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Analog Devices Inc. LTC3308AIV#TRMPBF
- Part No.:
- LTC3308AIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
LTC3308AIV#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 output voltages as low as 0.5V with ±1% accuracy over temperature, and featuring Silent Switcher® architecture for ultralow EMI in optical networking and automotive power supplies.
For engineers reviewing the LTC3308AIV#TRMPBF datasheet, LTC3308AIV#TRMPBF pinout, LTC3308AIV#TRMPBF application, or LTC3308AIV#TRMPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and switching performance, and real-world mode-selection trade-offs for battery-powered and POL systems.
Technical Context
The LTC3308AIV#TRMPBF uses constant-frequency peak current mode control with programmable 1MHz–3MHz switching and 22ns minimum on-time, enabling fast transient response with small external components. Its integrated 31mΩ PMOS and 8mΩ NMOS power switches support up to 100% duty cycle for low-dropout operation.
Silent Switcher® architecture minimizes EMI emissions via symmetrical layout and differential SW node routing. The device supports three selectable operating modes-Burst Mode® (40µA IQ), pulse skip, and forced continuous-via the MODE/SYNC pin, with internal compensation and soft-start eliminating external loop components.
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 intermediate bus rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct core supply for FPGA, ASIC, and µP requiring sub-1V rails. |
| Output Accuracy | ±1% over –40°C to +125°C - ensures stable regulation across automotive and industrial ambient extremes. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-synchronized) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Quiescent Current | 40µA in Burst Mode® sleep - extends battery life in always-on sensor nodes and portable devices. |
| Thermal Rating | Junction temp range –40°C to +125°C (I-grade) - qualified for under-hood automotive and high-density server applications. |
| Protection Features | Output overvoltage, short-circuit, thermal shutdown, and reverse inductor current limiting - enables robust operation without external fault management circuitry. |
Pinout & Package
The LTC3308AIV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) for low thermal resistance (θJA = 51°C/W). PCB layout requires direct connection of the exposed pad to a large ground plane using ≥6 thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to output capacitor negative terminal at load to minimize IR drop errors. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing when driven by another regulator's output. |
| VIN (3,8) | Main input power supply | Dual pins reduce trace inductance and power loss; require parallel low-ESR ceramic bypassing to AGND and PGND. |
| PGND (4,7,13) | Power ground return path | Primary return for bottom switch; exposed pad (13) is mandatory for thermal and electrical performance - must be soldered to PCB ground plane. |
| SW (5,6) | Switch node output | High dv/dt node connecting internal MOSFETs to inductor; requires shortest possible wide trace to minimize EMI and ringing. |
| MODE/SYNC (9) | Mode selection & clock sync | Configures Burst Mode® (VIN), pulse skip (GND), or forced continuous (float); accepts 1MHz–3MHz external clock for system-level synchronization. |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency; ignored when external clock drives MODE/SYNC. |
| PGOOD (11) | Power good indicator | Open-drain output pulled low if VOUT falls below 98% or exceeds 110% of regulation, or during EN low/VIN UVLO/thermal shutdown. |
| FB (12) | Feedback input | Regulates to 500mV reference; connects to resistor divider between VOUT and AGND to set output voltage with ±1% accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB compared to conventional buck converters, eliminating need for metal shielding in space-constrained designs. |
| 22ns minimum on-time | Enables high step-down ratios (e.g., 5V→0.6V at 2MHz) with stable operation and minimal output ripple. |
| Low-RDS(ON) power switches | 31mΩ PMOS top switch and 8mΩ NMOS bottom switch minimize conduction losses, supporting >90% efficiency at 4A load. |
| Burst Mode® operation | Delivers 40µA quiescent current while maintaining <10mVpp output ripple - ideal for always-on IoT edge nodes. |
| Internal compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity while ensuring stability across all output capacitors. |
| AEC-Q100 qualified (I-grade) | Validated for automotive applications per AEC-Q100 Rev G, including HTOL, TC, and ESD testing - suitable for ADAS and infotainment power rails. |
Applications
