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Analog Devices Inc. LTC3309BMPV#TRMPBF
- Part No.:
- LTC3309BMPV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309BMPV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
LTC3309BMPV#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, regulating down to 0.5V with ±1% feedback accuracy, and featuring 22ns minimum on-time, 6.6MHz default switching frequency, and Silent Switcher architecture for ultralow EMI-used in FPGA core supplies and automotive infotainment power rails.
For engineers reviewing the LTC3309BMPV#TRMPBF datasheet, LTC3309BMPV#TRMPBF pinout, LTC3309BMPV#TRMPBF application, or LTC3309BMPV#TRMPBF equivalent, key selection criteria include its –55°C to +150°C extended temperature grade, 12-lead 2mm × 2mm LQFN package with exposed PGND pad, forced continuous/pulse-skip/Burst Mode operation, and compatibility with low-profile 110nH inductors in space-constrained POL designs.
Technical Context
The LTC3309BMPV#TRMPBF implements constant-frequency peak current mode control with internal compensation, supporting programmable 3MHz–10MHz switching via RT resistor or external clock synchronization on MODE/SYNC. Its dual MOSFET power stage features 8mΩ NMOS and 31mΩ PMOS RDS(ON), enabling high efficiency across load range while maintaining fast transient response.
Silent Switcher architecture uses symmetrical layout and integrated bypass capacitors to suppress common-mode EMI; Burst Mode operation achieves 40µA quiescent current at light loads, and overvoltage protection triggers at 110% VOUT with 120µs delay before PGOOD assertion failure.
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 at TJ ≤ 150°C with proper PCB thermal design |
| VOUT Accuracy | ±1% over temperature - ensures stable core voltage for FPGA/ASIC under thermal stress |
| fSW Default | 6.6MHz (typ) - enables use of sub-2mm inductors and reduces output capacitor count |
| tON,min | 22ns - allows high step-down ratios (e.g., 5.5V→0.5V) at 10MHz without pulse skipping |
| Thermal Range | –55°C to +150°C - qualified for extended automotive under-hood and industrial control environments |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on telematics modules |
Pinout & Package
The LTC3309BMPV#TRMPBF 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 with multiple vias for θJB = 12°C/W thermal performance.
| 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 minimize load regulation error |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; ties to upstream rail for sequenced power-up in multi-rail systems |
| VIN (3,8) | Main power input | Dual pins reduce IR drop and inductance; require parallel low-ESR ceramic bypassing to AGND and PGND |
| PGND (4,7,13) | Power ground return | Exposes thermal path via Pin 13; all three pins must connect to solid ground plane for EMI suppression and thermal dissipation |
| SW (5,6) | Switch node | High di/dt node connecting internal FETs to external inductor; requires short, wide copper pour to limit ringing |
| MODE/SYNC (9) | Mode select & clock sync | Configures Burst/Continuous/Pulse-Skip modes or accepts 3–10MHz external clock for system-level timing alignment |
| RT (10) | Frequency programming | Resistor-to-AGND sets fSW from 3–10MHz; open or tied to VIN selects 6.6MHz default |
| PGOOD (11) | Power status indicator | Open-drain output asserting high when VOUT is within –2%/+10% window; includes 120µs debounce and OV/UV fault reporting |
| FB (12) | Feedback input | Regulates VOUT by holding 500mV at this pin; connects to resistor divider from VOUT to AGND |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for metal shielding in EMC-critical telecom modules |
| Low-ripple Burst Mode | Delivers 40µA IQ at light loads while maintaining <10mVPP output ripple-ideal for noise-sensitive RF power supplies |
| 100% duty cycle operation | Enables dropout operation down to VIN – VOUT ≈ ILOAD × RDS(ON)_PMOS, supporting brownout resilience in automotive start-stop systems |
| Inductor saturation tolerance | Safely handles temporary inductor saturation during overload without latch-up or damage-critical for motor driver auxiliary rails |
| AEC-Q100 qualified | Rated for automotive applications per Grade MP (–55°C to +150°C junction), including HTOL and temperature cycling validation |
Applications
| Automotive Infotainment | FPGA Core Supply |
|---|---|
Use Scenario: Powering SoC and display controller in head-unit systems exposed to engine bay thermal transients. IC Role / Device Role / Timing Role: Primary 1.2V/6A POL regulator with soft-start sequencing and PGOOD monitoring for system boot integrity. Use Value: –55°C to +150°C rating ensures reliability during cold cranking and under-hood hot soak; Burst Mode extends standby battery life. | Use Scenario: Delivering tightly regulated 0.85V core voltage to Xilinx Zynq UltraScale+ MPSoC in edge AI gateway. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck with 22ns min-on-time enabling rapid load-step response to dynamic logic switching. Use Value: 6.6MHz switching allows compact 110nH inductor and 4.7µF output caps, reducing board area by 40% vs 1MHz alternatives. |
| Optical Networking Line Card | Industrial PLC I/O Module |
Use Scenario: Generating 3.3V/6A for SerDes and transceiver ASICs in 100G coherent optical modules. IC Role / Device Role / Timing Role: Low-noise POL converter synchronized to system clock via MODE/SYNC pin to avoid beat frequencies in analog front-end. Use Value: Silent Switcher EMI reduction eliminates filtering components, meeting CISPR 32 Class B without shielded inductors. | Use Scenario: Providing isolated 5V/6A bias for digital I/O drivers in factory automation controllers operating in electrically noisy environments. IC Role / Device Role / Timing Role: Robust step-down regulator with overvoltage/short-circuit protection and thermal shutdown for unattended 24/7 operation. Use Value: 100% duty cycle capability maintains output during 12V bus dips to 6V; AEC-Q100 qualification ensures long-term field reliability. |
