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Analog Devices Inc. LTC3308AIV#TRPBF
- Part No.:
- LTC3308AIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AIV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,206
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Product details
Overview
LTC3308AIV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output current, operating from 2.25V to 5.5V input, regulating down to 0.5V with ±1% VFB accuracy, and featuring Silent Switcher architecture for ultralow EMI in optical networking power supplies.
For engineers reviewing the LTC3308AIV#TRPBF datasheet, LTC3308AIV#TRPBF pinout, LTC3308AIV#TRPBF application, or LTC3308AIV#TRPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode operation, and thermally enhanced 2mm × 2mm LQFN package with exposed PGND pad.
Technical Context
The LTC3308AIV#TRPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation across wide load and input ranges. Its dual-MOSFET power stage integrates an 8mΩ NMOS high-side switch and 31mΩ PMOS low-side switch, supporting up to 100% duty cycle for low-dropout operation.
Mode selection is controlled via the MODE/SYNC pin: grounded for pulse skip, floated for forced continuous, or tied to VIN for Burst Mode (IQ = 40µA). The RT pin sets oscillator frequency from 1MHz to 3MHz using an external resistor, while synchronization to external clocks is supported within the same range.
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 | 4A continuous - delivers full rated current with thermal derating only above 125°C junction temperature. |
| VOUT Accuracy | ±1% over temperature - ensures tight regulation for FPGA core, ASIC, and µP supply rails. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) with practical inductor values. |
| Switching Freq | 1MHz to 3MHz - allows compact magnetics and ceramic capacitors; default 2MHz reduces EMI and layout area. |
| Efficiency (Burst) | 90% at 1mA, 95% at 1A (3.3V→1.2V) - extends battery life in portable systems without compromising light-load ripple. |
| Thermal Package | 2mm × 2mm × 0.74mm LQFN with exposed PGND pad - θJA = 51°C/W enables 4A operation on 2-layer PCBs with minimal copper. |
Pinout & Package
The LTC3308AIV#TRPBF is housed in a thermally enhanced 12-lead LQFN package (2mm × 2mm × 0.74mm) with exposed PGND pad (Pin 13), requiring solder connection to PCB ground plane for optimal thermal and electrical 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 power-up sequencing when driven by upstream regulator output. |
| VIN (3, 8) | Main input power supply | Dual pins reduce trace inductance and resistive loss; require local 4.7µF ceramic bypass to PGND/AGND. |
| PGND (4, 7, 13) | Power ground return path | Primary thermal and current return for bottom switch; exposed pad (13) must be vias-connected to large internal/external ground planes. |
| SW (5, 6) | Switch node output | High dv/dt node connecting to inductor; pins must be shorted and routed with minimal loop area to suppress EMI. |
| MODE/SYNC (9) | Operating mode selector | Configures Burst Mode (VIN), forced continuous (float), or pulse skip (GND); also accepts 1–3MHz external clock for synchronization. |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; open or tied to VIN selects default ~2MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% of target; includes 120µs delay and OV/UV hysteresis. |
| FB (12) | Feedback voltage sense | Regulates to 500mV reference; connects to resistor divider between VOUT and AGND for precise output programming. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® Architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for metal shielding in space-constrained telecom modules. |
| Burst Mode® Operation | 40µA quiescent current with low-output-ripple sleep/wake cycling - maintains efficiency >85% down to 100µA load without audible noise. |
| 100% Duty Cycle Capability | Enables dropout operation as VIN approaches VOUT; sustains regulation during brownout conditions without output collapse. |
| Internal Compensation | Eliminates external compensation components; simplifies design and improves stability across all output capacitor ESR values and temperatures. |
| AEC-Q100 Qualified | Rated for automotive-grade reliability (–40°C to +125°C junction), including HTOL, temperature cycling, and ESD testing per AEC standards. |
Applications
| Optical Networking Power Supply | FPGA Core Voltage Rail |
|---|---|
Use Scenario: Providing clean, low-noise 1.2V/4A power to SFP+ transceiver ASICs in dense line cards where EMI must meet CISPR 32 Class B limits. IC Role / Device Role / Timing Role: Primary POL regulator with integrated MOSFETs, Silent Switcher EMI suppression, and PGOOD signaling for system health monitoring. Use Value: Achieves >93% efficiency at 2A while maintaining <10mVpp output ripple and passing conducted/radiated emissions without ferrite beads or shields. | Use Scenario: Delivering tightly regulated 0.85V core voltage to Xilinx Kintex-7 FPGA under dynamic load steps from 0.5A to 4A at 10A/µs slew rate. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck with 22ns min-on-time and fast transient response to prevent logic errors during configuration bursts. Use Value: Maintains VOUT within ±15mV window during 3A load steps due to peak current mode control and internal compensation. |
| Automotive ADAS Camera Module | Industrial IoT Sensor Hub |
