isolate faulty VRMs while sustaining total midplane current. Use Value: Limits fault propagation, avoids cascading shutdowns, and supports live VRM replacement without server reboot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4357HDE#TRPBF | Higher voltage rating (up to 80V), same 0.5μs turn-off, but uses external MOSFET and lacks integrated 20mΩ FET. | Required for 48V telecom or industrial systems; adds layout complexity and gate drive design effort. | Select LTC4357HDE#TRPBF only when operating above 26.5V or requiring higher fault tolerance than LTC4358CFE#TRPBF supports. |
| LTC4352CMS#TRPBF | Wider input range (0V to 18V), integrated monitor output, but rated for 3A max and uses 16-lead MSOP package with lower thermal capability. | Suitable for low-voltage embedded systems (e.g., 5V/12V FPGA boards) where current demand is ≤3A and monitoring is critical. | Choose LTC4352CMS#TRPBF for sub-3A, low-voltage designs needing real-time current monitoring-not for 5A 12V/24V ORing. |
Compared with LTC4357HDE#TRPBF and LTC4352CMS#TRPBF, the LTC4358CFE#TRPBF uniquely balances 5A capacity, integrated 20mΩ FET, 9V–26.5V operation, and TSSOP thermal performance-making it optimal for cost-sensitive, high-reliability 12V/24V redundancy without external FET design overhead.
Availability
LTC4358CFE#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, automotive control units, and industrial PLCs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4358CFE#TRPBF 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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio. Linear's legacy ICs emphasize robustness, accuracy, and ease of use in demanding power applications.
The LTC4358CFE#TRPBF belongs to Linear's ideal diode controller family, engineered specifically to replace Schottky diodes in high-current ORing and redundancy architectures-reducing power loss, heat, and PCB area while ensuring fast fault response.
FAQ
What is the maximum continuous current rating for the LTC4358CFE#TRPBF?
The LTC4358CFE#TRPBF is rated for 5A continuous current under typical thermal conditions with proper PCB copper area. Its internal 20mΩ N-channel MOSFET produces ≤500mW conduction loss at 5A, enabling reliable operation without heatsinks in well-designed layouts. Derating applies above 70°C ambient or with insufficient copper area.
Does the LTC4358CFE#TRPBF require an external MOSFET?
No, the LTC4358CFE#TRPBF integrates a 20mΩ N-channel MOSFET and requires no external pass transistor. Unlike controllers such as LTC4357 or LT4351, it delivers complete ideal diode functionality-including gate drive, regulation, and fast turn-off-in a single 16-lead TSSOP package.
What is the purpose of the DRAIN pin (Pin 17) on the LTC4358CFE#TRPBF?
The DRAIN pin on the LTC4358CFE#TRPBF is the exposed thermal pad on the bottom of the TSSOP package, electrically connected to the internal MOSFET's drain and to the OUT pin (Pin 10). It must be soldered to a large PCB copper area for thermal dissipation and accurate regulation-failure to do so degrades RDS(ON) stability and turn-off timing.
Can the LTC4358CFE#TRPBF operate with input voltages below 9V?
No, the LTC4358CFE#TRPBF has a minimum operating supply voltage of 9V as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 9V is not guaranteed and may result in improper regulation, increased RDS(ON), or failure to turn on the internal MOSFET reliably.
How does the LTC4358CFE#TRPBF achieve smooth switchover without oscillation?
The LTC4358CFE#TRPBF achieves smooth switchover by regulating the source-drain voltage drop across its internal MOSFET to a precise 25mV using a high-gain amplifier and charge pump. This closed-loop control prevents current hogging and eliminates the hysteresis-induced oscillation common in comparator-based ORing solutions.
LTC4358CFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- N+1 ORing Controller
- FET Type:
- N-Channel
- Ratio - Input:Output:
- N:1
- Internal Switch(s):
- Yes
- Delay Time - ON:
- 200 µs
- Delay Time - OFF:
- 300 ns
- Current - Output (Max):
- 5A
- Current - Supply:
- 600 µA
- Voltage - Supply:
- 9V ~ 26.5V
- Applications:
- N+1 Power Supplies, High Availability
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
LTC4358CFE#TRPBF FAQ
1.How can I place an order for LTC4358CFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4358CFE#TRPBF 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 LTC4358CFE#TRPBF reliable?
The price and inventory of LTC4358CFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4358CFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4358CFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4358CFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4358CFE#TRPBF?
LTC4358CFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4358CFE#TRPBF 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 LTC4358CFE#TRPBF?
For technical support, including LTC4358CFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4358CFE#TRPBF requirements.
6.How does Aetrix verify that LTC4358CFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4358CFE#TRPBF 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 LTC4358CFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4358CFE#TRPBF?
All LTC4358CFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4358CFE#TRPBF, 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 LTC4358CFE#TRPBF part is unused and in its original packaging.
Return procedure for LTC4358CFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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