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Analog Devices Inc. LTC4353CMS#TRPBF
- Part No.:
- LTC4353CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4353CMS#TRPBF.pdf
- Description:
- IC OR CTRLR N-CH 2CH 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,120
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Product details
Overview
LTC4353CMS#TRPBF from Analog Devices (formerly Linear Technology) is a dual low-voltage ideal diode controller that replaces Schottky diodes in ORing and holdup applications using external N-channel MOSFETs. It operates from 2.9V to 18V input supplies, delivers up to 10A per channel, regulates forward voltage drop to 25mV typical, and features 1µs gate turn-on/turn-off for fast supply switchover in redundant power systems.
For engineers reviewing the LTC4353CMS#TRPBF datasheet, LTC4353CMS#TRPBF pinout, LTC4353CMS#TRPBF application, or LTC4353CMS#TRPBF equivalent, key selection criteria include its 16-pin MSOP package, dual independent enable inputs, MOSFET on-status outputs, fast gate drive capability, and compatibility with logic-level N-channel MOSFETs such as Si4126DY in telecom and server power architectures.
Technical Context
The LTC4353CMS#TRPBF integrates two independent servo amplifiers (SA1, SA2) that regulate the forward voltage drop (VIN − OUT) across external N-channel MOSFETs to a precise 25mV typical value, enabling low-loss power path control. Each channel includes dedicated charge pump outputs (CPO1/CPO2), gate drivers (GATE1/GATE2), and status outputs (ONST1/ONST2).
It employs internal 3MHz charge pumps to support fast gate pull-up during switchover, with clamped GATE–VIN voltage range of −0.3V to +12V. The device uses an internal LDO to generate a regulated 5V VCC supply from the higher VIN input, and requires external VCC only when both VIN inputs fall below 2.9V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.9V to 18V per input; supports 0V–18V ORing when externally powered at VCC |
| Forward Regulation Voltage | 25mV typical at 12V VIN; ensures <30mV drop at 10A with RDS(ON) ≤3mΩ MOSFET |
| Gate Turn-On/Off Time | 1µs propagation delay; minimizes output voltage droop during supply switchover |
| Output Current Capability | 10A per channel; determined by external MOSFET and PCB layout, not IC-limited |
| VCC Regulation | 5.0V ±0.5V internal LDO; powers internal circuitry and enables operation without external bias above 2.9V |
| Enable Threshold | 600mV typical with 8mV hysteresis; allows clean digital or analog enable control with noise immunity |
| Operating Temperature | 0°C to 70°C ambient; validated for commercial-grade industrial and telecom power systems |
Pinout & Package
Package: 16-pin plastic MSOP (3.0mm × 4.9mm), exposed pad optional, θJA = 125°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Channel Enable Input | Pull below 600mV to activate corresponding MOSFET; high-impedance input with 8mV hysteresis |
| GATE1 / GATE2 | MOSFET Gate Driver Output | Drives external N-channel gate with ±1.4A peak current; clamped to VIN ±12V |
| CPO1 / CPO2 | Charge Pump Output | Connects to VIN via capacitor (e.g., 56nF); stores energy for fast gate pull-up during switchover |
| OUT1 / OUT2 | Load-Side Voltage Sense | Feedback node for forward-voltage regulation; connects directly to load side of MOSFET |
| VIN1 / VIN2 | Supply-Side Voltage Sense | Sense input for each power source; highest VIN powers internal 5V LDO for VCC |
| ONST1 / ONST2 | MOSFET On-Status Output | Open-drain output pulled low when GATE–VIN > 0.7V; indicates active conduction path |
| VCC | Internal Regulator Supply | 5V output (regulated) or input (2.9V–6V); bypassed with 0.1µF capacitor to GND |
| GND | Device Ground Reference | Primary return path for all internal circuits and gate drive sink currents |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Ideal Diode Control | Enables simultaneous ORing of two independent supplies with no cross-talk or shared regulation |
| Fast 1µs Gate Switching | Reduces output voltage droop to <50mV during 10A switchover in 12V systems |
| Integrated Charge Pump Architecture | Eliminates need for external high-voltage bias rails; enables use of standard logic-level MOSFETs |
| On-Status Outputs with Built-in Pull-Up | Provides direct LED or microcontroller interface for real-time MOSFET conduction monitoring |
| Wide Input Voltage Range Support | Operates down to 0V input when VCC is externally supplied, enabling brownout holdup in 3.3V/1.2V systems |
Applications
| Redundant Telecom Power Supplies | Server Backplane ORing |
|---|---|
|
Use Scenario: Dual 12V AC/DC supplies feeding a network switch backplane with hot-swap capability. IC Role / Device Role / Timing Role: LTC4353CMS#TRPBF controls two Si4126DY MOSFETs to provide seamless switchover between supplies while blocking reverse current during failure. Use Value: Eliminates 0.4V Schottky losses per rail, reducing heat generation by >4W at 10A and enabling higher density board layouts. |
Use Scenario: MicroTCA carrier board with dual 12V power modules delivering uninterrupted power to payload cards. IC Role / Device Role / Timing Role: LTC4353CMS#TRPBF acts as intelligent ORing controller with independent EN inputs for module health signaling and fault isolation. Use Value: Achieves <1µs switchover time to maintain PCIe link stability during supply transitions, meeting PICMG 3.0 holdup requirements. |
| Industrial PLC Power Holdup | SSD Data Backup Circuitry |
|
Use Scenario: Programmable logic controller requiring 20ms holdup during AC mains interruption using supercapacitor bank. IC Role / Device Role / Timing Role: LTC4353CMS#TRPBF enables bidirectional holdup path: main supply → load, and backup cap → load, with fast turn-off to prevent cap discharge into failed supply. Use Value: Supports 0V–18V operation with external VCC, allowing direct integration with 3.3V or 5V auxiliary rails for control logic. |
Use Scenario: Solid-state drive with 3F reservoir capacitor maintaining write cache power during sudden 12V rail collapse. IC Role / Device Role / Timing Role: LTC4353CMS#TRPBF isolates main 12V supply from backup cap during normal operation, then enables cap-to-load path within 1µs of fault detection. Use Value: Prevents data corruption by guaranteeing >100ms holdup at 3A load with <30mV forward drop, minimizing voltage sag at NAND controller input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4352IMS#TRPBF | 12-pin MSOP; single-supply UV/OV monitoring; no charge pump; 12V max VIN | Lacks fast switchover and holdup capability; suited for simpler ORing without transient response demands | Select when cost-sensitive designs require basic ORing without 1µs switching or 18V support |
| LTC4370CMS#TRPBF | 16-pin MSOP; current-sharing control; dual independent current limits; 0V–18V range | Supports active current balancing between supplies; adds I²R sensing and adjustable share resistors | Choose when parallel supply loading must be balanced to within 5%, not just ORed |
Compared with LTC4353CMS#TRPBF, LTC4352IMS#TRPBF offers lower channel count and no charge pump-reducing BOM cost but sacrificing fast turn-on. LTC4370CMS#TRPBF adds current sharing at the expense of increased design complexity and external resistor network requirements.
