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Analog Devices Inc. LTC3309BEV#TRMPBF
- Part No.:
- LTC3309BEV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BEV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,856
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Product details
Overview
LTC3309BEV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output at 1.8V from 2.5V–5.5V input, featuring 6.6MHz default switching frequency, 22ns minimum on-time, ±1% VFB accuracy, and Silent Switcher architecture for ultralow EMI in optical networking power supplies.
For engineers reviewing the LTC3309BEV#TRMPBF datasheet, LTC3309BEV#TRMPBF pinout, LTC3309BEV#TRMPBF application, or LTC3309BEV#TRMPBF equivalent, key selection criteria include its 2mm × 2mm LQFN package with exposed PGND pad, forced continuous/pulse-skip/Burst Mode operation, 0.5V feedback reference, and AEC-Q100-qualified temperature range (–40°C to +125°C).
Technical Context
The LTC3309BEV#TRMPBF uses constant-frequency peak current mode control with internal compensation, supporting programmable 3MHz–10MHz switching via RT resistor or external clock synchronization on MODE/SYNC. Its 22ns minimum on-time enables high VIN/VOUT ratios while maintaining regulation down to 0.5V output.
Silent Switcher architecture integrates split-power-path layout and integrated bypass capacitors to suppress common-mode EMI; Burst Mode delivers 40µA quiescent current with low-output-ripple regulation, and dual current limiting (9.6A peak, 7.8A valley) ensures robust overload handling without external sensing.
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 rails with margin |
| fSW Range | 3MHz to 10MHz - enables sub-1mm height inductors and compact POL designs |
| VFB Accuracy | ±1% over temperature - ensures stable 0.5V reference for precise output voltage setting |
| tON,min | 22ns - allows 1.8V output from 5.5V input at 6.6MHz without pulse skipping |
| Thermal Range | –40°C to +125°C junction - qualified for automotive infotainment and industrial edge compute |
| Quiescent Current | 40µA in Burst Mode - extends battery life in always-on sensor nodes and IoT endpoints |
Pinout & Package
The LTC3309BEV#TRMPBF 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 (θJA = 51°C/W) and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB and RT; 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 inductance; require parallel low-ESR ceramic bypass to PGND/AGND |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path and low-inductance return for bottom switch |
| SW (5,6) | Switch node | Dual pins minimize trace inductance to inductor; must be short, wide, and symmetric |
| 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 fSW from 3–10MHz; open or tied to VIN selects 6.6MHz default |
| PGOOD (11) | Power status indicator | Open-drain output with –2%/+10% window, 120µs delay, and fault pull-down during UVLO/shutdown |
| FB (12) | Feedback input | Regulates to 0.5V; connects to resistor divider between VOUT and AGND for output voltage programming |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for metal shielding in telecom modules |
| Low-ripple Burst Mode | Delivers 40µA IQ with <10mVPP output ripple at light loads-critical for noise-sensitive RF and ADC power domains |
| 100% duty cycle operation | Enables dropout operation down to VIN – ILOAD × RDS(ON), supporting brownout resilience in automotive start-stop systems |
| Internal compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity for fast design turnaround |
| AEC-Q100 qualification | Validated for automotive applications including infotainment, ADAS domain controllers, and body electronics |
Applications
| Optical Networking Power | Automotive Infotainment |
|---|---|
Use Scenario: Providing 1.8V/6A core supply to SFP+ transceivers and PON ONUs operating in dense rack environments with strict EMI limits. IC Role / Device Role / Timing Role: Primary POL regulator with Silent Switcher EMI suppression and 6.6MHz fixed frequency to avoid interference with 10Gbps data lanes. Use Value: Enables compliance with CISPR 32 Class B emissions without ferrite beads or shielded inductors, reducing bill-of-materials cost by 12%. | Use Scenario: Powering SoC cores in head-unit displays where ambient temperature exceeds 85°C and EMI must not disrupt AM/FM radio reception. IC Role / Device Role / Timing Role: High-efficiency synchronous buck delivering 1.2V/5A with Burst Mode for standby and forced continuous for active navigation rendering. Use Value: Maintains ±1% output accuracy across –40°C to +125°C junction, eliminating need for external voltage monitoring ICs. |
| FPGA Core Supply | Distributed Telecom POL |
Use Scenario: Generating 0.85V/6A for Xilinx Artix-7 FPGA banks with fast transient response to logic switching events. IC Role / Device Role / Timing Role: Monolithic step-down converter with 22ns minimum on-time and internal slope compensation for stable 6A delivery at 1MHz+ bandwidth. Use Value: Achieves <50µs recovery from 0A→6A load step with <25mV undershoot, preventing FPGA configuration errors. | Use Scenario: Point-of-load conversion in 48V intermediate bus architectures for base station radios requiring low-profile, high-density power. IC Role / Device Role / Timing Role: Compact 2mm × 2mm POL regulator synchronized to system clock to eliminate beat frequencies in multi-rail systems. Use Value: Reduces solution footprint by 45% vs legacy 3mm × 3mm solutions while maintaining 92% efficiency at 3.3V/6A output. |
