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Analog Devices Inc. LTC3309AJV#TRMPBF
- Part No.:
- LTC3309AJV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AJV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:626
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Product details
Overview
LTC3309AJV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering 6A continuous output at up to 3MHz switching frequency, operating from 2.25V–5.5V input and regulating down to 0.5V with ±1% accuracy. It integrates 31mΩ PMOS and 8mΩ NMOS power switches, features Silent Switcher® architecture for ultralow EMI, and supports forced continuous, pulse-skip, or Burst Mode® operation-ideal for FPGA core supplies in automotive ADAS modules.
For engineers reviewing the LTC3309AJV#TRMPBF datasheet, LTC3309AJV#TRMPBF pinout, LTC3309AJV#TRMPBF application, or LTC3309AJV#TRMPBF equivalent, key selection criteria include its 22ns minimum on-time, AEC-Q100 qualification (–40°C to +150°C), 12-lead 2mm × 2mm LQFN package with exposed PGND pad, and programmable frequency via RT pin.
Technical Context
The LTC3309AJV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its 22ns minimum on-time supports high VIN-to-VOUT ratios (e.g., 5V→1.2V at 2MHz) while maintaining stable regulation under dynamic load steps.
Silent Switcher® architecture employs symmetrical layout and dual SW outputs to cancel magnetic fields, reducing radiated EMI by >30dB compared to conventional buck converters. The device supports clock synchronization (1–3MHz) and auto-adapts slope compensation when synchronized, preserving stability across frequency changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion or 3.3V/5V system rails. |
| IOUT Max | 6A continuous - sufficient for high-current FPGA, ASIC, or microprocessor core supplies. |
| fSW Range | 1MHz to 3MHz - allows optimization of size (higher fSW → smaller inductor/capacitor) vs. efficiency. |
| VOUT Accuracy | ±1% over temperature - ensures reliable voltage margining for sensitive digital loads. |
| tON,min | 22ns - supports high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse skipping. |
| Thermal Rating | Junction temp up to +150°C - qualified per AEC-Q100 for under-hood automotive applications. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on systems like telematics ECUs. |
Pinout & Package
The LTC3309AJV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with an exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 51°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 to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing with upstream regulators. |
| VIN (3,8) | Main input power supply | Dual pins reduce trace inductance and IR drop; bypass separately to PGND and AGND with low-ESR ceramics. |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path; requires ≥6 vias to inner/outer ground planes. |
| SW (5,6) | Switch node outputs | Dual SW pins reduce switching loop inductance; must be tied together and connected to inductor with short, wide copper. |
| MODE/SYNC (9) | Mode selection & sync input | Configures operation mode (low = pulse skip, float = forced continuous, high = Burst Mode) or accepts external 1–3MHz clock. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 1–3MHz; open or tied to VIN selects default 2MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output asserts high when VOUT is within –2%/+10% window; includes 120µs delay and OV/UV fault detection. |
| FB (12) | Feedback input | Regulates to 0.5V reference; 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, eliminating need for metal shielding in space-constrained automotive modules. |
| Burst Mode® operation | Delivers 40µA quiescent current at light loads while maintaining <10mVpp output ripple-critical for battery-backed memory retention. |
| 100% duty cycle capability | Enables dropout operation down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS, supporting brownout resilience in 12V automotive systems with local 5V rails. |
| Internal compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity-accelerates design validation for industrial PLCs. |
| AEC-Q100 Grade J | Qualified for –40°C to +150°C junction operation with full electrical characterization, enabling use in engine control units and radar front-ends. |
Applications
| Automotive ADAS Camera Module | FPGA Core Supply |
|---|---|
Use Scenario: Powering image sensor and FPGA in compact rear-view camera housing exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Primary 1.2V/6A POL regulator with fast transient response to handle burst-mode image capture current spikes. Use Value: Silent Switcher® EMI suppression avoids interference with 5GHz Wi-Fi/Bluetooth coexistence; AEC-Q100 J-grade ensures reliability at 150°C junction. | Use Scenario: Delivering clean, tightly regulated 0.85V core voltage to Xilinx Zynq UltraScale+ MPSoC in telecom baseband unit. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with programmable 2MHz switching to minimize inductor size while meeting tight ripple specs. Use Value: 22ns minimum on-time enables stable 5V→0.85V conversion; internal compensation reduces layout risk in dense RF-sensitive PCBs. |
| Industrial IoT Edge Controller | Optical Transceiver Module |
