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Analog Devices Inc. LTC3309BMPV#TRPBF
- Part No.:
- LTC3309BMPV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BMPV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3309BMPV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output current, operating from 2.25V–5.5V input and regulating down to 0.5V with ±1% accuracy. It uses peak current mode control at 3MHz–10MHz, features 22ns minimum on-time, Silent Switcher architecture for ultralow EMI, and supports forced continuous, pulse-skip, or Burst Mode operation - ideal for space-constrained, noise-sensitive automotive and industrial POL applications.
For engineers reviewing the LTC3309BMPV#TRPBF datasheet, LTC3309BMPV#TRPBF pinout, LTC3309BMPV#TRPBF application, or LTC3309BMPV#TRPBF equivalent, key selection considerations include its –55°C to +150°C extended temperature grade, 12-lead 2mm × 2mm LQFN package with exposed PGND pad, 8mΩ NMOS / 31mΩ PMOS RDS(ON), 40µA quiescent current in Burst Mode, and AEC-Q100 qualification for automotive use.
Technical Context
The LTC3309BMPV#TRPBF implements 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/VOUT ratios (e.g., 5.5V→0.5V at 6.6MHz), while slope-compensated PWM ensures stability across all load modes.
Silent Switcher architecture employs symmetrical layout and integrated bypass capacitors to suppress common-mode EMI; combined with selectable operating modes (forced continuous, pulse-skip, Burst), it delivers <10mVPP output ripple at light loads and >90% efficiency at 6A with 3.3V→1.8V conversion.
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 rail inputs without pre-regulation |
| VOUT Range | 0.5V to VIN - enables direct core supply for low-voltage FPGAs, ASICs, and µPs |
| Output Accuracy | ±1% over temperature - ensures stable logic voltage margins across –55°C to +150°C |
| Switching Frequency | 3MHz–10MHz (programmable via RT or SYNC) - allows compact 110nH inductors and sub-10µF ceramic output caps |
| Top/Bottom RDS(ON) | 31mΩ / 8mΩ - minimizes conduction loss at 6A, enabling >93% peak efficiency at 3.3V→1.8V |
| Quiescent Current | 40µA in Burst Mode - extends battery runtime in always-on automotive sensors and telematics |
| Min On-Time | 22ns - supports high step-down ratios (e.g., 5.5V→0.5V) at 6.6MHz without pulse skipping |
| Thermal Range | –55°C to +150°C (MP grade) - qualified for under-hood automotive, avionics, and harsh industrial environments |
Pinout & Package
The LTC3309BMPV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), requiring soldering to a large 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 to reject PCB IR drop |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing via resistor divider from upstream rail |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; require parallel low-ESR ceramic bypassing to PGND and AGND |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path; must be connected with ≥6 vias to inner/outer ground planes |
| SW (5,6) | Switch node | High-di/dt node connecting internal MOSFETs to inductor; requires shortest possible wide copper trace |
| MODE/SYNC (9) | Mode select & clock sync | Ground = pulse-skip; float = forced continuous; VIN = Burst Mode; external 3–10MHz square wave = synchronized forced continuous |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 3–10MHz; open = default 6.6MHz; driven by SYNC overrides RT |
| PGOOD (11) | Power good indicator | Open-drain output asserting when VOUT is within –2%/+10% of regulation; includes 120µs delay and OV/UV fault detection |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT; phase-lead cap (2–22pF) improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces radiated EMI by >20dB vs conventional buck converters, eliminating need for ferrite beads or metal shields |
| Low-ripple Burst Mode® | Delivers 40µA IQ with <10mVPP output ripple at light loads - critical for noise-sensitive RF and sensor circuits |
| 100% duty cycle operation | Enables dropout operation down to VIN – ILOAD×RDS(ON), supporting brownout resilience in automotive start-stop systems |
| AEC-Q100 Grade MP | Qualified for –55°C to +150°C junction operation with full characterization - meets automotive engine control and ADAS requirements |
| Integrated protection suite | Includes output overvoltage lockout (110% VOUT), short-circuit recovery with valley-current limiting, thermal shutdown (165°C), and soft-start (0.25–3ms) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Powering 3.3V microcontroller cores and CAN transceivers in under-hood ECUs exposed to –40°C to +150°C ambient. IC Role / Device Role / Timing Role: Primary POL regulator converting 5V vehicle bus to 3.3V/1.2V rails with AEC-Q100 MP-grade reliability and EMI immunity. Use Value: Silent Switcher architecture prevents interference with CAN FD communication; 100% duty cycle maintains operation during cranking (5.5V→4.0V sag). | Use Scenario: Generating isolated 5V and 3.3V supplies for analog sensor front-ends and digital logic in factory-floor PLC modules. IC Role / Device Role / Timing Role: High-density step-down converter replacing discrete buck controllers and external MOSFETs in space-constrained DIN-rail enclosures. Use Value: 2mm × 2mm footprint saves >60% board area vs legacy 5mm × 5mm solutions; Burst Mode extends uptime in battery-backed backup systems. |
| Optical Transceiver Line Card | FPGA-Based Edge AI Accelerator |
