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Analog Devices Inc. LTC3308AEV#TRPBF
- Part No.:
- LTC3308AEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
LTC3308AEV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output current with 2.25V–5.5V input range, 0.5V–VIN output range, and ±1% VFB accuracy. It employs peak current mode control, Silent Switcher architecture for ultralow EMI, and supports forced continuous, pulse-skip, or Burst Mode operation-ideal for compact, noise-sensitive power supplies in FPGA core rails and battery-powered systems.
For engineers reviewing the LTC3308AEV#TRPBF datasheet, LTC3308AEV#TRPBF pinout, LTC3308AEV#TRPBF application, or LTC3308AEV#TRPBF equivalent, key selection criteria include its 22ns minimum on-time, 1MHz–3MHz programmable switching frequency, 8mΩ NMOS / 31mΩ PMOS RDS(ON), thermal shutdown, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC3308AEV#TRPBF integrates dual MOSFETs (NMOS high-side, PMOS low-side) in a single 2mm × 2mm LQFN package and uses constant-frequency peak current mode control with internal compensation. Its 22ns minimum on-time enables high step-down ratios at high frequencies (e.g., 5V→1.2V at 2MHz), while the Silent Switcher architecture minimizes high-frequency EMI through symmetrical layout and integrated hot-loop capacitors.
Mode selection is controlled via the MODE/SYNC pin: grounded for pulse-skip, tied to VIN for Burst Mode (40µA IQ), or floating for forced continuous operation. Clock synchronization (1MHz–3MHz) and RT-resistor programming allow precise frequency tuning without external loop compensation.
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 regulation of sub-1V FPGA/ASIC cores with no external reference. |
| Output Accuracy | ±1% over temperature - ensures stable voltage under thermal stress in automotive and industrial environments. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-locked) - allows small 220nH–470nH inductors and <10µF ceramic output caps. |
| Min On-Time | 22ns (typ.) - enables 5V→0.6V conversion at 2MHz without duty-cycle limitation. |
| RDS(ON) | 8mΩ (NMOS), 31mΩ (PMOS) - reduces conduction loss at 4A load, supporting >90% efficiency at 3.3V→1.2V/2A. |
| IQ (Burst Mode) | 40µA - extends battery runtime in always-on IoT sensors and wearables during light-load sleep cycles. |
Pinout & Package
The LTC3308AEV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for low θJA = 51°C/W. All pins are surface-mount compatible and require soldering the exposed pad to a large PCB ground plane via ≥6 thermal vias.
| 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 input | 400mV precision threshold with hysteresis; enables power sequencing with resistor dividers from upstream rails. |
| VIN (3, 8) | Main input supply | Dual high-current paths for internal circuitry and NMOS gate drive; requires parallel low-ESR ceramic bypassing to PGND/AGND. |
| PGND (4, 7, 13) | Power ground return | Low-inductance path for bottom switch current; exposed pad is primary thermal path-must be soldered to solid ground plane. |
| SW (5, 6) | Switch node | High dv/dt node connecting internal MOSFETs to inductor; requires short, wide trace to minimize ringing and EMI. |
| MODE/SYNC (9) | Mode control & clock sync | Selects Burst/Pulse-Skip/Forced Continuous modes or accepts 1–3MHz external clock for system-wide timing alignment. |
| RT (10) | Frequency set resistor | Connects to AGND with 20kΩ–75kΩ resistor to program fSW; open or tied to VIN defaults to ~2MHz. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% window; includes 120µs delay and OV/UV fault detection. |
| FB (12) | Feedback input | Senses 0.5V reference; connects to resistor divider from VOUT to AGND to set output voltage with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters-enables compliance with CISPR 22 Class B without shielding. |
| 100% duty cycle operation | Supports dropout regulation down to VIN – VOUT ≈ 150mV (at 4A), critical for brownout survival in automotive start-stop systems. |
| Inductor saturation tolerance | Safe operation even if inductor saturates during overload-prevents catastrophic failure in POL applications with transient surges. |
| Internal compensation | Eliminates external Type-II/III compensation network-reduces BOM count and layout sensitivity for rapid design-in. |
| AEC-Q100 Grade E | Qualified for –40°C to +125°C junction operation with lifetime validation per automotive reliability standards. |
Applications
| FPGA Core Supply | Automotive ADAS Camera Module |
|---|---|
|
Use Scenario: Powering Xilinx Artix-7 FPGA core rail requiring 1.2V @ 3A with <10mV ripple and fast load transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with internal compensation and 22ns min on-time enabling 2MHz switching for minimal output capacitance. Use Value: Achieves 92% efficiency at 3.3V→1.2V/3A while maintaining <20mV undershoot during 1A/µs load steps-reducing need for bulk capacitance and board area. |
Use Scenario: Generating 1.8V supply for Sony IMX490 image sensor in rear-view camera with strict EMI limits and -40°C cold-crank operation. IC Role / Device Role / Timing Role: AEC-Q100 qualified step-down converter operating in Burst Mode (40µA IQ) during vehicle sleep, synchronized to system clock via MODE/SYNC pin. Use Value: Meets CISPR 25 Class 5 radiated emissions without ferrite beads; maintains regulation down to 2.4V input during cold-crank events. |
| Optical Networking SFP+ Transceiver | Industrial PLC I/O Module |
|
