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Analog Devices Inc. LTC3309AIV#TRMPBF
- Part No.:
- LTC3309AIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AIV#TRMPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,604
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Product details
Overview
LTC3309AIV#TRMPBF 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 output voltages as low as 0.5V with ±1% accuracy over temperature, and featuring Silent Switcher® architecture for ultralow EMI in optical networking and FPGA core supply applications.
For engineers reviewing the LTC3309AIV#TRMPBF datasheet, LTC3309AIV#TRMPBF pinout, LTC3309AIV#TRMPBF application, or LTC3309AIV#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and switching performance, and real-world mode-selection trade-offs between Burst Mode (40µA IQ), pulse skip, and forced continuous operation.
Technical Context
The LTC3309AIV#TRMPBF uses constant-frequency peak current mode control with programmable 1MHz–3MHz switching via RT resistor or external SYNC clock, enabling fast transient response with 22ns minimum on-time and full 100% duty cycle capability for low-dropout operation. Its dual-power-switch architecture integrates 31mΩ PMOS and 8mΩ NMOS FETs with forward/reverse current limiting and internal compensation.
It supports three selectable operating modes via MODE/SYNC pin: forced continuous (fixed frequency, lowest ripple), pulse skip (light-load efficiency with aligned edges), and Burst Mode® (40µA quiescent current, low-ripple sleep/wake cycles). Power good monitoring includes ±2%/+10% window with 120µs delay and hysteresis, while overvoltage protection triggers at 110% VOUT with automatic top-FET shutdown.
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 for transient peaks. |
| VOUT Accuracy | ±1% over temperature - ensures stable logic-level compliance across –40°C to +125°C junction range. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-synchronized) - enables compact 220nH inductors and small ceramic capacitors. |
| Min On-Time | 22ns - allows 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 life in always-on IoT or portable systems. |
| Thermal Rating | Junction temp rated –40°C to +125°C (I-grade) - qualified for industrial and automotive under-hood environments. |
Pinout & Package
The LTC3309AIV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal resistance (θJB = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to load-side capacitor negative terminal to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with 50mV hysteresis; enables power-up sequencing when tied to upstream regulator output. |
| VIN (3,8) | Main input power supply | Dual pins reduce trace inductance; require parallel low-ESR bypass capacitors to both AGND and PGND. |
| 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 selection & clock sync | GND = pulse skip; VIN = Burst Mode; float = forced continuous; driven by external clock = synchronized forced continuous. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 1–3MHz; open or tied to VIN selects default ~2MHz oscillator. |
| PGOOD (11) | Power status indicator | Open-drain output pulled low if VOUT outside –2%/+10% window, during EN low, UVLO, or thermal shutdown. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider from VOUT to AGND to set output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB vs conventional buck converters-enables compliance with CISPR 22 Class B without shielding. |
| Burst Mode® operation | 40µA IQ at light loads with low-output-ripple sleep/wake cycles-ideal for battery-powered systems needing >100h standby. |
| 100% duty cycle capability | Supports dropout operation down to VIN ≈ VOUT + IOUT × RDS(ON)_PMOS-maintains regulation during brownout conditions. |
| Internal compensation | Eliminates need for external Type II/III compensation network-reduces BOM count and layout sensitivity. |
| Robust protection suite | Includes output overvoltage lockout (110% VOUT), thermal shutdown (165°C), short-circuit recovery, and reverse inductor current limiting. |
Applications
| Optical Networking Line Cards | FPGA Core Power Supply |
|---|---|
|
Use Scenario: Providing clean, low-noise 1.2V/6A power to high-speed SerDes transceivers in 100G/400G line cards where EMI must meet strict telecom standards. IC Role / Device Role / Timing Role: Primary point-of-load regulator with Silent Switcher® EMI suppression and fast transient response to handle bursty data traffic loads. Use Value: Enables direct placement near SerDes ICs without ferrite beads or shielded inductors-reducing board area by ≥30% vs legacy solutions. |
Use Scenario: Delivering tightly regulated 0.85V–1.2V core voltage to Xilinx Kintex or Intel Stratix FPGAs with dynamic current demands up to 6A. IC Role / Device Role / Timing Role: Monolithic synchronous buck converter with internal compensation and 22ns min on-time for high step-down ratio stability. Use Value: Achieves <1% VOUT deviation during 4A/µs load steps-prevents timing violations and logic errors in high-frequency fabric operation. |
| 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 Grade I (–40°C to +125°C) reliability. IC Role / Device Role / Timing Role: High-efficiency POL regulator with Burst Mode® for low-quiescent operation during vehicle sleep mode. Use Value: Maintains 40µA IQ in sleep while surviving 150°C junction peaks during engine-off hot soak-meeting ISO 16750-4 requirements. |
