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Analog Devices Inc. LTC3309AIV#TRPBF
- Part No.:
- LTC3309AIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AIV#TRPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,645
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Product details
Overview
LTC3309AIV#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-ideal for FPGA core supplies in space-constrained telecom and automotive systems.
For engineers reviewing the LTC3309AIV#TRPBF datasheet, LTC3309AIV#TRPBF pinout, LTC3309AIV#TRPBF application, or LTC3309AIV#TRPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode operation, and thermally enhanced 2mm × 2mm LQFN package with exposed PGND pad.
Technical Context
The LTC3309AIV#TRPBF uses constant-frequency peak current mode control with internal compensation and supports three selectable operating modes via the MODE/SYNC pin: forced continuous (floating), pulse skip (grounded), or Burst Mode (tied to VIN). Its 8mΩ NMOS and 31mΩ PMOS integrated power switches enable high efficiency across load ranges.
It features a precision 400mV enable threshold with hysteresis, 120µs PGOOD delay with ±1.2%/±2.2% hysteresis thresholds, and robust protection including output overvoltage detection at 107–114% VOUT, thermal shutdown at ~165°C, and valley-current limiting to prevent inductor saturation during overload.
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 external LDO pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct regulation of sub-1V FPGA/ASIC cores with no external resistive divider scaling. |
| Output Accuracy | ±1% over temperature - ensures stable voltage margining for sensitive digital loads under thermal stress. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-driven) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Minimum On-Time | 22ns (typ) - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping or instability. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on IoT and automotive infotainment modules. |
| Thermal Rating | –40°C to +125°C junction - qualified for industrial and automotive under-hood applications per AEC-Q100 (I-grade). |
Pinout & Package
The LTC3309AIV#TRPBF 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 when driven by upstream regulator output. |
| VIN (3,8) | Main input power supply | Dual pins reduce trace inductance and IR drop; require parallel low-ESR ceramic bypassing to PGND and AGND. |
| PGND (4,7,13) | Power ground return | Primary return path for bottom switch; exposed pad (13) must be soldered to large PCB ground plane with multiple vias. |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to inductor; requires short, wide copper pour to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode select / clock sync | Configures operation mode (pulse skip/forced continuous/Burst) or accepts 1–3MHz external clock for system synchronization. |
| RT (10) | Frequency set resistor | Resistor to AGND sets switching frequency; open or tied to VIN selects default ~2MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output pulled low if VOUT falls below 97% or rises above 109% of target, or during EN/VIN fault. |
| FB (12) | Feedback input | Regulates VOUT by holding voltage at 500mV; connects to resistor divider between VOUT and AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Minimizes high-frequency EMI emissions via symmetrical layout and integrated hot-loop capacitors-reduces need for shielding or complex filtering in EMC-sensitive designs. |
| Low-ripple Burst Mode® operation | Delivers 40µA IQ at light loads while maintaining <10mVpp output ripple-enables clean power for RF and analog subsystems without sacrificing battery life. |
| 100% duty cycle capability | Supports dropout operation down to VOUT = VIN − (IPK × RDS(ON)_PMOS) - maintains regulation during brownout or low-VIN conditions in portable systems. |
| Internal compensation | Eliminates external compensation components - reduces BOM count and layout sensitivity while ensuring stability across all output capacitors and loads. |
| AEC-Q100 qualified (I-grade) | Validated for automotive applications at –40°C to +125°C junction temperature - meets reliability and qualification requirements for ADAS and infotainment ECUs. |
Applications
| FPGA Core Supply | Automotive Infotainment SoC |
|---|---|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA core rails requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.2V/6A with <100µs load-step recovery and <±1% regulation. Use Value: 22ns minimum on-time enables stable 1.2V output from 3.3V input at 2MHz, reducing inductor size by 40% versus legacy solutions. | Use Scenario: Supplying 0.85V core voltage to NXP i.MX8M Plus SoC in head-unit systems with strict automotive EMC limits. IC Role / Device Role / Timing Role: Low-noise POL converter operating in Burst Mode during standby and forced continuous during video decode bursts. Use Value: Silent Switcher architecture achieves CISPR-25 Class 5 compliance without ferrite beads, saving board area and cost. |
| Optical Network Line Card | Battery-Powered Test Equipment |
