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Analog Devices Inc. LTC3309AHV#TRMPBF
- Part No.:
- LTC3309AHV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AHV#TRMPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:856
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Product details
Overview
LTC3309AHV#TRMPBF 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 automotive infotainment power rails.
For engineers reviewing the LTC3309AHV#TRMPBF datasheet, LTC3309AHV#TRMPBF pinout, LTC3309AHV#TRMPBF application, or LTC3309AHV#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualified –40°C to +150°C junction temperature rating, 2mm × 2mm LQFN package with exposed PGND pad, programmable 1MHz–3MHz switching frequency, and integrated 31mΩ PMOS / 8mΩ NMOS power switches.
Technical Context
The LTC3309AHV#TRMPBF employs constant-frequency peak current mode control with internal compensation, enabling stable regulation without external loop components. Its architecture integrates slope compensation automatically adapted during external clock synchronization via MODE/SYNC, supporting seamless PLL-based frequency locking from 1MHz to 3MHz.
It implements three distinct light-load operating modes: forced continuous (fixed-frequency, reverse inductor current allowed), pulse-skip (clock-aligned, zero-reverse-current), and Burst Mode® (ultra-low IQ = 40µA, low-ripple sleep/wake cycling). Output overvoltage protection triggers at 110% VOUT with 2.2% hysteresis and 120µs delay, while thermal shutdown activates at ~165°C with 5°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and 3.3V/5V intermediate bus systems without pre-regulation. |
| VOUT Range & Accuracy | 0.5V to VIN, ±1% over temperature - enables precise core voltage regulation for ASICs and high-performance processors. |
| Max Output Current | 6A continuous - sufficient for FPGA I/O banks or dual-core microcontroller domains with margin. |
| Switching Frequency | Programmable 1MHz–3MHz via RT resistor or external SYNC - allows optimization of size (higher fSW) vs. efficiency (lower fSW). |
| Min On-Time | 22ns (typ.) - enables high step-down ratios (e.g., 5V→0.6V at 2MHz) without pulse skipping at light loads. |
| Quiescent Current | 40µA in Burst Mode® sleep - extends battery runtime in always-on automotive telematics modules. |
| Thermal Rating | Junction temp rated –40°C to +150°C (AEC-Q100 qualified) - validated for under-hood automotive environments. |
Pinout & Package
The LTC3309AHV#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) and EMI suppression.
| 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 50mV hysteresis; enables power-up sequencing when driven by upstream regulator output. |
| VIN (3,8) | Main input power supply | Dual pins reduce IR drop and inductance; require parallel short-wide traces and local ceramic bypass to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Primary return path for bottom switch; exposed pad (Pin 13) is mandatory thermal/electrical connection to large PCB ground plane. |
| SW (5,6) | Switch node output | High dv/dt node connecting internal FETs to inductor; must be routed as single low-inductance copper pour. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures light-load behavior (low = pulse-skip, float = forced continuous, high = Burst Mode®); accepts 1–3MHz external clock. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW; open or tied to VIN defaults to ~2MHz; ignored during external clock sync. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% window; pulled low during UVLO, shutdown, or OV fault. |
| FB (12) | Feedback input | Senses 0.5V reference; connects to resistor divider from VOUT to AGND to set output voltage; supports optional phase-lead compensation. |
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. |
| Low-ripple Burst Mode® operation | Maintains <10mVpp output ripple at light loads while achieving 40µA quiescent current - critical for noise-sensitive RF and sensor subsystems. |
| 100% duty cycle capability | Enables dropout operation down to VOUT ≈ VIN − (IOUT × RDS(ON)_PMOS), supporting brownout resilience in 12V-to-5V POL applications. |
| Integrated power switches | 31mΩ PMOS top switch + 8mΩ NMOS bottom switch minimize conduction loss and eliminate external MOSFET layout complexity. |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood use with guaranteed operation from –40°C to +150°C junction temperature and robust ESD/EMI immunity. |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
Use Scenario: Powering SoC and display interface circuitry in head-unit systems exposed to engine bay thermal transients. IC Role / Device Role / Timing Role: Primary 1.2V/6A POL regulator delivering clean, low-noise voltage with fast load-step response to handle video frame bursts. Use Value: AEC-Q100 H-grade operation ensures reliability at 150°C junction; Silent Switcher® meets CISPR-25 Class 5 radiated emissions limits without shield cans. |
Use Scenario: Generating configurable core voltage (0.75V–1.2V) for Xilinx Artix-7 or Intel Cyclone V FPGA domains with dynamic VCCINT scaling. IC Role / Device Role / Timing Role: High-accuracy, fast-transient buck converter with internal compensation and 22ns min on-time for tight voltage margins. Use Value: ±1% VFB accuracy and 0.5V reference enable sub-10mV regulation tolerance; programmable fSW allows trade-off between inductor size and efficiency. |
| Optical Networking Line Cards | Battery-Powered Test Equipment |