Use Scenario: Providing 3.3V/2A bias for SFP+ CDR and laser driver ICs in compact pluggable modules with limited airflow. IC Role / Device Role / Timing Role: High-efficiency, low-noise POL regulator using forced continuous mode to suppress switching artifacts near sensitive analog receivers. Use Value: Delivers <5mVpp output ripple at 2A load and 2MHz fSW, eliminating need for post-regulator LDOs and saving 150mW dissipation. |
Use Scenario: Generating isolated 5V/1A auxiliary rail for microcontroller and CAN transceiver in DIN-rail mounted PLC with wide ambient temperature swing. IC Role / Device Role / Timing Role: Robust DC/DC converter with overvoltage protection, thermal shutdown, and 125°C rated junction operation for uncooled enclosures. Use Value: Survives 150°C ambient via θJA=51°C/W and exposed-pad thermal path; PGOOD signal enables safe firmware reset on undervoltage events. |
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 output rating, identical pinout and feature set but lower current capability and 12mΩ/45mΩ RDS(ON). | Suitable for lower-power FPGA I/O banks or microcontrollers where 3A suffices and cost optimization is prioritized. | Select when load current ≤3A and footprint compatibility with LTC3308A is required-no PCB changes needed. |
| LTC3309EV#TRPBF | 6A output rating, same package and control architecture but higher current switches (5mΩ/25mΩ) and adjusted current limit thresholds. | Required for high-performance SoC applications (e.g., NXP i.MX8) demanding >4.5A at 1V with tight thermal constraints. | Choose for future-proofing or higher-current derivatives-shares layout and firmware but requires validation of inductor saturation margin. |
Compared with LTC3307EV#TRPBF and LTC3309EV#TRPBF, the LTC3308AEV#TRPBF delivers optimal balance of 4A capability, 2mm² footprint, and ultralow EMI-making it the preferred choice for space-constrained, noise-sensitive 3–4A POL designs where neither 3A nor 6A variants fully meet requirements.
Availability
LTC3308AEV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS modules, and optical networking equipment requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.
Supply support for LTC3308AEV#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 LTC3308A belongs to Analog Devices' Silent Switcher µModule and monolithic DC/DC product line, engineered for ultra-low EMI, high efficiency, and minimal external components in space-constrained power delivery networks.
FAQ
What is the maximum output current capability of the LTC3308AEV#TRPBF?
The LTC3308AEV#TRPBF delivers up to 4A continuous output current under typical conditions (TA ≤ 85°C, 2-layer PCB, proper thermal layout). Its peak current limit is 6.4A (typ.), and valley current limit is 5.2A (typ.), ensuring robust overload handling. Derating applies above 85°C ambient or with insufficient copper area on the PGND pad.
Does the LTC3308AEV#TRPBF require external compensation components?
No, the LTC3308AEV#TRPBF features fully internal compensation-no external Type-II or Type-III network is needed. This simplifies layout, reduces BOM count, and eliminates stability tuning. The device achieves phase margin >60° across all operating conditions with only the FB resistor divider and standard input/output capacitors.
How does the MODE/SYNC pin configure operating modes on the LTC3308AEV#TRPBF?
The MODE/SYNC pin selects three distinct modes: grounded → pulse-skip mode (low-noise, fixed-frequency); tied to VIN → Burst Mode (40µA IQ, ideal for battery life); floating → forced continuous mode (best transient response, lowest ripple). When driven by an external 1–3MHz square wave, it synchronizes switching and forces continuous mode.
What package type and thermal performance does the LTC3308AEV#TRPBF use?
The LTC3308AEV#TRPBF uses a 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13). Its thermal resistance is θJA = 51°C/W (JEDEC 2S2P board), θJB = 12°C/W, and ΨJT = 0.6°C/W-enabling 4A operation without heatsinks when the exposed pad is soldered to ≥1cm² internal ground plane with ≥6 thermal vias.
Is the LTC3308AEV#TRPBF qualified for automotive applications?
Yes, the LTC3308AEV#TRPBF is AEC-Q100 Grade E qualified (–40°C to +125°C operating junction temperature) and manufactured under automotive-grade process controls. It includes overtemperature protection (trip at 165°C), output overvoltage lockout, and robust ESD tolerance-meeting requirements for infotainment, ADAS, and body electronics.
LTC3308AEV#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 1MHz ~ 3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AEV#TRPBF FAQ
1.How can I place an order for LTC3308AEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AEV#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 LTC3308AEV#TRPBF reliable?
The price and inventory of LTC3308AEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AEV#TRPBF?
LTC3308AEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AEV#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 LTC3308AEV#TRPBF?
For technical support, including LTC3308AEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AEV#TRPBF requirements.
6.How does Aetrix verify that LTC3308AEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AEV#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 LTC3308AEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AEV#TRPBF?
All LTC3308AEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AEV#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 LTC3308AEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308AEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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