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Analog Devices Inc. LTC3309AJV#TRPBF
- Part No.:
- LTC3309AJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AJV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,285
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Product details
Overview
LTC3309AJV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A continuous output current, operating from 2.25V to 5.5V input, regulating down to 0.5V with ±1% feedback accuracy, and featuring Silent Switcher® architecture for ultralow EMI in automotive-grade (–40°C to +150°C) 2mm × 2mm LQFN packaging.
For engineers reviewing the LTC3309AJV#TRPBF datasheet, LTC3309AJV#TRPBF pinout, LTC3309AJV#TRPBF application, or LTC3309AJV#TRPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1MHz–3MHz switching frequency, Burst Mode® operation with 40µA quiescent current, and AEC-Q100 qualification for under-hood automotive power rails.
Technical Context
The LTC3309AJV#TRPBF employs constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation across wide load and input ranges. 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.
Three selectable operating modes-forced continuous, pulse skip, and low-ripple Burst Mode®-are configured via the MODE/SYNC pin, while external RT resistor programming or SYNC clock input enables precise frequency control from 1MHz to 3MHz. The device includes comprehensive protection: output overvoltage (107–114% VOUT), short-circuit valley-current limiting (7.8A), thermal shutdown at 165°C, and precision enable threshold (400mV ±50mV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and automotive 3.3V/5V rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct core supply for modern FPGAs, ASICs, and microprocessors requiring sub-1V rails. |
| Output Accuracy | ±1% over temperature - ensures stable voltage regulation across –40°C to +150°C junction range. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-synchronized) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) with practical inductor values and avoids sub-harmonic instability. |
| Quiescent Current | 40µA in Burst Mode® sleep - extends battery life in always-on automotive sensors and telematics modules. |
| Thermal Rating | Junction temp rated to +150°C - qualified per AEC-Q100 Grade 1, suitable for engine control units and ADAS domain controllers. |
Pinout & Package
The LTC3309AJV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) soldered directly to PCB ground plane for low θJA (51°C/W) and robust thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to output capacitor negative terminal at load for accurate regulation. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables event-driven power sequencing with external resistor divider. |
| VIN (3, 8) | Main input power supply | Dual pins reduce IR drop and inductance; require parallel short-wide traces and local ceramic bypass to AGND/PGND. |
| PGND (4, 7, 13) | Power ground return | Primary return path for bottom switch and thermal conduction; exposed pad (13) must be connected to large PCB ground plane with multiple vias. |
| SW (5, 6) | Switch node | High dv/dt node connecting internal MOSFETs to external inductor; requires minimal trace area to suppress EMI. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures Burst/Pulse Skip/Forced Continuous modes; accepts 1–3MHz external clock for system-level timing synchronization. |
| RT (10) | Frequency set resistor | Connects to AGND with precision resistor (e.g., 34.8kΩ for 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% window; includes 120µs delay and hysteresis for noise immunity. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider between VOUT and AGND to set output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB compared to conventional buck converters, eliminating need for metal shielding in space-constrained automotive modules. |
| Burst Mode® operation | Delivers 90%+ efficiency at 1mA load with only 40µA IQ, enabling always-on functionality in low-power ADAS camera systems. |
| 100% duty cycle capability | Supports dropout operation down to VOUT = VIN − (IOUT × RDS(ON)_PMOS), critical for cold-crank automotive scenarios where VIN dips to 2.25V. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with extended reliability testing, meeting functional safety requirements for ASIL-B automotive subsystems. |
| Internal compensation | Eliminates external compensation components, reducing BOM count and layout sensitivity while maintaining stability across all operating conditions. |
Applications
| Automotive Engine Control Unit (ECU) | FPGA Core Power Supply |
|---|---|
Use Scenario: Regulating 3.3V or 5V battery rail to 1.0V/1.2V for MCU and sensor interface logic in under-hood ECUs exposed to 150°C ambient. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing clean, low-noise, thermally robust core voltage with fast transient response to CPU load steps. Use Value: AEC-Q100 qualification and 150°C junction rating ensure reliable operation during prolonged high-temperature soak; Silent Switcher® meets CISPR-25 Class 5 EMI limits. |
Use Scenario: Delivering tightly regulated 0.85V–1.2V at up to 6A to Xilinx or Intel FPGA core banks in telecom baseband cards. IC Role / Device Role / Timing Role: High-current POL converter with <22ns min on-time enabling high-frequency, low-inductance design for rapid load-step response. Use Value: ±1% output accuracy and internal compensation guarantee stable voltage under dynamic logic switching; 2mm × 2mm footprint saves board space in dense FPGA carrier designs. |
| Optical Network Line Card | Industrial IoT Edge Controller |
