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Analog Devices Inc. LTC3311JV#PBF
- Part No.:
- LTC3311JV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV#PBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:619
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Product details
Overview
LTC3311JV#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 500mV feedback reference, 35ns minimum on-time, and ±1% VOUT accuracy using remote sense. It operates in forced continuous or pulse-skipping mode and supports multi-phase parallel operation for high-power FPGA/ASIC core supplies.
For engineers reviewing the LTC3311JV#PBF datasheet, LTC3311JV#PBF pinout, LTC3311JV#PBF application, or LTC3311JV#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 3mm × 3mm LQFN thermal performance (θJC = 9°C/W), ultralow EMI compliance per CISPR25 Class 5, and programmable 0.5–5MHz switching frequency with external RT resistor.
Technical Context
The LTC3311JV#PBF employs constant-frequency peak current mode control with internal 500mV reference and error amplifier transconductance of 1mS. Its Silent Switcher 1 architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI without requiring external filters.
It integrates dual power switches (4.5mΩ NMOS / 16mΩ PMOS), supports 100% duty cycle dropout operation, and features configurable MODE/SYNC pin for synchronization, multiphase interleaving, or PWM mode selection-enabling precise timing coordination in distributed POL systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and intermediate bus rails in compact portable and automotive systems. |
| IOUT Max | 12.5A - delivers full rated current with thermal derating up to +150°C junction temperature in 3mm × 3mm LQFN package. |
| VFB Accuracy | ±1% with remote sense - enables accurate regulation despite PCB ground bounce up to ±100mV between local and load AGND. |
| fSW Range | 0.5MHz to 5MHz (RT-programmable) - allows optimization of inductor size (e.g., 100nH at 2MHz) vs. efficiency trade-off. |
| Min On-Time | 35ns - supports high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping or instability. |
| Thermal Rating | Junction temp range –40°C to +150°C - qualified per AEC-Q100 Grade 1 for under-hood automotive and industrial environments. |
| EMI Performance | CISPR25 Class 5 compliant - achieves radiated emissions <6dBµV/m below peak limit at 100MHz with standard demo board layout. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJA = 42°C/W, θJC = 9°C/W (bottom).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with 60mV hysteresis; 1μA shutdown current enables battery-sensitive always-on systems. |
| AGND (2) | Remote sense ground | Kelvin connection point for FB divider low-side - rejects up to ±100mV ground offset between IC and load. |
| VIN (3,4,11,12) | Main power input | Four parallel pins reduce IR drop and thermal resistance; require low-ESR ceramic input caps placed adjacent to PGND. |
| PGND (5,10,19) | Power ground return | Exposed pad (Pin 19) must be soldered to large PCB ground plane with ≥6 thermal vias for optimal θJC = 9°C/W. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins minimize loop inductance; connect directly to inductor with short, wide copper traces. |
| MODE/SYNC (13) | Multi-phase sync interface | Accepts external clock (0.5–2.25MHz) or outputs synchronized clock; configures pulse-skipping vs. forced continuous mode. |
| PGOOD (14) | Power-good open-drain | Active-low signal asserts after 125μs delay when VOUT reaches 97–99% of setpoint; supports wired-OR in multi-phase designs. |
| RT (15) | Oscillator frequency set | Resistor to AGND sets fSW; 274kΩ yields 2MHz typical - critical for loop bandwidth and EMI shaping. |
| SSTT (16) | Soft-start/track/temp monitor | 10μA internal current charges external cap for controlled ramp; transitions to die temperature monitor (4mV/°C) post-startup. |
| ITH (17) | Loop compensation node | Connect Type II/III compensation network to AGND; sets crossover frequency and phase margin for transient stability. |
| FB (18) | Feedback voltage input | Regulated to 500mV; connects to resistive divider from VOUT - determines output voltage per VOUT = 500mV × (1 + RA/RB). |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Integrated split-power-path layout and internal bypass caps reduce radiated EMI by >30dB vs. conventional buck converters - eliminates need for external EMI filters in CISPR25-compliant designs. |
| Ultralow Minimum On-Time (35ns) | Enables direct 5V-to-0.5V conversion at 2MHz without requiring external clock dithering or complex control schemes - simplifies high-ratio POL design. |
| Configurable Multi-Phase Operation | MODE/SYNC pin supports master-slave interleaving of up to 4 LTC3311JV#PBF units - scales output current to 50A while reducing input/output ripple by √N. |
| Active Voltage Positioning (AVP) | Output voltage drops linearly with load (e.g., 2.0mV/A for LTC3311-0.85) - improves transient response and reduces required bulk capacitance by 30–50%. |
| Dual Current Limit Protection | Peak switch current limit (15–21A) and valley current limit (12–16A) prevent inductor saturation during overload and short-circuit - enables safe recovery via SSTT-triggered soft-start. |
Applications
| High-Performance FPGA Core Supply | Automotive ADAS Domain Controller |
|---|---|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core rails requiring tight voltage tolerance (±1%), fast load transient response (<10µs), and low noise in space-constrained modules. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote sense, 12.5A capability, and 2MHz switching to meet FPGA dynamic current demands. Use Value: ±1% VOUT accuracy with remote sense ensures logic stability across PCB voltage drops; 35ns min on-time supports 0.8V@12A from 3.3V input without external components. | Use Scenario: Providing 1.2V core supply to NVIDIA Orin or TI Jacinto 7 SoCs in radar/vision ECUs operating in -40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified DC/DC converter with thermal shutdown, die temperature monitoring, and robust EMI suppression for safety-critical domains. Use Value: CISPR25 Class 5 compliance eliminates radiated EMI failures during EMC testing; 150°C max junction rating enables operation without derating in sealed enclosures. |