Use Scenario: Generating 1.8V/4A for DSP and SerDes ICs on compact 1RU line cards with limited airflow. IC Role / Device Role / Timing Role: High-efficiency step-down regulator synchronized to system clock via MODE/SYNC pin to avoid beat frequencies. Use Value: 1–3MHz programmable frequency allows alignment with 2.5GHz SerDes reference clocks, eliminating spectral interference in jitter-sensitive links. | Use Scenario: Powering handheld oscilloscope front-end ADCs and FPGA logic from dual-cell Li-ion (6.4–8.4V) via intermediate 3.3V rail. IC Role / Device Role / Timing Role: Intermediate bus converter operating from 5V input (buck-boost derived) to supply 1.2V/6A digital core. Use Value: 40µA Burst Mode IQ extends battery life to >12 hours in sleep mode while enabling instant wake-up without soft-start delay. |
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 |
|---|---|---|---|
| TPS546B24RVFT | Higher 12A rating, 3.5V–18V input, requires external compensation, larger 4mm × 4mm QFN package. | Better suited for higher-power server POL where input voltage exceeds 5.5V and layout space permits larger footprint. | Select TPS546B24RVFT only when >6A output or >5.5V input is required; LTC3309AIV#TRPBF offers superior EMI and smaller size for ≤6A, ≤5.5V applications. |
| MP28164GQVA-LF-Z | 6A rating, 2.7V–16V input, fixed 2.1MHz frequency, no MODE/SYNC pin, lower 50µA IQ in light-load mode. | Targeted at cost-sensitive industrial HMIs; lacks Burst Mode low-noise benefit and AEC-Q100 qualification. | Choose MP28164GQVA-LF-Z for non-automotive, non-EMI-critical applications where fixed frequency and lower BOM cost outweigh noise and qualification needs. |
Compared with TPS546B24RVFT and MP28164GQVA-LF-Z, the LTC3309AIV#TRPBF uniquely combines AEC-Q100 I-grade qualification, Silent Switcher EMI reduction, and 22ns minimum on-time in a 2mm × 2mm footprint-making it the optimal choice for space-constrained, noise-sensitive, and automotive-qualified 6A POL designs.
Availability
LTC3309AIV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive infotainment SoCs, and optical network line cards requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3309AIV#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, industrial, automotive, and communications markets.
The LTC3309AIV#TRPBF belongs to the LTC® monolithic DC/DC converter product line, engineered for ultra-small-footprint, low-EMI, high-efficiency point-of-load regulation in demanding applications such as optical networking, automotive ADAS, and high-density computing.
FAQ
What is the maximum continuous output current of the LTC3309AIV#TRPBF?
The LTC3309AIV#TRPBF delivers up to 6A continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB, 2cm² copper). Derating applies at elevated ambient temperatures or reduced airflow; full 6A is sustained at TJ ≤ 125°C with proper thermal design using the exposed PGND pad.
Does the LTC3309AIV#TRPBF support external frequency synchronization?
Yes, the LTC3309AIV#TRPBF supports external clock synchronization via the MODE/SYNC pin. Applying a 1MHz–3MHz square wave to this pin locks the internal oscillator to the external source while automatically adapting slope compensation-ensuring stable operation without phase jitter or beat frequencies.
What protection features are integrated into the LTC3309AIV#TRPBF?
The LTC3309AIV#TRPBF integrates output overvoltage protection (trip at 107–114% VOUT), thermal shutdown (~165°C), short-circuit protection via valley-current limiting, and input UVLO with 150mV hysteresis. It also provides PGOOD monitoring with 120µs delay and built-in hysteresis to reject noise-induced false triggers.
Can the LTC3309AIV#TRPBF operate with a 2.25V input supply?
Yes, the LTC3309AIV#TRPBF operates down to 2.25V input. At this minimum VIN, the internal PMOS RDS(ON) increases, so thermal design must account for higher conduction loss. The 22ns minimum on-time ensures stable regulation even at extreme step-down ratios (e.g., 2.25V → 0.5V).
Is the LTC3309AIV#TRPBF pin-compatible with other members of the LTC330x family?
No, the LTC3309AIV#TRPBF is not pin-compatible with LTC3307 (3A) or LTC3308 (4A), though it shares functional similarity and package footprint. Its 12-pin LQFN layout differs in pin assignment (e.g., dual SW and VIN pins, dedicated AGND), requiring unique PCB layout-verified in the official pin configuration diagram.
LTC3309AIV#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)
LTC3309AIV#TRPBF FAQ
1.How can I place an order for LTC3309AIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AIV#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 LTC3309AIV#TRPBF reliable?
The price and inventory of LTC3309AIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AIV#TRPBF?
LTC3309AIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AIV#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 LTC3309AIV#TRPBF?
For technical support, including LTC3309AIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AIV#TRPBF requirements.
6.How does Aetrix verify that LTC3309AIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AIV#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 LTC3309AIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AIV#TRPBF?
All LTC3309AIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AIV#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 LTC3309AIV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309AIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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