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Analog Devices Inc. LTC4353CDE#TRPBF
- Part No.:
- LTC4353CDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- OR Controllers, Ideal Diodes
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LTC4353CDE#TRPBF.pdf
- Description:
- IC OR CTRLR N-CH 2CH 16DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,137
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Product details
Overview
LTC4353CDE#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, regulates forward voltage drop to 2–25mV, achieves 1µs gate turn-on/turn-off, and supports up to 10A load current per channel in redundant power systems for telecom infrastructure.
For engineers reviewing the LTC4353CDE#TRPBF datasheet, LTC4353CDE#TRPBF pinout, LTC4353CDE#TRPBF application, or LTC4353CDE#TRPBF equivalent, this device enables low-loss power supply ORing, supply holdup with failing-input voltage maintenance, fast switchover under load, and MOSFET on-status monitoring - all critical for high-availability server and network equipment design.
Technical Context
The LTC4353CDE#TRPBF integrates two independent servo amplifiers (SA1/SA2) that regulate GATE–VIN to maintain precise forward voltage drop (VFR) across each external N-channel MOSFET. Its internal 3MHz charge pumps drive GATE1/GATE2 with ±1.4A peak current, enabling sub-microsecond switching while clamping gate voltage to 12V above VIN.
It features dual enable inputs (EN1/EN2) with 600mV threshold and 8mV hysteresis, ONST1/ONST2 open-drain status outputs indicating MOSFET conduction when ΔVGATE exceeds 0.7V, and an internal LDO generating 5V VCC from the higher VIN input - eliminating external bias when VIN ≥ 2.9V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.9V to 18V per input; supports 0V–18V operation with external VCC supply |
| Forward Regulation Voltage (VFR) | 2mV typical at 1.2V VIN; 25mV max at 12V VIN - enables <30mV total drop at 10A with 3mΩ RDS(ON) |
| GATE Turn-On/Off Time | 0.4–1µs propagation delay - ensures minimal output voltage droop (<50mV) during 8A switchover |
| Gate Drive Current | ±1.4A peak pull-up/pull-down - sustains fast switching into 5500pF MOSFET CISS with 56nF CPO capacitor |
| VCC Supply | Internally regulated 5V (4.5–5.5V) from VIN; requires external 2.9–6V supply only if both VIN < 2.9V |
| Operating Temperature | 0°C to 70°C ambient - validated for commercial-grade telecom and industrial embedded systems |
| Package | 16-pin DFN (4mm × 3mm) with exposed pad - thermal resistance θJA = 43°C/W for efficient 0.3W MOSFET loss dissipation |
Pinout & Package
Package: 16-lead plastic DFN (4mm × 3mm), exposed pad (Pin 17), RoHS-compliant, JEDEC MO-229 variant DE package. Exposed pad may be left unconnected or tied to PCB ground for improved thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1 / EN2 | Enable input comparator | Drives MOSFET off when >600mV; 8mV hysteresis prevents chatter during slow-rising control signals |
| GATE1 / GATE2 | N-channel MOSFET gate driver | ±1.4A peak drive with internal 12V-above-VIN clamp - eliminates need for external level shifters |
| CPO1 / CPO2 | Charge pump output | Connects to VIN via 56nF capacitor; stores energy for fast gate pull-up during switchover events |
| OUT1 / OUT2 | Load-side voltage sense | Feedback node for servo amplifier - must connect directly to load side of MOSFET to avoid trace IR errors |
| ONST1 / ONST2 | MOSFET conduction status output | Open-drain output pulled low when ΔVGATE > 0.7V - drives LEDs or microcontroller GPIO without external pull-up |
| VIN1 / VIN2 | Supply-side voltage sense & power source | Dual independent inputs; highest VIN powers internal 5V LDO - enables automatic primary supply selection |
| VCC | Internal regulator output / external bias input | Provides 5V ±0.5V for internal circuitry; accepts 2.9–6V external supply when both VIN < 2.9V |
| GND | Device ground reference | Common return for all analog and digital functions; connects to exposed pad for thermal path |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ideal diode control | Enables simultaneous ORing of two disparate supplies (e.g., 12V main + 3.3V auxiliary) without cross-conduction |
| Sub-microsecond switchover | 1µs gate response maintains VOUT droop <50mV during 8A load transfer - critical for SSD backup capacitor charging |
| Integrated charge pump | 3MHz internal oscillator charges CPO capacitors to sustain 1.4A gate drive without external boost circuitry |
| Fail-safe reverse-current blocking | Detects input short-circuit within 1µs and pulls gate low - limits reverse transients to <100ns duration |
| On-status monitoring outputs | ONST pins sink 1mA at 0.4V - directly interface with logic-level indicators or microcontroller interrupt inputs |
Applications
| Redundant Telecom Power Supplies | Server Supply Holdup |
|---|---|
|
Use Scenario: Dual 12V hot-swap power modules feeding backplane in MicroTCA carrier. IC Role / Device Role / Timing Role: Ideal diode controller ensuring seamless switchover between modules during insertion/removal without bus collapse. Use Value: Eliminates 0.3–0.5V Schottky drop, reducing heat sink size by 40% and enabling 10A/channel in 4mm × 3mm footprint. |
Use Scenario: 12V system maintaining DRAM refresh during AC brownout using 3F supercapacitor reservoir. IC Role / Device Role / Timing Role: Controls holdup MOSFETs to isolate failing supply while sustaining load voltage via capacitor discharge. Use Value: Maintains VOUT >11.5V for 100ms at 8A load - meets JEDEC JESD22-A114 reliability standard for data retention. |
| Plug-in Card ORing | Industrial PLC Redundancy |
|
