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Analog Devices Inc. LTC3313EV#PBF
- Part No.:
- LTC3313EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-PowerTFQFN
- Datasheet:
-
LTC3313EV#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,238
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Product details
Overview
LTC3313EV#PBF from Analog Devices is a monolithic, Silent Switcher® step-down DC/DC converter delivering up to 15A output current from a 2.25V–5.5V input, featuring 500mV feedback reference, 35ns minimum on-time, and ±1% VOUT accuracy with remote sense. It operates in automotive-grade environments (–40°C to 125°C) and targets high-current FPGA, ASIC, and µP core supplies.
For engineers reviewing the LTC3313EV#PBF datasheet, LTC3313EV#PBF pinout, LTC3313EV#PBF application, or LTC3313EV#PBF equivalent, this page delivers verified electrical parameters, thermal-aware package layout guidance, multiphase synchronization capability, and real-world EMI-optimized design constraints - all specific to the 18-pin 3mm × 3mm LQFN variant.
Technical Context
The LTC3313EV#PBF implements constant-frequency peak current mode control with internal 500mV reference and programmable switching frequency (0.5–5MHz via RT resistor). Its dual MOSFET power stage uses 3mΩ NMOS and 8mΩ PMOS switches, enabling high efficiency at 2MHz operation while maintaining 100% duty cycle for low-dropout regulation.
Silent Switcher 1 architecture minimizes EMI through symmetrical VIN/PGND loop routing and integrated flip-chip layout; MODE/SYNC pin supports both external clock synchronization (0.5–2.25MHz) and multiphase paralleling, while SSTT pin provides soft-start ramping, voltage tracking, and die temperature monitoring (4mV/°C).
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 automotive cold-crank conditions down to 2.25V. |
| Max Output Current | 15A - sustained delivery enabled by thermally enhanced 3mm × 3mm LQFN with exposed PGND pad and θJCbottom = 5.8°C/W. |
| Feedback Reference | 500mV ±1% - enables precise low-voltage outputs (0.5V to VIN) with remote sensing for <±100mV ground offset compensation. |
| Switching Frequency | Programmable 0.5–5MHz - higher frequencies reduce inductor/capacitor size but require minimum on-time (35ns) compliance for high VIN/VOUT ratios. |
| Power Loss Protection | Thermal shutdown + output short-circuit recovery - valley-current limiting (15–19A) prevents runaway during overload; SSTT-triggered soft-start ensures clean fault recovery. |
| EMI Performance | Ultralow emissions per CISPR 25 Class 5 - achieved via Silent Switcher 1 layout, integrated VIN decoupling paths, and symmetrical SW node routing. |
| Enable Threshold | Precision 400mV rising threshold with 60mV hysteresis - allows accurate sequencing control using external resistor dividers without additional bias circuitry. |
Pinout & Package
Package: 18-pin 3mm × 3mm × 0.95mm LQFN with exposed thermal pad (Pin 19 = PGND), θJA = 39.6°C/W, requiring soldered PCB connection for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Active-high precision enable with 400mV threshold; pulls device into 1µA shutdown when below hysteresis. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for FB divider low-side; compensates for PCB ground bounce up to ±100mV vs local GND. |
| VIN (3,4,11,12) | Main input power supply | Four parallel pins reduce IR drop and inductance; must be short-traced and locally bypassed to PGND with low-ESR capacitors. |
| PGND (5,10,19) | Power ground return path | Three dedicated pins + exposed pad form primary thermal conduction path; requires ≥6 thermal vias to inner ground plane. |
| SW (6–9) | Switch node output | Four paralleled SW pins drive external inductor; minimize trace length/loop area to preserve Silent Switcher EMI advantage. |
| MODE/SYNC (13) | Multiphase sync & mode selection | Configures pulse-skipping vs forced continuous mode; accepts external clock (0.5–2.25MHz) or outputs synchronized clock for paralleling. |
| PGOOD (14) | Power-good open-drain output | Asserts high when VOUT is within ±3% of regulation; 125µs delay filters transient dips; wired-OR compatible for multi-phase systems. |
| RT (15) | Oscillator frequency programming | Resistor-to-AGND sets fSW from 0.5–5MHz; RT = 274kΩ yields nominal 2MHz default operation. |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current source ramps external capacitor for controlled VOUT rise; transitions to 4mV/°C die temp readout post-startup. |
