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Analog Devices Inc. LTC4353IDE#PBF
- Part No.:
- LTC4353IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC4353IDE#PBF.pdf
- Description:
- IC OR CTRLR LOAD SHARE 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
LTC4353IDE#PBF 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, regulates forward voltage drop to 12mV typical at 12V, achieves 1µs gate turn-on/turn-off, and delivers up to 10A per channel in redundant power systems for telecom infrastructure.
For engineers reviewing the LTC4353IDE#PBF datasheet, LTC4353IDE#PBF pinout, LTC4353IDE#PBF application, or LTC4353IDE#PBF equivalent, this page provides verified functional context, validated package mapping to the 16-pin DFN (4mm × 3mm), confirmed thermal performance (θJA = 43°C/W), real-world MOSFET drive capability with Si4126DY, and precise enable/status logic behavior under supply failure conditions.
Technical Context
The LTC4353IDE#PBF integrates two independent servo amplifiers (SA1/SA2) that regulate GATE–VIN to maintain a fixed forward voltage drop (VFR = 12mV typ at 12V) across external N-MOSFETs, enabling smooth current transfer during supply switchover. Each channel features fast 1µs propagation delay for both turn-on and turn-off, driven by internal 3MHz charge pumps feeding CPO pins.
It includes dedicated EN1/EN2 inputs with 600mV threshold and 8mV hysteresis, ONST1/ONST2 status outputs pulled low when GATE–VIN exceeds 0.7V, and an internal LDO generating 5V at VCC from the higher VIN input. The device supports operation down to 0V VIN when externally powered via VCC (2.9V–6V), with absolute maximum ratings of −2V to 24V on VIN/OUT pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 18V; enables direct use with 3.3V, 5V, 12V, and 15V rails without external bias |
| VFR (Forward Regulation) | 12mV typical at 12V; ensures <30mV total drop at 10A with RDS(ON) ≤3mΩ MOSFETs like Si4126DY |
| tON/tOFF | 1µs max gate propagation delay; minimizes output voltage droop (<50mV) during 8A switchover |
| Gate Drive Current | ±1.4A peak pull-up/pull-down; fully enhances logic-level N-MOSFETs within 1µs |
| VCC Regulator | 5.0V ±0.5V output; powers internal circuitry from highest VIN, eliminating need for external bias above 2.9V |
| Operating Temp | −40°C to +85°C; qualified for industrial and telecom base station environments |
| Package | 16-pin DFN (4mm × 3mm); exposed pad improves thermal dissipation (θJA = 43°C/W) |
Pinout & Package
Package: 16-pin plastic DFN (4mm × 3mm) with exposed pad (Pin 17), JEDEC MO-229 compliant. Thermal resistance θJA = 43°C/W; recommended PCB layout uses soldered exposed pad for optimal heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Enable input | Active-low control (threshold 600mV); pulls MOSFET gate off when >0.6V, reducing quiescent current to 190µA |
| GATE1 / GATE2 | MOSFET gate driver | ±1.4A peak current; clamped to VIN +12V / VIN −0.7V; drives Si4126DY with full enhancement in 1µs |
| OUT1 / OUT2 | Output voltage sense | Feedback node for servo amplifier; connects to load side of MOSFET to regulate VFWD = VIN − OUT |
| VIN1 / VIN2 | Input supply sense | Sense point for input rail; highest VIN powers internal 5V LDO; supports 0V operation with external VCC |
| CPO1 / CPO2 | Charge pump output | Connects to capacitor (e.g., 56nF) for fast gate pull-up; stores energy used during 1µs turn-on events |
| ONST1 / ONST2 | Status output | Open-drain output pulled low when GATE–VIN >0.7V; indicates MOSFET conduction state for system monitoring |
| VCC | Internal regulator input/output | Provides 5V regulated supply; accepts external 2.9V–6V bias when both VIN <2.9V |
| GND | Ground reference | Common return for all analog and digital circuitry; exposed pad must be connected to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ideal diode control | Enables true ORing of two independent 0V–18V supplies with no cross-conduction or reverse-current transients |
| 12mV forward regulation at 12V | Reduces conduction loss by >90% vs. Schottky diodes (e.g., 0.35W vs. 3.5W at 10A/12V) |
| 1µs gate switching | Prevents >50mV output droop during 8A supply switchover in telecom hot-swap applications |
| Integrated 3MHz charge pumps | Eliminates need for external gate drivers; enables fast turn-on using only 56nF CPO capacitors |
| −40°C to +85°C temperature grade | Qualified for deployment in industrial servers, MicroTCA chassis, and outdoor telecom equipment |
Applications
| Redundant Power Supplies | Supply Holdup for Data Backup |
|---|---|
|
Use Scenario: Dual 12V power modules feeding a server backplane with automatic failover. IC Role / Device Role / Timing Role: LTC4353IDE#PBF controls Si4126DY MOSFETs to emulate zero-drop diodes, enabling seamless switchover within 1µs when one supply fails. Use Value: Eliminates 0.35V Schottky drop, saving >3W per channel at 10A and removing need for heat sinks in 1U chassis. |
Use Scenario: 12V system with supercapacitor bank maintaining DRAM state during AC brownout. IC Role / Device Role / Timing Role: LTC4353IDE#PBF enables holdup path from backup supply while blocking reverse current into failing main rail. Use Value: Maintains regulated 12V output for >100ms using 3F reservoir; prevents data corruption during grid interruption. |
| Telecom Line Card Protection | MicroTCA Redundancy System |
|
Use Scenario: Plug-in card receiving 12V and 3.3V from backplane with independent ORing per rail. IC Role / Device Role / Timing Role: LTC4353IDE#PBF manages dual-rail ideal diode paths, isolating faults while preserving uptime. Use Value: Prevents single-point failure propagation; supports hot-swap compliance with <1µs fault response. |