Use Scenario: 12V/3.3V dual-input plug-in card drawing power from backplane and local DC-DC converter. IC Role / Device Role / Timing Role: Enables priority-based ORing where 12V dominates unless absent, then 3.3V takes over. Use Value: Prevents backfeeding between isolated domains; EN1/EN2 allow firmware-controlled supply sequencing. |
Use Scenario: Programmable logic controller with dual 24V DC inputs for failover in factory automation. IC Role / Device Role / Timing Role: Replaces discrete diode+MOSFET circuits to achieve <20mV forward drop at full 10A load. Use Value: Reduces power loss by 92% vs. Schottky diodes (0.4W vs. 5W), enabling fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ideal diode controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC4352CMS#PBF | 12-pin MSOP; single-supply UV/OV monitoring; no CPO charge pump - slower 5µs turn-on | Best for cost-sensitive 0–18V ORing where <1µs response not required; lacks holdup capability | Select when board space allows larger MSOP and system tolerates longer switchover time |
| LTC4370IDE#TRPBF | 16-pin DFN; adds current-sharing control between supplies; 2.5V–18V range; 1.5µs turn-on | Required for active current balancing in parallel supplies - e.g., dual 48V telecom rectifiers | Choose when load current must be evenly split between inputs to prevent thermal imbalance |
Compared with LTC4352CMS#PBF, the LTC4353CDE#TRPBF delivers 5× faster switchover and integrated charge pump for holdup; versus LTC4370IDE#TRPBF, it omits current sharing but offers tighter VFR regulation (2mV vs. 10mV) for ultra-low-drop applications.
Availability
LTC4353CDE#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, server power redundancy, and industrial PLC designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC4353CDE#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 portfolio. Linear pioneered high-performance power management ICs with focus on efficiency, reliability, and integration.
The LTC4353 belongs to Linear's PowerPath™ ideal diode controller family, designed specifically for high-availability systems requiring zero-maintenance ORing, supply holdup, and fault-tolerant power architecture in telecom, data center, and industrial environments.
FAQ
What is the minimum input voltage required for autonomous operation of the LTC4353CDE#TRPBF?
The LTC4353CDE#TRPBF operates autonomously when at least one VIN input is ≥2.9V, as its internal LDO generates the required 5V VCC supply. If both VIN inputs fall below 2.9V, an external 2.9–6V supply must be applied to the VCC pin - confirmed in the Absolute Maximum Ratings table and Functional Diagram section of the datasheet.
Can the LTC4353CDE#TRPBF drive logic-level MOSFETs with gate thresholds below 2.5V?
Yes, the LTC4353CDE#TRPBF supports logic-level MOSFETs: its GATE outputs swing up to 12V above VIN (clamped), providing sufficient overdrive for 2.5V-threshold devices even at low VIN. The Si4126DY (20V VGS(MAX), 2.8mΩ RDS(ON)) is explicitly validated in the datasheet Design Example for 12V and 3.3V applications.
How does the LTC4353CDE#TRPBF prevent reverse current during input supply failure?
The LTC4353CDE#TRPBF detects reverse current by monitoring forward voltage polarity (VIN – OUT). When this value drops below −0.3V, its servo amplifier triggers 1µs gate turn-off, pulling GATE to VIN via 1.4A internal sink - limiting reverse transient duration to <100ns and peak current to <1A, as verified in Figure 4353 G11 waveform analysis.
Is the exposed pad on the LTC4353CDE#TRPBF package electrically connected or thermal-only?
The exposed pad (Pin 17) on the LTC4353CDE#TRPBF DFN package is electrically connected to GND and serves both thermal and electrical functions. The datasheet states "Exposed Pad (PIN 17) PCB GND CONNECTION OPTIONAL" but recommends grounding it to reduce θJA from 43°C/W to ≤30°C/W and improve noise immunity in high-current paths.
What is the recommended CPO capacitor value for the Si4126DY MOSFET used with LTC4353CDE#TRPBF?
The datasheet specifies 56nF for CPO1/CPO2 when paired with the Si4126DY, based on its 5500pF input capacitance (CISS) and the 10× rule. This value balances fast gate charge delivery against CPO voltage droop during 1.4A pull-up events - validated in Typical Application TA01a and Design Example on page 10.
LTC4353CDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFDFN Exposed Pad
- 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-DFN (4x3)
LTC4353CDE#TRPBF FAQ
1.How can I place an order for LTC4353CDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC4353CDE#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 LTC4353CDE#TRPBF reliable?
The price and inventory of LTC4353CDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC4353CDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC4353CDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC4353CDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC4353CDE#TRPBF?
LTC4353CDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC4353CDE#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 LTC4353CDE#TRPBF?
For technical support, including LTC4353CDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC4353CDE#TRPBF requirements.
6.How does Aetrix verify that LTC4353CDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC4353CDE#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 LTC4353CDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC4353CDE#TRPBF?
All LTC4353CDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC4353CDE#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 LTC4353CDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC4353CDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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