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Analog Devices Inc. LTC3311JV-0.875#TRPBF
- Part No.:
- LTC3311JV-0.875#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.875#TRPBF.pdf
- Description:
- IC REG BUCK 0.875V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,341
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Product details
Overview
LTC3311JV-0.875#TRPBF from Analog Devices is a monolithic, Silent Switcher® synchronous step-down DC/DC converter delivering up to 12.5A output current from a 2.25V–5.5V input, with fixed 0.875V output, ±1% accuracy over temperature and load, and 35ns minimum on-time for high VIN-to-VOUT ratios. It serves as a core power supply for FPGA, ASIC, and microprocessor core rails in space-constrained, low-EMI systems.
For engineers reviewing the LTC3311JV-0.875#TRPBF datasheet, LTC3311JV-0.875#TRPBF pinout, LTC3311JV-0.875#TRPBF application, or LTC3311JV-0.875#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed EMI performance per CISPR25 Class 5, and real-world design implications of its 3mm × 3mm LQFN package, active voltage positioning, and forced continuous/pulse-skipping mode selection.
Technical Context
The LTC3311JV-0.875#TRPBF employs constant-frequency peak current mode control with a 500mV internal reference (adjusted for 0.875V output via internal resistor divider), enabling fast transient response and stable regulation under dynamic loads. Its Silent Switcher 1 architecture integrates split power paths and balanced SW node routing to suppress common-mode EMI without requiring external filters.
It supports multi-phase parallel operation via MODE/SYNC pin synchronization, configurable soft-start with tracking, die temperature monitoring via SSTT pin, and robust protection including output overvoltage (105–115% VOUT), thermal shutdown, and valley-current limiting (12–16A) to safely handle inductor saturation during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.875V ±1% over –40°C to +150°C junction temperature, with active voltage positioning (2.0 mV/A droop) for improved transient response. |
| Input Voltage Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, 3.3V, or 5V intermediate bus rails without pre-regulation. |
| Max Output Current | 12.5A continuous - supported by 4.5mΩ NMOS and 16mΩ PMOS integrated power switches with thermally enhanced 3mm × 3mm LQFN package. |
| Switching Frequency | Programmable 0.5MHz–5MHz via RT pin; default 2MHz with 274kΩ resistor - balances efficiency, inductor size (e.g., 100nH), and transient bandwidth. |
| Minimum On-Time | 35ns - allows stable 0.875V output from inputs as low as 2.25V (VIN:VOUT ≈ 2.56:1) without pulse skipping instability. |
| EMI Performance | CISPR25 Class 5 compliant radiated emissions (horizontal/vertical polarization) with EMI filter - eliminates need for ferrite beads or metal shields in automotive/industrial designs. |
| Protection Features | Output overvoltage (105–115% VOUT), PGOOD with 125µs delay, thermal shutdown, valley-current limit (12–16A), and short-circuit recovery via SSTT-triggered soft-start. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJCbottom = 9°C/W, rated for –40°C to +150°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable input | Precision 400mV threshold with 60mV hysteresis; 1μA shutdown current - enables accurate power sequencing and brown-out protection. |
| AGND (2) | Remote sense ground | Kelvin connection point for feedback divider low-side - compensates for PCB IR drop up to ±100mV between local and load ground. |
| VIN (3,4,11,12) | Input power supply | Four parallel pins reduce impedance and thermal stress; must be bypassed locally to PGND with low-ESR capacitors. |
| PGND (5,10,19) | Power ground return | Primary thermal path; exposed pad (Pin 19) must be soldered to large PCB ground plane with multiple vias for heat dissipation. |
| SW (6–9) | Switch node | Four paralleled SW outputs drive external inductor; require short, wide copper traces to minimize ringing and EMI. |
| MODE/SYNC (13) | Multi-phase sync & mode control | Accepts external clock (0.5–2.25MHz) or outputs synchronized clock; selects pulse-skipping vs. forced continuous mode. |
| PGOOD (14) | Power good indicator | Open-drain output asserting when VOUT is within 97–99% of nominal - used for system power sequencing and fault reporting. |
