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Analog Devices Inc. LTC3311SEV#PBF
- Part No.:
- LTC3311SEV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311SEV#PBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:600
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Product details
Overview
LTC3311SEV#PBF from Analog Devices is a monolithic, Silent Switcher 2 synchronous step-down DC/DC converter delivering up to 12.5A output current from 2.25V–5.5V input, with 500mV reference voltage, 35ns minimum on-time, and ±1% VOUT accuracy using remote sense. It serves as a high-density POL regulator for FPGA/ASIC core supplies in space-constrained telecom and automotive systems.
For engineers reviewing the LTC3311SEV#PBF datasheet, LTC3311SEV#PBF pinout, LTC3311SEV#PBF application, or LTC3311SEV#PBF equivalent, key selection criteria include its AEC-Q100 qualification, 3mm × 3mm LQFN thermal performance, 5MHz programmable switching frequency, and integrated power good and die temperature monitoring functions.
Technical Context
The LTC3311SEV#PBF employs constant-frequency peak current mode control with internal hot-loop bypass capacitors to achieve ultralow EMI emissions and high efficiency at up to 5MHz switching. Its Silent Switcher 2 architecture minimizes PCB layout sensitivity while maintaining fast transient response via 35ns minimum on-time and 500mV precision reference.
It supports forced continuous or pulse-skip operation via MODE/SYNC pin configuration, enables multi-phase paralleling for higher power, and integrates comprehensive protection including output overvoltage, short-circuit recovery with soft-start reinitiation, thermal shutdown, and valley current limiting (12–16A) alongside peak current limit (15–21A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, 3.3V/5V intermediate bus, and low-dropout operation down to 2.25V input |
| VOUT Range | 0.5V to VIN - enables sub-1V core supplies for modern processors with 500mV feedback reference |
| Output Current | Up to 12.5A - sustained delivery enabled by thermally enhanced 3mm × 3mm LQFN package with exposed PGND pad |
| Switching Frequency | Programmable 0.5MHz–5MHz via RT resistor - allows optimization of inductor size vs. efficiency trade-off |
| Accuracy | ±1% VOUT with remote sense - maintains tight regulation despite PCB ground offsets up to ±100mV |
| Efficiency | Peak >90% at 12A (VIN=3.3V, VOUT=1.2V, fSW=2MHz) - enabled by 4.5mΩ NMOS and 16mΩ PMOS integrated FETs |
| EMI Performance | CISPR 25 Class 5 compliant - achieved via Silent Switcher 2 architecture without external EMI filters in typical layouts |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJCbottom = 9°C/W, rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with hysteresis; direct connection to VIN enables device; <1µA shutdown current |
| AGND (2) | Remote sense ground | Kelvin connection point for FB divider low-side; compensates for PCB ground offset up to ±100mV |
| VIN (3,4,11,12) | Main power input | Four parallel pins reduce IR drop and improve thermal conduction; require local ceramic bypass to PGND |
| PGND (5,10,19) | Power ground return | Three dedicated pins + exposed pad form primary thermal path; must be soldered to large PCB ground plane |
| SW (6–9) | Switch node outputs | Four parallel SW pins minimize loop inductance; connect directly to inductor with short, wide copper |
| MODE/SYNC (13) | Frequency control interface | Configures PWM mode (pulse-skip/forced continuous) or synchronizes to external clock (0.5–2.25MHz) |
| PGOOD (14) | Power status indicator | Open-drain output asserts low when VOUT deviates >3% from setpoint; includes 125µs delay to reject transients |
| RT (15) | Oscillator programming | Resistor-to-AGND sets switching frequency (e.g., 274kΩ → 2MHz); also used for multiphase phasing |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current charges external capacitor for controlled ramp; transitions to die temperature monitor (4mV/°C) post-startup |
| ITH (17) | Loop compensation node | Connects external RC network to AGND for stability tuning; error amplifier output controls peak switch current |
| FB (18) | Feedback input | Regulated to 500mV ±5mV; connects to resistive divider from VOUT; supports phase-lead capacitor for bandwidth optimization |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN bypass capacitors and symmetrical hot-loop layout reduce radiated EMI to CISPR 25 Class 5 levels without shielding |
| 100% duty cycle operation | Enables dropout operation down to (VOUT + ILOAD × RDS(ON)_PMOS + ILOAD × DCR_inductor) with no loss of regulation |
| Thermal enhancement | Exposed PGND pad and θJCbottom = 9°C/W enable 12.5A operation in 3mm × 3mm footprint at 125°C ambient |
| AEC-Q100 qualification | Qualified for automotive applications (Grade 1: –40°C to +125°C), supporting infotainment and ADAS power rails |
| Multi-phase paralleling support | Configurable forced continuous mode and MODE/SYNC phasing allow seamless scaling to >25A with matched current sharing |
Applications
| FPGA Core Supply | Automotive Infotainment SoC |
|---|---|
Use Scenario: Powering 0.8V/10A core rail of Xilinx Kria KV260 or Intel Agilex FPGA in edge AI gateway. IC Role / Device Role / Timing Role: Primary POL regulator with remote sense, providing tightly regulated low-noise supply synchronized to system clock via MODE/SYNC. Use Value: ±1% accuracy and 35ns min-on-time ensure stable core voltage during dynamic DVFS transitions; Silent Switcher 2 meets automotive EMI limits without added filter components. |
Use Scenario: Generating 1.1V/8A supply for NXP S32G2 vehicle networking processor in domain controller. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck converter with PGOOD signaling and die temperature monitoring for functional safety compliance. Use Value: –40°C to +125°C operation and integrated OVP/short-circuit protection eliminate need for external supervision ICs in harsh under-hood environments. |
| 5G Baseband ASIC Supply | Industrial PLC CPU Rail |
