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Analog Devices Inc. LTC3311JV-0.75#TRMPBF
- Part No.:
- LTC3311JV-0.75#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.75#TRMPBF.pdf
- Description:
- IC REG BUCK 0.75V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,121
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Product details
Overview
LTC3311JV-0.75#TRMPBF 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 0.75V output, ±1% accuracy (with remote sense), and 5MHz programmable switching frequency. It operates in automotive-grade junction temperature range (–40°C to +150°C) and targets FPGA, ASIC, and µP core power supplies.
For engineers reviewing the LTC3311JV-0.75#TRMPBF datasheet, LTC3311JV-0.75#TRMPBF pinout, LTC3311JV-0.75#TRMPBF application, or LTC3311JV-0.75#TRMPBF equivalent, key selection considerations include its 0.75V fixed output with active voltage positioning (1.6 mV/A load droop), 35ns minimum on-time, 4.5mΩ NMOS/16mΩ PMOS RDS(ON), and thermally enhanced 3mm × 3mm LQFN package with exposed PGND pad.
Technical Context
The LTC3311JV-0.75#TRMPBF employs constant-frequency peak current mode control with internal 500mV reference (adjusted for 0.75V output via factory-trimmed resistive divider), enabling fast transient response and stable regulation under dynamic load steps. Its Silent Switcher 1 architecture minimizes EMI through symmetrical layout and integrated bypass capacitors.
It supports forced continuous conduction mode (FCCM) and pulse-skipping mode via MODE/SYNC pin configuration, includes die temperature monitoring via SSTT pin (4mV/°C slope), and features output short-circuit protection with valley-current limiting (IVALLEY(MAX) = 12–16A) and automatic soft-start recovery after fault clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.75V ±1% (with remote sense); enables precise low-voltage core supply for advanced processors. |
| Max Output Current | 12.5A continuous; supports high-performance FPGA/ASIC core rails without external current sharing. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Switching Frequency | Programmable 0.5–5MHz via RT resistor; allows optimization of inductor size vs. efficiency (e.g., 2MHz typical with 274kΩ). |
| Power MOSFET RDS(ON) | Top switch: 16mΩ (PMOS), bottom switch: 4.5mΩ (NMOS); reduces conduction loss at high load currents. |
| Minimum On-Time | 35ns (typical); enables high step-down ratios (e.g., 5V→0.75V at 2MHz) without pulse skipping. |
| Thermal Rating | Junction temperature range –40°C to +150°C; qualified per AEC-Q100 Grade 1 for automotive under-hood use. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJA = 42°C/W, requiring soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with 60mV hysteresis; enables accurate power sequencing and shutdown at <1μA quiescent current. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for feedback network; compensates for up to ±100mV PCB ground offset between IC and load. |
| VIN (3,4,11,12) | Main input power supply | Four parallel pins reduce IR drop and inductance; must be shorted and bypassed locally to PGND with low-ESR capacitors. |
| PGND (5,10,19) | Power ground return path | Three dedicated pins + exposed pad form primary thermal and current return path; requires multiple vias to internal ground plane. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins minimize loop inductance and EMI; connect directly to inductor with wide, low-inductance traces. |
| MODE/SYNC (13) | Mode selection & clock interface | Configures pulse-skipping/FCCM operation or synchronizes to external clock (0.5–2.25MHz input range). |
| PGOOD (14) | Power-good open-drain output | Asserts high when VOUT is within ±3% of nominal (97–99%); includes 125µs delay to reject transient glitches. |
| RT (15) | Oscillator frequency programming | Connects to AGND via resistor (e.g., 274kΩ → 2MHz); also sets phase offset in multi-phase parallel configurations. |
| SSTT (16) | Soft-start, tracking & temperature monitor | 10µA internal current source for soft-start capacitor; transitions to 4mV/°C temperature readout post-startup. |
| ITH (17) | Loop compensation node | Connects external RC network to AGND; sets error amplifier transconductance (1mS) and loop stability. |
| VOUT (18) | Fixed-output voltage sense | Internally connected to factory-trimmed divider; eliminates external resistors required for adjustable versions (LTC3311). |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 architecture | Reduces radiated EMI by >30dB vs. conventional buck converters, meeting CISPR 25 Class 5 limits without shielding. |
| Active Voltage Positioning (AVP) | 1.6 mV/A output droop for LTC3311JV-0.75#TRMPBF; improves transient response and reduces required output capacitance. |
| 100% duty cycle operation | Enables ultra-low dropout (e.g., 0.75V out from 0.85V in); maintains regulation during brown-out conditions. |
| Robust protection suite | Includes output overvoltage (105–115% VOUT), thermal shutdown, output short-circuit recovery, and inductor saturation tolerance. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications across –40°C to +150°C junction temperature; supported by reliability reports. |
Applications
| FPGA Core Power Supply | Automotive ADAS Processor Rail |
|---|---|
Use Scenario: Powers 7nm/5nm FPGA core logic requiring tightly regulated 0.75V at up to 12A with sub-10mV ripple. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote sensing and AVP for dynamic load tracking. Use Value: 35ns minimum on-time enables 5V→0.75V conversion at 2MHz, reducing inductor size by 60% vs. 500kHz designs. |
Use Scenario: Supplies vision processor SoC in automotive camera module operating in under-hood environment (–40°C to +125°C ambient). IC Role / Device Role / Timing Role: AEC-Q100 qualified DC/DC converter with die temperature monitoring and robust EMI performance. Use Value: Silent Switcher architecture eliminates need for metal shielding, saving board space and cost while meeting strict automotive EMC requirements. |
