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Analog Devices Inc. LTC3308AJV#TRMPBF
- Part No.:
- LTC3308AJV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AJV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:975
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Product details
Overview
LTC3308AJV#TRMPBF 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% feedback accuracy, and featuring Silent Switcher architecture for ultralow EMI in automotive-grade 150°C junction temperature operation.
For engineers reviewing the LTC3308AJV#TRMPBF datasheet, LTC3308AJV#TRMPBF pinout, LTC3308AJV#TRMPBF application, or LTC3308AJV#TRMPBF equivalent, key selection criteria include its 22ns minimum on-time, programmable 1–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode operation, and AEC-Q100 qualification for under-hood automotive power rails.
Technical Context
The LTC3308AJV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation across wide VIN–VOUT ratios. 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 (pulse skip at GND, Burst Mode at VIN, forced continuous when floating), while switching frequency is set either by an external RT resistor or synchronized to an external 1–3MHz clock. The device includes integrated overvoltage protection (107–114% VOUT threshold), thermal shutdown (TJ = 165°C), and soft-start (0.25–3ms duration).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and automotive 3.3V/5V rails without pre-regulation. |
| IOUT Max | 4A continuous - sufficient for FPGA core, ASIC I/O, or microprocessor power domains. |
| VOUT Accuracy | ±1% over temperature - ensures stable voltage reference for precision analog or digital logic supplies. |
| 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 bypass capacitors; default 2MHz reduces EMI filtering burden. |
| Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for engine control units and ADAS domain controllers. |
| IQ in Burst Mode | 40µA - extends battery life in always-on telematics or sensor nodes with light-load operation. |
Pinout & Package
The LTC3308AJV#TRMPBF 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) and robust thermal performance in space-constrained automotive PCBs.
| 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 sequencing with upstream regulators via resistor divider. |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance and IR drop; require local 4.7µF ceramic bypass to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal path; must be soldered to large PCB ground plane with ≥6 vias. |
| SW (5,6) | Switch node | High dv/dt node connecting internal MOSFETs to inductor; requires short, wide copper pour to minimize EMI. |
| MODE/SYNC (9) | Operating mode control | Configures pulse skip (GND), Burst Mode (VIN), or forced continuous (float); also accepts 1–3MHz sync clock. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 1–3MHz; 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 regulation; includes 120µs delay and OV/UV hysteresis. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider from VOUT to AGND to set output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for ferrite beads or metal shields in EMC-critical automotive modules. |
| Low-ripple Burst Mode® | Delivers 40µA quiescent current with <10mVpp output ripple at light loads-ideal for always-on infotainment standby rails. |
| 100% duty cycle capability | Enables dropout operation down to VIN – VOUT ≈ 80mV (at 4A), supporting brownout resilience in 12V automotive systems with large input transients. |
| Integrated protection suite | Includes output overvoltage lockout (110% VOUT), valley-current limiting (5.2A), thermal shutdown (165°C), and short-circuit recovery with soft-start restart. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with HTOL, TC, and ESD testing-meets functional safety requirements for ASIL-B automotive subsystems. |
Applications
| Automotive Engine Control Unit (ECU) | ADAS Camera Power Module |
|---|---|
Use Scenario: Regulating 5V input to 1.2V/4A for MCU core supply in under-hood ECU with ambient temperatures up to 125°C. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing low-noise, high-efficiency core voltage with AEC-Q100 compliance and thermal derating margin. Use Value: 150°C junction rating ensures reliability during prolonged high-temperature soak; Silent Switcher minimizes interference with CAN FD and LIN bus signals. |
Use Scenario: Generating 3.3V/2A from 5V for image sensor and ISP in rear-view camera module with strict EMI limits. IC Role / Device Role / Timing Role: Compact, low-EMI point-of-load regulator placed near sensor die to suppress switching noise coupling into analog pixel paths. Use Value: 22ns min on-time enables clean 3.3V generation from 5V at 2MHz; Burst Mode maintains <50µA IQ during video idle periods. |
| Industrial IoT Gateway | Automotive Infotainment SoC Core Rail |
Use Scenario: Powering ARM Cortex-A series processor in sealed industrial gateway operating continuously at 85°C ambient. IC Role / Device Role / Timing Role: High-density 4A buck converter delivering stable 1.1V core voltage with internal compensation and soft-start sequencing. Use Value: Forced continuous mode eliminates load-step-induced ripple; PGOOD signal coordinates system boot with FPGA configuration. |
Use Scenario: Supplying 0.85V/4A to application processor in head unit with dynamic DVFS and thermal throttling. IC Role / Device Role / Timing Role: Automotive-grade POL regulator supporting rapid voltage scaling via MODE/SYNC-controlled Burst/FC transitions. Use Value: Programmable frequency avoids AM band interference; 100% duty cycle sustains operation during cold-crank 6V dips. |
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 |
|---|---|---|---|
| TPS62864DLCR | 3A max output, 2.7–6V input, 10µA IQ in DCM, no AEC-Q100 rating, 1.5mm × 2.0mm WCSP package | Targeted at consumer portable devices; lacks automotive temp grade and EMI-hardened layout | Select when size and ultra-low IQ outweigh automotive qualification and 4A capability. |
| MP2174GQZ-P | 4A output, 2.8–18V input, 500kHz–2.2MHz fSW, no Burst Mode, 150°C junction rating, QFN-10 package | Higher VIN range suits 12V systems; lacks Silent Switcher EMI suppression and precise 400mV EN threshold | Select for wider input range and cost-sensitive industrial designs where EMI filtering is handled externally. |
Compared with TPS62864DLCR and MP2174GQZ-P, the LTC3308AJV#TRMPBF uniquely combines AEC-Q100 Grade 1 qualification, 4A output, Silent Switcher EMI reduction, and 22ns minimum on-time in a 2mm × 2mm footprint-making it optimal for space- and noise-constrained automotive core rails.
