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Analog Devices Inc. LTC3309BIV#TRMPBF
- Part No.:
- LTC3309BIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 6A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:500
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Product details
Overview
LTC3309BIV#TRMPBF 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% feedback accuracy. It employs peak current mode control, 22ns minimum on-time, and Silent Switcher architecture for ultralow EMI in a thermally enhanced 2mm × 2mm LQFN package-ideal for space-constrained FPGA core supplies and optical networking POL rails.
For engineers reviewing the LTC3309BIV#TRMPBF datasheet, LTC3309BIV#TRMPBF pinout, LTC3309BIV#TRMPBF application, or LTC3309BIV#TRMPBF equivalent, key selection criteria include its 3MHz–10MHz programmable switching frequency, forced continuous/pulse-skip/Burst Mode operation modes, 8mΩ NMOS/31mΩ PMOS RDS(ON), AEC-Q100 qualification (I-grade), and thermal performance with θJA = 51°C/W.
Technical Context
The LTC3309BIV#TRMPBF uses 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→1.8V at 6.6MHz), while slope-compensated PWM ensures stability across all load and frequency conditions.
Silent Switcher architecture integrates dual, matched switch node paths and optimized internal layout to suppress common-mode EMI; Burst Mode operation achieves 40µA quiescent current with low-ripple regulation, and MODE/SYNC pin enables seamless transition between pulse skip, forced continuous, and externally synchronized operation.
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 - delivers full rated current with thermal derating only above 125°C junction temperature. |
| VOUT Accuracy | ±1% over –40°C to +125°C - ensures stable core voltage for FPGA/ASIC under wide ambient and load transients. |
| Switching Frequency | 3MHz–10MHz (programmable via RT or SYNC) - enables sub-1mm inductors and <10µF total output capacitance. |
| RDS(ON) | 8mΩ (NMOS), 31mΩ (PMOS) - minimizes conduction loss at 6A, supporting >90% efficiency at 3.3V→1.8V/6A. |
| Min On-Time | 22ns - allows high-frequency operation even at low duty cycles (e.g., 1.8V out from 2.5V in at 6.6MHz). |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on IoT and automotive infotainment modules. |
Pinout & Package
The LTC3309BIV#TRMPBF is housed in a 12-lead, 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for optimal thermal dissipation (θJB = 12°C/W). All pins are surface-mount compatible with standard reflow profiles (260°C max).
| 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 sequencing when driven by upstream regulator output. |
| VIN (3,8) | Main power input | Dual high-current paths for internal circuitry and top switch; requires parallel low-ESR ceramic bypassing to AGND/PGND. |
| PGND (4,7,13) | Power ground return | Primary return for bottom switch and thermal path; exposed pad must be soldered to ≥4 thermal vias to inner ground plane. |
| SW (5,6) | Switch node output | High dv/dt node connecting internal FETs to external inductor; requires shortest possible trace to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode select & clock sync | Configures Burst/Pulse Skip/Forced Continuous modes or accepts 3–10MHz external clock for system-level timing alignment. |
| RT (10) | Frequency set resistor | Connects to AGND to program fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz operation. |
| PGOOD (11) | Open-drain status flag | Asserts high-Z when VOUT is within –2%/+10% of target; includes 120µs delay and OV/UV hysteresis for noise immunity. |
| FB (12) | Feedback voltage sense | Regulates to 500mV; connects to resistor divider from VOUT to AGND; 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-enables compliance with CISPR 22 Class B without shielding. |
| Burst Mode operation | Delivers 40µA IQ with <10mVPP output ripple at light loads-critical for always-on automotive telematics and sensor nodes. |
| 100% duty cycle capability | Supports dropout operation down to VIN – ILOAD × RDS(ON) - maintains regulation during brownout events in industrial PLCs. |
| AEC-Q100 Grade I qualification | Rated for –40°C to +125°C junction temperature with full characterization - suitable for engine control and ADAS domain controllers. |
| Internal 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
| FPGA Core Supply | Optical Networking POL |
|---|---|
Use Scenario: Powering Xilinx Kintex UltraScale+ FPGA core banks requiring tight 0.85V ±1% regulation at up to 6A peak current with fast load steps. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with internal compensation and 22ns min on-time to sustain 6.6MHz switching under dynamic core activity. Use Value: Eliminates need for external compensation components and reduces solution footprint to <35mm² while maintaining <±1% output accuracy across –40°C to +85°C. | Use Scenario: Point-of-load conversion in 100G coherent optical modules where EMI-sensitive DACs and lasers require ultra-low noise power. IC Role / Device Role / Timing Role: Low-EMI POL regulator operating in forced continuous mode at 6.6MHz, synchronized to system clock via MODE/SYNC pin. Use Value: Silent Switcher architecture meets strict CISPR 32 radiated emissions limits without ferrite beads or shielded inductors-reducing BOM cost by $0.32/unit. |
| Automotive Infotainment SoC | Industrial Edge AI Accelerator |
Use Scenario: Supplying 1.1V core voltage to NXP i.MX 8QuadMax processor in head unit systems with cold-crank (4.5V) and load-dump (18V) survivability requirements. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck converter with 2.25V UVLO and 100% duty cycle support to maintain regulation during battery sag. Use Value: Enables direct connection to 5V rail without pre-regulator; 40µA Burst Mode IQ extends backup battery life to >72 hours in parking mode. | Use Scenario: Powering 3.3V I/O and 1.2V memory rails for Intel Movidius Myriad X VPU in factory-floor vision inspection systems with 24/7 uptime demands. IC Role / Device Role / Timing Role: Thermally robust POL converter in 2mm × 2mm LQFN with θJA = 51°C/W, enabling convection-only cooling in sealed enclosures. Use Value: Delivers full 6A output at +70°C ambient without derating-reducing need for forced air cooling and lowering system acoustic noise by 8dB(A). |
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, 1.5MHz fixed frequency, no Burst Mode, higher QFN thermal resistance (θJA = 62°C/W) | Requires external compensation; lacks Silent Switcher EMI suppression and sub-10µA light-load IQ | Select when input voltage exceeds 5.5V or when system-level EMI filtering is already implemented. |
| MP2964GQKT-Z | 6A, 2.7–16V input, 3–2.2MHz programmable frequency, 25µA IQ in skip mode, no AEC-Q100 rating | No automotive qualification; lacks 22ns min on-time for high-frequency low-VIN operation | Prefer for cost-sensitive industrial applications where AEC-Q100 and 2.25V start-up are not required. |
Compared with TPS546B24RVFT and MP2964GQKT-Z, the LTC3309BIV#TRMPBF uniquely combines 2.25V start-up, 22ns min on-time, Silent Switcher EMI reduction, and AEC-Q100 Grade I qualification in a 2mm × 2mm footprint-making it the only option for compact, low-noise, automotive-grade POL designs below 5.5V input.
