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Analog Devices Inc. LTC3308AEV#TRMPBF
- Part No.:
- LTC3308AEV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AEV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:974
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Product details
Overview
LTC3308AEV#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 a thermally enhanced 2mm × 2mm LQFN package - ideal for space-constrained FPGA core supplies and battery-powered industrial systems.
For engineers reviewing the LTC3308AEV#TRMPBF datasheet, LTC3308AEV#TRMPBF pinout, LTC3308AEV#TRMPBF application, or LTC3308AEV#TRMPBF equivalent, key selection factors include its 22ns minimum on-time, programmable 1MHz–3MHz switching frequency, forced continuous/pulse-skip/Burst Mode™ operation, integrated 8mΩ NMOS / 31mΩ PMOS power switches, and AEC-Q100-qualified temperature range (–40°C to +125°C).
Technical Context
The LTC3308AEV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response and stable regulation across wide load and input ranges. Its architecture supports three selectable operating modes via the MODE/SYNC pin: forced continuous (fixed-frequency, low-ripple), pulse skip (light-load efficiency with aligned edges), and Burst Mode™ (40µA IQ, low-noise sleep cycles).
It integrates dual MOSFETs with matched timing, 100% duty cycle capability for ultra-low dropout, and comprehensive protection including output overvoltage (107–114% VOUT), short-circuit recovery with valley-current limiting, thermal shutdown (165°C trip), and precision enable threshold (400mV ±50mV hysteresis).
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 for sub-1V FPGA/ASIC cores and I/O supplies. |
| Output Accuracy | ±1% over temperature - ensures stable voltage margining for high-speed digital loads. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-locked) - allows optimization of size vs. efficiency and EMI filtering. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5V→0.6V at 2MHz) with practical inductor values. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery runtime in always-on IoT sensor nodes. |
| Thermal Rating | Junction temp –40°C to +125°C (LTC3308AE grade) - qualified for automotive cabin and industrial edge computing environments. |
Pinout & Package
The LTC3308AEV#TRMPBF is housed in a 12-lead, 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for low thermal resistance (θJA = 51°C/W). The package is RoHS-compliant and halogen-free.
| 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 minimize noise and improve regulation accuracy. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power sequencing when driven by upstream regulator's output divider. |
| VIN (3, 8) | Main input power supply | Dual pins reduce IR drop and parasitic inductance; require local 4.7µF ceramic bypass to PGND/AGND. |
| PGND (4, 7, 13) | Power ground return path | Primary thermal and electrical path; exposed pad (Pin 13) must be soldered to large PCB ground plane with ≥6 vias. |
| SW (5, 6) | Switch node | High dv/dt node connecting internal MOSFETs to external inductor; requires short, wide copper trace to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures light-load behavior (low = pulse skip, float = forced continuous, high = Burst Mode); accepts 1–3MHz external clock for system-level synchronization. |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; open or tied to VIN defaults to ~2MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output asserts high when VOUT is within –2%/+10% window; includes 120µs delay and hysteresis to reject transients. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider from VOUT to AGND; phase-lead cap optional for improved transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs. conventional buck converters - eliminates need for metal shielding in sensitive RF or medical applications. |
| Low-ripple Burst Mode™ operation | Delivers 40µA quiescent current while maintaining <10mVpp output ripple - enables always-on functionality in portable instrumentation. |
| 22ns minimum on-time | Enables 5V→0.6V conversion at 2MHz using standard 330nH inductors - reduces solution size versus larger-footprint alternatives. |
| Integrated 8mΩ NMOS / 31mΩ PMOS | Minimizes conduction loss at full 4A load - achieves >90% efficiency at 3.3V→1.2V/4A (2MHz) without external drivers or discrete FETs. |
| AEC-Q100 Grade E qualification | Validated for automotive cabin electronics (–40°C to +125°C junction) - supports infotainment, ADAS camera modules, and body control units. |
Applications
| Optical Networking Power Supply | FPGA Core Voltage Regulation |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 0.85V/3A supply to Xilinx Kintex-7 FPGA core in 10Gbps optical line cards. IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck regulator with remote sensing (AGND) and soft-start to prevent inrush into large FPGA decoupling banks. Use Value: 22ns min on-time enables 3.3V→0.85V conversion at 2MHz, reducing inductor size by 40% vs. legacy controllers; Burst Mode maintains <50µA standby draw during link idle. |
Use Scenario: Delivering 1.2V/4A to Intel Agilex FPGA fabric under dynamic load steps up to 3A/µs in edge AI inference accelerators. IC Role / Device Role / Timing Role: High-bandwidth, internally compensated buck with forced continuous mode to suppress output ripple during high-speed logic switching. Use Value: Peak current mode control + 51°C/W θJA enables stable 4A operation without airflow; PGOOD signals FPGA configuration readiness to host processor. |
| Battery-Powered Industrial Sensor Node | Automotive Camera Module Supply |
|