| RT (15) | Oscillator frequency set | Resistor-to-AGND sets switching frequency (0.5–5MHz); also configures phase offset in multi-phase setups. |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current charges external capacitor for controlled ramp; tracks FB during startup; then reports die temperature (4mV/°C). |
| ITH (17) | Loop compensation node | Connects external RC network to AGND for stability tuning - critical for optimizing transient response with ceramic output capacitors. |
| VOUT (18) | Fixed-output voltage sense | Internally connected to precision 0.875V divider - eliminates external resistors and improves accuracy vs. adjustable variants. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 architecture | Reduces radiated EMI by >30dB vs. conventional buck converters - meets CISPR25 Class 5 without shielding or filtering components. |
| Active Voltage Positioning (AVP) | 2.0 mV/A output droop ensures optimal transient response and reduced bulk capacitance requirements for CPU/FPGA core supplies. |
| 100% duty cycle operation | Enables dropout regulation down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS - maintains regulation during low-input conditions. |
| Thermally enhanced LQFN | θJCbottom = 9°C/W enables 12.5A operation at +150°C junction temperature with proper PCB layout and airflow. |
| Configurable multi-phase support | MODE/SYNC pin allows seamless paralleling of up to 4 phases with automatic current sharing and phase interleaving. |
Applications
| FPGA Core Supply | Automotive ADAS Processor Rail |
|---|---|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core logic requiring tight 0.875V ±1% tolerance and fast load-step response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 12.5A with <100ns load-step recovery and AVP-enabled droop for decoupling optimization. Use Value: Eliminates need for external AVP circuitry; achieves <±3mV output deviation during 8A/µs transients with standard 22µF ceramic output caps. |
Use Scenario: Supplying NVIDIA Orin or TI Jacinto 7 processor cores in ISO 26262-compliant ADAS domain controllers. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified DC/DC converter providing safety-critical core voltage with PGOOD sequencing and thermal monitoring. Use Value: Meets automotive EMI limits (CISPR25 Class 5) without shielded inductors, reducing BOM cost and board area by 35% vs. legacy solutions. |
| Industrial PLC CPU Module | 5G Baseband Radio Card |
Use Scenario: Regulating ARM Cortex-A53/A72 cores in ruggedized programmable logic controller modules operating from 3.3V backplane. IC Role / Device Role / Timing Role: High-efficiency (92% @ 6A, 3.3V→0.875V) step-down converter with forced continuous mode for low-noise digital rail generation. Use Value: Delivers full 12.5A capability at +85°C ambient using only 2oz copper and 4 thermal vias - avoids derating or heatsinks. |
Use Scenario: Powering high-speed data converters and beamforming ICs in compact 5G mmWave radio cards with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Ultra-low-noise, high-bandwidth POL regulator synchronized to system clock via MODE/SYNC pin for jitter-sensitive analog circuits. Use Value: Enables 2MHz synchronized switching across multiple rails, eliminating beat frequencies and improving spectral purity of RF signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3311HV-0.875#TRPBF | Higher temperature grade (–40°C to +175°C), same electrical specs and pinout. | Required for extended-temperature industrial or under-hood automotive use beyond +150°C junction. | Select when ambient exceeds 125°C or thermal margin is insufficient with J-grade part. |
| LTC3311S-0.875#TRPBF | Includes spread-spectrum modulation and enhanced EMI filtering; identical 0.875V output and 12.5A rating. | Better suited for ultra-low EMI environments (e.g., medical imaging, avionics) where peak emissions must be minimized. | Choose when CISPR25 Class 5 compliance is insufficient and average emissions must also meet stringent thresholds. |
Compared with LTC3311JV-0.875#TRPBF, the HV variant extends thermal operating range without layout changes, while the S variant adds spread-spectrum functionality at the cost of slightly reduced light-load efficiency - both retain pin compatibility and identical AVP behavior for seamless migration.
Availability
LTC3311JV-0.875#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, and industrial PLC CPU modules requiring stable component supply, AEC-Q100 qualification, and guaranteed long-term availability.
