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Analog Devices Inc. LTC3309AEV#TRMPBF
- Part No.:
- LTC3309AEV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AEV#TRMPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:518
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Product details
Overview
LTC3309AEV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output current, operating from 2.25V to 5.5V input, regulating down to 0.5V with ±1% VFB accuracy, and featuring Silent Switcher architecture for ultralow EMI in optical networking and FPGA core supply applications.
For engineers reviewing the LTC3309AEV#TRMPBF datasheet, LTC3309AEV#TRMPBF pinout, LTC3309AEV#TRMPBF application, or LTC3309AEV#TRMPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode operation, and thermally enhanced 2mm × 2mm LQFN-12 package with exposed PGND pad.
Technical Context
The LTC3309AEV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its dual MOSFET power stage integrates an 8mΩ NMOS bottom switch and 31mΩ PMOS top switch, supporting up to 100% duty cycle for low-dropout operation.
Silent Switcher architecture employs symmetrical layout and integrated bypass capacitors to suppress common-mode EMI; MODE/SYNC pin selects among Burst Mode (40µA IQ), pulse-skip, or forced continuous operation-each with distinct ripple, efficiency, and noise trade-offs across load range.
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 without pre-regulation |
| IOUT Max | 6A continuous - sufficient for FPGA core, ASIC, or µP VDD domains with margin |
| VOUT Accuracy | ±1% over temperature - ensures stable logic supply under thermal stress |
| fSW Range | 1MHz to 3MHz - enables compact magnetics and avoids AM radio band |
| tON,min | 22ns - allows high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse skipping |
| Thermal Rating | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments |
| EMI Performance | Ultralow emissions per CISPR 25 Class 5 - eliminates need for external EMI filters in sensitive comms systems |
Pinout & Package
The LTC3309AEV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal resistance (θJB = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal at load |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables event-based power sequencing |
| VIN (3,8) | Main power input | Dual pins reduce IR drop and parasitic inductance; bypass separately to PGND and AGND |
| PGND (4,7,13) | Power ground return | Exposes main thermal path; Pin 13 (exposed pad) must be soldered to large PCB ground plane |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to inductor; requires short, wide copper trace |
| MODE/SYNC (9) | Mode select / clock sync | Configures Burst/Pulse Skip/Forced Continuous mode or accepts 1–3MHz external clock |
| RT (10) | Frequency programming | Resistor to AGND sets fSW; open or tied to VIN defaults to ~2MHz |
| PGOOD (11) | Power good indicator | Open-drain output asserting when VOUT is within –2%/+10% of regulation; includes 120µs delay |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT to AGND for precise output setting |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating costly shielding or filtering |
| Burst Mode® operation | Delivers 40µA quiescent current at light loads while maintaining <10mVPP output ripple |
| 22ns minimum on-time | Enables direct 5V-to-0.5V conversion at 2MHz without frequency foldback or instability |
| Internal compensation | Eliminates need for external Type II/III compensation network, reducing BOM count and layout sensitivity |
| 100% duty cycle capability | Supports dropout operation down to VIN – VOUT ≈ 80mV (at 6A), critical for battery end-of-life scenarios |
Applications
| Optical Networking Power Supply | FPGA Core Voltage Regulation |
|---|---|
Use Scenario: Providing clean, low-noise 1.2V supply to SerDes transceivers in 100G/400G line cards where EMI-induced bit errors must be avoided. IC Role / Device Role / Timing Role: Primary POL regulator converting 3.3V intermediate rail to FPGA SerDes core voltage with tight transient response. Use Value: Silent Switcher architecture meets CISPR 25 Class 5 limits without ferrite beads, saving board space and cost in dense optical modules. | Use Scenario: Delivering 6A at 0.85V to Xilinx Versal or Intel Agilex FPGA core banks during dynamic partial reconfiguration bursts. IC Role / Device Role / Timing Role: High-current, fast-transient buck converter with 22ns tON,min enabling stable 0.85V output from 3.3V input at 2MHz. Use Value: Peak current mode control and internal compensation ensure <50µs recovery from 1A–6A load steps without external tuning. |
| Automotive ADAS Domain Controller | Industrial PLC I/O Module |
Use Scenario: Powering vision processor SoCs (e.g., NVIDIA Orin) in camera ECU with AEC-Q100 Grade E qualification and extended temperature support. IC Role / Device Role / Timing Role: Main core supply IC operating from 5V vehicle bus, delivering 6A at 1.0V with thermal shutdown at 165°C. Use Value: –40°C to +125°C junction rating and overtemperature protection ensure reliability in engine bay mounting locations. | Use Scenario: Generating isolated 3.3V/5V rails for microcontroller and analog front-end in DIN-rail mounted PLCs exposed to industrial ambient swings. IC Role / Device Role / Timing Role: Compact, high-efficiency POL converter replacing discrete solutions in space-constrained I/O modules. Use Value: 2mm × 2mm LQFN package with exposed pad achieves θJA = 51°C/W, enabling 6A operation without heatsink in 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546B24RVFT | 40V max VIN, 10A output, requires external compensation; larger 4mm × 4mm QFN package | Better suited for higher-input industrial systems; lacks Silent Switcher EMI performance | Select when input exceeds 5.5V or >6A is required; avoid if EMI-sensitive or space-constrained |
| MP28164GQVE-0000-Z | 2.7–16V VIN, 6A, 1.2MHz fixed fSW, no MODE/SYNC pin, lower accuracy (±1.5% VFB) | Cost-optimized alternative for non-critical consumer applications; no Burst Mode or EMI optimization | Choose for budget-sensitive designs where ±1% accuracy and ultralow EMI are not mandatory |
Compared with TPS546B24RVFT and MP28164GQVE-0000-Z, the LTC3309AEV#TRMPBF uniquely combines sub-3mm² footprint, 22ns minimum on-time, Silent Switcher EMI suppression, and 40µA Burst Mode IQ-making it optimal for compact, noise-sensitive, battery-aware systems.
