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Analog Devices Inc. LTC4353IMS#PBF
- Part No.:
- LTC4353IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 16-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC4353IMS#PBF.pdf
- Description:
- IC OR CTRLR LOAD SHARE 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:316
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Product details
Overview
LTC4353IMS#PBF from Analog Devices (formerly Linear Technology) is a dual low-voltage ideal diode controller that drives external N-channel MOSFETs to replace Schottky diodes in ORing and holdup applications. It operates from 2.9V to 18V input supplies, regulates forward voltage drop to 12mV typical at 12V, achieves 1µs gate turn-on/off, and delivers up to 10A per channel in redundant power systems for telecom infrastructure.
For engineers reviewing the LTC4353IMS#PBF datasheet, LTC4353IMS#PBF pinout, LTC4353IMS#PBF application, or LTC4353IMS#PBF equivalent, key selection criteria include its dual-channel MOSFET gate drive capability, VFR regulation accuracy, fast transient response during supply switchover, ONST status outputs for system monitoring, and MSOP-16 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The LTC4353IMS#PBF implements two independent servo amplifiers (SA1/SA2) that regulate the gate voltage of external N-channel MOSFETs to maintain a precise forward voltage drop (VFR = 12mV typ at 12V), enabling smooth current transfer without reverse-current transients. Each channel features dedicated EN inputs, ONST status outputs, and CPO charge pump pins for fast gate turn-on.
It integrates a 5V LDO powered from the higher VIN input, supports external VCC supply down to 2.9V when both inputs fall below that threshold, and includes internal clamps limiting GATE/CPO to 12V above corresponding VIN. The device uses comparator-based enable logic with 600mV threshold and 8mV hysteresis on EN1/EN2 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 18V per channel; enables operation across 12V telecom and 3.3V server rails without external bias. |
| VFR Regulation | 12mV typical at 12V input; ensures <30mV total forward drop at 10A with 3mΩ RDS(ON) MOSFETs. |
| GATE Turn-On/Off | 1µs propagation delay; minimizes output voltage droop (<50mV) during 8A switchover in ORing systems. |
| ONST Output Logic | Pulled low when GATE–VIN > 0.7V; provides direct MOSFET conduction status for fault logging or LED indication. |
| Operating Temp | –40°C to +85°C; qualified for industrial-grade embedded systems and telecom equipment deployment. |
| Package | 16-pin plastic MSOP; 3mm × 4.9mm footprint with exposed pad option for thermal management in high-current layouts. |
| VCC Regulator | Internal 5V LDO (±0.5V) powered from higher VIN; eliminates need for external bias unless both VIN < 2.9V. |
Pinout & Package
Package: 16-pin plastic MSOP (3.00mm × 4.90mm), exposed pad optional, θJA = 125°C/W, rated for –40°C to +85°C ambient operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Enable input | Active-low control (600mV threshold); pulls MOSFET gate off when >0.6V, reducing quiescent current to 190µA. |
| GATE1 / GATE2 | MOSFET gate driver | Sources 1.4A fast pull-up from CPO, sinks 1.4A fast pull-down to VIN; clamped ±12V relative to VIN. |
| OUT1 / OUT2 | Output voltage sense | Feedback node for servo amplifier; senses load-side voltage to regulate VFWD = VIN − OUT to VFR. |
| VIN1 / VIN2 | Input supply sense | Primary power path inputs; highest VIN powers internal 5V VCC regulator; supports 0V to 18V operation. |
| ONST1 / ONST2 | Status output | Open-drain output pulled low when GATE–VIN > 0.7V; indicates MOSFET conduction for system monitoring. |
| CPO1 / CPO2 | Charge pump output | Connects to external capacitor (e.g., 56nF) for fast gate turn-on; charged by internal 3MHz pump. |
| VCC | Supply rail | 5V regulated output (4.5–5.5V); bypassed with 0.1µF capacitor; requires external 2.9–6V supply if both VIN < 2.9V. |
| GND | Ground reference | Common return for all analog and digital circuitry; connects to PCB ground plane for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ideal diode control | Enables simultaneous ORing of two independent power sources (e.g., main + battery) with no cross-conduction. |
| 12mV forward regulation accuracy | Reduces power loss vs. Schottky diodes: at 10A, dissipation drops from ~3W (0.3V × 10A) to ~0.12W (12mV × 10A). |
| 1µs gate switching speed | Prevents >50mV output droop during 8A supply switchover, critical for maintaining 12V server rail stability. |
| Integrated 5V VCC LDO | Eliminates external bias supply in most applications; powered automatically from higher VIN input. |
| ONST status outputs | Direct MOSFET conduction indicators enable real-time fault detection and LED status signaling without MCU polling. |
Applications
| Redundant Telecom Power Supplies | Server Supply Holdup |
|---|---|
|
Use Scenario: Dual 12V AC/DC supplies feeding a base station backplane with hot-swap capability. IC Role / Device Role / Timing Role: Ideal diode controller managing parallel power paths; prevents reverse current during supply failure. Use Value: Enables seamless switchover with <50mV droop at 10A, eliminating heat sink requirements for Schottky diodes. |
Use Scenario: Maintaining 12V system operation during brief AC brownouts using supercapacitor reservoir. IC Role / Device Role / Timing Role: Controls MOSFETs to isolate failing input while sustaining load via holdup capacitor. Use Value: Fast 1µs turn-off blocks reverse current into failing supply, preserving holdup energy for >10ms backup. |
| MicroTCA Carrier Boards | Industrial PLC Power Redundancy |
|