| Industrial PLC I/O Module | 5G Baseband Radio Unit (RU) |
Use Scenario: Generating isolated 3.3V/5V auxiliary rails from 12V backplane in modular PLC chassis with strict thermal and reliability requirements. IC Role / Device Role / Timing Role: High-efficiency, thermally robust POL converter with forced continuous mode for stable light-load regulation and predictable thermal behavior. Use Value: 4.5mΩ NMOS/16mΩ PMOS RDS(on) delivers >92% efficiency at 12.5A/3.3V; θJC = 9°C/W enables direct heatsink mounting on metal chassis. | Use Scenario: Delivering 1.8V @ 10A to RF transceivers in massive MIMO RU units where board space, thermal density, and spectral purity are critical. IC Role / Device Role / Timing Role: Low-noise, high-current buck converter synchronized to system clock via MODE/SYNC pin to avoid heterodyne interference in RF bands. Use Value: External clock synchronization eliminates beat frequencies in 2.4–6GHz bands; Silent Switcher architecture ensures conducted/radiated emissions remain below LTE/NR mask limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965GQ-Z | 40V max VIN, 16A rating, 500kHz–2MHz fixed-frequency PWM; no AVP or die temp monitor; requires external compensation. | Targeted at higher-input industrial motor drives, not low-VIN POL; lacks remote sense accuracy and thermal telemetry. | Select MP2965GQ-Z only if input exceeds 5.5V or higher current headroom is needed; not suitable for FPGA core rails requiring <1% accuracy. |
| LTC3310SJDE#PBF | Same 3mm × 3mm LQFN package, pin-compatible, but limited to 10A; shares Silent Switcher 2 architecture, 2.25V–5.5V VIN, and identical MODE/SYNC functionality. | Drop-in replacement for lower-current designs; identical layout and thermal footprint - simplifies BOM rationalization. | Choose LTC3310SJDE#PBF when 10A suffices and cost reduction is prioritized; retains all key features except peak current capability. |
Compared with MP2965GQ-Z and LTC3310SJDE#PBF, the LTC3311JV#PBF uniquely combines 12.5A capability, ±1% remote-sense accuracy, AEC-Q100 qualification, and integrated die temperature monitoring - making it the only option for automotive-grade, high-precision FPGA/SoC core supplies in thermally constrained layouts.
Availability
LTC3311JV#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3311JV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, communications, and automotive markets since 1965.
The LTC3311JV#PBF belongs to Analog Devices' Power by Linear™ family of ultralow-noise, high-efficiency DC/DC converters designed specifically for powering sensitive digital loads-including FPGAs, ASICs, and microprocessors-in space- and thermally-constrained applications.
FAQ
What is the maximum output current capability of the LTC3311JV#PBF?
The LTC3311JV#PBF delivers up to 12.5A continuous output current under thermal-limited conditions at +150°C junction temperature. This rating assumes proper PCB layout with the exposed PGND pad soldered to a 4-layer board with ≥6 thermal vias and adequate copper area. Derating applies above +85°C ambient; full 12.5A is achievable at 25°C ambient with 3W total power dissipation.
Does the LTC3311JV#PBF support remote voltage sensing?
Yes, the LTC3311JV#PBF supports true remote voltage sensing via the dedicated AGND pin (Pin 2), which serves as the Kelvin return for the FB resistor divider. This allows the device to regulate output voltage at the load point with ±1% accuracy despite up to ±100mV ground potential difference between the IC's local ground and the load ground - critical for high-current, low-voltage FPGA core rails.
How is the switching frequency programmed on the LTC3311JV#PBF?
The switching frequency of the LTC3311JV#PBF is programmed using an external resistor (RT) connected from Pin 15 (RT) to AGND. A 274kΩ resistor sets fSW to 2MHz typical; the full range is 0.5MHz to 5MHz. The RT pin also supports synchronization to an external clock applied to MODE/SYNC (Pin 13), enabling deterministic timing in multi-phase or noise-sensitive systems.
Is the LTC3311JV#PBF qualified for automotive applications?
Yes, the LTC3311JV#PBF is AEC-Q100 qualified for automotive applications (Grade 1: –40°C to +125°C ambient, –40°C to +150°C junction). Its datasheet specifies guaranteed operation over this extended temperature range, and it includes features essential for automotive use: die temperature monitoring (via SSTT pin), robust PGOOD fault reporting, and CISPR25 Class 5 EMI compliance - all validated per automotive reliability test standards.
What protection features does the LTC3311JV#PBF include?
The LTC3311JV#PBF integrates comprehensive protection: input UVLO (2.0V rising, 150mV hysteresis), output overvoltage protection (105–115% VOUT trip), thermal shutdown (>165°C), output short-circuit recovery via SSTT-triggered soft-start, and dual current limiting (peak: 15–21A; valley: 12–16A). All protections are fully specified over the –40°C to +150°C junction temperature range.
LTC3311JV#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 12.5A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311JV#PBF FAQ
1.How can I place an order for LTC3311JV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV#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#PBF reliable?
The price and inventory of LTC3311JV#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#PBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV#PBF?
LTC3311JV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV#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#PBF?
For technical support, including LTC3311JV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV#PBF requirements.
6.How does Aetrix verify that LTC3311JV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV#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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV#PBF?
All LTC3311JV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV#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#PBF part is unused and in its original packaging.
Return procedure for LTC3311JV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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