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Analog Devices Inc. LTC3309BEV#TRPBF
- Part No.:
- LTC3309BEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BEV#TRPBF.pdf
- Description:
- IC REG BUCK 6A
- Quantity:
- Payment:
- Shipping:
Inventory:2,582
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Product details
Overview
LTC3309BEV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output current, operating from 2.25V–5.5V input and regulating down to 0.5V with ±1% accuracy. It uses peak current mode control at 3MHz–10MHz, achieves 22ns minimum on-time, integrates 8mΩ NMOS and 31mΩ PMOS power switches, and employs Silent Switcher architecture for ultralow EMI-ideal for space-constrained FPGA core supplies and optical networking POL rails.
For engineers reviewing the LTC3309BEV#TRPBF datasheet, LTC3309BEV#TRPBF pinout, LTC3309BEV#TRPBF application, or LTC3309BEV#TRPBF equivalent, key selection considerations include its 2mm × 2mm LQFN package with exposed PGND pad, programmable switching frequency via RT resistor or external SYNC clock, Burst Mode operation with 40µA quiescent current, and AEC-Q100-qualified temperature range (–40°C to +125°C).
Technical Context
The LTC3309BEV#TRPBF implements constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its architecture supports three selectable operating modes-forced continuous, pulse skip, and low-ripple Burst Mode-each determined by MODE/SYNC pin voltage level and optimized for noise, efficiency, or ripple performance.
It integrates dual power switches (8mΩ NMOS / 31mΩ PMOS), provides forward/reverse inductor current limiting (9.6A peak / 7.8A valley), includes output overvoltage protection (110% threshold), thermal shutdown at 165°C, and supports 100% duty cycle dropout operation. The device synchronizes to external clocks (3–10MHz) with automatic slope compensation adaptation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, USB PD, or 3.3V/5V intermediate rails. |
| VOUT Range | 0.5V to VIN - supports sub-1V FPGA/ASIC core supplies and scalable POL architectures. |
| Output Accuracy | ±1% over temperature - ensures stable voltage margins for high-speed digital loads. |
| Switching Frequency | 3MHz–10MHz (programmable) - allows optimization of inductor size vs. efficiency trade-off. |
| Min On-Time | 22ns - enables high VIN/VOUT ratios (e.g., 5V→1.8V at 6.6MHz) without pulse skipping. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on IoT and automotive infotainment systems. |
| Thermal Rating | Junction temp –40°C to +125°C - qualified per AEC-Q100 Grade E for automotive under-hood use. |
| EMI Performance | Silent Switcher architecture - reduces radiated emissions >30dB vs. conventional buck converters. |
Pinout & Package
The LTC3309BEV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), requiring soldering 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-driven 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 | Primary return path for bottom switch; exposed pad is critical for thermal and EMI performance. |
| SW (5,6) | Switch node output | Drives external inductor; must be routed as short/wide copper trace to minimize ringing. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures Burst/Pulse Skip/Forced Continuous modes or accepts 3–10MHz external clock. |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; open or tied to VIN selects default 6.6MHz. |
| PGOOD (11) | Power status indicator | Open-drain output with 120µs delay and ±1.2%/±2.2% hysteresis for reliable system monitoring. |
| FB (12) | Feedback input | Regulates VOUT by holding 500mV at this pin; connects to resistor divider from VOUT to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces EMI emissions by >30dB through balanced SW node layout and integrated input caps. |
| Low-ripple Burst Mode | Delivers 40µA IQ at light loads while maintaining <10mVPP output ripple-critical for noise-sensitive analog circuits. |
| 22ns minimum on-time | Enables 5V→1.8V conversion at 6.6MHz without duty-cycle limitation, minimizing solution footprint. |
| Internal compensation | Eliminates need for external compensation network-reduces BOM count and design validation effort. |
| AEC-Q100 qualification | Validated for automotive applications including infotainment, ADAS camera modules, and body control units. |
| 100% duty-cycle operation | Supports ultra-low dropout (e.g., 3.3V→3.0V) with only RDS(ON) and inductor DCR losses. |
Applications
| FPGA Core Supply | Optical Networking POL |
|---|---|
Use Scenario: Powering Xilinx Kria KV260 or Intel Agilex FPGA core rails requiring 0.8V/6A with tight transient response. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering regulated core voltage with <50ns load-step response. Use Value: 22ns min on-time and 6.6MHz switching enable compact 1.1×1.1mm inductor placement adjacent to FPGA BGA. | Use Scenario: Providing 3.3V/6A bias to 100G coherent transceivers in CFP2-ACO modules with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise POL converter synchronized to system clock to avoid beat frequencies in RF front-end. Use Value: Silent Switcher architecture meets CISPR 22 Class B radiated emissions without shielding cans or ferrites. |
| Automotive Infotainment | Industrial PLC I/O Module |
