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Analog Devices Inc. LTC3309AEV#TRPBF
- Part No.:
- LTC3309AEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AEV#TRPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:10,907
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Product details
Overview
LTC3309AEV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A continuous output current, operating from 2.25V–5.5V input and regulating down to 0.5V with ±1% feedback accuracy. It features Silent Switcher® architecture for ultralow EMI, 22ns minimum on-time for fast transient response, and supports forced continuous, pulse-skip, or low-ripple Burst Mode® operation-ideal for FPGA core supplies and battery-powered telecom systems.
For engineers reviewing the LTC3309AEV#TRPBF datasheet, LTC3309AEV#TRPBF pinout, LTC3309AEV#TRPBF application, or LTC3309AEV#TRPBF equivalent, key selection criteria include its 2mm × 2mm LQFN package, 1MHz–3MHz programmable switching frequency, 8mΩ NMOS / 31mΩ PMOS RDS(ON), integrated power good signal, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3309AEV#TRPBF uses peak current mode control with internal compensation and a 22ns minimum on-time, enabling stable regulation at high duty cycles and ultra-low output voltages. Its Silent Switcher® architecture employs symmetrical layout and integrated bypass capacitors to suppress common-mode EMI without external filters.
Three selectable operating modes-forced continuous (floating MODE/SYNC), pulse-skip (MODE/SYNC grounded), or Burst Mode® (MODE/SYNC tied to VIN)-allow trade-offs between light-load efficiency (40µA IQ in Burst), output ripple (<10mVPP in FC), and EMI performance. Clock synchronization via MODE/SYNC supports deterministic timing in multi-rail systems.
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. |
| VOUT Range | 0.5V to VIN - enables direct core supply for modern FPGAs and ASICs requiring sub-1V rails. |
| Output Accuracy | ±1% over temperature - ensures stable voltage margining for sensitive digital loads. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable) - allows optimization of inductor size vs. efficiency in space-constrained designs. |
| RDS(ON) | 8mΩ (NMOS), 31mΩ (PMOS) - minimizes conduction loss at 6A, supporting >92% efficiency at 3.3V→1.2V/3A. |
| Quiescent Current | 40µA in Burst Mode® sleep - extends battery runtime in always-on IoT edge nodes. |
| Thermal Rating | –40°C to +125°C junction - qualified for industrial and automotive under-hood applications. |
Pinout & Package
The LTC3309AEV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for low θJA = 51°C/W. The package requires soldering the exposed pad to a PCB ground plane using ≥6 thermal vias for optimal thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power sequencing with external resistor dividers. |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; require local 1µF 0201 ceramic bypass to AGND and PGND. |
| PGND (4,7,13) | Power ground return | Primary thermal path; exposed pad (13) must be soldered to large PCB ground plane for <12°C/W θJB. |
| SW (5,6) | Switch node | High dv/dt node connecting internal MOSFETs to inductor; requires short, wide copper pour to minimize EMI. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures Burst/Pulse-Skip/Forced Continuous modes or accepts 1–3MHz external clock for system-level timing alignment. |
| RT (10) | Frequency programming | Resistor-to-AGND sets fSW; open-circuit defaults to 2MHz; ignored when external clock applied to MODE/SYNC. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% of target; includes 120µs delay and OV/UV fault detection. |
| FB (12) | Feedback input | Senses 500mV reference; connects to resistor divider from VOUT to AGND to set output voltage precisely. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >30dB vs. conventional buck converters, eliminating need for ferrite beads or metal shields in compact layouts. |
| 22ns Minimum On-Time | Enables 1.2V output from 2.5V input at 2MHz (48% duty cycle), supporting high-frequency POL conversion without duty-cycle limitation. |
| Burst Mode® Operation | Delivers 40µA quiescent current and <10mVPP output ripple at light loads-critical for always-on sensor nodes and standby power domains. |
| 100% Duty Cycle Capability | Maintains regulation during input droop (e.g., battery discharge), minimizing dropout voltage with only PMOS RDS(ON) loss. |
| Integrated Protection | Includes output overvoltage lockout (110% VOUT), thermal shutdown (165°C), short-circuit recovery with valley-current limiting, and UVLO hysteresis. |
Applications
| Optical Networking Line Cards | FPGA Core Power Delivery |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 0.85V/6A core supply to Xilinx Versal ACAPs in pluggable transceivers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote AGND sensing and PGOOD sequencing for multi-rail startup. Use Value: 22ns min-on-time enables 2MHz operation at 0.85V out, reducing inductor size by 40% vs. 1MHz alternatives while maintaining <±1% load regulation. |
Use Scenario: Delivering dynamic 1.0V–1.2V core voltage to Intel Agilex FPGAs with rapid load transients up to 4.5A/µs. IC Role / Device Role / Timing Role: High-bandwidth, internally compensated DC/DC controller with forced continuous mode for minimal output ripple during logic switching. Use Value: Peak current mode control + 22ns on-time delivers <10µs load-step recovery, preventing logic errors during burst-mode computation. |
| Automotive ADAS Domain Controllers | Industrial PLC I/O Modules |
|
