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Analog Devices Inc. LTC3308AJV#TRPBF
- Part No.:
- LTC3308AJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AJV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,754
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Product details
Overview
LTC3308AJV#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 adjustable output, ±1% VFB accuracy, and 22ns minimum on-time. It employs peak current mode control, Silent Switcher architecture for ultralow EMI, and supports forced continuous, pulse-skip, or Burst Mode operation-ideal for automotive infotainment power rails and FPGA core supplies requiring high efficiency at light loads.
For engineers reviewing the LTC3308AJV#TRPBF datasheet, LTC3308AJV#TRPBF pinout, LTC3308AJV#TRPBF application, or LTC3308AJV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualification (–40°C to +150°C junction), 2mm × 2mm LQFN-12 package with exposed PGND pad, programmable 1MHz–3MHz switching frequency, and integrated overvoltage, short-circuit, and thermal protection.
Technical Context
The LTC3308AJV#TRPBF uses constant-frequency peak current mode control with internal slope compensation, enabling fast transient response and stable regulation across wide load and input ranges. Its dual MOSFET power stage features 31mΩ PMOS and 8mΩ NMOS switches, supporting up to 100% duty cycle for low-dropout operation and safe inductor saturation tolerance during overload.
Mode selection is controlled via the MODE/SYNC pin: grounded for pulse-skip, floating for forced continuous, or tied to VIN for Burst Mode (40µA IQ). The RT pin sets switching frequency from 1MHz to 3MHz using an external resistor, while synchronization to external clocks within that range is supported with automatic slope compensation adaptation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and 3.3V/5V system rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct 1.2V FPGA core, 0.8V ASIC, or 3.3V I/O supply generation. |
| Output Accuracy | ±1% over temperature - ensures stable voltage reference for precision analog or digital logic domains. |
| Switching Frequency | 1MHz to 3MHz - allows compact 0402/0201 passive selection and minimizes solution footprint. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on automotive sensors or telematics modules. |
| Thermal Rating | Junction temp up to +150°C - qualified per AEC-Q100 Grade J for under-hood automotive applications. |
Pinout & Package
The LTC3308AJV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) soldered to PCB ground plane for low θJA = 51°C/W and robust thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to output capacitor negative terminal for accurate regulation. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing via resistor divider from upstream rail. |
| VIN (3,8) | Main input power supply | Dual pins reduce IR drop and inductance; require parallel routing and local 4.7µF ceramic bypass to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Primary return path for bottom switch; exposed pad (13) must be connected to large PCB ground plane with ≥6 vias. |
| SW (5,6) | Switch node | High dv/dt node connecting internal FETs to inductor; requires short, wide copper trace to minimize EMI and ringing. |
| MODE/SYNC (9) | Operating mode control | Configures pulse-skip (GND), forced continuous (float), or Burst Mode (VIN); also accepts 1–3MHz external clock. |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; open or tied to VIN selects default ~2MHz operation. |
| PGOOD (11) | Power status indicator | Open-drain output pulled low if VOUT < 97% or > 110% of target, or during EN low/VIN UVLO/thermal shutdown. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider between VOUT and AGND to set output voltage precisely. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters-meets CISPR 22 Class B without shielding. |
| Burst Mode® operation | Delivers 90%+ efficiency at 1mA load with 40µA quiescent current-critical for always-on automotive ECUs. |
| 100% duty cycle capability | Enables dropout operation down to VIN – VOUT ≈ 120mV (at 4A), supporting brownout resilience in 12V systems. |
| AEC-Q100 Grade J qualification | Guaranteed operation from –40°C to +150°C junction temperature-valid for engine control, ADAS camera modules. |
| Integrated protection suite | Includes output overvoltage lockout (110% VOUT), valley-current limiting, thermal shutdown, and short-circuit recovery. |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering SoC and display controller in head-unit systems with wide input transients (cold crank, load dump). IC Role / Device Role / Timing Role: Primary 1.2V/4A POL regulator with fast transient response to handle bursty GPU/DSP loads. Use Value: Silent Switcher EMI suppression avoids interference with AM/FM radio reception; AEC-Q100 J-grade ensures reliability at under-dash temperatures. |
Use Scenario: Delivering tightly regulated 0.85V core voltage to Xilinx Artix-7 FPGA during configuration and active logic states. IC Role / Device Role / Timing Role: High-accuracy, low-noise buck converter with soft-start and PGOOD signaling for FPGA power sequencing. Use Value: ±1% VFB accuracy and 22ns min on-time enable stable 0.85V generation from 3.3V rail; Burst Mode extends standby battery life. |
| Optical Networking Line Card | Industrial IoT Sensor Hub |
|