Availability
LTC4353CMS#TRPBF is available at Aetrix Electronics and suitable for redundant telecom power supplies, server backplane ORing, industrial PLC holdup, SSD data backup, and MicroTCA carrier applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for LTC4353CMS#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 full product continuity, technical documentation, and manufacturing for legacy Linear parts including the LTC4353 series.
The LTC4353CMS#TRPBF belongs to Linear's PowerPath™ family of ideal diode controllers, designed specifically for high-reliability ORing and holdup in telecom infrastructure, enterprise servers, and industrial power systems where efficiency, switchover speed, and thermal performance are critical.
FAQ
What is the maximum continuous current supported by the LTC4353CMS#TRPBF?
The LTC4353CMS#TRPBF itself does not limit current-it drives external N-channel MOSFETs whose RDS(ON) and thermal design determine system current capacity. With appropriate MOSFETs (e.g., Si4126DY) and PCB layout, the LTC4353CMS#TRPBF supports ≥10A per channel continuously. Thermal performance depends on θJA of the MSOP package (125°C/W) and heatsinking of the external FETs.
Can the LTC4353CMS#TRPBF operate with input voltages below 2.9V?
Yes-the LTC4353CMS#TRPBF supports 0V–18V input operation when an external 2.9V–6V supply is applied to the VCC pin. This enables use in 1.2V, 3.3V, or 5V holdup systems where input rails may sag below 2.9V. The internal LDO is disabled in this mode, and VCC must be bypassed with a 0.1µF capacitor.
How does the LTC4353CMS#TRPBF achieve 1µs gate switching?
The LTC4353CMS#TRPBF achieves 1µs gate switching using internal 3MHz charge pumps that pre-charge CPO1/CPO2 capacitors. During switchover, stored charge rapidly pulls up the GATE pin with ±1.4A peak current. Fast turn-off is enabled by strong internal pull-down circuitry discharging GATE to VIN, all while maintaining GATE–VIN clamping within −0.3V to +12V.
What MOSFET parameters are critical when selecting devices for use with the LTC4353CMS#TRPBF?
Critical MOSFET parameters for LTC4353CMS#TRPBF include: BVDSS > maximum input voltage (e.g., >18V), VGS(MAX) > 14V (to withstand internal GATE–VIN clamp), and RDS(ON) selected to meet forward-drop targets (e.g., ≤3mΩ for 30mV @10A). CISS also matters-CPO capacitor should be ~10× CISS (e.g., 56nF for Si4126DY's 5500pF).
Does the LTC4353CMS#TRPBF provide reverse-current protection during supply failure?
Yes-the LTC4353CMS#TRPBF detects reverse current flow by monitoring the polarity of VFWD = VIN − OUT. When VFWD becomes negative (indicating reverse conduction), the servo amplifier immediately pulls down the corresponding GATE pin with 1.4A sink current, turning off the MOSFET within 1µs to block damaging reverse transients and protect upstream supplies.
LTC4353CMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Current Sharing Controller
- FET Type:
- N-Channel
- Ratio - Input:Output:
- 2:2
- Internal Switch(s):
- No
- Delay Time - ON:
- 400 ns
- Delay Time - OFF:
- 300 ns
- Current - Output (Max):
- -
- Current - Supply:
- 1.5 mA
- Voltage - Supply:
- 2.9V ~ 18V
- Applications:
- Redundant Power Supplies, Telecom Infrastructure
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LTC4353CMS#TRPBF FAQ
1.How can I place an order for LTC4353CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4353CMS#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 LTC4353CMS#TRPBF reliable?
The price and inventory of LTC4353CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4353CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4353CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4353CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4353CMS#TRPBF?
LTC4353CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4353CMS#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 LTC4353CMS#TRPBF?
For technical support, including LTC4353CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4353CMS#TRPBF requirements.
6.How does Aetrix verify that LTC4353CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4353CMS#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 LTC4353CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4353CMS#TRPBF?
All LTC4353CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4353CMS#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 LTC4353CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC4353CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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