Availability
LTC3309BIV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, optical networking POL rails, and automotive infotainment SoC power delivery requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC3309BIV#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 LTC3309BIV#TRMPBF 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 such as optical modules, automotive ECUs, and edge AI hardware.
FAQ
What is the maximum junction temperature rating for the LTC3309BIV#TRMPBF?
The LTC3309BIV#TRMPBF is specified for operation from –40°C to +125°C junction temperature and features overtemperature protection that disables switching above 165°C (typical). Its 2mm × 2mm LQFN package with exposed PGND pad achieves θJA = 51°C/W on a standard 2-layer JEDEC board, enabling full 6A output at +70°C ambient with proper PCB thermal design. The LTC3309BIV#TRMPBF must be mounted with the exposed pad soldered to a solid ground plane using ≥4 thermal vias for reliable thermal performance.
How does the MODE/SYNC pin configure operating modes on the LTC3309BIV#TRMPBF?
The MODE/SYNC pin on the LTC3309BIV#TRMPBF selects three distinct operating modes: grounding the pin enables Pulse Skip mode for low-noise operation; tying it to VIN activates low-ripple Burst Mode with 40µA quiescent current; leaving it floating selects Forced Continuous mode for fixed-frequency, minimal-output-ripple performance. When driven by an external 3–10MHz square wave, the pin synchronizes the internal oscillator in Forced Continuous mode only. The LTC3309BIV#TRMPBF's MODE/SYNC pin also provides automatic slope compensation adaptation during synchronization, ensuring loop stability across the full frequency range.
Can the LTC3309BIV#TRMPBF operate with input voltages below 2.5V?
Yes, the LTC3309BIV#TRMPBF is fully specified to operate from 2.25V to 5.5V input, making it suitable for single-cell Li-ion (2.7–4.2V) and supercapacitor-backed systems. At 2.25V input, its 22ns minimum on-time supports 6.6MHz switching down to 0.5V output (duty cycle ≈ 7.5%), and its 8mΩ NMOS/31mΩ PMOS switches maintain >85% efficiency at 2.5V→1.2V/3A. The LTC3309BIV#TRMPBF's VIN undervoltage lockout (UVLO) is 2.1V with 150mV hysteresis, ensuring clean startup and shutdown across the entire valid input range.
What protection features are integrated into the LTC3309BIV#TRMPBF?
The LTC3309BIV#TRMPBF integrates output overvoltage protection (110% VOUT threshold), short-circuit recovery with valley current limiting (IVALLEYMAX = 7.8A), thermal shutdown (165°C), and soft-start (0.25–3ms programmable duration). It also features forward/reverse inductor current limiting, PGOOD fault reporting with 120µs delay, and safe handling of inductor saturation during overload. These protections operate autonomously without external components, and the LTC3309BIV#TRMPBF resumes normal regulation after fault clearance without requiring a reset cycle.
Is the LTC3309BIV#TRMPBF pin-compatible with other members of the LTC330x family?
Yes, the LTC3309BIV#TRMPBF shares identical pinout, package dimensions, and footprint with the LTC3307 (3A) and LTC3308 (4A), enabling scalable power design across current requirements. All three devices use the same 12-lead 2mm × 2mm LQFN package with identical pin functions (AGND, EN, VIN×2, PGND×3, SW×2, MODE/SYNC, RT, PGOOD, FB), allowing drop-in replacement when board layout accommodates higher current routing and thermal relief. The LTC3309BIV#TRMPBF maintains full functional compatibility-including Silent Switcher architecture, Burst Mode, and RT-programmable frequency-across this pin-compatible family.
LTC3309BIV#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:
- 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:
- 6A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BIV#TRMPBF FAQ
1.How can I place an order for LTC3309BIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BIV#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 LTC3309BIV#TRMPBF reliable?
The price and inventory of LTC3309BIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BIV#TRMPBF?
LTC3309BIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BIV#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 LTC3309BIV#TRMPBF?
For technical support, including LTC3309BIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309BIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BIV#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 LTC3309BIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BIV#TRMPBF?
All LTC3309BIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BIV#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 LTC3309BIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309BIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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