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Analog Devices Inc. LTC3308BEV#TRMPBF
- Part No.:
- LTC3308BEV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BEV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:271
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Product details
Overview
LTC3308BEV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output at 1.8V from 2.25V–5.5V input, featuring 6.6MHz default switching frequency, 22ns minimum on-time, ±1% VFB accuracy, and Silent Switcher® architecture for ultralow EMI - deployed in FPGA core supplies and compact POL systems.
For engineers reviewing the LTC3308BEV#TRMPBF datasheet, LTC3308BEV#TRMPBF pinout, LTC3308BEV#TRMPBF application, or LTC3308BEV#TRMPBF equivalent, key selection criteria include its 2mm × 2mm LQFN package, forced continuous/pulse-skipping/Burst Mode operation, 0.5V feedback reference, 100% duty cycle capability, and AEC-Q100-qualified temperature range (–40°C to +125°C).
Technical Context
The LTC3308BEV#TRMPBF employs 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 compensation adapts automatically during external clock synchronization via MODE/SYNC.
Silent Switcher® architecture uses dual symmetric power paths and integrated bypass capacitors to suppress common-mode EMI; combined with low 8mΩ NMOS and 31mΩ PMOS RDS(ON), it achieves >90% efficiency at 4A load while maintaining <10mVPP output ripple in forced continuous mode.
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. |
| VOUT Range | 0.5V to VIN - enables direct 1.8V, 1.2V, or 0.8V FPGA/ASIC core supplies with no external bias. |
| Max Output Current | 4A continuous - sustained under thermal limits using 2mm × 2mm LQFN with exposed PGND pad and θJA = 51°C/W. |
| Switching Frequency | 3MHz to 10MHz programmable via RT resistor or external SYNC clock - allows optimization of inductor size vs. efficiency. |
| Feedback Voltage | 0.5V ±1% over temperature - ensures tight output regulation across –40°C to +125°C junction range. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on IoT sensors and portable instrumentation. |
| Protection Features | Output overvoltage (110% VOUT), short-circuit, thermal shutdown, and reverse inductor current limiting - eliminates need for external fault management circuitry. |
Pinout & Package
The LTC3308BEV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal and EMI 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 reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis enables accurate power-up sequencing from other regulators. |
| VIN (3, 8) | Main power input | Dual pins reduce trace inductance; require parallel low-ESR ceramic capacitors to AGND and PGND. |
| PGND (4, 7, 13) | Power ground return | Exposed pad (Pin 13) is primary thermal path and must be connected to large PCB ground plane with ≥6 vias. |
| SW (5, 6) | Switch node output | Dual pins minimize switching loop inductance; connect together to inductor with shortest possible wide copper trace. |
| MODE/SYNC (9) | Mode selection & clock sync | Ground = pulse-skip; float = forced continuous; VIN = Burst Mode; external clock = synchronized forced continuous. |
| 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 asserts low if VOUT drops below 98% or rises above 110% of regulation, with 120µs delay. |
| FB (12) | Feedback input | Regulates voltage by holding at 0.5V; connects to resistor divider from VOUT to AGND for precise output setting. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB compared to conventional buck converters, eliminating need for shielding cans in space-constrained designs. |
| 22ns minimum on-time | Enables high step-down ratios (e.g., 5.5V→0.8V) at 6.6MHz, allowing use of sub-220nH inductors and shrinking total solution size to <15mm². |
| Burst Mode® operation | Delivers 40µA quiescent current at light loads while maintaining <10mVPP output ripple - critical for battery-powered edge AI nodes. |
| 100% duty cycle capability | Supports dropout operation down to VIN – ILOAD × RDS(ON)_PMOS, enabling seamless transition during brownout conditions in automotive infotainment systems. |
| AEC-Q100 qualification | Rated for automotive applications (Grade E: –40°C to +125°C), with guaranteed performance over lifetime under thermal cycling and vibration stress. |
Applications
| FPGA Core Supply | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Powering Xilinx Artix-7 FPGA core rail (1.0V/3A) from 3.3V intermediate bus in compact industrial PLC. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core voltage with soft-start and PGOOD sequencing. Use Value: 2mm × 2mm footprint saves >40% board area vs. legacy 3mm × 3mm converters; Burst Mode extends runtime in standby modes. |
Use Scenario: Generating 1.8V/2.5A supply for Sony IMX490 image sensor and ISP in rear-view camera ECU. IC Role / Device Role / Timing Role: AEC-Q100-compliant POL converter with thermal shutdown and overvoltage protection for functional safety compliance. Use Value: Silent Switcher® meets CISPR-25 Class 5 EMI limits without ferrite beads; 125°C junction rating ensures reliability under hood temperatures. |
| Optical Network Line Card | Industrial IoT Gateway |
|
Use Scenario: Delivering 3.3V/4A to SFP+ transceiver ASIC from 5V backplane in telecom line card with strict EMI requirements. IC Role / Device Role / Timing Role: High-frequency (6.6MHz) step-down regulator minimizing output capacitor count while meeting jitter-sensitive timing budgets. Use Value: 6.6MHz switching enables use of 10µF ×2 ceramic output caps instead of 47µF tantalum, reducing height and improving MTBF. |