Use Scenario: Supplying 1.8V/12A rails to multi-channel DSPs and laser drivers in telecom CFP2/OSFP modules with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise POL regulator synchronized to system clock via MODE/SYNC pin to avoid beat frequencies in high-speed data paths. Use Value: 6.6MHz switching frequency enables <1µH inductors and eliminates audible noise; PGOOD enables hot-swap sequencing with FPGA configuration logic. | Use Scenario: Delivering clean 0.85V core voltage to Xilinx Versal or Intel Agilex FPGAs in edge inference servers with thermal constraints. IC Role / Device Role / Timing Role: High-efficiency, high-bandwidth buck converter with 22ns min on-time supporting dynamic voltage scaling across FPGA partial reconfiguration. Use Value: Peak current mode control achieves <5µs load transient recovery; ±1% VOUT accuracy ensures timing closure for 1GHz+ logic domains. |
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 | 6A, 2.7–16V input, 0.5–5.5V output; 3.5mΩ/1.5mΩ RDS(ON); requires external compensation | Broad input range suits 12V intermediate bus; higher RDS(ON) increases loss at 5V input | Select for 12V POL where input headroom exceeds 2.7V; avoid for 3.3V input due to lower efficiency vs LTC3309BMPV#TRPBF |
| MP2964GQKT-Z | 6A, 2.7–16V input, 0.6–5.5V output; 4.5mΩ/2.2mΩ RDS(ON); no Burst Mode, only DCM/PWM | Lacks ultralow-IQ mode; higher light-load ripple; no AEC-Q100 MP grade | Choose for cost-sensitive industrial applications without automotive temp or EMI requirements; not suitable for battery-powered or automotive designs |
Compared with TPS546B24RVFT and MP2964GQKT-Z, the LTC3309BMPV#TRPBF uniquely combines –55°C to +150°C operation, Silent Switcher EMI suppression, and 40µA Burst Mode IQ - making it the only option qualified for automotive under-hood and noise-critical optical networking POL use cases.
Availability
LTC3309BMPV#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, optical transceiver line cards, and FPGA-based edge AI accelerators requiring stable component supply across extended temperature and high-reliability environments.
Supply support for LTC3309BMPV#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 automotive, industrial, communications, and healthcare markets.
The LTC3309BMPV#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for ultra-small, low-EMI, high-efficiency point-of-load conversion in space- and noise-constrained applications.
FAQ
What is the maximum junction temperature rating for the LTC3309BMPV#TRPBF?
The LTC3309BMPV#TRPBF is rated for operation from –55°C to +150°C junction temperature, with overtemperature protection triggering at 165°C (typical) and resuming at 160°C. This MP-grade qualification makes it suitable for under-hood automotive and high-ambient industrial deployments where standard commercial or industrial grades would fail.
Does the LTC3309BMPV#TRPBF require external compensation components?
No, the LTC3309BMPV#TRPBF features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. Its peak current mode architecture with built-in slope compensation ensures stable operation across all load conditions and switching frequencies (3MHz–10MHz) without additional resistors or capacitors - reducing BOM count and layout complexity.
How does the Silent Switcher architecture in the LTC3309BMPV#TRPBF reduce EMI?
The LTC3309BMPV#TRPBF implements Silent Switcher architecture through symmetrical internal power switch layout, integrated input capacitors, and optimized pinout that minimizes high-di/dt loop area. This reduces common-mode EMI by >20dB compared to conventional buck converters, allowing compliance with CISPR 25 Class 5 automotive EMI standards without shielding or filtering components.
Can the LTC3309BMPV#TRPBF operate with a 2.25V input supply?
Yes, the LTC3309BMPV#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, its 22ns minimum on-time supports 0.5V outputs at up to ~4.5MHz, and its 100% duty cycle capability enables dropout operation - critical for battery-powered systems during deep discharge or automotive cold-crank scenarios.
What is the purpose of the AGND pin on the LTC3309BMPV#TRPBF?
The AGND pin on the LTC3309BMPV#TRPBF serves as the remote voltage sense return for the FB pin and the ground reference for internal analog circuitry. It must be connected directly to the negative terminal of the output capacitor at the load to reject PCB trace resistance and ensure ±1% output accuracy - unlike PGND, which carries high-switching currents and introduces noise if used as the feedback reference.
LTC3309BMPV#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:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A, 2A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BMPV#TRPBF FAQ
1.How can I place an order for LTC3309BMPV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BMPV#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 LTC3309BMPV#TRPBF reliable?
The price and inventory of LTC3309BMPV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BMPV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BMPV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BMPV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BMPV#TRPBF?
LTC3309BMPV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BMPV#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 LTC3309BMPV#TRPBF?
For technical support, including LTC3309BMPV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BMPV#TRPBF requirements.
6.How does Aetrix verify that LTC3309BMPV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BMPV#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 LTC3309BMPV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BMPV#TRPBF?
All LTC3309BMPV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BMPV#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 LTC3309BMPV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309BMPV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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