Use Scenario: Powering vision processor SoCs (e.g., NVIDIA Orin) in camera ECU modules requiring AEC-Q100 compliance and low EMI. IC Role / Device Role / Timing Role: AEC-Q100 Grade E (–40°C to +125°C) step-down converter with Silent Switcher® EMI suppression for CISPR-25 Class 5 compliance. Use Value: Integrated EMI reduction eliminates external filtering components, saving board space and BOM cost in tight ECU enclosures. |
Use Scenario: Generating isolated 3.3V/2A auxiliary rail from 24V DC field bus in modular I/O backplanes. IC Role / Device Role / Timing Role: High-efficiency POL converter operating in Burst Mode® during idle periods to meet <100mW standby power targets. Use Value: 40µA IQ in sleep mode reduces annual energy consumption by >2.5kWh per module in 24/7 deployed systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3A rated, 2MHz fixed frequency, no Burst Mode®, higher 150µA IQ, SOIC-8 package (3.9mm × 4.9mm). | Lacks remote sensing, EMI suppression, and automotive qualification; suitable only for cost-sensitive non-automotive 3A applications. | Select only if 3A output suffices and board area allows larger SOIC footprint; not drop-in due to pinout and feature mismatch. |
| TPS546B24RVFT | 6A, 1.5V–5.5V input, 0.5V–3.3V output, 0.5% accuracy, but 3.5mm × 3.5mm QFN-16, no Silent Switcher®. | Higher accuracy and PMBus interface, but larger size and higher EMI require external filtering for noise-sensitive analog sections. | Prefer for digitally controlled systems needing telemetry; avoid where EMI or 2mm × 2mm footprint is mandatory. |
Compared with MP2451DT-LF-Z and TPS546B24RVFT, the LTC3309AEV#TRPBF uniquely combines 6A capability, 2mm × 2mm size, Silent Switcher® EMI performance, and AEC-Q100 qualification-making it the only choice for space-constrained, noise-sensitive, automotive-grade POL designs.
Availability
LTC3309AEV#TRPBF is available at Aetrix Electronics and suitable for optical networking line cards, automotive ADAS domain controllers, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3309AEV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3309A belongs to Analog Devices' Power by Linear™ family of high-efficiency, low-EMI DC/DC regulators designed specifically for demanding point-of-load applications in space-, noise-, and reliability-critical systems.
FAQ
What is the maximum continuous output current of the LTC3309AEV#TRPBF?
The LTC3309AEV#TRPBF delivers up to 6A continuous output current under typical thermal conditions (θJA = 51°C/W, TA ≤ 85°C). Derating applies above 85°C ambient or with reduced airflow; at 125°C junction, output current is limited to ~4.2A to maintain safe thermal operation. The device includes valley-current limiting to protect against overload and short-circuit faults.
Does the LTC3309AEV#TRPBF support output voltages below 1V?
Yes, the LTC3309AEV#TRPBF regulates output voltages as low as 0.5V using an external resistor divider on the FB pin, referenced to its precise 500mV internal bandgap. At 0.5V output, the ±1% accuracy specification holds across temperature and line/load conditions, making it suitable for advanced FPGA and ASIC core rails requiring sub-1V operation.
How does the Silent Switcher® architecture reduce EMI in the LTC3309AEV#TRPBF?
The LTC3309AEV#TRPBF implements Silent Switcher® architecture through symmetrical internal power switch layout, integrated input bypass capacitors, and optimized SW node routing-reducing magnetic field coupling and common-mode EMI by >30dB compared to conventional buck converters. This eliminates the need for external EMI filters in most Class B applications, simplifying layout and lowering system cost.
Can the LTC3309AEV#TRPBF be synchronized to an external clock source?
Yes, the LTC3309AEV#TRPBF supports clock synchronization via its MODE/SYNC pin, accepting square-wave inputs from 1MHz to 3MHz. During synchronization, the device operates in forced continuous mode with automatic slope compensation adaptation, enabling deterministic timing in multi-phase or noise-sensitive systems without requiring changes to the RT resistor network.
What protection features are integrated into the LTC3309AEV#TRPBF?
The LTC3309AEV#TRPBF integrates output overvoltage protection (110% VOUT trip), thermal shutdown (165°C), short-circuit recovery with valley-current limiting, input UVLO with hysteresis, and PGOOD fault reporting. These protections operate independently of external components, ensuring robust operation in unattended industrial and automotive environments without additional supervision circuitry.
LTC3309AEV#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3309AEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AEV#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 LTC3309AEV#TRPBF reliable?
The price and inventory of LTC3309AEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AEV#TRPBF?
LTC3309AEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AEV#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 LTC3309AEV#TRPBF?
For technical support, including LTC3309AEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AEV#TRPBF requirements.
6.How does Aetrix verify that LTC3309AEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AEV#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 LTC3309AEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AEV#TRPBF?
All LTC3309AEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AEV#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 LTC3309AEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309AEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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