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Analog Devices Inc. LTC3311JV-0.75#PBF
- Part No.:
- LTC3311JV-0.75#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.75#PBF.pdf
- Description:
- IC REG BUCK 0.75V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:624
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Product details
Overview
LTC3311JV-0.75#PBF 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 35ns minimum on-time. It operates in forced continuous or pulse-skipping mode and targets high-current FPGA, ASIC, and µP core supplies.
For engineers reviewing the LTC3311JV-0.75#PBF datasheet, LTC3311JV-0.75#PBF pinout, LTC3311JV-0.75#PBF application, or LTC3311JV-0.75#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 3mm × 3mm LQFN thermal performance, 0.75V active voltage positioning (1.6 mV/A), and compatibility with multi-phase parallel configurations for higher power systems.
Technical Context
The LTC3311JV-0.75#PBF employs constant-frequency peak current mode control with a 500mV internal reference scaled to 0.75V via factory-trimmed internal resistors. Its Silent Switcher 1 architecture minimizes EMI through balanced SW node layout and integrated input capacitors, enabling CISPR Class 5 compliance without external filters.
It supports clock synchronization via MODE/SYNC pin, programmable switching frequency from 0.5MHz to 5MHz using RT resistor, and dual-mode operation (pulse-skipping or forced continuous). Thermal protection includes die temperature monitoring via SSTT pin and automatic shutdown above 150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 0.75V with ±1% accuracy over –40°C to +150°C, supporting precise core rail regulation. |
| IOUT Max | 12.5A continuous output current enables single-chip supply for high-performance processors. |
| VIN Range | 2.25V to 5.5V input range supports wide battery and intermediate bus applications including 3.3V and 5V POL systems. |
| Switch RDS(ON) | Top switch: 16mΩ PMOS; bottom switch: 4.5mΩ NMOS - enables high efficiency at full load with low conduction loss. |
| fSW Range | Programmable 0.5MHz–5MHz switching frequency allows optimization of inductor size vs. efficiency trade-off. |
| Min On-Time | 35ns minimum on-time supports high step-down ratios (e.g., 5V→0.75V) at high frequencies without pulse skipping. |
| AVP Coefficient | 1.6 mV/A active voltage positioning improves transient response by pre-biasing output voltage based on load current. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJA = 42°C/W, thermally enhanced for high-current operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable input with precision threshold | 400mV rising threshold with 60mV hysteresis; 1μA shutdown current enables ultra-low-power system control. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for feedback divider; compensates for up to ±100mV PCB ground offset at load. |
| VIN (3,4,11,12) | Main input power supply | Four parallel pins reduce trace resistance and inductance; must be shorted and bypassed locally to PGND. |
| PGND (5,10,19) | Power ground return path | Three dedicated pins plus exposed pad form primary thermal and current return path; requires large copper pour and multiple vias. |
| SW (6–9) | Switch node output | Four paralleled SW pins drive external inductor; low-inductance routing critical for EMI and efficiency. |
| MODE/SYNC (13) | Multi-phase sync & mode control | Configures pulse-skipping/forced continuous mode or accepts/synchronizes external clock up to 2.25MHz. |
| PGOOD (14) | Open-drain power-good indicator | Asserts when VOUT is within 97–99% of nominal; 125μs delay filters transient excursions. |
| RT (15) | Oscillator frequency programming | Resistor-to-AGND sets fSW; 274kΩ yields ~2MHz default frequency per datasheet. |
| SSTT (16) | Soft-start, tracking, temp monitor | 10μA internal current charges external cap for controlled ramp; transitions to 4mV/°C temp sensing post-startup. |
| ITH (17) | Loop compensation node | Connects external RC network to AGND for stability tuning; directly controls peak inductor current limit. |
| VOUT (18) | Output voltage sense (LTC3311-X variant) | Internal connection to factory-set 0.75V divider; eliminates external FB resistors and improves accuracy vs. adjustable versions. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated balanced SW node layout and input capacitor placement reduces radiated EMI to meet CISPR 25 Class 5 limits without shielding. |
| 100% Duty Cycle Operation | Enables dropout operation down to VIN ≈ VOUT, maintaining regulation even as input sags near 0.75V under load. |
| Active Voltage Positioning (AVP) | 1.6 mV/A load-line slope dynamically adjusts VOUT to improve transient response and reduce required bulk capacitance. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade J: –40°C to +150°C junction), supporting infotainment, ADAS, and body control modules. |
| Thermally Enhanced LQFN | 3mm × 3mm footprint with exposed PGND pad achieves θJC(bottom) = 9°C/W, enabling 12.5A operation without heatsink in typical layouts. |
Applications
| FPGA Core Supply | Automotive Infotainment SoC |
|---|---|
Use Scenario: Powering Xilinx or Intel FPGA core rails requiring tight voltage tolerance and fast load-step response during logic reconfiguration. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 0.75V @ ≤12.5A with AVP and 35ns min-on-time for high-frequency transient suppression. Use Value: Eliminates need for external AVP circuitry; ±1% accuracy ensures reliable logic operation across temperature and load; Silent Switcher reduces EMI filtering cost. | Use Scenario: Supplying application processor cores (e.g., NXP i.MX8, Qualcomm SA8155) in automotive head units with stringent EMC and thermal requirements. IC Role / Device Role / Timing Role: AEC-Q100-compliant POL converter operating from 3.3V or 5V bus, synchronized to system clock via MODE/SYNC pin. Use Value: Meets ISO 11452-2/2015 radiated immunity and CISPR 25 Class 5 emissions; 150°C junction rating supports under-dash mounting. |