Use Scenario: ORing 12V inputs from two independent MicroTCA power modules onto a carrier board. IC Role / Device Role / Timing Role: Dual-channel controller ensuring load continuity during module insertion/removal. Use Value: EN inputs allow software-controlled disable of individual channels for maintenance without interrupting power. |
Use Scenario: Dual 24V DC inputs powering programmable logic controllers in factory automation. IC Role / Device Role / Timing Role: Prevents backfeeding between supplies and isolates faults during short-circuit events. Use Value: Internal clamps protect against 24V transients; ONST outputs feed PLC watchdog circuits for fault logging. |
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#PBF | 12-pin MSOP; single-supply UV/OV monitoring; no CPO pins for fast turn-on; 12mV VFR same. | Lacks dual-channel fast switchover; suited for simpler ORing where 1µs timing not required. | Select when cost reduction and basic ORing suffice; avoid for telecom holdup requiring sub-µs response. |
| LTC4357EMS8#PBF | 8-pin MSOP; supports 9V–80V inputs; higher voltage rating but no ONST outputs or CPO charge pump. | Designed for high-voltage industrial systems; incompatible with 3.3V/12V telecom rails due to minimum 9V VIN. | Choose only for >9V applications; LTC4353IMS#PBF remains optimal for 2.9–18V dual-rail redundancy. |
Compared with LTC4352IMS#PBF and LTC4357EMS8#PBF, the LTC4353IMS#PBF uniquely combines dual-channel 1µs switching, ONST status reporting, and CPO-assisted fast turn-on within the 2.9–18V range-making it the sole fit for telecom-grade supply ORing with real-time fault visibility.
Availability
LTC4353IMS#PBF is available at Aetrix Electronics and suitable for redundant telecom power supplies, server supply holdup systems, and industrial PLC power redundancy requiring stable component supply across extended temperature ranges.
Supply support for LTC4353IMS#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 acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for legacy Linear parts including the LTC4353IMS#PBF.
The LTC4353IMS#PBF belongs to Linear's PowerPath™ ideal diode controller family, designed specifically for high-availability systems requiring zero-maintenance, low-loss power path management in telecom, server, and industrial infrastructure.
FAQ
What is the operating voltage range of the LTC4353IMS#PBF?
The LTC4353IMS#PBF operates from 2.9V to 18V on VIN1 and VIN2 inputs. When both inputs fall below 2.9V, an external 2.9V–6V supply must be applied to the VCC pin to sustain functionality. Its internal 5V LDO regulator derives power from the higher VIN input, eliminating external bias in most 3.3V/12V applications. Absolute maximum ratings extend to 24V on VIN/OUT pins.
How does the LTC4353IMS#PBF achieve fast switchover between power supplies?
The LTC4353IMS#PBF achieves 1µs gate turn-on and turn-off using internal 1.4A pull-up/pull-down drivers combined with external CPO–VIN capacitors (e.g., 56nF). During switchover, the charge stored on the CPO capacitor rapidly enhances the MOSFET gate, minimizing output voltage droop. This is validated in Figure 4353 TA01b showing <50mV droop at 8A load during 5.2V→5V transition.
What is the function of the ONST1 and ONST2 pins on the LTC4353IMS#PBF?
The ONST1 and ONST2 pins on the LTC4353IMS#PBF are open-drain status outputs pulled low when the corresponding MOSFET gate voltage exceeds VIN by >0.7V-indicating active conduction. Each pin includes a 500kΩ internal pull-up to VCC−0.5V and can drive LEDs or microcontroller GPIOs directly. They provide real-time visibility into power path health without requiring external sensing circuitry.
Can the LTC4353IMS#PBF be used with 3.3V input supplies?
Yes, the LTC4353IMS#PBF supports 3.3V inputs as part of its 2.9V–18V operating range. In 3.3V systems, the internal VCC regulator remains functional since 3.3V > 2.9V. Design Example TA03 demonstrates a 3.3V main/auxiliary ORing configuration using Si4126DY MOSFETs, with EN pins enabling auxiliary disable when main supply exceeds 2.95V.
What package type and thermal characteristics does the LTC4353IMS#PBF have?
The LTC4353IMS#PBF uses a 16-pin plastic MSOP package (3.00mm × 4.90mm) rated for –40°C to +85°C operation. Its thermal resistance is θJA = 125°C/W with standard JEDEC layout; the exposed pad is optional but recommended for high-current designs. Maximum junction temperature is 125°C, and the package complies with RoHS and lead-free finishing standards per the #PBF suffix.
LTC4353IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP
LTC4353IMS#PBF FAQ
1.How can I place an order for LTC4353IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4353IMS#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 LTC4353IMS#PBF reliable?
The price and inventory of LTC4353IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4353IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC4353IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4353IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4353IMS#PBF?
LTC4353IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4353IMS#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 LTC4353IMS#PBF?
For technical support, including LTC4353IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4353IMS#PBF requirements.
6.How does Aetrix verify that LTC4353IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4353IMS#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 LTC4353IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC4353IMS#PBF?
All LTC4353IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4353IMS#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 LTC4353IMS#PBF part is unused and in its original packaging.
Return procedure for LTC4353IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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