Use Scenario: Providing 1.2V/3A to ARM Cortex-M7 microcontroller and LoRaWAN radio in battery-backed smart meter. IC Role / Device Role / Timing Role: Ultra-low-IQ DC/DC converter supporting 10-year battery life in periodic wake-up operation. Use Value: 40µA Burst Mode IQ cuts quiescent power to <130µW, extending CR2032 coin cell life beyond 8 years at 1-minute wake intervals. |
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 |
|---|---|---|---|
| LTC3307EDE#TRMPBF | 3A rated, identical 2mm × 2mm LQFN package and pinout, but lower current limit and 3.5MHz–6MHz frequency range. | Not suitable for >3A loads; lacks 100% duty cycle and AEC-Q100 qualification. | Select when 3A output suffices and cost reduction is prioritized over headroom and automotive compliance. |
| TPS62864DLCR | 4A, 2.5V–5.5V input, 1.8V fixed output, 2.5mm × 2.5mm WSON package, 2.2MHz–3.6MHz frequency, no Burst Mode. | Fixed-output variant only; higher quiescent current (12µA sleep, but no low-ripple Burst Mode); no Silent Switcher EMI suppression. | Choose for simpler BOM where fixed 1.8V output and moderate EMI are acceptable, and board area is less constrained. |
Compared with LTC3307EDE#TRMPBF and TPS62864DLCR, the LTC3308BEV#TRMPBF uniquely combines 4A capability, 6.6MHz operation, Silent Switcher EMI reduction, and AEC-Q100 qualification in a 2mm × 2mm footprint - making it the only option for space-limited, noise-sensitive, and automotive-grade 1.8V POL designs.
Availability
LTC3308BEV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS modules, optical networking equipment, and industrial IoT gateways requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LTC3308BEV#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 since 1965.
The LTC3308B product line delivers ultra-small, high-frequency synchronous buck converters optimized for space-constrained, low-EMI, and high-reliability applications including automotive, optical networking, and portable computing.
FAQ
What is the maximum junction temperature specification for the LTC3308BEV#TRMPBF?
The LTC3308BEV#TRMPBF is rated for an operating junction temperature range of –40°C to +125°C, with overtemperature protection engaging at ~165°C (typical). Its 2mm × 2mm LQFN package features an exposed PGND pad and θJA = 51°C/W, enabling reliable 4A operation at ambient temperatures up to +85°C with proper PCB thermal design. The LTC3308BEV#TRMPBF datasheet specifies derating curves for continuous operation above 125°C.
How does the MODE/SYNC pin configure operating modes on the LTC3308BEV#TRMPBF?
The MODE/SYNC pin on the LTC3308BEV#TRMPBF selects three distinct operating modes: grounding enables pulse-skipping mode for low-noise operation; floating enables forced continuous mode for fixed-frequency, minimal ripple performance; tying to VIN activates low-ripple Burst Mode® for highest light-load efficiency (40µA IQ). When driven by an external 3–10MHz square wave, the LTC3308BEV#TRMPBF synchronizes in forced continuous mode with automatic slope compensation adaptation.
Can the LTC3308BEV#TRMPBF support 100% duty cycle operation, and what is its practical dropout voltage?
Yes, the LTC3308BEV#TRMPBF supports true 100% duty cycle operation, allowing VOUT regulation even when VIN approaches VOUT. Its practical dropout voltage equals ILOAD × RDS(ON)_PMOS + ILOAD × DCRINDUCTOR; with 31mΩ top switch RDS(ON) and typical 10mΩ inductor DCR, dropout is ~164mV at 4A. This enables robust operation during input brownouts in automotive and industrial environments.
What is the recommended layout practice for the AGND and PGND connections on the LTC3308BEV#TRMPBF?
For the LTC3308BEV#TRMPBF, AGND (Pin 1) must connect directly to the negative terminal of the output capacitor at the load point - not to the main PCB ground plane - to enable accurate remote sensing. PGND (Pins 4, 7, and exposed Pad 13) requires a low-inductance, high-current return path: the exposed pad must be soldered to a solid internal or bottom-layer ground plane using ≥6 thermal vias, and input capacitors must connect directly to PGND pins with short, wide traces to minimize switching loop area and EMI.
Does the LTC3308BEV#TRMPBF require external compensation components?
No, the LTC3308BEV#TRMPBF features fully internal compensation, eliminating the need for external Type II or Type III compensation networks. Its peak current mode control architecture with built-in slope compensation and error amplifier is factory-tuned for stability with standard ceramic output capacitors (e.g., 2 × 4.7µF) and typical 150nH–220nH inductors. Only the FB resistor divider and optional CFF phase-lead capacitor are required for basic operation.
LTC3308BEV#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)
LTC3308BEV#TRMPBF FAQ
1.How can I place an order for LTC3308BEV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BEV#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 LTC3308BEV#TRMPBF reliable?
The price and inventory of LTC3308BEV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BEV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BEV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BEV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BEV#TRMPBF?
LTC3308BEV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BEV#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 LTC3308BEV#TRMPBF?
For technical support, including LTC3308BEV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BEV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308BEV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BEV#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 LTC3308BEV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BEV#TRMPBF?
All LTC3308BEV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BEV#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 LTC3308BEV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308BEV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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