Use Scenario: Generating isolated 3.3V/5V rails for microcontroller and analog front-end circuits in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Input-supply-tolerant buck converter supporting wide 2.25–5.5V input from industrial 3.3V/5V backplanes. Use Value: Delivers 6A output with <1.5% line/load regulation across 40–85°C ambient-ensuring deterministic ADC sampling and UART timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546B24A | 6A, 2.95–16V input, 0.6–5.5V output, 3.3mΩ/1.8mΩ FETs, requires external compensation | Higher VIN range suits 12V intermediate bus; lacks Silent Switcher EMI reduction and integrated soft-start | Choose for higher-input industrial systems where layout space allows external compensation components. |
| MP2964GQ | 6A, 2.7–16V input, 0.6–5.5V output, 4.5mΩ/2.2mΩ FETs, 1.2MHz fixed frequency, no Burst Mode | No low-IQ light-load mode; lower EMI performance; smaller package but no exposed thermal pad | Choose for cost-sensitive applications where 40µA IQ and CISPR-compliant EMI are not required. |
Compared with TPS546B24A and MP2964GQ, the LTC3309AIV#TRMPBF delivers superior EMI performance via Silent Switcher®, lower light-load IQ (40µA), and internal compensation-making it optimal for space-constrained, noise-sensitive, and battery-backed designs despite its narrower 2.25–5.5V input range.
Availability
LTC3309AIV#TRMPBF is available at Aetrix Electronics and suitable for optical networking line cards, FPGA core supplies, and automotive ADAS domain controllers requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LTC3309AIV#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 precision instrumentation, communications, and industrial markets since 1965.
The LTC3309A belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC converters, engineered for ultra-small footprint, low EMI, and high efficiency in demanding point-of-load applications including FPGA, ASIC, and optical infrastructure.
FAQ
What is the maximum junction temperature rating for the LTC3309AIV#TRMPBF?
The LTC3309AIV#TRMPBF is rated for operation from –40°C to +125°C junction temperature (I-grade). It incorporates overtemperature protection that disables switching above ~165°C and resumes operation once die temperature falls to ~160°C. This rating aligns with industrial and automotive under-hood requirements where sustained high ambient temperatures occur.
How does the MODE/SYNC pin configure operating modes on the LTC3309AIV#TRMPBF?
The MODE/SYNC pin on the LTC3309AIV#TRMPBF selects among three modes: grounded for pulse skip, tied to VIN for Burst Mode® (40µA IQ), or left floating for forced continuous conduction. When driven by an external 1–3MHz square wave, it synchronizes the internal oscillator while enforcing forced continuous mode-enabling deterministic EMI filtering and multi-phase coordination.
Can the LTC3309AIV#TRMPBF operate with input voltage below 2.5V?
Yes, the LTC3309AIV#TRMPBF supports input voltages as low as 2.25V. At such low VIN, RDS(ON) of the internal PMOS increases, raising conduction loss; design validation must confirm junction temperature remains within –40°C to +125°C limits using θJA = 51°C/W and measured power dissipation. The 100% duty cycle capability maintains regulation even as VIN approaches VOUT.
What is the purpose of the AGND pin on the LTC3309AIV#TRMPBF, and how should it be routed?
The AGND pin on the LTC3309AIV#TRMPBF serves as the remote output voltage sense reference and analog ground for internal circuitry. It must be connected directly to the negative terminal of the output capacitor at the load-not to the local PGND plane-to reject PCB trace resistance and ensure accurate regulation. A dedicated 0201/0402 ceramic bypass capacitor between VIN and AGND is mandatory.
Does the LTC3309AIV#TRMPBF support external frequency synchronization, and what is the valid range?
Yes, the LTC3309AIV#TRMPBF supports external synchronization via the MODE/SYNC pin across 1MHz to 3MHz. During synchronization, it operates in forced continuous mode with automatic slope compensation adaptation. The PLL locks within microseconds and detects clock removal within ~10µs, then seamlessly reverts to RT-set frequency-enabling precise EMI frequency placement and multi-converter phase alignment.
LTC3309AIV#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC3309AIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AIV#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 LTC3309AIV#TRMPBF reliable?
The price and inventory of LTC3309AIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AIV#TRMPBF?
LTC3309AIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AIV#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 LTC3309AIV#TRMPBF?
For technical support, including LTC3309AIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309AIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AIV#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 LTC3309AIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AIV#TRMPBF?
All LTC3309AIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AIV#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 LTC3309AIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309AIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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