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Analog Devices Inc. LTC3309BJV#TRPBF
- Part No.:
- LTC3309BJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BJV#TRPBF.pdf
- Description:
- IC REG BUCK 6A
- Quantity:
- Payment:
- Shipping:
Inventory:1,148
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Product details
Overview
LTC3309BJV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 6A output at 500mV–VIN, operating from 2.25V–5.5V input with 6.6MHz default switching frequency, 22ns minimum on-time, and ±1% VFB accuracy. It integrates 31mΩ PMOS and 8mΩ NMOS power switches in a thermally enhanced 2mm × 2mm LQFN package, targeting high-density POL supplies for FPGA core rails and automotive infotainment systems.
For engineers reviewing the LTC3309BJV#TRPBF datasheet, LTC3309BJV#TRPBF pinout, LTC3309BJV#TRPBF application, or LTC3309BJV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to +150°C), Silent Switcher EMI reduction, programmable 3–10MHz frequency via RT pin, Burst Mode IQ of 40µA, and support for forced continuous, pulse-skip, or synchronized operation - all critical for noise-sensitive, space-constrained, and thermally demanding embedded power designs.
Technical Context
The LTC3309BJV#TRPBF employs constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its architecture supports three distinct operating modes-forced continuous (low ripple), pulse-skip (low-noise), and Burst Mode (ultra-low IQ)-selected via the MODE/SYNC pin voltage level.
It integrates dual power MOSFETs (31mΩ PMOS top switch, 8mΩ NMOS bottom switch), provides 100% duty cycle capability for low-dropout operation, and features robust protection including output overvoltage detection (107–114% VOUT threshold), thermal shutdown at 165°C, and valley current limiting (7.8A IVALLEYMAX) to prevent inductor saturation during overload.
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 rails. |
| IOUT Max | 6A continuous - sufficient for high-current FPGA, ASIC, or microprocessor core supplies. |
| fSW Range | 3MHz to 10MHz - enables ultra-small inductors (e.g., 110nH) and capacitors for minimal PCB footprint. |
| tON,min | 22ns - allows high step-down ratios (e.g., 5.5V→0.5V) at 10MHz without pulse skipping. |
| VFB Accuracy | ±1% over temperature - ensures tight output regulation for sensitive digital loads. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on automotive or IoT edge nodes. |
| Thermal Rating | Junction temp rated to +150°C - qualified per AEC-Q100 for under-hood automotive applications. |
| Package | 12-lead 2mm × 2mm × 0.74mm LQFN with exposed PGND pad - achieves θJA = 51°C/W for compact thermal management. |
Pinout & Package
The LTC3309BJV#TRPBF is housed in a thermally optimized 12-lead LQFN (2mm × 2mm × 0.74mm) with an exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for electrical integrity and thermal dissipation. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; reference for internal analog circuitry - must connect directly to output capacitor negative terminal at load. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis - enables event-driven sequencing; 1µA shutdown current. |
| VIN (3, 8) | Main power input | Dual pins for low-inductance routing to internal top switch and bias circuitry - bypass separately to PGND and AGND. |
| PGND (4, 7, 13) | Power ground return | Return path for bottom switch and exposed thermal pad - requires multiple vias to internal ground plane for <12°C/W θJB. |
| SW (5, 6) | Switch node | Drives external inductor - must be short, wide, and symmetrically routed to minimize ringing and EMI. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures operation mode (Burst/Continuous/Pulse-Skip) or accepts 3–10MHz external clock for system-wide timing alignment. |
| RT (10) | Frequency programming | Resistor-to-AGND sets fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% window - includes 120µs delay and OV/UV hysteresis. |
| FB (12) | Feedback input | Senses regulated 0.5V reference - connects to resistor divider from VOUT to set output voltage with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Minimizes EMI emissions via balanced SW node layout and integrated input caps - meets CISPR 22 Class B without shielding. |
| Low-ripple Burst Mode | Delivers 40µA quiescent current while maintaining <10mVPP output ripple - ideal for battery-powered always-on systems. |
| 100% duty cycle operation | Enables dropout operation down to VIN – (ILOAD × RDS(ON)) - supports high-efficiency LDO-like behavior near VOUT. |
| AEC-Q100 Grade J qualification | Guaranteed operation from –40°C to +150°C junction temperature - validated for automotive engine control and ADAS modules. |
| Internal compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time for POL applications. |
| Inductor saturation tolerance | Safely handles temporary inductor saturation during overload - prevents latch-up and enables robust short-circuit recovery. |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
Use Scenario: Powering SoC and GPU cores in head-unit displays with strict EMI limits and thermal constraints under hood. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V/3.3V POL regulator delivering up to 6A with synchronized switching to avoid beat frequencies with display clocks. Use Value: Silent Switcher architecture reduces conducted/radiated emissions below CISPR 25 Level 5 thresholds without ferrite beads or shields. | Use Scenario: Providing tightly regulated, low-noise core voltage to Xilinx Artix-7 or Intel Cyclone V FPGAs during dynamic reconfiguration. IC Role / Device Role / Timing Role: High-bandwidth, fast-transient buck converter with 22ns tON,min and internal compensation - maintains VCCINT stability during sudden logic switching. Use Value: 6.6MHz operation enables use of 110nH inductors and 4.7µF ceramic output caps - achieving <1mm² solution size per rail. |
| Optical Network Line Card | Industrial PLC I/O Module |