Availability
LTC3309AEV#TRMPBF is available at Aetrix Electronics and suitable for optical networking, FPGA core supplies, and automotive ADAS domain controllers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant variants.
Supply support for LTC3309AEV#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 precision instrumentation, communications, and industrial markets since 1965.
The LTC3309A product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck regulators targeting space- and noise-constrained applications including optical transceivers, FPGA/ASIC cores, and automotive infotainment systems.
FAQ
What is the maximum continuous output current of the LTC3309AEV#TRMPBF?
The LTC3309AEV#TRMPBF delivers up to 6A continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB, full PGND pad soldering). Derating applies above 70°C ambient; junction temperature must remain ≤125°C for guaranteed operation. The device features overcurrent protection that limits peak switch current to 9.6A (typical) and valley current to 7.8A to prevent damage during overload.
Does the LTC3309AEV#TRMPBF require external compensation components?
No, the LTC3309AEV#TRMPBF features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness. The internal loop is optimized for standard ceramic output capacitors and typical inductor values (e.g., 220nH), enabling stable operation across the full 1–3MHz frequency range without tuning.
How does the MODE/SYNC pin configure operating modes on the LTC3309AEV#TRMPBF?
The MODE/SYNC pin on the LTC3309AEV#TRMPBF selects three distinct operating modes: grounding enables pulse-skip mode (low-noise, fixed-frequency); tying to VIN enables Burst Mode® (40µA IQ, low-ripple); floating enables forced continuous mode (fixed-frequency, lowest output ripple). It also accepts 1–3MHz external clocks for synchronization, automatically adapting slope compensation-ensuring stable operation without manual adjustment.
What thermal performance can be expected from the LTC3309AEV#TRMPBF in a standard 2-layer PCB layout?
In a standard 2-layer JEDEC-compliant PCB (2S2P), the LTC3309AEV#TRMPBF achieves θJA = 51°C/W and θJB = 12°C/W. With the exposed PGND pad (Pin 13) fully soldered to a solid inner ground plane using ≥6 thermal vias, the device sustains 6A continuous output at TA = 70°C. Junction temperature is calculated as TJ = TA + (PD × 51°C/W); thermal shutdown activates at ~165°C to protect the IC.
Is the LTC3309AEV#TRMPBF pin-compatible with other members of the LTC330x family?
Yes, the LTC3309AEV#TRMPBF shares identical pinout and package with the LTC3307 (3A) and LTC3308 (4A), enabling scalable power design. All three use the same 2mm × 2mm LQFN-12 footprint and pin assignments (e.g., SW on Pins 5/6, PGND on Pins 4/7/13). This allows hardware reuse across different current requirements-simply swap the IC and adjust output filter components for optimal performance.
LTC3309AEV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- Package/Case:
- 12-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 2.25V
- Current - Output:
- 6A
- Frequency - Switching:
- Up to 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309AEV#TRMPBF FAQ
1.How can I place an order for LTC3309AEV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AEV#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 LTC3309AEV#TRMPBF reliable?
The price and inventory of LTC3309AEV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AEV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AEV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AEV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AEV#TRMPBF?
LTC3309AEV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AEV#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 LTC3309AEV#TRMPBF?
For technical support, including LTC3309AEV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AEV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309AEV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AEV#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 LTC3309AEV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AEV#TRMPBF?
All LTC3309AEV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AEV#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 LTC3309AEV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309AEV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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