Use Scenario: MicroTCA AdvancedMC carrier with dual power modules feeding payload cards via backplane. IC Role / Device Role / Timing Role: LTC4353IDE#PBF implements ORing at each card slot, ensuring continuous 12V delivery during module replacement. Use Value: Meets PICMG 3.0 availability requirements; eliminates manual jumper configuration for redundancy. |
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; lacks CPO charge pump; slower 5µs turn-on; no VCC LDO - requires external bias | Lower-cost solution for non-critical holdup where 1µs response is unnecessary | Select LTC4353IDE#PBF when fast switchover, integrated VCC regulation, or high-current (≥10A) operation is required |
| LTC4357IDDB#PBF | Single-channel, 9V–80V range; no CPO; 100ns turn-off; designed for high-voltage battery backup | Targeted at 24V/48V telecom battery systems, not low-voltage ORing | Choose LTC4353IDE#PBF for dual-channel 0V–18V redundancy; LTC4357 for single high-voltage backup paths |
Compared with LTC4352 and LTC4357, the LTC4353IDE#PBF uniquely combines dual-channel 1µs switching, integrated 5V VCC LDO, and CPO-assisted gate drive - making it the only option qualified for high-availability 12V/3.3V ORing in space-constrained DFN packages.
Availability
LTC4353IDE#PBF is available at Aetrix Electronics and suitable for redundant power supplies, telecom line card holdup, and MicroTCA chassis requiring stable component supply across industrial temperature ranges.
Supply support for LTC4353IDE#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 technical and manufacturing continuity for all PowerPath and ideal diode controller products.
The LTC4353IDE#PBF belongs to Linear's PowerPath family, engineered specifically for high-availability power system architectures requiring seamless supply ORing, holdup, and fault isolation in telecom, server, and industrial infrastructure.
FAQ
What is the minimum input voltage supported by the LTC4353IDE#PBF?
The LTC4353IDE#PBF supports input voltages down to 0V on VIN1/VIN2 when an external 2.9V–6V supply is applied to the VCC pin. Without external VCC, the device requires at least 2.9V on either VIN input to power its internal 5V LDO regulator. This dual-mode operation enables use in ultra-low-voltage backup scenarios such as 1.2V CPU rail holdup, as demonstrated in Typical Application TA06.
How does the LTC4353IDE#PBF prevent reverse current during supply failure?
The LTC4353IDE#PBF detects reverse current flow by monitoring the forward voltage polarity (VFWD = VIN − OUT). When VFWD drops below −0.3V, its servo amplifier triggers 1µs gate turn-off, pulling the MOSFET gate to VIN potential via 1.4A internal pull-down. This action limits reverse current transients to <100ns duration, protecting upstream supplies and downstream loads - a critical feature verified in Figure TA01b waveform analysis.
Which MOSFETs are validated for use with the LTC4353IDE#PBF?
The Si4126DY SO-8 N-channel MOSFET is explicitly validated in the LTC4353IDE#PBF datasheet (page 10, Design Example) for 10A operation. Its 2.8mΩ RDS(ON), 30V BVDSS, and 20V VGS(MAX) meet all LTC4353IDE#PBF requirements: gate clamp compatibility (≤14V), safe voltage margin, and minimal conduction loss (0.28W at 10A). Other compatible parts include Vishay SI7157DP and Infineon BSC014N04LS.
Can the LTC4353IDE#PBF operate with mismatched input voltages like 5.2V and 5.0V?
Yes - the LTC4353IDE#PBF is specifically characterized for mismatched inputs, as shown in Typical Application TA01b (VIN1 = 5.2V, VIN2 = 5.0V, IL = 8A). Its servo amplifiers independently regulate each channel's forward drop to 12mV, ensuring smooth current transfer without oscillation or shoot-through. The 1µs response time prevents output droop exceeding 50mV during switchover between closely spaced rails.
What is the purpose of the CPO pins on the LTC4353IDE#PBF?
The CPO1 and CPO2 pins connect to external capacitors (e.g., 56nF) that store charge from internal 3MHz charge pumps. During fast turn-on events, this stored energy rapidly pulls up the GATE pins to fully enhance the MOSFET within 1µs - a capability absent in simpler controllers like LTC4352. Leaving CPO open disables fast turn-on, reverting to standard 5µs response.
LTC4353IDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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-DFN (4x3)
LTC4353IDE#PBF FAQ
1.How can I place an order for LTC4353IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4353IDE#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 LTC4353IDE#PBF reliable?
The price and inventory of LTC4353IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4353IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC4353IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4353IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4353IDE#PBF?
LTC4353IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4353IDE#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 LTC4353IDE#PBF?
For technical support, including LTC4353IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4353IDE#PBF requirements.
6.How does Aetrix verify that LTC4353IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC4353IDE#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 LTC4353IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC4353IDE#PBF?
All LTC4353IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4353IDE#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 LTC4353IDE#PBF part is unused and in its original packaging.
Return procedure for LTC4353IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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