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Analog Devices Inc. LTC3308BIV#TRPBF
- Part No.:
- LTC3308BIV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BIV#TRPBF.pdf
- Description:
- IC REG BUCK 4A
- Quantity:
- Payment:
- Shipping:
Inventory:1,094
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Product details
Overview
LTC3308BIV#TRPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output at 500mV–VIN, operating from 2.25V–5.5V input with 6.6MHz default switching frequency, 22ns minimum on-time, and ±1% VFB accuracy. It integrates 8mΩ NMOS and 31mΩ PMOS power switches in a thermally enhanced 2mm × 2mm LQFN package, targeting FPGA core supplies and battery-powered POL systems.
For engineers reviewing the LTC3308BIV#TRPBF datasheet, LTC3308BIV#TRPBF pinout, LTC3308BIV#TRPBF application, or LTC3308BIV#TRPBF equivalent, key selection criteria include its 3–10MHz programmable frequency range, Burst Mode operation with 40µA IQ, Silent Switcher EMI reduction, forced continuous/pulse-skipping mode flexibility, and AEC-Q100-qualified industrial temperature grade (–40°C to +125°C).
Technical Context
The LTC3308BIV#TRPBF uses constant-frequency peak current mode control with internal compensation and auto-adapted slope compensation during external clock synchronization. Its architecture supports three distinct light-load modes-forced continuous (fixed-frequency, reverse inductor current), pulse-skipping (clock-aligned, zero reverse current), and Burst Mode (low-IQ, low-ripple sleep/wake cycles)-each selected via MODE/SYNC pin voltage level.
It features dual current limiting: peak switch current (6.4A typical) for overload protection and valley current (5.2A typical) for short-circuit recovery, plus output overvoltage protection triggered at 110% VOUT with 120µs delay, and thermal shutdown at 165°C. The 100% duty cycle capability enables ultra-low dropout operation near VIN ≈ VOUT.
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 - sufficient for FPGA core, ASIC I/O, or microprocessor VDD domains. |
| fSW Range | 3MHz to 10MHz - enables use of sub-220nH inductors and 0201/0402 ceramic capacitors for ultra-compact layouts. |
| tON,min | 22ns - allows stable 1.8V output from 5.5V input at 10MHz, supporting high step-down ratios at high frequency. |
| VFB Accuracy | ±1% over –40°C to +125°C - ensures tight output regulation across automotive and industrial ambient conditions. |
| IQ (Burst) | 40µA - extends battery runtime in always-on sensor nodes or low-power standby subsystems. |
| Thermal Range | –40°C to +125°C junction - qualified per AEC-Q100 Grade I, suitable for under-hood and industrial control environments. |
| EMI Performance | Silent Switcher architecture - reduces radiated emissions by >20dB vs conventional buck converters, easing EMC compliance. |
Pinout & Package
The LTC3308BIV#TRPBF is housed in a 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for optimal thermal dissipation (θJA = 51°C/W). All pins are surface-mount compatible and require controlled-impedance PCB layout per Analog Devices' layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB; must connect directly to output capacitor negative terminal and serve as RT/FB bypass reference. |
| 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 high-current paths for internal circuitry and top switch; requires parallel low-ESR ceramic bypassing to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Return path for bottom switch and primary thermal conduction path; exposed pad must be soldered to large PCB ground plane with ≥6 vias. |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to external inductor; requires shortest possible trace with minimal loop area. |
| MODE/SYNC (9) | Mode select & sync input | Configures light-load behavior (low = pulse-skip, float = forced continuous, high = Burst Mode) or 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 status indicator | Open-drain output asserting high when VOUT is within –2%/+10% window; includes 120µs delay and OV/UV fault reporting. |
| FB (12) | Feedback input | Regulates VOUT by holding 500mV at this pin; connects to resistor divider between VOUT and AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-small solution size | Enables full 4A POL regulator with <2mm × 2mm footprint using 150nH inductor and 0201/0402 capacitors. |
| Silent Switcher EMI reduction | Minimizes conducted/radiated noise through balanced SW node layout and integrated input caps, reducing need for ferrite beads or shielding. |
| Three selectable light-load modes | Engineers choose trade-off between ripple (forced continuous), efficiency (Burst Mode), or EMI (pulse-skip) without changing hardware. |
| Robust protection suite | Includes overvoltage lockout (110% VOUT), thermal shutdown (165°C), short-circuit recovery (valley current limit), and safe inductor saturation tolerance. |
| 100% duty cycle operation | Maintains regulation down to VIN – VOUT ≈ ILOAD × RDS(ON), critical for low-dropout applications like post-regulation of buck-boost outputs. |
| AEC-Q100 qualification | Validated for automotive Grade I (–40°C to +125°C), enabling use in ADAS camera modules, infotainment SoC rails, and body control units. |
Applications
| Optical Networking Power Rails | FPGA Core Voltage Supply |
|---|---|
Use Scenario: Providing clean, low-noise 1.2V/1.8V rails for SerDes transceivers and DSPs in 100G/400G optical line cards. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response to handle bursty data traffic-induced load steps. Use Value: 22ns minimum on-time and 6.6MHz switching enable <5µs load-step recovery while Silent Switcher architecture meets stringent EN55032 Class B emissions limits. | Use Scenario: Delivering tightly regulated 0.85V core voltage to Xilinx Versal or Intel Agilex FPGAs with dynamic current demands up to 4A. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with internal compensation and soft-start for reliable power-up sequencing. Use Value: ±1% VFB accuracy and 100% duty cycle support stable operation during FPGA configuration and partial reconfiguration events. |
| Automotive Camera Module Power | Industrial IoT Sensor Hub |