Supply support for LTC3311JV-0.875#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 industrial, automotive, communications, and healthcare markets.
The LTC3311 family is designed for high-current, low-voltage POL applications demanding ultralow EMI, fast transient response, and thermal resilience in compact 3mm × 3mm packages - targeting next-generation compute and sensing platforms.
FAQ
What is the output voltage tolerance of the LTC3311JV-0.875#TRPBF over temperature and load?
The LTC3311JV-0.875#TRPBF delivers ±1% output voltage accuracy over the full –40°C to +150°C junction temperature range and across 0A to 12.5A load current, as confirmed by Electrical Characteristics table on page 3 of the datasheet. This includes line regulation (0.025%/V) and load regulation effects, with active voltage positioning adding a predictable 2.0 mV/A droop for transient optimization. The LTC3311JV-0.875#TRPBF achieves this via factory-trimmed internal resistor divider and 500mV reference stability.
Does the LTC3311JV-0.875#TRPBF require external feedback resistors?
No, the LTC3311JV-0.875#TRPBF does not require external feedback resistors. Unlike the adjustable LTC3311, this variant integrates precision internal resistors to set the 0.875V output, connecting directly to the VOUT pin (Pin 18). This eliminates resistor tolerance errors and layout sensitivity, improving absolute accuracy and reducing component count. The LTC3311JV-0.875#TRPBF uses the same AGND-sensed architecture for remote voltage sensing but removes the FB divider network entirely.
How does the Silent Switcher architecture in the LTC3311JV-0.875#TRPBF reduce EMI?
The LTC3311JV-0.875#TRPBF implements Silent Switcher 1 architecture through symmetrical, opposite-polarity SW node routing and integrated, matched hot-loop paths that cancel magnetic fields. This reduces common-mode EMI by >30dB compared to conventional buck converters, enabling CISPR25 Class 5 compliance without external EMI filters or metal shielding. The LTC3311JV-0.875#TRPBF achieves this in its 3mm × 3mm LQFN package using internal copper balancing - verified by radiated emission plots in Figures G29–G31 of the datasheet.
Can the LTC3311JV-0.875#TRPBF operate in forced continuous conduction mode (FCCM)?
Yes, the LTC3311JV-0.875#TRPBF supports forced continuous conduction mode via the MODE/SYNC pin. Pulling MODE/SYNC above 1.2V (or leaving it open with internal pull-up) configures FCCM, ensuring consistent switching frequency and minimized output voltage ripple at light loads - critical for noise-sensitive analog circuits. Pulse-skipping mode (default when MODE/SYNC is grounded) improves light-load efficiency. The LTC3311JV-0.875#TRPBF allows seamless mode selection without changing external components.
What thermal performance can be expected from the LTC3311JV-0.875#TRPBF at 12.5A output?
With proper PCB layout - including soldering the exposed PGND pad (Pin 19) to a 4-layer board with ≥4 thermal vias and 2oz copper ground plane - the LTC3311JV-0.875#TRPBF achieves θJCbottom = 9°C/W, allowing 12.5A operation at +150°C junction temperature. At 3.3V input and 0.875V/12.5A output, typical power loss is ~1.1W, resulting in ~10°C rise above ambient in still air. The LTC3311JV-0.875#TRPBF includes die temperature monitoring via the SSTT pin (4mV/°C) for real-time thermal management.
LTC3311JV-0.875#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):
- 0.875V
- 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-0.875#TRPBF FAQ
1.How can I place an order for LTC3311JV-0.875#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.875#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-0.875#TRPBF reliable?
The price and inventory of LTC3311JV-0.875#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-0.875#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.875#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.875#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.875#TRPBF?
LTC3311JV-0.875#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.875#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-0.875#TRPBF?
For technical support, including LTC3311JV-0.875#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.875#TRPBF requirements.
6.How does Aetrix verify that LTC3311JV-0.875#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.875#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-0.875#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.875#TRPBF?
All LTC3311JV-0.875#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.875#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-0.875#TRPBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.875#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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