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 |
|---|---|---|---|
| TPS546B24A | 40V max VIN, 10A output, PMBus interface, larger 4mm × 4mm QFN | Targeted at higher-input-voltage server VRMs; lacks Silent Switcher EMI performance | Select when digital control, telemetry, or >5.5V input is required; not suitable for space-constrained EMI-critical designs |
| MP28164GQ | 6A output, 5.5V max VIN, 2.5MHz default fSW, no Burst Mode, smaller 1.6mm × 1.6mm QFN | Lower EMI suppression, no AEC-Q100 qualification, limited light-load efficiency | Choose for cost-sensitive consumer applications where 40µA IQ and automotive qualification are unnecessary |
Compared with TPS546B24A and MP28164GQ, the LTC3309BEV#TRMPBF uniquely combines ultralow EMI, 6.6MHz operation in a 2mm × 2mm footprint, and AEC-Q100 qualification-making it optimal for compact, noise-sensitive, automotive-grade POL designs where size and emissions are non-negotiable.
Availability
LTC3309BEV#TRMPBF is available at Aetrix Electronics and suitable for optical networking, automotive infotainment, and FPGA core power applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3309BEV#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.
The LTC3309BEV#TRMPBF belongs to the Silent Switcher® family of high-frequency DC/DC converters engineered for EMI-critical applications such as optical transceivers, automotive radar, and medical imaging systems.
FAQ
What is the maximum output current capability of the LTC3309BEV#TRMPBF?
The LTC3309BEV#TRMPBF delivers up to 6A continuous output current under typical thermal conditions with adequate PCB copper area. Its peak current limit is 9.6A (typical), and valley current limit is 7.8A, enabling robust overload tolerance. Derating applies above +85°C ambient; full 6A is guaranteed at junction temperatures ≤125°C with proper thermal design using the exposed PGND pad.
How does the MODE/SYNC pin configure operating modes on the LTC3309BEV#TRMPBF?
The MODE/SYNC pin on the LTC3309BEV#TRMPBF selects three distinct modes: grounding enables Pulse Skip mode for low-noise operation; tying to VIN activates low-ripple Burst Mode with 40µA quiescent current; floating enables Forced Continuous mode for fixed-frequency, minimal-output-ripple performance. When driven by an external 3–10MHz square wave, it synchronizes the internal oscillator while enforcing Forced Continuous mode.
Can the LTC3309BEV#TRMPBF operate with a 2.25V input supply?
Yes, the LTC3309BEV#TRMPBF operates from 2.25V to 5.5V input. At 2.25V, its minimum regulated output is 0.5V, and efficiency remains >85% at 1.8V/3A with 6.6MHz switching. However, RDS(ON) increases at low VIN, so thermal design must account for higher conduction losses-verified in the datasheet's "Switch On Resistance" curves across temperature and input voltage.
What is the purpose of the AGND pin on the LTC3309BEV#TRMPBF?
The AGND pin on the LTC3309BEV#TRMPBF serves as the remote ground sense reference for the FB and RT circuits and as the analog ground for internal error amplifiers and references. It must be connected directly to the output capacitor's negative terminal at the load-not to PGND-to enable accurate remote sensing and minimize regulation error from PCB trace IR drops.
Does the LTC3309BEV#TRMPBF support output voltage synchronization to an external clock?
No, the LTC3309BEV#TRMPBF does not synchronize output voltage phase; it synchronizes only the internal switching frequency via the MODE/SYNC pin. The device maintains regulation independently using peak current mode control. External clock synchronization locks the SW node timing to the input clock edge but does not alter feedback loop behavior or output voltage tracking-only switching frequency and EMI spectral placement.
LTC3309BEV#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:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 6A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BEV#TRMPBF FAQ
1.How can I place an order for LTC3309BEV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BEV#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 LTC3309BEV#TRMPBF reliable?
The price and inventory of LTC3309BEV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BEV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BEV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BEV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BEV#TRMPBF?
LTC3309BEV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BEV#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 LTC3309BEV#TRMPBF?
For technical support, including LTC3309BEV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BEV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309BEV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BEV#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 LTC3309BEV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BEV#TRMPBF?
All LTC3309BEV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BEV#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 LTC3309BEV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309BEV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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