Use Scenario: Generating 1.8V/2.5V/3.3V rails from 5V backplane for transceiver ASICs and SerDes interfaces in compact optical modules. IC Role / Device Role / Timing Role: Low-EMI point-of-load regulator synchronized to system clock via MODE/SYNC pin to avoid beat frequencies in high-speed data links. Use Value: 1–3MHz programmable frequency allows EMI notch placement away from critical data bands; Burst Mode® extends uptime in remote fiber nodes powered by small batteries. |
Use Scenario: Powering ARM Cortex-M7-based edge AI processors and wireless SoCs (Wi-Fi 6/Bluetooth 5) in sealed industrial gateways operating at 85°C ambient. IC Role / Device Role / Timing Role: Efficient, thermally resilient DC/DC converter supporting wide VIN range (2.25–5.5V) to accommodate supercapacitor backup and USB-C input. Use Value: 40µA quiescent current in Burst Mode® minimizes self-discharge during deep sleep; PGOD and OVP provide fault resilience in unattended deployments. |
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 | 3A output, 2MHz fixed frequency, no Burst Mode®, lower thermal rating (–40°C to +125°C), no AEC-Q100 qualification. | Targeted at cost-sensitive industrial and consumer applications; lacks automotive reliability and low-IQ operation. | Choose for non-automotive, lower-current designs where EMI and ultra-low IQ are not critical. |
| TPS546B24RVFT | 6A, 4.5–18V input, digital PMBus interface, higher quiescent current (120µA), larger 4mm × 4mm QFN package. | Designed for server and telecom systems requiring telemetry, margining, and multi-rail coordination via PMBus. | Choose when digital control, input voltage >5.5V, or system-level power management is required. |
Compared with MP2451DT-LF-Z and TPS546B24RVFT, the LTC3309AJV#TRPBF uniquely combines AEC-Q100 qualification, 40µA Burst Mode® IQ, Silent Switcher® EMI performance, and 2mm × 2mm footprint - making it optimal for space- and noise-constrained automotive and portable industrial power rails.
Availability
LTC3309AJV#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, FPGA core supplies, optical network line cards, and industrial IoT edge controllers requiring stable component supply with full AEC-Q100 compliance and long-term lifecycle support.
Supply support for LTC3309AJV#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 automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LTC3309A product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck regulators optimized for automotive-grade reliability and next-generation FPGA/microprocessor core power in space-constrained environments.
FAQ
What is the maximum junction temperature rating for the LTC3309AJV#TRPBF?
The LTC3309AJV#TRPBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade 1. This rating is confirmed in the Absolute Maximum Ratings table and applies specifically to the "J" grade variant, distinguishing it from the "E" and "I" grades rated to +125°C. Thermal derating above 125°C is required per Analog Devices' high-temperature guidelines.
Does the LTC3309AJV#TRPBF support external clock synchronization?
Yes, the LTC3309AJV#TRPBF supports external clock synchronization via the MODE/SYNC pin, accepting square-wave inputs from 1MHz to 3MHz. When synchronized, the device operates in forced continuous mode with automatic slope compensation adaptation. The RT pin is ignored during synchronization, and the internal PLL locks to the external clock within microseconds.
What is the purpose of the AGND pin on the LTC3309AJV#TRPBF?
The AGND pin on the LTC3309AJV#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 to ensure accurate regulation, especially under high-current or high-PCB-impedance conditions. Bypass capacitors should be placed between AGND and VIN pins.
How does the LTC3309AJV#TRPBF achieve low EMI performance?
The LTC3309AJV#TRPBF achieves low EMI through its patented Silent Switcher® architecture, which uses symmetrical layout and integrated bypass capacitors to cancel magnetic field emissions. Measured radiated emissions are >30dB lower than conventional buck converters, enabling compliance with CISPR-25 Class 5 without additional shielding or ferrites in automotive applications.
Can the LTC3309AJV#TRPBF operate with a 2.25V input supply?
Yes, the LTC3309AJV#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, it maintains regulation down to 0.5V output with full 6A capability, though power dissipation increases due to higher RDS(ON) of internal MOSFETs. Thermal design must account for worst-case junction temperature under these low-VIN, high-IOUT conditions.
LTC3309AJV#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:
- 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:
- 6A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309AJV#TRPBF FAQ
1.How can I place an order for LTC3309AJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AJV#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 LTC3309AJV#TRPBF reliable?
The price and inventory of LTC3309AJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AJV#TRPBF?
LTC3309AJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AJV#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 LTC3309AJV#TRPBF?
For technical support, including LTC3309AJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AJV#TRPBF requirements.
6.How does Aetrix verify that LTC3309AJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AJV#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 LTC3309AJV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AJV#TRPBF?
All LTC3309AJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AJV#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 LTC3309AJV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309AJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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