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Analog Devices Inc. LTC3309AMPV#TRMPBF
- Part No.:
- LTC3309AMPV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AMPV#TRMPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC3309AMPV#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 down to 0.5V with ±1% feedback accuracy, featuring Silent Switcher® architecture for ultralow EMI emissions in automotive-grade thermal range (–55°C to +150°C) - used in FPGA core supplies and battery-powered POL systems.
For engineers reviewing the LTC3309AMPV#TRMPBF datasheet, LTC3309AMPV#TRMPBF pinout, LTC3309AMPV#TRMPBF application, or LTC3309AMPV#TRMPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1MHz–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode™ operation, and AEC-Q100-qualified 2mm × 2mm LQFN package with exposed PGND pad.
Technical Context
The LTC3309AMPV#TRMPBF employs constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its dual MOSFET power stage integrates a 31mΩ PMOS high-side switch and 8mΩ NMOS low-side switch, supporting up to 100% duty cycle for low-dropout operation.
Mode selection is controlled via the MODE/SYNC pin: grounded for pulse skip, floating for forced continuous, or tied to VIN for Burst Mode™ (40µA IQ). The RT pin programs switching frequency from 1MHz to 3MHz using an external resistor, while synchronization to an external 1MHz–3MHz clock is supported with automatic slope compensation adaptation.
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. |
| VOUT Range | 0.5V to VIN - enables direct regulation for sub-1V FPGA/ASIC cores. |
| Output Accuracy | ±1% over temperature - ensures stable voltage reference for precision logic supplies. |
| Min On-Time | 22ns - allows high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse skipping. |
| Switch RDS(ON) | 31mΩ (PMOS) / 8mΩ (NMOS) - minimizes conduction loss at 6A load, improving full-load efficiency. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on IoT edge nodes. |
| Thermal Range | –55°C to +150°C junction - qualified for under-hood automotive and industrial harsh environments. |
Pinout & Package
The LTC3309AMPV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), requiring soldering to PCB ground plane for optimal thermal resistance (θJA = 51°C/W) and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables sequencing with upstream regulators via resistor divider. |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; 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 ground plane for θJB = 12°C/W. |
| SW (5,6) | Switch node | High dv/dt node; must be routed short/wide to inductor to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode select & sync input | Configures light-load behavior (pulse skip/Burst/forced continuous) or accepts external 1–3MHz clock. |
| RT (10) | Frequency set resistor | Resistor to AGND sets fSW from 1–3MHz; open or tied to VIN defaults to ~2MHz. |
| PGOOD (11) | Open-drain status flag | Asserts high when VOUT is within –2%/+10% of target; includes 120µs delay and OV/UV hysteresis. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT to AGND for precise output programming. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for metal shielding cans. |
| Burst Mode™ operation | Delivers 90%+ efficiency at 1mA load with 40µA quiescent current - critical for battery longevity. |
| 100% duty cycle capability | Enables dropout operation down to VIN – VOUT ≈ 31mΩ × ILOAD, supporting ultra-low input scenarios. |
| Inductor saturation tolerance | Safe operation during overload without latch-off; valley current limiting prevents destructive reverse conduction. |
| AEC-Q100 qualification | Qualified to Grade MP (–55°C to +150°C), meeting automotive reliability requirements for engine control units. |
Applications
| Automotive ADAS Power Supply | FPGA Core Voltage Regulation |
|---|---|
|
Use Scenario: Powering image signal processors and radar SoCs in front-camera modules exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Primary 1.2V/6A POL regulator with fast load transient response and thermal robustness. Use Value: Maintains ±1% output accuracy across –40°C to +125°C ambient, preventing logic errors during thermal cycling. |
Use Scenario: Delivering clean, low-noise 0.85V core voltage to Xilinx Kintex-7 FPGAs in industrial PLCs. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with internal compensation and 22ns min on-time. Use Value: Enables use of compact 220nH inductors and eliminates external compensation network, reducing BOM count. |
| Battery-Powered Test Equipment | Optical Networking Line Cards |
|
Use Scenario: Portable oscilloscope front-end powering mixed-signal ADCs and amplifiers from Li-ion battery. IC Role / Device Role / Timing Role: Low-EMI, high-efficiency step-down converter with Burst Mode™ for standby operation. Use Value: Achieves 92% efficiency at 10mA load and <10mVpp output ripple, preserving signal integrity in analog sections. |
Use Scenario: Generating 3.3V/6A bias for SFP+ transceivers and SerDes PHYs in telecom line cards. IC Role / Device Role / Timing Role: Compact, high-density POL solution with synchronized switching to avoid beat frequencies. Use Value: Programmable 1–3MHz frequency allows alignment with system clock tree, minimizing spectral interference. |
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 |
|---|---|---|---|
| TPS546B24RVFT | 6A, 2.95–16V input, 0.6–5.5V output; uses D-CAP3 control, no Burst Mode™; 3.5mm × 3.5mm QFN. | Better suited for higher-input industrial rails; lacks automotive temp grade and Silent Switcher® EMI performance. | Choose TPS546B24RVFT if input exceeds 5.5V or if D-CAP3's zero-external-component design is preferred over fixed-frequency predictability. |
| MAX20404ATCA/VY+ | 6A, 2.7–5.5V input, 0.5–5.5V output; 2.5MHz default, 12-pin 2mm × 2mm FC2QFN; no AEC-Q100 rating. | Offers lower quiescent current (15µA) but unqualified for automotive; smaller footprint but no exposed thermal pad. | Choose MAX20404ATCA/VY+ for space-constrained consumer portables where AEC-Q100 is not required and lowest IQ dominates. |
Compared with TPS546B24RVFT and MAX20404ATCA/VY+, the LTC3309AMPV#TRMPBF uniquely combines AEC-Q100 MP-grade operation, Silent Switcher® EMI reduction, and 22ns minimum on-time in a 2mm × 2mm package - making it the only option qualified for automotive safety-critical POL where both thermal ruggedness and noise immunity are mandatory.