Use Scenario: Generating 3.3V and 1.8V supplies for image sensors, ISP processors, and MIPI interfaces in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: AEC-Q100 qualified DC/DC converter handling wide input transients (load dump, cold crank) and operating across –40°C to +125°C. Use Value: 2.25V minimum input supports start-stop battery operation; Burst Mode delivers 40µA IQ for parking-mode vision systems. | Use Scenario: Powering ARM Cortex-M7 microcontrollers, LoRaWAN radios, and environmental sensors in edge gateways deployed in factory settings. IC Role / Device Role / Timing Role: Compact, thermally robust POL regulator interfacing with 3.3V or 5V backplanes in space-constrained DIN-rail enclosures. Use Value: 2mm × 2mm LQFN package with exposed PGND pad achieves <51°C/W θJA, enabling 4A output without heatsinks in 70°C ambient. |
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#TRPBF | 3A rated, same pinout and feature set but lower current capability; 6mΩ/25mΩ FETs; 2.5V–5.5V input. | Lower output current margin; suitable where peak load ≤3A and board space reuse is critical. | Select when system load never exceeds 3A and cost optimization is prioritized over headroom. |
| TPS62864DRLR | 4A, 2.7V–6V input, 1.8V–5.5V output; 2.5MHz fixed frequency; no Burst Mode; smaller 1.5mm × 2.0mm QFN. | Lacks Silent Switcher EMI performance and programmable frequency; no AEC-Q100 qualification. | Prefer for non-automotive consumer applications where EMI is less constrained and fixed 2.5MHz simplifies design. |
Compared with LTC3307EDE#TRPBF and TPS62864DRLR, the LTC3308BIV#TRPBF provides higher current headroom, superior EMI performance via Silent Switcher, and automotive-grade reliability-making it optimal for demanding FPGA, optical, and automotive POL applications where compact size, low noise, and wide temperature operation are essential.
Availability
LTC3308BIV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, optical networking power rails, and automotive camera module designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LTC3308BIV#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 industrial, automotive, communications, and healthcare markets.
The LTC3308BIV#TRPBF belongs to the Silent Switcher µModule and monolithic DC/DC converter product line, engineered for ultra-compact, low-EMI point-of-load regulation in space- and noise-sensitive applications such as high-speed data converters, optical transceivers, and ADAS systems.
FAQ
What is the maximum output current capability of the LTC3308BIV#TRPBF?
The LTC3308BIV#TRPBF delivers up to 4A continuous output current under typical thermal conditions (TJ ≤ 125°C) with proper PCB layout including the exposed PGND pad connected to a large ground plane. Peak current limit is 6.4A typical, but sustained 4A operation requires adequate copper area and airflow per the thermal design guidelines in the datasheet. Derating applies above 85°C ambient.
Does the LTC3308BIV#TRPBF support external clock synchronization?
Yes, the LTC3308BIV#TRPBF supports external clock synchronization via the MODE/SYNC pin, accepting square wave inputs from 3MHz to 10MHz with ≥40ns high/low pulse widths and logic levels of 0.4V (low) and 1.2V (high). During synchronization, the device operates in forced continuous mode with auto-adapted slope compensation, ensuring stable regulation across the full frequency range.
How does the Burst Mode operation of the LTC3308BIV#TRPBF reduce quiescent current?
In Burst Mode operation, the LTC3308BIV#TRPBF charges the output capacitor slightly above the regulation voltage, then enters a low-power sleep state where most internal circuitry is powered down. This reduces input quiescent current to 40µA typical. When VOUT droops below the regulation threshold, the controller wakes and delivers a burst of switching cycles until regulation is restored-ideal for battery-powered standby functions.
What is the purpose of the AGND pin on the LTC3308BIV#TRPBF?
AGND (Pin 1) serves as the remote voltage sense return for the feedback network and the ground reference for all internal analog circuitry-including the error amplifier, oscillator, and soft-start ramp generator. It must be connected directly to the negative terminal of the output capacitor at the load, not to the main PGND plane, to reject PCB trace IR drops and ensure accurate output voltage regulation.
Can the LTC3308BIV#TRPBF operate with an input voltage as low as 2.25V?
Yes, the LTC3308BIV#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, the internal PMOS RDS(ON) increases, so thermal design must account for higher conduction losses. The 22ns minimum on-time and 100% duty cycle capability allow stable regulation even when VIN approaches VOUT, making it suitable for single-cell Li-ion and energy-harvesting applications.
LTC3308BIV#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)
LTC3308BIV#TRPBF FAQ
1.How can I place an order for LTC3308BIV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BIV#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 LTC3308BIV#TRPBF reliable?
The price and inventory of LTC3308BIV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BIV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BIV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BIV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BIV#TRPBF?
LTC3308BIV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BIV#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 LTC3308BIV#TRPBF?
For technical support, including LTC3308BIV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BIV#TRPBF requirements.
6.How does Aetrix verify that LTC3308BIV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BIV#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 LTC3308BIV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BIV#TRPBF?
All LTC3308BIV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BIV#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 LTC3308BIV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308BIV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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