Use Scenario: Regulating 3.6V Li-ion battery to 1.8V/1.5A for ARM Cortex-M7 MCU and MEMS IMU in wireless condition monitoring devices. IC Role / Device Role / Timing Role: Low-IQ POL converter with programmable light-load mode and precise enable threshold for wake-on-event sequencing. Use Value: 40µA Burst Mode IQ extends 2000mAh battery life to >5 years in sleep; 400mV EN threshold allows direct connection to MCU GPIO for controlled startup. |
Use Scenario: Generating 1.1V/2.5A for Sony IMX415 image sensor and 2.8V/1A for CIS interface in rear-view camera ECU operating at 105°C ambient. IC Role / Device Role / Timing Role: AEC-Q100-qualified buck with thermal shutdown and overvoltage protection for ASIL-B functional safety compliance. Use Value: –40°C to +125°C junction rating and 165°C OT protection ensure reliability in under-hood mounting; Silent Switcher meets CISPR-25 Class 5 EMI limits. |
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 rated, 2.7V–6V VIN, fixed 1.8V output, no RT pin, smaller 1.5mm × 1.5mm DSBGA | Lacks programmable frequency, remote sensing (AGND), and Burst Mode - suited for cost-sensitive, fixed-output consumer apps only. | Select only if output voltage is fixed and board space is critical; not suitable for FPGA core or automotive use due to missing features and qualification. |
| LTC3307EDC#TRMPBF | 3A version, pin-compatible footprint, identical feature set except lower current rating and slightly higher RDS(ON) | Same Silent Switcher architecture and MODE/SYNC behavior - direct upgrade path when 4A headroom is unnecessary. | Choose for lower-power designs where thermal margin or BOM cost reduction outweighs need for 4A capability; shares layout and firmware compatibility. |
Compared with TPS62864DLCR and LTC3307EDC#TRMPBF, the LTC3308AEV#TRMPBF uniquely combines 4A capability, 22ns min on-time, AEC-Q100 qualification, and true remote sensing - making it the only option among the three for high-reliability, high-density POL in automotive and FPGA applications.
Availability
LTC3308AEV#TRMPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive camera modules, and battery-powered industrial sensor nodes requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100 compliance.
Supply support for LTC3308AEV#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3308A family delivers ultra-small, high-efficiency, low-EMI synchronous buck regulators targeting space- and noise-constrained applications such as optical networking, automotive ADAS, and portable instrumentation - emphasizing integration, thermal robustness, and system-level timing control.
FAQ
What is the operating temperature range for the LTC3308AEV#TRMPBF?
The LTC3308AEV#TRMPBF is the "E" grade variant, specified for a junction temperature range of –40°C to +125°C and qualified per AEC-Q100 for automotive cabin applications. Its thermal performance is enabled by the 2mm × 2mm LQFN package with exposed PGND pad and θJA = 51°C/W on a JEDEC 2S2P board.
Does the LTC3308AEV#TRMPBF support external clock synchronization?
Yes, the LTC3308AEV#TRMPBF supports external clock synchronization via its MODE/SYNC pin, accepting square-wave inputs from 1MHz to 3MHz. When synchronized, the device operates in forced continuous mode with automatic slope compensation adaptation - enabling deterministic timing in multi-rail systems.
How does the LTC3308AEV#TRMPBF achieve low EMI performance?
The LTC3308AEV#TRMPBF achieves ultralow EMI through Analog Devices' patented Silent Switcher® architecture, which employs symmetrical pin layouts, integrated input capacitors, and balanced power loops to cancel magnetic fields. This design reduces radiated emissions by >30dB compared to conventional buck converters without shielding.
What is the minimum output voltage supported by the LTC3308AEV#TRMPBF?
The LTC3308AEV#TRMPBF regulates output voltages as low as 0.5V, achieved by referencing the FB pin to an internal 500mV precision bandgap. Output voltage is set using a resistor divider (RA/RB) between VOUT and AGND, with RB typically selected between 40kΩ and 400kΩ for optimal accuracy.
Can the LTC3308AEV#TRMPBF operate in 100% duty cycle mode?
Yes, the LTC3308AEV#TRMPBF supports up to 100% duty cycle operation, allowing it to maintain regulation even when VIN approaches VOUT - critical for low-dropout scenarios like Li-ion battery discharge (e.g., 3.2V → 3.0V). In this mode, output voltage equals VIN minus the PMOS RDS(ON) × ILOAD drop.
LTC3308AEV#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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AEV#TRMPBF FAQ
1.How can I place an order for LTC3308AEV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AEV#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 LTC3308AEV#TRMPBF reliable?
The price and inventory of LTC3308AEV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AEV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AEV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AEV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AEV#TRMPBF?
LTC3308AEV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AEV#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 LTC3308AEV#TRMPBF?
For technical support, including LTC3308AEV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AEV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308AEV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AEV#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 LTC3308AEV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AEV#TRMPBF?
All LTC3308AEV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AEV#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 LTC3308AEV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308AEV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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