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Analog Devices Inc. LTC3309AMPV#TRPBF
- Part No.:
- LTC3309AMPV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3309AMPV#TRPBF.pdf
- Description:
- IC REG BUCK PROG 6A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,663
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Product details
Overview
LTC3309AMPV#TRPBF 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, and featuring Silent Switcher® architecture for ultralow EMI in automotive-grade –55°C to +150°C operation.
For engineers reviewing the LTC3309AMPV#TRPBF datasheet, LTC3309AMPV#TRPBF pinout, LTC3309AMPV#TRPBF application, or LTC3309AMPV#TRPBF equivalent, this page delivers verified technical context, real-world mode selection behavior (Burst/Pulse Skip/Forced Continuous), thermal performance data (θJA = 51°C/W), and validated alternatives for high-reliability power delivery in FPGA core supplies, optical networking, and battery-operated systems.
Technical Context
The LTC3309AMPV#TRPBF uses constant-frequency peak current mode control with programmable 1MHz–3MHz switching via RT resistor or external SYNC clock, enabling fast transient response and compatibility with small 220nH inductors. Its 22ns minimum on-time supports high step-down ratios at low VIN, while internal slope compensation adapts automatically during synchronization.
It integrates complementary PMOS/NMOS power switches (31mΩ/8mΩ typical RDS(ON)), supports 100% duty cycle for ultra-low dropout, and implements dual current limiting-peak (9.6A typ) and valley (7.8A)-to safely tolerate inductor saturation under overload without latch-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, USB PD, or 3.3V/5V rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - supports core voltages for modern FPGAs, ASICs, and microprocessors with tight tolerance requirements. |
| Output Accuracy | ±1% over temperature - ensures stable voltage regulation across –55°C to +150°C junction range without calibration. |
| Switching Frequency | 1MHz to 3MHz (programmable) - allows optimization of size vs. efficiency; default 2MHz minimizes inductor/capacitor footprint. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on, low-duty-cycle applications like telematics or sensor nodes. |
| Thermal Rating | –55°C to +150°C junction - qualified per AEC-Q100 for under-hood automotive, industrial control, and avionics environments. |
| EMI Performance | Silent Switcher® architecture - reduces radiated emissions by >20dB compared to conventional buck converters, easing EMC certification. |
Pinout & Package
The LTC3309AMPV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) soldered directly to PCB ground plane for low θJB (12°C/W) and robust thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect to output capacitor negative terminal at load to reject PCB IR drop and ensure ±1% regulation accuracy. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis enables reliable power-up sequencing from other rails; 1µA shutdown current minimizes system leakage. |
| VIN (3, 8) | Main power input | Dual pins reduce trace resistance and inductance; require local 1µF 0201 ceramic bypass to AGND/PGND for stable high-frequency operation. |
| PGND (4, 7, 13) | Power ground return | Exposed pad (Pin 13) is primary thermal path and low-inductance return for bottom switch; must be connected with ≥6 vias to inner ground plane. |
| SW (5, 6) | Switch node | High-current, high-dV/dt node connecting internal MOSFETs to inductor; requires short, wide copper pour to minimize EMI and switching losses. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures Burst (VIN), Pulse Skip (GND), or Forced Continuous (float); also accepts 1–3MHz external clock for system-level timing alignment. |
| RT (10) | Frequency programming | Resistor to AGND sets switching frequency; open circuit yields default 2MHz; tied to VIN disables RT and enables internal oscillator. |
| PGOOD (11) | Power status indicator | Open-drain output asserts high when VOUT is within –2%/+10% window; includes 120µs delay and hysteresis to reject noise-induced false trips. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider from VOUT to AGND; phase lead cap between FB/VOUT improves transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode® Operation | 40µA IQ at light load with low-output-ripple sleep/wake cycles - extends runtime in battery-powered systems without sacrificing regulation stability. |
| Silent Switcher® Architecture | Integrated dual-loop layout and flip-chip packaging - achieves CISPR 22 Class B EMI compliance without shielding or ferrites in typical 4-layer PCB layouts. |
| 22ns Minimum On-Time | Enables 2.25V-to-0.5V conversion at 2MHz - supports high step-down ratio applications (e.g., 3.3V → 0.85V for AI accelerators) without frequency foldback. |
| Valley Current Limit Protection | 7.8A IVALLEYMAX clamps reverse inductor current - prevents shoot-through and thermal runaway during overload or short-circuit conditions. |
| AEC-Q100 Qualified | Rated for –55°C to +150°C operation with full characterization - meets automotive reliability requirements for ADAS, infotainment, and powertrain subsystems. |
Applications
| FPGA Core Supply | Automotive Telematics |
|---|---|
|
Use Scenario: Powering Xilinx Kria KV260 or Intel Agilex FPGA core rails requiring 0.85V @ 5A with <1% ripple and fast load-step response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage; operates in Forced Continuous Mode to maintain fixed 2MHz frequency and minimize output ripple during bursty logic activity. Use Value: 22ns min-on-time enables direct 3.3V-to-0.85V conversion; Silent Switcher® eliminates need for EMI filters, reducing BOM cost and board area by >30%. |
Use Scenario: Supplying LTE/V2X modem and GNSS receiver in vehicle black box units exposed to under-hood temperatures up to 125°C ambient. IC Role / Device Role / Timing Role: Main 5V-to-3.3V POL converter; leverages –55°C to +150°C rating and thermal shutdown (165°C) to sustain operation during engine heat soak events. Use Value: AEC-Q100 qualification ensures long-term reliability; 40µA Burst Mode IQ extends backup battery life during parked monitoring states. |
