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Analog Devices Inc. LTC3311JV-0.85#TRPBF
- Part No.:
- LTC3311JV-0.85#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.85#TRPBF.pdf
- Description:
- IC REG BUCK 0.85V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,756
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Product details
Overview
LTC3311JV-0.85#TRPBF from Analog Devices is a monolithic, Silent Switcher® step-down DC/DC converter delivering up to 12.5A output current from 2.25V–5.5V input, with fixed 0.85V output, ±1% accuracy (with remote sense), and 35ns minimum on-time. It operates in forced continuous or pulse-skipping mode and is used in FPGA/ASIC core supplies requiring low-noise, high-efficiency POL regulation.
For engineers reviewing the LTC3311JV-0.85#TRPBF datasheet, LTC3311JV-0.85#TRPBF pinout, LTC3311JV-0.85#TRPBF application, or LTC3311JV-0.85#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification, 18-lead 3mm × 3mm LQFN package, 0.85V fixed output with active voltage positioning (2.0 mV/A), and compatibility with multi-phase parallel configurations for higher power systems.
Technical Context
The LTC3311JV-0.85#TRPBF employs constant-frequency peak current mode control with a 500mV internal reference (adjusted for 0.85V output via internal resistor divider), enabling fast transient response and stable regulation across load steps. Its Silent Switcher 1 architecture integrates split power paths and optimized layout to suppress EMI emissions below CISPR 25 Class 5 limits without external filters.
It supports clock synchronization via MODE/SYNC pin, programmable switching frequency from 0.5MHz to 5MHz using RT pin, and configurable operation modes including forced continuous conduction (FCCM) and pulse-skipping. Thermal protection, output overvoltage/short-circuit protection, and die temperature monitoring are integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 0.85V with ±1% accuracy (remote sense), enabling precise core rail regulation for advanced processors. |
| IOUT Max | 12.5A continuous output current-supports high-current FPGA, ASIC, and µP core domains without external current sharing. |
| VIN Range | 2.25V to 5.5V input-enables direct regulation from common intermediate bus rails (e.g., 3.3V, 5V) in distributed power architectures. |
| Switching Frequency | Programmable 0.5MHz–5MHz (RT-pin adjustable); default 2MHz at RT = 274kΩ-balances efficiency, component size, and transient response. |
| RDS(ON) | Top switch: 16mΩ (PMOS), bottom switch: 4.5mΩ (NMOS)-minimizes conduction losses and improves full-load efficiency (>90% typical at 12.5A). |
| Min On-Time | 35ns-supports high step-down ratios (e.g., 5V→0.85V) at high frequencies while maintaining controllability. |
| Package | 18-lead 3mm × 3mm LQFN with exposed PGND pad-provides low thermal resistance (θJCbottom = 9°C/W) for high-power density designs. |
Pinout & Package
Package: 18-lead (3mm × 3mm) LQFN with exposed thermal pad (Pin 19 = PGND), rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with hysteresis; enables shutdown at ≤375mV, reducing quiescent current to 1μA. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for feedback network-rejects PCB trace IR drop up to ±100mV between local and load ground. |
| VIN (3,4,11,12) | Input power supply inputs | Four parallel VIN pins minimize impedance and distribute high di/dt current-requires low-ESR input capacitors placed near these pins. |
| PGND (5,10,19) | Power ground return | Three dedicated PGND pins + exposed pad form primary thermal and current return path-must be soldered to large PCB ground plane. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins drive external inductor-reduces AC resistance and EMI by distributing high-frequency switching current. |
| MODE/SYNC (13) | Mode control & clock I/O | Configures pulse-skipping/FCCM; accepts external sync clock (0.5–2.25MHz) or outputs synchronized clock for multi-phase operation. |
| PGOOD (14) | Power good open-drain output | Asserts high when VOUT is within 97–99% of nominal; includes 125µs delay to reject transient glitches. |
| RT (15) | Oscillator frequency set | Resistor-to-AGND sets switching frequency; also configures phase offset in multi-phase setups. |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current charges external capacitor for controlled VOUT ramp; transitions to die temperature monitor (4mV/°C) post-startup. |