Use Scenario: Powering ARM Cortex-A53 SoC and isolated CAN/RS-485 PHY in DIN-rail mounted gateway operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Main 3.3V/6A supply with Burst Mode® for low-power sleep states and forced continuous mode during real-time data processing. Use Value: 40µA IQ extends battery backup runtime; 12-lead 2mm² LQFN fits constrained board area while exposed pad maintains thermal headroom. | Use Scenario: Generating 3.3V bias for 100G PAM4 optical driver ICs in compact QSFP-DD pluggable module with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise POL regulator synchronized to system clock to avoid beat frequencies in high-speed serial links. Use Value: MODE/SYNC pin enables 2.5GHz clock synchronization; ultralow EMI prevents jitter degradation in 56Gbaud NRZ signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546B24RVFT | 40V max VIN, 10A output, requires external compensation; no Burst Mode®; higher IQ (120µA) | Better suited for 12V/24V industrial inputs; lacks automotive temp grade and EMI-optimized layout | Select if input exceeds 5.5V or >6A output needed; avoid for EMI-sensitive or battery-critical designs. |
| MAX20406AATP/VY+ | 36V max VIN, 6A output, integrated FETs, 1.8MHz default fSW, 25ns tON,min, AEC-Q100 Grade 1 (–40°C to +125°C) | Higher VIN range but lower max junction temp; no Silent Switcher®; slightly higher typical RDS(ON) | Consider for cost-sensitive automotive infotainment where 150°C operation is not required. |
Compared with TPS546B24RVFT and MAX20406AATP/VY+, the LTC3309AJV#TRMPBF uniquely combines AEC-Q100 Grade J qualification, Silent Switcher® EMI reduction, 22ns minimum on-time, and 40µA Burst Mode® IQ-making it optimal for space- and noise-constrained automotive and optical networking POL applications.
Availability
LTC3309AJV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS, FPGA core supplies, and optical transceiver modules requiring stable component supply, extended temperature operation, and low EMI emissions.
Supply support for LTC3309AJV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3309A product line delivers ultra-small, high-efficiency, low-EMI synchronous buck regulators for space-constrained, noise-sensitive applications such as automotive radar, optical networking, and portable medical devices.
FAQ
What is the maximum junction temperature rating for the LTC3309AJV#TRMPBF?
The LTC3309AJV#TRMPBF is rated for operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive applications. This Grade J rating is confirmed in the Absolute Maximum Ratings table and applies specifically to the "J" suffix variant, distinguishing it from lower-temperature grades (E, I, H). Thermal derating above 125°C is required per Analog Devices' reliability guidelines.
Does the LTC3309AJV#TRMPBF support external clock synchronization?
Yes, the LTC3309AJV#TRMPBF supports external clock synchronization via the MODE/SYNC pin, accepting square-wave inputs from 1MHz to 3MHz. During synchronization, the device operates in forced continuous mode and automatically adapts slope compensation to maintain loop stability-enabling deterministic timing in multi-rail systems like 5G baseband units.
What is the purpose of the AGND pin on the LTC3309AJV#TRMPBF?
The AGND pin on the LTC3309AJV#TRMPBF 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 reject PCB trace resistance, ensuring accurate regulation. Bypassing AGND to VIN with a small ceramic capacitor minimizes noise coupling into the feedback path.
How does the LTC3309AJV#TRMPBF achieve ultralow EMI performance?
The LTC3309AJV#TRMPBF achieves ultralow EMI through its patented Silent Switcher® architecture, which uses symmetrical power switch layout and dual SW outputs to cancel magnetic field emissions. Measured radiated emissions are >30dB lower than conventional buck converters-verified in CISPR 25 Class 5 testing-eliminating the need for ferrite beads or metal shields in automotive and optical applications.
Can the LTC3309AJV#TRMPBF operate with 100% duty cycle?
Yes, the LTC3309AJV#TRMPBF supports up to 100% duty cycle operation, enabling dropout mode when VIN approaches VOUT. In this condition, the PMOS top switch remains fully on, and output voltage equals VIN minus IOUT × RDS(ON)_PMOS (31mΩ typ). This feature sustains regulation during brownout events in automotive 12V systems with local 5V rails.
LTC3309AJV#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC3309AJV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AJV#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 LTC3309AJV#TRMPBF reliable?
The price and inventory of LTC3309AJV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AJV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AJV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AJV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AJV#TRMPBF?
LTC3309AJV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AJV#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 LTC3309AJV#TRMPBF?
For technical support, including LTC3309AJV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AJV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309AJV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AJV#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 LTC3309AJV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AJV#TRMPBF?
All LTC3309AJV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AJV#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 LTC3309AJV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309AJV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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