| Optical Network Line Card | Industrial IoT Sensor Hub |
|
Use Scenario: Generating 1.2V for 100G coherent DSPs in telecom line cards where EMI must meet stringent ITU-T G.9960 limits. IC Role / Device Role / Timing Role: High-efficiency, low-noise point-of-load regulator; synchronized to system clock via MODE/SYNC pin to eliminate beat frequencies in dense multi-rail boards. Use Value: Programmable 1–3MHz frequency avoids sensitive RF bands; Silent Switcher® reduces radiated emissions by >25dB, simplifying EMC debug. |
Use Scenario: Powering ARM Cortex-M7 MCU, LoRa transceiver, and MEMS sensors in sealed outdoor environmental monitors operating from lithium-thionyl chloride cells. IC Role / Device Role / Timing Role: Primary system regulator; configured in Burst Mode to achieve 10-year battery life while maintaining 0.5V–3.3V output flexibility across sensor variants. Use Value: 2.25V minimum VIN supports full cell discharge down to 2.4V; ±1% accuracy ensures consistent ADC reference and sensor biasing over temperature. |
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 |
|---|---|---|---|
| LTC3307EV#TRPBF | 3A rated, same 2mm × 2mm LQFN package but lower current capability and no AEC-Q100 qualification; 12mΩ/35mΩ RDS(ON). | Targeted at lower-power FPGA I/O banks or microcontroller peripherals rather than core rails. | Select when system load is ≤3A and automotive qualification is not required; offers cost advantage but lacks valley current limit and extended temperature range. |
| MP2451DT-LF-Z | 6A rated, 3.5V–36V input, no Burst Mode, higher 250µA quiescent current, SOIC-8 package (larger footprint, worse thermal performance). | Suitable for industrial 12V/24V intermediate bus conversion, not low-VIN battery or high-density POL use cases. | Choose only for wide-input industrial applications where EMI is less critical and PCB space is not constrained; does not support sub-1V outputs or automotive temp range. |
Compared with LTC3307EV#TRPBF and MP2451DT-LF-Z, the LTC3309AMPV#TRPBF uniquely combines 6A capability, –55°C to +150°C operation, Silent Switcher® EMI reduction, and 40µA Burst Mode IQ in a 2mm × 2mm footprint-making it the only option for space-constrained, high-reliability, low-noise POL designs.
Availability
LTC3309AMPV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive telematics modules, and optical networking line cards requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3309AMPV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC3309A family was designed for high-density, low-EMI point-of-load power delivery in mission-critical systems-emphasizing thermal robustness, precise regulation, and seamless integration into compact, noise-sensitive PCB layouts.
FAQ
What is the maximum junction temperature and thermal resistance of the LTC3309AMPV#TRPBF?
The LTC3309AMPV#TRPBF has a maximum junction temperature of +150°C and is characterized with θJA = 51°C/W on a standard JEDEC 2S2P test board. Its exposed PGND pad (Pin 13) provides θJB = 12°C/W to the PCB, enabling reliable operation in high-ambient environments when properly mounted to a thermal plane with ≥6 vias.
How does the MODE/SYNC pin configure operating modes on the LTC3309AMPV#TRPBF?
The LTC3309AMPV#TRPBF uses the MODE/SYNC pin to select three distinct modes: tie to GND for Pulse Skip (low-noise, moderate efficiency), float for Forced Continuous (fixed frequency, lowest ripple), or tie to VIN for Burst Mode (40µA IQ, highest light-load efficiency). When driven by an external 1–3MHz clock, it synchronizes and defaults to Forced Continuous Mode.
Can the LTC3309AMPV#TRPBF operate with input voltage below 2.5V, and what design considerations apply?
Yes, the LTC3309AMPV#TRPBF supports VIN as low as 2.25V. At low input, RDS(ON) of internal MOSFETs increases, raising conduction loss. Designers must verify worst-case die temperature using TJ = TA + (PD × θJA), especially at high load currents and elevated ambient temperatures, and ensure sufficient headroom for 100% duty cycle operation near dropout.
What protection features are integrated into the LTC3309AMPV#TRPBF?
The LTC3309AMPV#TRPBF includes output overvoltage protection (shuts off top switch if FB > 110% VOUT), short-circuit protection via valley current limiting (7.8A), thermal shutdown at ~165°C, input UVLO (2.1V rising), and PGOOD fault reporting with 120µs delay. It also tolerates inductor saturation without latch-off due to dual current limit architecture.
Is the LTC3309AMPV#TRPBF pin-compatible with other members of the LTC3309A family?
Yes, all LTC3309A variants-including LTC3309AEV#TRPBF, LTC3309AJV#TRPBF, and LTC3309AMPV#TRPBF-share identical 12-lead 2mm × 2mm LQFN pinout and footprint. Only temperature grade and screening differ; no PCB redesign is needed when upgrading from commercial to automotive or extended temperature versions.
LTC3309AMPV#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3309AMPV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3309AMPV#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 LTC3309AMPV#TRPBF reliable?
The price and inventory of LTC3309AMPV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3309AMPV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3309AMPV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3309AMPV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3309AMPV#TRPBF?
LTC3309AMPV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3309AMPV#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 LTC3309AMPV#TRPBF?
For technical support, including LTC3309AMPV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3309AMPV#TRPBF requirements.
6.How does Aetrix verify that LTC3309AMPV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3309AMPV#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 LTC3309AMPV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3309AMPV#TRPBF?
All LTC3309AMPV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3309AMPV#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 LTC3309AMPV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3309AMPV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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