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 | 4.5V–18V input, 6A, 1.5MHz max fSW, no Burst Mode, higher RDS(ON) (12mΩ/20mΩ) | Requires larger magnetics; unsuitable for ultra-low-noise or battery-powered use | Select when input voltage exceeds 5.5V or when lower EMI sensitivity permits slower switching |
| MP28164GQVA-LF-Z | 2.7V–16V input, 6A, 500kHz–2.2MHz fSW, 55µA IQ in skip mode, no AEC-Q100 | Lacks automotive qualification and Silent Switcher EMI performance | Choose for cost-sensitive industrial applications where extended temperature and EMI are not critical |
Compared with TPS546B24RVFT and MP28164GQVA-LF-Z, the LTC3309BMPV#TRMPBF uniquely combines ultra-high-frequency operation (up to 10MHz), industry-leading EMI suppression, and automotive-grade reliability in a 2mm × 2mm footprint-making it optimal for next-gen compact, noise-sensitive, and mission-critical power delivery.
Availability
LTC3309BMPV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, and optical networking line cards requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3309BMPV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3309BMPV#TRMPBF belongs to the Silent Switcher® monolithic DC/DC converter product line, engineered specifically for high-density, low-EMI power delivery in automotive, telecom, and computing applications where thermal and spectral constraints are severe.
FAQ
What is the maximum junction temperature specification for the LTC3309BMPV#TRMPBF?
The LTC3309BMPV#TRMPBF is rated for a maximum junction temperature of +150°C and operates across a junction temperature range of –55°C to +150°C. Its thermal protection circuitry disables switching when die temperature reaches approximately 165°C and resumes operation once temperature falls to ~160°C. This extended range makes LTC3309BMPV#TRMPBF suitable for under-hood automotive applications and high-ambient industrial environments.
How does the MODE/SYNC pin configure operating modes on the LTC3309BMPV#TRMPBF?
The MODE/SYNC pin on the LTC3309BMPV#TRMPBF selects between 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 PWM with minimal output ripple. When driven by an external 3–10MHz square wave, LTC3309BMPV#TRMPBF synchronizes its switching and operates in Forced Continuous mode.
Can the LTC3309BMPV#TRMPBF support output voltages below 1V?
Yes, the LTC3309BMPV#TRMPBF regulates output voltages as low as 0.5V using its precision 500mV feedback reference. The FB pin is internally regulated to 0.5V ±1%, allowing accurate scaling via external resistor dividers. For example, a 0.85V output is achieved with RA = 70kΩ and RB = 10kΩ. This capability enables direct powering of advanced FPGA and ASIC cores without intermediate regulation stages.
What is the purpose of the AGND pin on the LTC3309BMPV#TRMPBF, and how should it be routed?
The AGND pin on the LTC3309BMPV#TRMPBF serves as the remote ground sense reference for the feedback network and the analog ground for internal circuitry. It must be connected directly to the negative terminal of the output capacitor at the load point-not to the local PGND-to eliminate PCB trace IR drop errors and ensure tight load regulation. A small 0201 or 0402 ceramic capacitor should be placed between AGND and VIN for analog bypassing, and RT/FB return paths must also tie to AGND.
Does the LTC3309BMPV#TRMPBF include protection against output overvoltage events?
Yes, the LTC3309BMPV#TRMPBF includes dedicated output overvoltage protection that disables the top power switch when the FB pin voltage exceeds 110% of the nominal output voltage. If the overvoltage condition persists beyond 120µs, the PGOOD pin is pulled low to signal fault. This protection operates independently of the main regulation loop and remains active in all operating modes, safeguarding downstream logic and memory from voltage-induced damage.
LTC3309BMPV#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:
- 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#TRMPBF FAQ
1.How can I place an order for LTC3309BMPV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309BMPV#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 LTC3309BMPV#TRMPBF reliable?
The price and inventory of LTC3309BMPV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309BMPV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3309BMPV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309BMPV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309BMPV#TRMPBF?
LTC3309BMPV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309BMPV#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 LTC3309BMPV#TRMPBF?
For technical support, including LTC3309BMPV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309BMPV#TRMPBF requirements.
6.How does Aetrix verify that LTC3309BMPV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309BMPV#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 LTC3309BMPV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3309BMPV#TRMPBF?
All LTC3309BMPV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309BMPV#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 LTC3309BMPV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3309BMPV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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