| ITH (17) | Loop compensation node | Connects external RC network to AGND for stability tuning; directly controls peak inductor current via error amplifier servo. |
| FB (18) | Feedback voltage input | Regulated to 500mV; connects to resistive divider from VOUT; phase-lead cap from FB to VOUT optimizes transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >20dB vs conventional QFN buck converters, eliminating need for metal shields in space-constrained POL designs. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VIN ≈ VOUT + ILOAD × (RDS(ON)_PMOS + DCR_L), critical for battery-powered systems near end-of-discharge. |
| Configurable Multiphase Support | Multiple LTC3313EV#PBF units can be synchronized and interleaved via MODE/SYNC pin to scale output current beyond 15A with reduced ripple. |
| Dual Current Limit Protection | Peak switch limit (18–24A) + valley switch limit (15–19A) prevent saturation-induced failure during overload or short-circuit events. |
| Digital Temperature Monitoring | SSTT pin outputs 4mV/°C analog voltage proportional to junction temperature - enables real-time thermal derating without external sensors. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade E: –40°C to 125°C), including engine control units, ADAS domain controllers, and infotainment power rails. |
Applications
| FPGA Core Supply | Automotive ADAS Processor Rail |
|---|---|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA cores requiring tightly regulated 0.8V @ 12A with fast load-step response. IC Role / Device Role / Timing Role: Primary POL regulator with remote sense, programmable 2MHz switching, and PGOOD sequencing handshake. Use Value: ±1% VOUT accuracy over line/load/temp ensures logic stability; 35ns min-on-time supports 0.8V output from 3.3V rail without duty-cycle limitation. |
Use Scenario: Supplying NVIDIA Orin or Qualcomm SA8540P SoCs in camera radar fusion modules operating in under-hood environments. IC Role / Device Role / Timing Role: AEC-Q100-compliant 1.1V/15A core rail with thermal monitoring via SSTT and fault-safe PGOOD reporting. Use Value: Junction temperature readout enables dynamic frequency scaling; Silent Switcher EMI margin meets CISPR 25 Class 5 for safety-critical vision processing. |
| Server DDR5 Memory VDDQ | Industrial PLC I/O Module Supply |
Use Scenario: Delivering 1.25V @ 10A to DDR5 memory subsystems with strict ±3% tolerance and <10µs transient recovery. IC Role / Device Role / Timing Role: High-bandwidth current-mode controller with 2MHz forced continuous mode and optimized loop compensation via ITH. Use Value: 15A capability with 3mΩ/8mΩ RDS(ON) yields >92% efficiency at full load; multiphase support scales to 30A for dual-rank configurations. |
Use Scenario: Generating isolated 3.3V/5A supply for EtherCAT slave controllers in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Robust industrial-grade POL with UVLO (2.2V), thermal shutdown, and EN-controlled hot-swap sequencing. Use Value: 2.25V minimum VIN supports brownout resilience; 125°C max junction rating ensures reliability in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPM3695-100 from Monolithic Power Systems | 10A rated, 2.7–16V input, integrated inductor, fixed 500mV reference, no remote sense or SSTT temp monitor. | Targeted at space-constrained consumer/industrial apps where board area > efficiency; lacks automotive qualification and multiphase sync. | Select when BOM count reduction and ease of layout outweigh need for 15A output, remote sensing, or thermal telemetry. |
| TPS546D24A from Texas Instruments | 15A, 3–16V input, PMBus interface, 0.5% reference accuracy, digital loop compensation, no Silent Switcher EMI advantage. | Used in datacenter VR13/VR14 compliant systems requiring telemetry, margining, and dynamic voltage scaling via I2C. | Select when digital control, telemetry, and programmable margins are required over analog simplicity and ultralow EMI. |
Compared with MPM3695-100 and TPS546D24A, the LTC3313EV#PBF uniquely combines 15A analog current-mode control, Silent Switcher EMI performance, AEC-Q100 qualification, and integrated die temperature monitoring - making it optimal for high-reliability, noise-sensitive, thermally demanding embedded power rails.
