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Analog Devices Inc. LTC3311JV-0.85#TRMPBF
- Part No.:
- LTC3311JV-0.85#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV-0.85#TRMPBF.pdf
- Description:
- IC REG BUCK 0.85V 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
LTC3311JV-0.85#TRMPBF from Analog Devices is a monolithic, Silent Switcher® synchronous 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 over temperature and load, and 35ns minimum on-time. It targets FPGA, ASIC, and µP core power supplies requiring low-noise, high-efficiency regulation in space-constrained automotive and industrial systems.
For engineers reviewing the LTC3311JV-0.85#TRMPBF datasheet, LTC3311JV-0.85#TRMPBF pinout, LTC3311JV-0.85#TRMPBF application, or LTC3311JV-0.85#TRMPBF equivalent, key selection criteria include its 0.85V fixed output with active voltage positioning (2.0 mV/A), 5MHz programmable switching frequency, thermal shutdown with die temperature monitor, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3311JV-0.85#TRMPBF employs constant-frequency peak current mode control with a 500mV internal reference and supports both forced continuous and pulse-skipping operation via MODE/SYNC pin configuration. Its Silent Switcher 1 architecture minimizes EMI through symmetrical layout and integrated bypass capacitors, enabling CISPR Class 5 compliance without external filters.
It integrates NMOS (4.5mΩ) and PMOS (16mΩ) power switches, features 100% duty cycle dropout operation, and includes comprehensive protection: output overvoltage (105–115% VOUT), PGOOD with 125µs delay, short-circuit recovery via SSTT-triggered soft-start, and valley current limiting (12–16A) to prevent inductor saturation during overload.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 0.85V with ±1% accuracy over –40°C to +150°C junction temperature; enables precise core rail regulation for advanced processors. |
| Output Current | Up to 12.5A continuous; supports high-performance FPGA/ASIC core domains 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 (e.g., 100nH at 2MHz) and transient response bandwidth. |
| Power Loss Components | 4.5mΩ bottom switch RDS(ON) and 16mΩ top switch RDS(ON); reduces conduction loss at high load, critical for >90% efficiency at 12A. |
| Active Voltage Positioning | 2.0 mV/A load-line slope; lowers output under full load to counteract IR drop and improve transient droop margin. |
| Minimum On-Time | 35ns typical; enables high step-down ratios (e.g., 5V→0.85V at 2MHz) without pulse skipping at light loads. |
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 control with precision threshold | 400mV rising threshold with 60mV hysteresis; enables accurate power sequencing and brown-out protection. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for feedback divider; rejects up to ±100mV PCB ground offset for ±1% VOUT accuracy. |
| 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 plus exposed pad form primary thermal and current return path; requires large copper area and multiple vias. |
| SW (6–9) | Switch node output | Four paralleled SW pins drive external inductor; minimize trace inductance to suppress ringing and EMI. |
| MODE/SYNC (13) | Multi-phase sync and mode select | Configures pulse-skipping vs. forced continuous mode; accepts external clock (0.5–2.25MHz) or outputs synchronized clock. |
| PGOOD (14) | Power good open-drain signal | Asserts high when VOUT is within 97–99% of nominal; 125µs delay filters transients; supports wired-OR for multi-phase systems. |
| RT (15) | Oscillator frequency set | Resistor-to-AGND sets fSW from 0.5–5MHz; also configures phase offset in multi-phase parallel operation. |
| SSTT (16) | Soft-start, tracking, temp monitor | 10µA current source for soft-start capacitor; tracks FB during startup; settles to ~4mV/°C for die temperature monitoring. |
| ITH (17) | Current limit and loop compensation | Compensation node for error amplifier; external RC network sets loop stability and transient response bandwidth. |
| VOUT (18) | Fixed-output voltage sense | Internally connected to factory-trimmed resistive divider; eliminates external FB resistor network required by adjustable variants. |
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 added filtering components. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive applications across –40°C to +150°C junction range; includes enhanced reliability testing and traceable manufacturing. |
| Active Voltage Positioning (AVP) | 2.0 mV/A load-line slope automatically lowers VOUT under load to pre-bias output caps and minimize undershoot during load steps. |
| Robust Short-Circuit Recovery | SSTT pin pulls low on PGOOD fault, triggering controlled soft-start restart-prevents latch-up and enables autonomous recovery after output shorts. |
| Thermally Enhanced LQFN | 3mm × 3mm footprint with exposed PGND pad achieves θJCbottom = 9°C/W, enabling 12.5A operation without external heatsink in 1-layer PCB designs. |
Applications
| FPGA Core Power Supply | Automotive ADAS Processor Rail |
|---|---|
Use Scenario: Powers 7nm/5nm FPGA core logic operating at 0.85V/12A with tight voltage tolerance and fast load transients. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing regulated core voltage with AVP and PGOOD sequencing. Use Value: 35ns minimum on-time and 5MHz switching enable compact 100nH inductor; AVP reduces required bulk capacitance by 30% versus fixed-VOUT solutions. |
Use Scenario: Supplies vision processor SoC in automotive camera module requiring AEC-Q100 compliance and EMI robustness near RF antennas. IC Role / Device Role / Timing Role: Safety-critical core rail regulator with thermal monitoring, short-circuit protection, and CISPR 25 Class 5 emissions compliance. Use Value: Silent Switcher architecture eliminates need for EMI filter components, saving 12mm² PCB area; die temperature monitor enables real-time thermal derating. |
