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Analog Devices Inc. LTC3308BEV#TRPBF
- Part No.:
- LTC3308BEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BEV#TRPBF.pdf
- Description:
- IC REG BUCK 4A
- Quantity:
- Payment:
- Shipping:
Inventory:3,176
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Product details
Overview
LTC3308BEV#TRPBF 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® EMI reduction - deployed in FPGA core supplies and compact POL systems.
For engineers reviewing the LTC3308BEV#TRPBF datasheet, LTC3308BEV#TRPBF pinout, LTC3308BEV#TRPBF application, or LTC3308BEV#TRPBF equivalent, key selection criteria include its 2mm × 2mm LQFN package, programmable 3–10MHz frequency, forced continuous/Burst Mode operation, 0.5V feedback reference, and automotive-grade thermal range (–40°C to +125°C).
Technical Context
The LTC3308BEV#TRPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop tuning. Its architecture supports three operating modes-forced continuous, pulse-skipping, and low-ripple Burst Mode-with MODE/SYNC pin configuration determining light-load behavior and noise profile.
It integrates dual power MOSFETs (8mΩ NMOS, 31mΩ PMOS), supports clock synchronization via MODE/SYNC (3–10MHz), and features precision enable threshold (400mV), output overvoltage protection (110% VOUT), and thermal shutdown at 165°C - all within a thermally enhanced 12-lead LQFN with exposed PGND pad.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single Li-ion or 3.3V/5V rails without pre-regulation |
| IOUT Max | 4A continuous - sufficient for FPGA, ASIC, and microprocessor core supplies |
| fSW Range | 3MHz to 10MHz - allows ultra-small inductors (e.g., 150nH) and ceramic capacitors |
| tON,min | 22ns - supports high step-down ratios (e.g., 5.5V → 0.5V) at 10MHz without duty-cycle limitation |
| VFB Accuracy | ±1% over temperature - ensures stable 0.5V reference for precise output voltage setting |
| IQ (Burst Mode) | 40µA - extends battery life in always-on, low-duty-cycle applications |
| Thermal Range | –40°C to +125°C junction - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed PGND pad (Pin 13), optimized for low θJA = 51°C/W and high-current thermal dissipation.
| 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 VIN for always-on or resistor divider for sequenced startup |
| VIN (3,8) | Main power input | Dual pins reduce IR drop and thermal stress; bypass separately to PGND and AGND with low-ESR ceramics |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path and low-inductance return for bottom switch; requires ≥6 vias to inner ground plane |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to inductor; must use short, wide copper pour to minimize EMI and ringing |
| MODE/SYNC (9) | Mode select & sync input | Configures Burst Mode (VIN), pulse-skip (GND), or forced continuous (float); accepts 3–10MHz external clock |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 3–10MHz; tied to VIN for default 6.6MHz operation |
| 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 | Regulates to 0.5V reference; connects to resistor divider from VOUT to set output voltage (e.g., 1.8V = 500mV × (RA/RB + 1)) |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB vs conventional buck converters - eliminates need for metal shielding in space-constrained designs |
| Low-ripple Burst Mode® | Delivers 40µA quiescent current with <10mVPP output ripple at light loads - ideal for battery-powered IoT sensors and always-on subsystems |
| 100% duty cycle capability | Enables dropout operation down to VIN – ILOAD × RDS(ON) - maintains regulation during brownout or low-input conditions |
| Internal compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity while maintaining stability across 0.5V–5.5V VOUT |
| AEC-Q100 qualification | Validated for automotive applications (Grade E: –40°C to +125°C) - supports infotainment, ADAS domain controllers, and telematics modules |
Applications
| FPGA Core Supply | Automotive Infotainment SoC |
|---|---|
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA core rails requiring tight voltage tolerance and fast load transient response. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V synchronous buck regulator with internal compensation and soft-start. Use Value: 22ns minimum on-time enables stable 1.2V output from 3.3V input at 6.6MHz, reducing solution size by 40% vs legacy 2.25MHz converters. |
Use Scenario: Generating 1.1V core voltage for NXP i.MX8M Plus in automotive head units with stringent EMI limits. IC Role / Device Role / Timing Role: AEC-Q100-compliant POL regulator with Burst Mode for standby and forced continuous for active processing. Use Value: Silent Switcher® meets CISPR-25 Class 5 radiated emissions without ferrite beads or shielded inductors - simplifying EMC validation. |
| Optical Network Line Card | Industrial PLC I/O Module |
Use Scenario: Providing 3.3V/1.8V bias to SFP+ transceivers and SerDes PHYs in telecom line cards with limited board area. IC Role / Device Role / Timing Role: High-frequency (6.6MHz) step-down converter minimizing inductor footprint and input capacitance. Use Value: 2mm × 2mm package and 150nH inductor allow full 3.3V rail generation in <12mm² PCB area - critical for dense optical module layouts. |
Use Scenario: Regulating 1.8V for ARM Cortex-M7 microcontroller and isolated ADCs in DIN-rail mounted PLCs operating at 85°C ambient. IC Role / Device Role / Timing Role: Thermally robust DC/DC with 125°C junction rating and integrated overtemperature protection. Use Value: Exposed PGND pad and θJA = 51°C/W enable 4A output at 85°C ambient without heatsink - reducing system cost and complexity. |
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 |
|---|---|---|---|
| MP2145GQ-Z | 3A max output, 2.5–5.5V input, fixed 3.3V/5V options only; no programmable frequency or Burst Mode | Limited to fixed-output applications; lacks remote sensing (AGND) and PGOOD | Select when cost-sensitive, fixed-VOUT designs require minimal external components |
| TPS6286418RRLR | 4A, 2.7–6V input, 1.8V fixed output; 2.5MHz default fSW; no MODE/SYNC pin or Silent Switcher | No EMI-optimized layout; lower frequency increases inductor size and slows transient response | Choose for TI ecosystem compatibility where EMI is less constrained and board area is less critical |
Compared with MP2145GQ-Z and TPS6286418RRLR, the LTC3308BEV#TRPBF offers superior EMI performance, wider input/output flexibility, and finer control over light-load efficiency - making it optimal for space- and noise-sensitive embedded systems demanding 4A at sub-2V outputs.