Availability
LTC3313EV#PBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS processors, server DDR5 memory rails, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3313EV#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 precision instrumentation, industrial automation, communications infrastructure, and automotive markets.
The LTC3313EV#PBF belongs to Analog Devices' Power by Linear™ family of ultralow-noise, high-efficiency DC/DC converters designed specifically for noise-sensitive, high-current point-of-load applications in automotive, computing, and industrial systems.
FAQ
What is the maximum output current capability of the LTC3313EV#PBF under continuous operation?
The LTC3313EV#PBF delivers up to 15A of continuous output current when properly thermally managed - verified with 3mm × 3mm LQFN package, ≥6 thermal vias to solid ground plane, and 2oz copper layers. Derating applies above 85°C ambient; full 15A is guaranteed at TA ≤ 70°C with recommended PCB layout per datasheet Figure 1.
Does the LTC3313EV#PBF support remote voltage sensing, and how is it implemented?
Yes, the LTC3313EV#PBF supports true remote voltage sensing via its dedicated AGND pin. Connect AGND directly to the negative terminal of the output capacitor at the load, and tie the bottom resistor of the FB divider to AGND - not local GND. This configuration compensates for up to ±100mV ground potential difference, ensuring ±1% VOUT accuracy at the point of load.
How does the MODE/SYNC pin function in multiphase configurations using multiple LTC3313EV#PBF devices?
In multiphase operation, one LTC3313EV#PBF acts as master (MODE/SYNC driven by external clock or set to default 2MHz), while others configure MODE/SYNC as input to accept that clock. Phase offsets are automatically generated via RT pin resistor value variation - e.g., RT = 274kΩ (0°), 243kΩ (–30°), 215kΩ (–60°) - enabling interleaved 120° or 180° operation to reduce input/output ripple.
What protection features are built into the LTC3313EV#PBF to handle output short-circuit conditions?
The LTC3313EV#PBF employs dual-level current limiting: peak switch current (18–24A) and valley switch current (15–19A). During a short, valley limiting holds off the top switch until inductor current falls below threshold. Recovery initiates a full soft-start cycle triggered by SSTT pin pull-down - ensuring controlled re-entry without voltage overshoot or latch-up.
Is the LTC3313EV#PBF qualified for automotive applications, and what grade does the #PBF suffix indicate?
Yes, the LTC3313EV#PBF is AEC-Q100 qualified for automotive use. The "E" in LTC3313EV denotes the industrial/automotive temperature grade (–40°C to +125°C junction), and "#PBF" indicates lead-free, RoHS-compliant packaging. It is approved for engine bay, infotainment, and ADAS subsystems meeting stringent automotive reliability and lifetime requirements.
LTC3313EV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-PowerTFQFN
- 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:
- 15A
- Frequency - Switching:
- 500kHz ~ 5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3313EV#PBF FAQ
1.How can I place an order for LTC3313EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3313EV#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 LTC3313EV#PBF reliable?
The price and inventory of LTC3313EV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3313EV#PBF is usually 5 days.
3.What payment methods are accepted for LTC3313EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3313EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3313EV#PBF?
LTC3313EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3313EV#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 LTC3313EV#PBF?
For technical support, including LTC3313EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3313EV#PBF requirements.
6.How does Aetrix verify that LTC3313EV#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3313EV#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 LTC3313EV#PBF meets industry standards.
7.What is the process for return or replacement of LTC3313EV#PBF?
All LTC3313EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3313EV#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 LTC3313EV#PBF part is unused and in its original packaging.
Return procedure for LTC3313EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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