Availability
LTC3309AMPV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, FPGA-based industrial controllers, optical networking line cards, and battery-powered test equipment requiring stable component supply across extended temperature ranges.
Supply support for LTC3309AMPV#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 family delivers ultra-small, high-efficiency, low-EMI power conversion for space- and noise-sensitive applications including automotive infotainment, optical transceivers, and portable medical devices.
FAQ
What is the maximum junction temperature specification for the LTC3309AMPV#TRMPBF?
The LTC3309AMPV#TRMPBF is rated for a maximum junction temperature of +150°C and a minimum of –55°C, qualifying it as an AEC-Q100 MP-grade device. This extended range supports under-hood automotive deployment and high-ambient industrial environments. Thermal shutdown activates at ~165°C, with recovery at ~160°C. The package's θJA of 51°C/W requires careful PCB layout with the exposed PGND pad fully soldered to a thermal plane.
Does the LTC3309AMPV#TRMPBF support external clock synchronization, and what is the valid frequency range?
Yes, the LTC3309AMPV#TRMPBF supports external clock synchronization via the MODE/SYNC pin, accepting square-wave inputs from 1MHz to 3MHz. During synchronization, the device operates exclusively in forced continuous mode with automatically adapted slope compensation. The internal PLL locks to the external clock within microseconds, and detects clock removal within ~10µs, reverting to the RT-programmed frequency. This feature enables deterministic EMI management in dense multi-rail systems.
How does the LTC3309AMPV#TRMPBF achieve ultralow EMI, and is external filtering required?
The LTC3309AMPV#TRMPBF achieves ultralow EMI through Analog Devices' patented Silent Switcher® architecture, which integrates complementary power switches and symmetrical hot-loop layout to cancel magnetic fields. Measured radiated emissions are >30dB below CISPR 25 Class 5 limits without ferrite beads or metal shields. While external LC filters are optional for extreme compliance margins, the integrated design typically eliminates the need for additional filtering components in most automotive and industrial applications.
What protection features are built into the LTC3309AMPV#TRMPBF?
The LTC3309AMPV#TRMPBF integrates output overvoltage protection (OVP), short-circuit protection with valley current limiting, thermal shutdown, input undervoltage lockout (UVLO), and power-good monitoring. OVP triggers top-switch disable if FB exceeds 110% of target; short-circuit recovery uses soft-start restart after fault clearance; and PGOOD provides open-drain status with 120µs delay and hysteresis. These features ensure robust operation in unattended or safety-critical systems without external supervision circuitry.
Can the LTC3309AMPV#TRMPBF operate with a 2.25V input and deliver 1.2V at 6A?
Yes, the LTC3309AMPV#TRMPBF is explicitly specified to operate from 2.25V to 5.5V input and regulate down to 0.5V. At VIN = 2.25V and VOUT = 1.2V, the required duty cycle is ~53%, well within its 100% capability. Efficiency remains >85% at 6A load (per G26 curve), though RDS(ON) increases slightly at low VIN - thermal design must account for ~1.2W dissipation using the 8mΩ/31mΩ MOSFETs and θJA = 51°C/W.
LTC3309AMPV#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309AMPV#TRMPBF FAQ
1.How can I place an order for LTC3309AMPV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AMPV#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 LTC3309AMPV#TRMPBF reliable?
The price and inventory of LTC3309AMPV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AMPV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AMPV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AMPV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AMPV#TRMPBF?
LTC3309AMPV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AMPV#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 LTC3309AMPV#TRMPBF?
For technical support, including LTC3309AMPV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AMPV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309AMPV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AMPV#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 LTC3309AMPV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AMPV#TRMPBF?
All LTC3309AMPV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AMPV#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 LTC3309AMPV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309AMPV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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