Availability
LTC3308AJV#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, industrial IoT gateways, and infotainment SoC core supplies requiring stable component supply with full AEC-Q100 traceability and long-term lifecycle support.
Supply support for LTC3308AJV#TRMPBF 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 precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3308A product line delivers ultra-small, high-efficiency, low-EMI synchronous buck converters for automotive and industrial point-of-load applications demanding AEC-Q100 qualification, wide temperature operation, and minimal board area.
FAQ
What is the maximum junction temperature rating for the LTC3308AJV#TRMPBF?
The LTC3308AJV#TRMPBF is rated for operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This rating is confirmed in the Absolute Maximum Ratings table (Page 2) and Operating Junction Temperature Range specification (Note 2, Page 4), where LTC3308AJ explicitly lists –40°C to +150°C. Thermal derating above 125°C is required per Analog Devices' lifetime guidelines.
Does the LTC3308AJV#TRMPBF support external clock synchronization?
Yes, the LTC3308AJV#TRMPBF supports external clock synchronization via the MODE/SYNC pin. When driven with a 1–3MHz square wave, the internal PLL locks to the external frequency, forcing operation in forced continuous mode with automatic slope compensation adaptation. This capability is documented in the "Synchronizing the Oscillator to an External Clock" section (Page 12) and Electrical Characteristics table (Page 3).
What is the typical feedback reference voltage for the LTC3308AJV#TRMPBF?
The LTC3308AJV#TRMPBF regulates the FB pin to a typical 500mV reference voltage, with guaranteed tolerance of ±1% over temperature (0.495V to 0.505V). This value is specified in the Electrical Characteristics table (Page 3) under "Regulated Feedback Voltage (VFB)" and used directly in output voltage calculation: VOUT = 0.5V × (1 + RA/RB).
How does the LTC3308AJV#TRMPBF handle output short-circuit conditions?
The LTC3308AJV#TRMPBF employs dual current limiting: peak current limit (6.4A typical) shuts off the top switch, while valley current limit (5.2A) holds off the top switch if bottom-switch current remains excessive. During sustained short-circuit, the device enters hiccup mode with thermal shutdown at 165°C and auto-recovery after cooldown. This behavior is detailed in the "Output Short-Circuit Protection and Recovery" section (Page 13).
Can the LTC3308AJV#TRMPBF operate with 100% duty cycle, and what is the practical dropout voltage?
Yes, the LTC3308AJV#TRMPBF supports 100% duty cycle operation, enabling dropout mode when VIN approaches VOUT. At 4A load, the practical dropout voltage is approximately VIN – VOUT ≈ 80mV, determined by the 8mΩ NMOS RDS(ON) and inductor DCR. This is confirmed in the "Dropout Operation" section (Page 12) and validated by efficiency curves showing stable regulation down to VIN = VOUT + 100mV.
LTC3308AJV#TRMPBF 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#TRMPBF FAQ
1.How can I place an order for LTC3308AJV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AJV#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC3308AJV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AJV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AJV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AJV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AJV#TRMPBF?
LTC3308AJV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AJV#TRMPBF 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#TRMPBF?
For technical support, including LTC3308AJV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AJV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308AJV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AJV#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AJV#TRMPBF?
All LTC3308AJV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AJV#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308AJV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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