Use Scenario: Providing isolated 3.3V/6A bias for laser diode drivers and transimpedance amplifiers in 10G/25G SFP+ modules. IC Role / Device Role / Timing Role: High-efficiency, low-EMI point-of-load converter operating from 5V backplane with minimal board area footprint. Use Value: 2mm × 2mm LQFN package saves >60% PCB area vs. comparable 3mm × 3mm solutions; Burst Mode® extends module standby time. |
Use Scenario: Powering portable oscilloscope front-end ADCs and FPGA logic where battery life and signal integrity are co-critical. IC Role / Device Role / Timing Role: Ultra-low-noise, low-IQ DC/DC regulator supplying 1.8V/6A to mixed-signal processing chain with minimal conducted EMI. Use Value: 40µA Burst Mode® IQ doubles battery runtime vs. forced continuous mode; integrated soft-start prevents input rail sag during wake-up. |
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 max output, 2MHz fixed fSW, no Burst Mode®, 40V max VIN, SOIC-8 package | Lacks AEC-Q100 qualification, higher RDS(ON), no programmable frequency or remote sensing | Select only for cost-sensitive industrial non-automotive designs where 3A output suffices and EMI is less critical. |
| TPS546B24RVFT | 12A output, 4.5–18V VIN, 3.3mm × 3.3mm QFN, digital PMBus interface, no Silent Switcher | Higher VIN range and current, but larger footprint, higher IQ (120µA), and requires external compensation | Prefer for high-power server POL where digital telemetry and wider input range outweigh EMI and size constraints. |
Compared with MP2451DT-LF-Z and TPS546B24RVFT, the LTC3309AHV#TRMPBF uniquely combines AEC-Q100 H-grade reliability, 2mm × 2mm footprint, Silent Switcher® EMI performance, and 40µA Burst Mode® IQ - making it the only choice for space- and noise-constrained automotive or portable test equipment demanding 6A at ≤5.5V input.
Availability
LTC3309AHV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, optical networking line cards, and battery-powered test equipment requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LTC3309AHV#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 with precision power, signal chain, and RF solutions.
The LTC3309A product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck regulators targeting space-constrained and noise-sensitive applications such as automotive ADAS, optical transceivers, and portable instrumentation - emphasizing integration, thermal robustness, and AEC-Q100 compliance.
FAQ
What is the maximum junction temperature rating for the LTC3309AHV#TRMPBF?
The LTC3309AHV#TRMPBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade H applications. This specification is guaranteed per Analog Devices' characterization and statistical process controls, with thermal shutdown engaging at approximately 165°C to protect the device during overload conditions.
Does the LTC3309AHV#TRMPBF support external clock synchronization?
Yes, the LTC3309AHV#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 slope compensation is automatically adapted to the external frequency - enabling deterministic timing in multi-rail systems.
What is the purpose of the AGND pin on the LTC3309AHV#TRMPBF?
The AGND pin on the LTC3309AHV#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 ensure accurate regulation, and all FB and RT return paths should tie to AGND-not PGND-to avoid noise coupling into the feedback loop.
How does the LTC3309AHV#TRMPBF achieve low EMI performance?
The LTC3309AHV#TRMPBF achieves low EMI through its proprietary Silent Switcher® architecture, which minimizes magnetic field radiation by using symmetrical, opposing hot-loop layouts and integrated input capacitors. This design reduces peak radiated emissions by >30dB versus conventional buck converters, meeting stringent CISPR-25 Class 5 requirements without added shielding.
Can the LTC3309AHV#TRMPBF operate in 100% duty cycle mode?
Yes, the LTC3309AHV#TRMPBF supports up to 100% duty cycle operation, allowing it to maintain regulation as VIN approaches VOUT. In dropout, the output voltage equals VIN minus the voltage drop across the internal PMOS switch (IOUT × RDS(ON)_PMOS) and inductor DCR - enabling reliable operation during input brownouts in automotive and industrial systems.
LTC3309AHV#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309AHV#TRMPBF FAQ
1.How can I place an order for LTC3309AHV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AHV#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 LTC3309AHV#TRMPBF reliable?
The price and inventory of LTC3309AHV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AHV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AHV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AHV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AHV#TRMPBF?
LTC3309AHV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AHV#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 LTC3309AHV#TRMPBF?
For technical support, including LTC3309AHV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AHV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309AHV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AHV#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 LTC3309AHV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AHV#TRMPBF?
All LTC3309AHV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AHV#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 LTC3309AHV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309AHV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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