| Server CPU VR13-Compatible Rail | Industrial PLC I/O Module |
Use Scenario: Providing auxiliary core voltage for server CPUs or AI accelerators where space-constrained 3mm × 3mm footprint is critical. IC Role / Device Role / Timing Role: High-density step-down regulator supporting multi-phase parallel configuration via MODE/SYNC and PGOOD sharing. Use Value: Pin-compatible with LTC3310/LTC3310S enables drop-in upgrade; 5MHz max fSW allows use of <100nH inductors for ultra-compact designs. | Use Scenario: Powering isolated microcontroller and sensor interface circuits in industrial control cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust 12.5A POL converter operating from 24V intermediate bus (via pre-regulator) with thermal shutdown and remote sense. Use Value: AGND Kelvin sensing maintains 0.75V accuracy despite PCB voltage drops; -40°C to +150°C rating ensures reliability in uncooled enclosures. |
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-0.75#PBF | Same electrical specs but rated for –40°C to +150°C with H-grade marking; identical pinout and package. | Targeted at extended-temperature industrial or aerospace applications where H-grade qualification is mandated. | Select when full H-grade documentation, test reports, or lot traceability beyond J-grade is contractually required. |
| LTC3311S-0.75#PBF | Includes spread-spectrum modulation and enhanced EMI filtering; same 0.75V output, 12.5A rating, and LQFN package. | Better suited for ultra-low EMI environments (e.g., medical imaging, radar) where peak CISPR emissions must be minimized. | Choose when radiated EMI margin is insufficient with standard LTC3311JV-0.75#PBF, especially without external filter components. |
Compared with LTC3311HV-0.75#PBF, the LTC3311JV-0.75#PBF offers identical performance at lower cost for automotive and commercial applications, while LTC3311S-0.75#PBF adds spread-spectrum capability for stricter EMI-limited designs - neither is pin-compatible without layout review due to differing internal EMI architecture.
Availability
LTC3311JV-0.75#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive infotainment SoCs, and industrial PLC I/O modules requiring stable component supply, AEC-Q100 qualification, and high-current density POL conversion.
Supply support for LTC3311JV-0.75#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, 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-efficiency, low-EMI, high-current point-of-load conversion in space-constrained systems - specifically targeting next-generation processors, FPGAs, and automotive domain controllers demanding precision regulation and thermal resilience.
FAQ
What is the output voltage tolerance of the LTC3311JV-0.75#PBF over temperature and load?
The LTC3311JV-0.75#PBF guarantees ±1% output voltage accuracy over –40°C to +150°C junction temperature with remote sensing. At 12.5A load, measured VOUT is 734.8mV to 750.3mV (–2.03% to +0.04%); at no load, it is 755.2mV to 770.4mV (+0.69% to +2.72%). The part uses active voltage positioning to maintain regulation across load steps.
Does the LTC3311JV-0.75#PBF require external feedback resistors?
No. The LTC3311JV-0.75#PBF is an LTC3311-X variant with factory-trimmed internal resistors setting VOUT to 0.75V. Pin 18 is labeled VOUT (not FB), eliminating external resistor networks and improving accuracy versus adjustable versions like the LTC3311.
How does the Silent Switcher architecture in the LTC3311JV-0.75#PBF reduce EMI?
The LTC3311JV-0.75#PBF implements Silent Switcher 1 via symmetrical, opposing SW node copper pours and integrated input capacitors that cancel magnetic fields. This reduces peak radiated emissions by >20dB compared to conventional buck converters, enabling CISPR 25 Class 5 compliance without ferrite beads or metal shields.
Can the LTC3311JV-0.75#PBF be synchronized to an external clock?
Yes. The MODE/SYNC pin on the LTC3311JV-0.75#PBF accepts an external square wave (0.5MHz–2.25MHz) to synchronize switching frequency and phase. During sync, the device operates in forced continuous mode, and slope compensation automatically adapts to the incoming clock frequency.
What thermal management features does the LTC3311JV-0.75#PBF include?
The LTC3311JV-0.75#PBF integrates die temperature monitoring via the SSTT pin (4mV/°C), thermal shutdown above 150°C junction temperature, and a thermally enhanced 3mm × 3mm LQFN package with θJC(bottom) = 9°C/W. The exposed PGND pad (Pin 19) must be soldered to a large PCB ground plane with ≥6 thermal vias for optimal heat dissipation.
LTC3311JV-0.75#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 18-TFQFN Exposed Pad
- Packaging:
- Tray
- 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#PBF FAQ
1.How can I place an order for LTC3311JV-0.75#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.75#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 LTC3311JV-0.75#PBF reliable?
The price and inventory of LTC3311JV-0.75#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.75#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.75#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.75#PBF?
LTC3311JV-0.75#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.75#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 LTC3311JV-0.75#PBF?
For technical support, including LTC3311JV-0.75#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.75#PBF requirements.
6.How does Aetrix verify that LTC3311JV-0.75#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.75#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 LTC3311JV-0.75#PBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.75#PBF?
All LTC3311JV-0.75#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.75#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 LTC3311JV-0.75#PBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.75#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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