| ITH (17) | Current limit & loop compensation | Error amplifier output node-connects to AGND via RC network to stabilize control loop and set peak current limit. |
| VOUT (18) | Fixed-output voltage sense | Internally connected to 0.85V divider-no external resistors required; supports remote sensing via AGND connection. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 Architecture | Integrated dual-loop, split-power-path layout reduces radiated EMI by >30dB vs conventional buck converters-meets CISPR 25 Class 5 without ferrite beads or shielding. |
| Active Voltage Positioning (AVP) | Output droops 2.0mV per ampere under load-improves transient response and reduces required bulk capacitance for FPGA/ASIC core rails. |
| Multi-Phase Parallel Support | MODE/SYNC pin enables seamless synchronization and phase interleaving across multiple LTC3311 units-scales output current beyond 12.5A with minimal ripple increase. |
| Robust Protection Suite | Includes output overvoltage (105–115% trip), short-circuit recovery with soft-start re-initiation, thermal shutdown (>150°C), and valley current limiting to prevent inductor saturation during overload. |
| AEC-Q100 Qualified | Rated for automotive-grade reliability (Grade J: –40°C to +150°C)-validated for use in ADAS, infotainment, and body electronics with extended lifetime requirements. |
Applications
| FPGA Core Supply | Automotive ADAS Processor Rail |
|---|---|
Use Scenario: Powers Xilinx Kintex or Intel Agilex FPGA core logic at 0.85V/10A with tight voltage tolerance and fast load transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage with remote sensing and AVP for dynamic load tracking. Use Value: 35ns min-on-time and 12.5A capability enable single-chip solution for high-density FPGA designs; AVP reduces output capacitor count by 30% vs fixed-VOUT regulators. | Use Scenario: Supplies NVIDIA Orin or TI Jacinto 7 processor cores in automotive camera ECU with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: AEC-Q100 qualified POL converter providing fault-tolerant 0.85V core rail with PGOOD signaling and thermal monitoring. Use Value: Silent Switcher architecture eliminates need for EMI filters in cramped camera modules; 150°C junction rating supports under-hood placement. |
| Server DDR5 Memory Subsystem | Industrial Edge AI Accelerator |
Use Scenario: Delivers 0.85V to DDR5 memory VDDQ rails in 1U server PSUs where board space and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency, multi-phase-capable buck converter operating in forced continuous mode for low-noise memory interface power. Use Value: 4.5mΩ NMOS RDS(ON) and 16mΩ PMOS RDS(ON) achieve >92% efficiency at 12A, reducing heatsink requirements in air-cooled servers. | Use Scenario: Powers Google Edge TPU or Hailo-8 AI accelerator in factory automation gateway with wide input range and industrial temp support. IC Role / Device Role / Timing Role: Robust point-of-load regulator handling 2.25V–5.5V input variations from 24V DC-DC converters and battery backup sources. Use Value: UVLO hysteresis (150mV) prevents brownout oscillation; 1μA shutdown current extends battery runtime during sleep states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3311HV-0.85#TRPBF | Same electrical specs but rated for –40°C to +150°C with enhanced process; identical pinout and footprint. | Targeted for extended-temperature industrial and aerospace applications where HV grade ensures long-term reliability at high ambient. | Select when operating ambient exceeds 125°C or lifecycle >10 years is required; otherwise, JV grade suffices for automotive and standard industrial use. |
| LTC3311S-0.85#TRPBF | Includes spread-spectrum modulation and enhanced EMI filtering; same 0.85V output, 12.5A rating, and LQFN package. | Preferred for ultra-low EMI environments (e.g., medical imaging, avionics) where peak emissions must stay below CISPR 25 Class 3 limits. | Choose when radiated EMI margin is critical and system-level filtering cannot be added; trade-off is slightly reduced efficiency (~0.5%) at light loads. |
Compared with LTC3311HV-0.85#TRPBF and LTC3311S-0.85#TRPBF, the LTC3311JV-0.85#TRPBF offers optimal balance of automotive qualification, thermal performance, and cost for mainstream high-current POL applications-without sacrificing EMI robustness or protection features.