Use Scenario: Generating 3.3V/2A bias for SFP+ transceivers and 1.2V/1.5A for SerDes PHYs in compact line cards. IC Role / Device Role / Timing Role: Dual-output-capable POL regulator (with external feedback resistors) meeting tight ripple and transient specs. Use Value: 2MHz switching enables use of 330nH shielded inductors and 22µF X5R ceramics-reducing board area by 40% vs legacy solutions. |
Use Scenario: Powering ARM Cortex-M7 MCU, BLE radio, and MEMS accelerometers in sealed, fanless edge nodes. IC Role / Device Role / Timing Role: Primary system regulator operating in Burst Mode to maintain µA-level sleep current while supporting 100ms wake-up bursts. Use Value: 40µA IQ in sleep and 92% peak efficiency at 100mA extend 2xAA battery life to >5 years; LQFN-12 eases automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3A rated, 4.5V–28V input, no Burst Mode, 1.2MHz fixed frequency, no SYNC pin. | Lacks AEC-Q100 qualification and low-IQ modes; suitable only for industrial non-automotive use. | Select when cost sensitivity outweighs EMI/efficiency requirements and input exceeds 5.5V. |
| TPS6286418RRLR | 4A rated, 2.7V–6V input, 1.8V fixed output, 2.2MHz, 18µA IQ, no programmable frequency. | Fixed 1.8V output limits flexibility; lacks Silent Switcher EMI reduction and AEC-Q100 J-grade. | Choose for space-constrained 1.8V-only applications where ultra-low IQ is critical but automotive qualification is not required. |
Compared with MP2315DJ-LF-Z and TPS6286418RRLR, the LTC3308AJV#TRPBF uniquely combines AEC-Q100 Grade J operation, Silent Switcher EMI performance, programmable 1–3MHz frequency, and true 0.5V–VIN output adjustability-making it the only option qualified for demanding automotive and optical networking POL designs.
Availability
LTC3308AJV#TRPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, optical networking line cards, and industrial IoT sensor hubs requiring stable component supply with full AEC-Q100 compliance and long-term lifecycle support.
Supply support for LTC3308AJV#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.
The LTC3308A product line delivers ultra-small, high-efficiency, low-EMI synchronous buck regulators for space- and noise-sensitive applications including automotive ADAS, optical transceivers, and portable medical devices.
FAQ
What is the maximum junction temperature rating for the LTC3308AJV#TRPBF?
The LTC3308AJV#TRPBF is specified for operation up to +150°C junction temperature and is AEC-Q100 qualified for Grade J automotive applications. This rating is confirmed in the Absolute Maximum Ratings table (Page 2) and Operating Junction Temperature Range note (Page 4), where LTC3308AJ devices are explicitly guaranteed over –40°C to +150°C.
Does the LTC3308AJV#TRPBF support external clock synchronization?
Yes, the LTC3308AJV#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven with a 1MHz–3MHz square wave, the internal PLL locks to the external frequency, and the device operates in forced continuous mode with automatically adapted slope compensation-details are in the "Synchronizing the Oscillator to an External Clock" section (Page 12).
What is the typical feedback voltage accuracy of the LTC3308AJV#TRPBF over temperature?
The LTC3308AJV#TRPBF maintains ±1% regulated feedback voltage (VFB) over the full –40°C to +150°C junction temperature range, as specified in the Electrical Characteristics table (Page 3) under "Regulated Feedback Voltage (VFB)" with the "l" symbol denoting guaranteed operation across temperature.
How does the LTC3308AJV#TRPBF implement short-circuit protection?
The LTC3308AJV#TRPBF uses dual current limiting: peak current limit (6.4A typical) prevents top-switch overcurrent, while valley current limit (5.2A typical) detects sustained bottom-switch conduction during output short. If valley current exceeds the limit, switching cycles are skipped until current decays-described in Applications Information (Page 13).
Can the LTC3308AJV#TRPBF operate with a 2.25V input supply?
Yes, the LTC3308AJV#TRPBF is fully specified to operate from 2.25V input, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables (Pages 2 and 3). At this minimum VIN, the device sustains 4A output with proper thermal design-confirmed in the Low Supply Operation section (Page 13) and Typical Performance plots (Page 7).
LTC3308AJV#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AJV#TRPBF FAQ
1.How can I place an order for LTC3308AJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AJV#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 LTC3308AJV#TRPBF reliable?
The price and inventory of LTC3308AJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AJV#TRPBF?
LTC3308AJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AJV#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 LTC3308AJV#TRPBF?
For technical support, including LTC3308AJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AJV#TRPBF requirements.
6.How does Aetrix verify that LTC3308AJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AJV#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 LTC3308AJV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AJV#TRPBF?
All LTC3308AJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AJV#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 LTC3308AJV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308AJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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