Availability
LTC3308BEV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive infotainment SoCs, and optical network line cards requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3308BEV#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 (now part of Analog Devices, Inc. following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3308B product line delivers ultra-compact, high-frequency synchronous buck regulators targeting space-constrained, noise-sensitive applications including portable electronics, automotive ADAS, and high-density telecom infrastructure.
FAQ
What is the maximum output current capability of the LTC3308BEV#TRPBF?
The LTC3308BEV#TRPBF delivers up to 4A continuous output current under typical thermal conditions (TA ≤ 85°C, 2-layer PCB with adequate copper pour). At higher ambient temperatures or with reduced airflow, derating applies per the thermal data: junction temperature must remain below 125°C for Grade E operation. The device includes valley current limiting (5.2A) and peak current limiting (6.4A typical) to protect against overload and short-circuit events.
Does the LTC3308BEV#TRPBF support output voltages below 1V?
Yes, the LTC3308BEV#TRPBF regulates output voltages as low as 0.5V using its precision 0.5V feedback reference. For example, a 0.8V output is achieved with RA = 60kΩ and RB = 100kΩ (VOUT = 0.5V × (1 + RA/RB)). The ±1% VFB accuracy and low-noise error amplifier ensure stable regulation even at sub-1V levels required by advanced logic cores and AI accelerators.
How does the MODE/SYNC pin configure operating modes on the LTC3308BEV#TRPBF?
The MODE/SYNC pin selects among three distinct modes: tie to GND for pulse-skipping mode (low noise, moderate efficiency), float for forced continuous mode (fixed frequency, lowest ripple), or tie to VIN for Burst Mode operation (40µA IQ, highest light-load efficiency). When driven by an external 3–10MHz square wave, the LTC3308BEV#TRPBF synchronizes its switching and operates in forced continuous mode with auto-adjusted slope compensation.
What thermal performance can be expected from the LTC3308BEV#TRPBF in a standard 2-layer PCB layout?
In a JEDEC-standard 2S2P PCB layout with 2oz copper and the exposed PGND pad soldered to an internal ground plane via ≥6 thermal vias, the LTC3308BEV#TRPBF achieves θJA = 51°C/W. At 4A output with 3.3V input and 1.8V output, power dissipation is ~0.4W - resulting in ~20°C rise above ambient. This enables full 4A operation at 85°C ambient without thermal throttling in most industrial and automotive applications.
Is the LTC3308BEV#TRPBF pin-compatible with other members of the LTC330x family?
Yes, the LTC3308BEV#TRPBF shares identical pinout and package (2mm × 2mm LQFN) with the LTC3307 (3A) and LTC3309 (6A), enabling scalable power design across current requirements. However, differences in current limits, RDS(ON), and thermal design margins mean PCB layout and inductor selection must be verified per specific variant - especially for thermal vias and input/output capacitor placement.
LTC3308BEV#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)
LTC3308BEV#TRPBF FAQ
1.How can I place an order for LTC3308BEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BEV#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 LTC3308BEV#TRPBF reliable?
The price and inventory of LTC3308BEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BEV#TRPBF?
LTC3308BEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BEV#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 LTC3308BEV#TRPBF?
For technical support, including LTC3308BEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BEV#TRPBF requirements.
6.How does Aetrix verify that LTC3308BEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BEV#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 LTC3308BEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BEV#TRPBF?
All LTC3308BEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BEV#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 LTC3308BEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308BEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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