Use Scenario: Generating isolated 3.3V and 1.2V rails for SerDes transceivers and DSPs in compact 1RU optical line cards. IC Role / Device Role / Timing Role: High-efficiency, low-EMI step-down converter operating from 5V backplane with clock synchronization to system master clock. Use Value: MODE/SYNC pin accepts 6.6MHz external clock - eliminates jitter accumulation and simplifies timing analysis across multi-rail power domains. | Use Scenario: Powering isolated analog front-ends and microcontrollers in DIN-rail mounted PLC modules exposed to ambient temperatures up to +70°C. IC Role / Device Role / Timing Role: Robust, thermally resilient POL regulator with AEC-Q100 Grade J rating and overtemperature protection at 165°C. Use Value: 2mm × 2mm LQFN package with θJB = 12°C/W enables full 6A output without heatsink - reducing system cost and footprint. |
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 |
|---|---|---|---|
| LTC3308EV#TRPBF | 4A output, same 2mm × 2mm LQFN package, identical pinout, but lower current rating and no AEC-Q100 qualification. | Targeted at non-automotive, lower-power FPGA I/O or memory rails where 4A suffices. | Select when board space is constrained and 4A output meets load requirements - avoids redesign but lacks automotive temp range. |
| MP2174GQZ-P | 6A output, 2.5V–5.5V input, 2.2MHz fixed frequency, QFN-12 (3mm × 3mm), no Burst Mode or AEC-Q100 rating. | Suitable for industrial or telecom POL where EMI is less critical and larger footprint is acceptable. | Choose for cost-sensitive, non-automotive applications needing simpler fixed-frequency operation - not drop-in due to larger package and different pin assignment. |
Compared with LTC3308EV#TRPBF and MP2174GQZ-P, the LTC3309BJV#TRPBF uniquely combines 6A capability, AEC-Q100 Grade J qualification, Silent Switcher EMI performance, and 3–10MHz programmability in a 2mm × 2mm footprint - making it the only option for space-limited, high-reliability automotive or optical networking POL designs requiring sub-10mV ripple and <40µA light-load IQ.
Availability
LTC3309BJV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, optical networking line cards, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3309BJV#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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3309B product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck regulators for point-of-load applications where board space, thermal density, and electromagnetic compatibility are critical - especially in automotive, optical, and high-speed digital systems.
FAQ
What is the maximum junction temperature rating for the LTC3309BJV#TRPBF?
The LTC3309BJV#TRPBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade J. Its thermal shutdown activates at approximately 165°C, with hysteresis ensuring safe restart at ~160°C. This rating makes the LTC3309BJV#TRPBF suitable for under-hood automotive applications and high-ambient industrial environments where sustained thermal stress is expected.
Does the LTC3309BJV#TRPBF support external clock synchronization?
Yes, the LTC3309BJV#TRPBF supports external clock synchronization via its MODE/SYNC pin, accepting square-wave inputs from 3MHz to 10MHz with >1.2V high and <0.4V low levels. During synchronization, the device operates in forced continuous mode with automatic slope compensation adaptation - enabling deterministic timing alignment across multi-rail power systems without additional PLL components.
What is the minimum output voltage achievable with the LTC3309BJV#TRPBF?
The LTC3309BJV#TRPBF regulates output voltages as low as 500mV, set by the feedback resistor divider referenced to its precise 0.5V internal bandgap. The ±1% VFB accuracy over temperature ensures stable low-voltage rails for advanced process-node FPGAs and ASICs, with no minimum load requirement for regulation.
How does the LTC3309BJV#TRPBF handle short-circuit conditions?
The LTC3309BJV#TRPBF implements dual-level current limiting: peak current limiting (9.6A typical) shuts off the top switch, while valley current limiting (7.8A IVALLEYMAX) holds off the top switch if bottom-switch current remains excessive. This prevents inductor saturation and enables controlled recovery - often without triggering full soft-start - preserving system uptime during transient faults.
Is the LTC3309BJV#TRPBF pin-compatible with other members of the LTC330x family?
Yes, the LTC3309BJV#TRPBF shares identical pinout and package with the LTC3307 (3A) and LTC3308 (4A), enabling scalable power design across product variants. However, current capability, thermal ratings (e.g., Grade J vs Grade E), and certain electrical specs (e.g., RDS(ON), tON,min) differ - requiring validation of thermal margin and transient response when substituting in existing layouts.
LTC3309BJV#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:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3309BJV#TRPBF FAQ
1.How can I place an order for LTC3309BJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BJV#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 LTC3309BJV#TRPBF reliable?
The price and inventory of LTC3309BJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BJV#TRPBF?
LTC3309BJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BJV#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 LTC3309BJV#TRPBF?
For technical support, including LTC3309BJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BJV#TRPBF requirements.
6.How does Aetrix verify that LTC3309BJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BJV#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 LTC3309BJV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BJV#TRPBF?
All LTC3309BJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BJV#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 LTC3309BJV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309BJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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