Use Scenario: Supplying 1.2V/4A to ARM Cortex-A76 application processor in head unit with cold-crank (4.5V min) support. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in Burst Mode during display-off state to extend battery runtime. Use Value: 40µA quiescent current and AEC-Q100 Grade E rating ensure compliance with ISO 16750-2 automotive electrical environment. | Use Scenario: Generating 5V/6A for isolated RS-485 transceivers and microcontroller peripherals in DIN-rail mounted PLC. IC Role / Device Role / Timing Role: Robust POL regulator with overvoltage, overcurrent, and thermal protection for unattended industrial deployment. Use Value: Integrated 31mΩ PMOS/8mΩ NMOS switches and 165°C thermal shutdown prevent field failures under sustained overload. |
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 |
|---|---|---|---|
| MP2451DT-LF-Z | Fixed 2.2MHz switching, 3A max output, no SYNC pin, higher Qg MOSFETs (12/45mΩ) | Limited to lower-current applications; lacks Burst Mode and EMI optimization | Choose for cost-sensitive, non-EMI-critical 3A designs where board space is less constrained. |
| TPS546B24RVFT | 6A, 1.5V–5.5V input, PMBus interface, 4mm × 4mm QFN, 12-bit VID control | Requires digital configuration; larger footprint; targets server VR13/IMVP8 compliance | Choose when dynamic voltage scaling, telemetry, or multi-rail coordination is required in datacenter applications. |
Compared with MP2451DT-LF-Z and TPS546B24RVFT, the LTC3309BEV#TRPBF uniquely combines ultra-small 2mm × 2mm packaging, 3–10MHz programmability, Silent Switcher EMI reduction, and 40µA Burst Mode IQ-making it optimal for space- and noise-constrained portable and automotive POL systems where analog simplicity and reliability are prioritized over digital configurability.
Availability
LTC3309BEV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, optical networking POL rails, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3309BEV#TRPBF 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 LTC3309B belongs to Analog Devices' Power by Linear™ family of high-density DC/DC regulators, designed specifically for ultra-compact, low-EMI point-of-load conversion in FPGA, ASIC, and automotive subsystems.
FAQ
What is the maximum output current capability of the LTC3309BEV#TRPBF?
The LTC3309BEV#TRPBF delivers up to 6A continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB, 1-in² copper). Peak current limit is 9.6A (typical), but sustained 6A operation requires proper thermal design-including soldering the exposed PGND pad to a large PCB ground plane-to maintain junction temperature below 125°C.
Does the LTC3309BEV#TRPBF support external clock synchronization?
Yes, the LTC3309BEV#TRPBF supports external clock synchronization via the MODE/SYNC pin. Applying a 3MHz–10MHz square wave (VH > 1.2V, VL < 0.4V, min pulse width 40ns) locks the internal oscillator to the external source while automatically adapting slope compensation. During sync, the device operates exclusively in forced continuous mode.
What is the purpose of the AGND pin on the LTC3309BEV#TRPBF?
The AGND pin on the LTC3309BEV#TRPBF serves as the remote output voltage sense return and analog ground reference for internal circuitry. It must be connected directly to the negative terminal of the output capacitor at the load-not to PGND-to enable accurate regulation and minimize load-induced errors. Bypass capacitors for VIN should also reference AGND.
How does the LTC3309BEV#TRPBF achieve ultralow EMI performance?
The LTC3309BEV#TRPBF achieves ultralow EMI through its patented Silent Switcher architecture: symmetrical SW node layout cancels magnetic fields, integrated input capacitors minimize high-di/dt loops, and the 2mm × 2mm package reduces parasitic inductance. This eliminates the need for external EMI filters or metal shielding in most applications compliant with CISPR 22/32 Class B.
Can the LTC3309BEV#TRPBF operate with an input voltage as low as 2.25V?
Yes, the LTC3309BEV#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, RDS(ON) increases slightly, so thermal design must account for higher conduction losses. The 22ns minimum on-time ensures stable regulation even at high step-down ratios (e.g., 2.25V→0.5V) when using appropriate inductor DCR and output capacitance.
LTC3309BEV#TRPBF 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:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BEV#TRPBF FAQ
1.How can I place an order for LTC3309BEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BEV#TRPBF 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 LTC3309BEV#TRPBF reliable?
The price and inventory of LTC3309BEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BEV#TRPBF?
LTC3309BEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BEV#TRPBF 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 LTC3309BEV#TRPBF?
For technical support, including LTC3309BEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BEV#TRPBF requirements.
6.How does Aetrix verify that LTC3309BEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BEV#TRPBF 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 LTC3309BEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BEV#TRPBF?
All LTC3309BEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BEV#TRPBF, 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 LTC3309BEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309BEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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