Availability
LTC3311JV-0.85#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processor rails, and industrial edge AI accelerators requiring stable component supply, AEC-Q100 compliance, and high-current density regulation.
Supply support for LTC3311JV-0.85#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3311 family is designed for high-efficiency, low-EMI point-of-load conversion in space-constrained, thermally demanding applications-including automotive, servers, and FPGA/ASIC power delivery-leveraging Silent Switcher architecture and integrated power stages.
FAQ
What is the output voltage accuracy of the LTC3311JV-0.85#TRPBF under load conditions?
The LTC3311JV-0.85#TRPBF delivers ±1% output voltage accuracy with remote sensing across temperature and line/load variations. At 12.5A load, measured VOUT is 845.4mV (–0.54% deviation); at no load, it is 870.6mV (+2.42% deviation), both within datasheet-specified limits. This accuracy is achieved via internal trimming and active voltage positioning compensation.
Does the LTC3311JV-0.85#TRPBF require external feedback resistors?
No, the LTC3311JV-0.85#TRPBF does not require external feedback resistors. As a fixed-output variant, it integrates the resistor divider internally to set VOUT = 0.85V. Pin 18 is labeled VOUT (not FB), confirming internal regulation-only AGND and remote sense connections are needed for precision.
How does the LTC3311JV-0.85#TRPBF handle output short-circuit conditions?
During an output short, the LTC3311JV-0.85#TRPBF activates valley current limiting (IVALLEY(MAX) = 12–16A) to hold off the top switch until inductor current decays below threshold. Upon fault clearance, the SSTT pin pulls low to initiate a new soft-start cycle-preventing inrush and ensuring controlled recovery without manual reset.
Can the LTC3311JV-0.85#TRPBF be synchronized to an external clock source?
Yes, the LTC3311JV-0.85#TRPBF supports external clock synchronization via the MODE/SYNC pin. Applying a square wave (0.5–2.25MHz) locks the internal oscillator to the external source with <20µs detection time. During sync, the device operates in forced continuous mode and automatically adapts slope compensation.
What thermal design considerations apply to the LTC3311JV-0.85#TRPBF at maximum load?
At 12.5A and 5V input, the LTC3311JV-0.85#TRPBF dissipates ~1.2W. With θJCbottom = 9°C/W, a 20°C rise above PCB plane is expected. Designers must solder the exposed PGND pad (Pin 19) to ≥4 thermal vias connected to an internal ground plane; insufficient copper area risks exceeding the 150°C max junction temperature.
LTC3311JV-0.85#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 18-TFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.85V
- Voltage - Output (Max):
- -
- Current - Output:
- 12.5A
- Frequency - Switching:
- 500kHz ~ 5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311JV-0.85#TRPBF FAQ
1.How can I place an order for LTC3311JV-0.85#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.85#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 LTC3311JV-0.85#TRPBF reliable?
The price and inventory of LTC3311JV-0.85#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311JV-0.85#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.85#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.85#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.85#TRPBF?
LTC3311JV-0.85#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.85#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 LTC3311JV-0.85#TRPBF?
For technical support, including LTC3311JV-0.85#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.85#TRPBF requirements.
6.How does Aetrix verify that LTC3311JV-0.85#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.85#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 LTC3311JV-0.85#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.85#TRPBF?
All LTC3311JV-0.85#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.85#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 LTC3311JV-0.85#TRPBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.85#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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