| Industrial PLC I/O Module | 5G Baseband ASIC Supply |
Use Scenario: Delivers stable 0.85V to industrial-grade microcontroller in harsh environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with 150°C junction rating and remote sensing for long PCB traces. Use Value: AGND Kelvin sense and ±1% VOUT accuracy maintain regulation despite 80mV ground offset; thermal shutdown prevents field failures. |
Use Scenario: Powers 5G NR baseband ASIC with dynamic current bursts up to 12.5A and strict <100mV transient droop requirement. IC Role / Device Role / Timing Role: High-bandwidth POL converter using forced continuous mode and 2MHz switching for sub-1µs response. Use Value: Peak current mode control + 500kHz error amp gain bandwidth achieves <500ns load-step response; PGOOD enables system-level fault logging. |
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-0.85#TRMPBF | Same electrical specs but rated for –40°C to +150°C with H-grade screening; higher test coverage and extended burn-in. | Required for mission-critical automotive safety systems (ASIL-B/C) where H-grade reliability data is mandated. | Select when full AEC-Q100 H-grade qualification and extended reliability reports are contractually required. |
| LTC3311S-0.85#TRMPBF | Includes spread-spectrum frequency modulation (SSFM); identical pinout and AVP, but adds ±10% fSW dithering. | Better suited for ultra-low EMI environments (e.g., medical imaging, radar) where peak EMI reduction is prioritized over efficiency. | Choose when CISPR 25 Class 5 peak limits cannot be met with standard Silent Switcher layout alone. |
Compared with LTC3311HV-0.85#TRMPBF, the J-grade offers cost-optimized AEC-Q100 compliance for non-safety automotive modules; versus LTC3311S-0.85#TRMPBF, the base variant delivers 0.3% higher full-load efficiency due to absence of SSFM losses.
Availability
LTC3311JV-0.85#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability and automotive-grade traceability.
Supply support for LTC3311JV-0.85#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 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 regulation in space-constrained systems, emphasizing EMI reduction, thermal efficiency, and automotive reliability-exemplified by the LTC3311JV-0.85#TRMPBF's AEC-Q100 Grade 1 qualification and Silent Switcher architecture.
FAQ
What is the output voltage tolerance of the LTC3311JV-0.85#TRMPBF over temperature and load?
The LTC3311JV-0.85#TRMPBF guarantees ±1% output voltage accuracy over the full –40°C to +150°C junction temperature range and 0A to 12.5A load current. At 12.5A, measured VOUT is 827.4mV to 845.4mV (–2.65% to +0.65% of 0.85V), including line and load regulation effects per datasheet Table 1.
Does the LTC3311JV-0.85#TRMPBF require external feedback resistors?
No. The LTC3311JV-0.85#TRMPBF integrates factory-trimmed resistive feedback circuitry connecting Pin 18 (VOUT) to the internal 500mV reference, eliminating external resistors. This contrasts with the adjustable LTC3311, which uses Pin 18 as FB and requires an external RA/RB divider.
How does the Active Voltage Positioning (AVP) function in the LTC3311JV-0.85#TRMPBF?
The LTC3311JV-0.85#TRMPBF implements AVP with a fixed 2.0 mV/A load-line slope: output voltage decreases linearly with increasing load current. At 12.5A, VOUT drops ~25mV below nominal (to ~825mV), improving transient response by pre-biasing output capacitors and reducing required capacitance.
What thermal performance can be expected from the LTC3311JV-0.85#TRMPBF in a 2-layer PCB?
With the exposed PGND pad soldered to a 25mm² internal ground plane using 6× 0.3mm vias, the LTC3311JV-0.85#TRMPBF achieves θJA ≈ 42°C/W. At 12.5A and 3.3V input, typical power dissipation is 1.1W, resulting in ~46°C rise above ambient-well within the 150°C max junction limit.
Can the LTC3311JV-0.85#TRMPBF synchronize to an external clock, and what is the supported frequency range?
Yes. The MODE/SYNC pin accepts external square-wave clocks from 0.5MHz to 2.25MHz for synchronization. During sync, the device operates in forced continuous mode, and slope compensation adapts automatically. External clock removal is detected within 20µs, after which the oscillator returns to its default frequency.
LTC3311JV-0.85#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):
- 0.85V
- 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#TRMPBF FAQ
1.How can I place an order for LTC3311JV-0.85#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV-0.85#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-0.85#TRMPBF reliable?
The price and inventory of LTC3311JV-0.85#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-0.85#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV-0.85#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV-0.85#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV-0.85#TRMPBF?
LTC3311JV-0.85#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV-0.85#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-0.85#TRMPBF?
For technical support, including LTC3311JV-0.85#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV-0.85#TRMPBF requirements.
6.How does Aetrix verify that LTC3311JV-0.85#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV-0.85#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-0.85#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV-0.85#TRMPBF?
All LTC3311JV-0.85#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV-0.85#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-0.85#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3311JV-0.85#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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