| Industrial PLC CPU Core | High-Density Telecom POL |
Use Scenario: Delivers 0.75V/10A to real-time industrial controller CPU with extended temperature operation and long-term reliability. IC Role / Device Role / Timing Role: Fixed-output, high-efficiency buck converter with 150°C max junction rating and thermal shutdown. Use Value: 4.5mΩ bottom-switch RDS(ON) reduces full-load conduction loss to <500mW, minimizing heatsink requirements. |
Use Scenario: Point-of-load regulator on dense telecom line card where board area and thermal density are critical constraints. IC Role / Device Role / Timing Role: Compact 3mm × 3mm LQFN step-down converter supporting multi-phase parallel operation via MODE/SYNC. Use Value: Pin-compatible with LTC3310/LTC3310S enables scalable power design; 18-lead package fits high-density layouts without compromising thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3310SJDE#TRPBF | Adjustable output (0.5V–VIN), 10A max, same 3mm × 3mm LQFN but no AVP or SSTT temp monitor. | Lacks fixed 0.75V output and active voltage positioning; requires external feedback resistors. | Select when output voltage flexibility or lower cost outweighs need for factory-trimmed 0.75V and AVP. |
| TPS546D24RSAR | 6A max, 0.5V–2.0V adjustable, 2.5V–18V input, integrated FETs, but no Silent Switcher EMI reduction. | Higher input range but lower current capability; lacks AEC-Q100 qualification and 150°C rating. | Select for wider VIN range and digital interface (PMBus), not for automotive or ultra-low-EMI 12.5A applications. |
Compared with LTC3310SJDE#TRPBF and TPS546D24RSAR, the LTC3311JV-0.75#TRMPBF uniquely combines 12.5A capability, fixed 0.75V output with ±1% accuracy, AEC-Q100 Grade 1 qualification, and Silent Switcher EMI performance in a 3mm × 3mm footprint-making it optimal for space-constrained, high-reliability core power applications.
Availability
LTC3311JV-0.75#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS systems, and industrial PLC CPU rails requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3311JV-0.75#TRMPBF 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-noise point-of-load power delivery in space-constrained applications-including automotive ADAS, server CPUs, and FPGA/ASIC cores-leveraging Silent Switcher architecture for EMI-critical environments.
FAQ
What is the output voltage tolerance of the LTC3311JV-0.75#TRMPBF under full load?
The LTC3311JV-0.75#TRMPBF delivers 0.75V output with ±1% accuracy over temperature and line when using remote sensing. At 12.5A load, the regulated output is 743mV (min) to 750.3mV (max), reflecting a worst-case deviation of –0.93% to +0.04% from nominal. This tight tolerance is achieved via factory-trimmed internal resistive divider and 500mV reference with remote AGND sensing.
Does the LTC3311JV-0.75#TRMPBF support synchronization to an external clock?
Yes, the LTC3311JV-0.75#TRMPBF supports external clock synchronization via the MODE/SYNC pin. It accepts square-wave inputs from 0.5MHz to 2.25MHz, locks top-switch turn-on to the rising edge, and automatically adapts slope compensation. The device detects clock removal within ~20µs and smoothly reverts to its default frequency set by the RT resistor.
How does the Active Voltage Positioning (AVP) function in the LTC3311JV-0.75#TRMPBF?
The LTC3311JV-0.75#TRMPBF implements AVP with a fixed 1.6 mV/A droop coefficient: output voltage decreases linearly with increasing load current (e.g., ~19mV drop from no-load to 12.5A). This pre-empts voltage sag during load transients, improving dynamic response and reducing required output capacitance by up to 40% compared to flat-regulation designs.
What thermal management is required for the LTC3311JV-0.75#TRMPBF at 12.5A?
At 12.5A continuous, the LTC3311JV-0.75#TRMPBF requires robust PCB thermal design: the exposed PGND pad (Pin 19) must be soldered to a ≥4 cm² internal copper ground plane using ≥6 thermal vias (0.3mm diameter). With θJA = 42°C/W, 12.5A operation at 5V input yields ~1.8W dissipation, resulting in ~75°C rise above ambient-well within its –40°C to +150°C junction rating.
Is the LTC3311JV-0.75#TRMPBF pin-compatible with other members of the LTC3311 family?
Yes, the LTC3311JV-0.75#TRMPBF shares identical 18-lead 3mm × 3mm LQFN packaging and pinout with all LTC3311/LTC3311-X variants (e.g., LTC3311JV-0.85#TRMPBF, LTC3311JV#TRMPBF). This enables drop-in replacement across output voltage options without PCB redesign, though feedback network and AVP coefficients differ per variant.
LTC3311JV-0.75#TRMPBF 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):
- 0.75V
- 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-0.75#TRMPBF FAQ
1.How can I place an order for LTC3311JV-0.75#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.75#TRMPBF 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-0.75#TRMPBF reliable?
The price and inventory of LTC3311JV-0.75#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311JV-0.75#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.75#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.75#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.75#TRMPBF?
LTC3311JV-0.75#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.75#TRMPBF 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-0.75#TRMPBF?
For technical support, including LTC3311JV-0.75#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.75#TRMPBF requirements.
6.How does Aetrix verify that LTC3311JV-0.75#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.75#TRMPBF 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-0.75#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.75#TRMPBF?
All LTC3311JV-0.75#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.75#TRMPBF, 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-0.75#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.75#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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