Use Scenario: Powering 1.8V image signal processor and 3.3V interface in rear-view camera module operating across –40°C to +105°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 qualified DC/DC with thermal shutdown, output overvoltage protection, and robust short-circuit recovery. Use Value: Survives 12V cold-crank (4.5V min) and load dump (28V max) events; recovers from output shorts in <10ms without latch-off. | Use Scenario: Generating 3.3V/2A rail for ARM Cortex-M7 microcontroller, BLE radio, and analog sensor front-end in battery-backed edge node. IC Role / Device Role / Timing Role: Low-quiescent-current Buck converter with Burst Mode and precision enable threshold for wake-on-event power management. Use Value: Draws only 40µA in sleep state while maintaining VOUT regulation; enables >5-year battery life in periodic sensing applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864DLCR | 3A rating, 2.7–6V input, 1.8V min VOUT, 1.8MHz fixed freq, no MODE/SYNC pin | Lacks Burst Mode and external sync; lower current limit restricts use in 4A FPGA/core rails | Select when board space is critical and 3A suffices; avoid for >3.5A loads or EMI-sensitive optical systems. |
| MP2145GJ-Z | 4A rating, 2.5–5.5V input, 0.6V min VOUT, 2MHz fixed freq, no Silent Switcher | Higher EMI emissions require additional filtering; lacks programmable frequency and AEC-Q100 qualification | Acceptable for industrial non-automotive use where cost is prioritized over EMI certification and thermal margin. |
Compared with TPS62864DLCR and MP2145GJ-Z, the LTC3308AIV#TRPBF uniquely combines 4A capability, 22ns min-on-time, Silent Switcher EMI reduction, and AEC-Q100 qualification - making it the only choice for automotive ADAS and high-density telecom POL where size, noise, and reliability are co-constrained.
Availability
LTC3308AIV#TRPBF is available at Aetrix Electronics and suitable for optical networking power supplies, automotive ADAS camera modules, and industrial IoT sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3308AIV#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 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 LTC3308AIV#TRPBF belongs to Analog Devices' Power by Linear™ family of monolithic DC/DC regulators, engineered specifically for high-efficiency, low-EMI point-of-load conversion in space- and noise-constrained systems such as optical modules and automotive ECUs.
FAQ
What is the maximum junction temperature specification for the LTC3308AIV#TRPBF?
The LTC3308AIV#TRPBF is rated for operation up to +125°C junction temperature. It incorporates overtemperature protection that disables switching when die temperature reaches ~165°C and resumes operation once temperature falls to ~160°C. Thermal design must ensure TJ ≤ 125°C under worst-case load and ambient conditions using the provided θJA = 51°C/W value.
Does the LTC3308AIV#TRPBF support output voltages below 1V?
Yes, the LTC3308AIV#TRPBF regulates output voltages as low as 0.5V. Its internal 500mV feedback reference and ±1% VFB accuracy enable precise low-voltage rails such as 0.85V FPGA cores or 0.75V ASIC supplies. External resistor divider selection follows RA = RB × (VOUT/0.5V − 1), with 0.1% tolerance resistors recommended for best accuracy.
How does the MODE/SYNC pin configure operating modes on the LTC3308AIV#TRPBF?
The MODE/SYNC pin configures three distinct modes: grounding it enables pulse skip mode for low-noise operation; floating it selects forced continuous mode for fixed-frequency, minimal ripple performance; tying it to VIN activates Burst Mode for highest light-load efficiency (40µA IQ). It also accepts 1–3MHz external clocks for synchronization, forcing forced continuous mode during lock.
Can the LTC3308AIV#TRPBF be used in automotive applications?
Yes, the LTC3308AIV#TRPBF is AEC-Q100 qualified for automotive applications and rated for –40°C to +125°C operating junction temperature. It includes features essential for automotive use: output overvoltage protection, short-circuit recovery, thermal shutdown, and robust EN threshold hysteresis - making it suitable for ADAS camera modules, infotainment power rails, and body control units.
What is the purpose of the AGND pin on the LTC3308AIV#TRPBF?
The AGND pin on the LTC3308AIV#TRPBF 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 to reject PCB trace resistance and ensure accurate output voltage regulation - especially critical for low-voltage, high-current rails like FPGA cores.
LTC3308AIV#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)
LTC3308AIV#TRPBF FAQ
1.How can I place an order for LTC3308AIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AIV#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 LTC3308AIV#TRPBF reliable?
The price and inventory of LTC3308AIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AIV#TRPBF?
LTC3308AIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AIV#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 LTC3308AIV#TRPBF?
For technical support, including LTC3308AIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AIV#TRPBF requirements.
6.How does Aetrix verify that LTC3308AIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AIV#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 LTC3308AIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AIV#TRPBF?
All LTC3308AIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AIV#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 LTC3308AIV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308AIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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