Use Scenario: Delivering 0.95V/12A to Qualcomm QDM5675 mmWave baseband ASIC in active antenna unit. IC Role / Device Role / Timing Role: High-current, high-frequency (3MHz) POL regulator with programmable frequency to avoid RF interference bands. Use Value: 5MHz max switching enables <1µH inductor size, reducing solution volume by 40% vs. 1MHz alternatives while maintaining >88% efficiency at full load. |
Use Scenario: Providing 1.8V/6A supply to ARM Cortex-A72 CPU in DIN-rail mounted industrial controller with extended temperature requirements. IC Role / Device Role / Timing Role: Robust, thermally efficient buck converter with shutdown current <1µA for low-power standby modes. Use Value: 1µA shutdown quiescent current extends battery backup runtime; 3mm × 3mm LQFN simplifies thermal design in sealed enclosures with limited airflow. |
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 |
|---|---|---|---|
| LTC3310SEV#PBF | Lower 8A output rating; identical pinout, package, and feature set except reduced current capability and higher RDS(ON) (6.5mΩ NMOS/22mΩ PMOS) | Suitable for ≤8A loads where board area and thermal margin allow derating; not AEC-Q100 qualified | Select when full 12.5A capability is unnecessary and cost optimization is prioritized over automotive qualification. |
| MP2964GL-Z | Monolithic 12A buck with 3.3V–18V input; lacks Silent Switcher EMI performance, remote sense, and AEC-Q100 rating; uses different pinout and control scheme | Targeted at industrial/HV applications where input exceeds 5.5V; requires redesign for EMI-sensitive or automotive use cases | Consider only for non-automotive, non-EMI-critical 12A designs with >5.5V input; not a drop-in replacement. |
Compared with LTC3310SEV#PBF and MP2964GL-Z, the LTC3311SEV#PBF uniquely combines AEC-Q100 qualification, CISPR 25 Class 5 EMI performance, and 12.5A capability in a 3mm × 3mm footprint-making it the sole option for automotive-grade, high-density, low-noise POL applications requiring ≥12A.
Availability
LTC3311SEV#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive infotainment SoC rails, and 5G baseband ASIC power delivery requiring stable component supply across automotive, industrial, and communications end markets.
Supply support for LTC3311SEV#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 semiconductors, serving precision instrumentation, industrial automation, and automotive electronics markets.
The LTC3311SEV#PBF belongs to the Silent Switcher® family of high-efficiency, low-EMI DC/DC converters designed specifically for noise-sensitive, space-constrained applications in automotive ADAS, 5G infrastructure, and high-end computing.
FAQ
What is the maximum output current capability of the LTC3311SEV#PBF?
The LTC3311SEV#PBF delivers up to 12.5A continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB with 2oz copper, 4cm² exposed PGND pad). Derating applies above 60°C ambient; full 12.5A is supported at junction temperatures ≤125°C with appropriate heatsinking per the 9°C/W θJCbottom spec.
Does the LTC3311SEV#PBF support remote voltage sensing?
Yes, the LTC3311SEV#PBF supports true remote sense via the AGND pin, which serves as the Kelvin return for the FB divider's low-side resistor. This compensates for PCB trace resistance-induced voltage drops, maintaining ±1% output accuracy even with up to ±100mV ground offset between the IC and load.
How is EMI performance achieved in the LTC3311SEV#PBF without external filters?
The LTC3311SEV#PBF achieves CISPR 25 Class 5 radiated emissions compliance through Silent Switcher 2 architecture: integrated VIN bypass capacitors minimize hot-loop area, symmetrical SW node routing cancels magnetic fields, and optimized internal gate drive reduces dv/dt. No external EMI filters are required in standard layouts.
Can the LTC3311SEV#PBF be synchronized to an external clock source?
Yes, the LTC3311SEV#PBF supports synchronization via the MODE/SYNC pin, accepting external square-wave clocks from 0.5MHz to 2.25MHz. During sync, it operates in forced continuous mode, and the internal PLL locks to the external frequency within ~20µs of detection, enabling system-level timing coordination.
What protection features are integrated into the LTC3311SEV#PBF?
The LTC3311SEV#PBF integrates output overvoltage protection (105–115% VOUT), output short-circuit recovery with automatic soft-start reinitiation, thermal shutdown, die temperature monitoring (via SSTT pin), input UVLO with hysteresis, and both peak (15–21A) and valley (12–16A) current limiting to safeguard against overload and inductor saturation.
LTC3311SEV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311SEV#PBF FAQ
1.How can I place an order for LTC3311SEV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311SEV#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 LTC3311SEV#PBF reliable?
The price and inventory of LTC3311SEV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311SEV#PBF is usually 5 days.
3.What payment methods are accepted for LTC3311SEV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311SEV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311SEV#PBF?
LTC3311SEV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311SEV#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 LTC3311SEV#PBF?
For technical support, including LTC3311SEV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311SEV#PBF requirements.
6.How does Aetrix verify that LTC3311SEV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3311SEV#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 LTC3311SEV#PBF meets industry standards.
7.What is the process for return or replacement of LTC3311SEV#PBF?
All LTC3311SEV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311SEV#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 LTC3311SEV#PBF part is unused and in its original packaging.
Return procedure for LTC3311SEV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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