| Automotive ADAS Camera Power | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering image sensor and ISP in rear-view or surround-view camera modules with strict EMI limits and wide input voltage range. IC Role / Device Role / Timing Role: Primary 1.2V/4A POL regulator converting 5V domain rail; operates in Burst Mode® during standby to meet ISO 11452-2 radiated emissions requirements. Use Value: Silent Switcher® architecture achieves CISPR-25 Class 5 compliance without ferrite beads or shielded inductors, reducing solution size by 35%. |
Use Scenario: Delivering tightly regulated 0.85V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA under dynamic load transients up to 3A/µs. IC Role / Device Role / Timing Role: Synchronous buck controller with 22ns min on-time and 100% duty cycle capability, enabling seamless dropout during brown-out conditions. Use Value: Fast transient response (<10µs recovery) and ±1% output accuracy maintain FPGA timing margins across –40°C to +125°C junction temperature. |
| Optical Transceiver Module | Industrial PLC I/O Power |
|
Use Scenario: Generating 3.3V and 1.2V rails inside SFP+ or QSFP28 modules where board space is limited to <100mm² and thermal dissipation is constrained. IC Role / Device Role / Timing Role: Dual-rail capable converter (with external resistors) operating at 2.5MHz to shrink inductor/capacitor footprint; LQFN package enables 0.74mm profile. Use Value: 2mm × 2mm footprint and 51°C/W θJA allow full 4A output in 125°C ambient without forced air cooling. |
Use Scenario: Providing isolated 5V and 3.3V auxiliary supplies for analog front-end and microcontroller in DIN-rail mounted PLCs with 24V DC input. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in forced continuous mode to suppress low-frequency noise interfering with 24-bit ADC measurements. Use Value: <10mVpp output ripple in forced continuous mode eliminates need for post-regulator LDOs, cutting BOM cost and power loss by 15%. |
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 |
|---|---|---|---|
| TPS544B20RVFT | 4A, 4.5–18V input, 0.6–5.5V output; 1.5MHz fixed freq; no Burst Mode®, higher IQ (120µA) | Requires external compensation; not AEC-Q100 qualified; better suited for industrial 12V intermediate bus than automotive 5V POL | Select when input voltage exceeds 5.5V or when system-level EMI filtering is already implemented. |
| MP2338GJ-Z | 4A, 2.5–5.5V input, 0.6–5V output; 2MHz fixed freq; 30µA IQ in skip mode; no SYNC or RT pin | Lacks frequency synchronization and programmability; smaller 2mm × 2mm QFN but no exposed thermal pad | Choose for cost-sensitive consumer applications where EMI is less critical and thermal margin is sufficient. |
Compared with TPS544B20RVFT and MP2338GJ-Z, the LTC3308AIV#TRMPBF uniquely combines AEC-Q100 qualification, Silent Switcher® EMI reduction, and 1MHz–3MHz programmability - making it the only option qualified for automotive camera modules requiring both low noise and high reliability.
Availability
LTC3308AIV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS, FPGA core supplies, optical transceivers, and industrial PLCs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3308AIV#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, communications, and automotive markets since 1965.
The LTC3308AIV#TRMPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, low-noise DC/DC converters designed specifically for space-constrained, EMI-sensitive applications in automotive, optical, and industrial systems.
FAQ
What is the maximum output current capability of the LTC3308AIV#TRMPBF?
The LTC3308AIV#TRMPBF delivers up to 4A continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB, 200mm² copper pour). Peak current limit is 6.4A (typical), and sustained 4A operation requires proper thermal design - including soldering the exposed PGND pad to a multi-via ground plane. Derating applies above 85°C ambient.
Does the LTC3308AIV#TRMPBF support output voltages below 1V?
Yes, the LTC3308AIV#TRMPBF regulates output voltages as low as 0.5V with ±1% accuracy over temperature. This is achieved via its precise 500mV feedback reference and internal error amplifier. For example, a 0.85V FPGA core rail is set using RA = 68kΩ and RB = 100kΩ, maintaining tight regulation even during rapid load transients.
How does the MODE/SYNC pin affect efficiency and noise in the LTC3308AIV#TRMPBF?
The MODE/SYNC pin configures three distinct operating modes: Burst Mode® (MODE/SYNC = VIN) gives 40µA IQ and lowest light-load efficiency but introduces ~25kHz envelope ripple; pulse skip (MODE/SYNC = GND) reduces ripple while maintaining moderate IQ (~60µA); forced continuous (MODE/SYNC = float) eliminates ripple entirely but increases light-load IQ to ~1.2mA. All modes retain full 4A capability.
Is the LTC3308AIV#TRMPBF pin-compatible with other members of the LTC330x family?
Yes, the LTC3308AIV#TRMPBF shares identical pinout and footprint with the LTC3307 (3A) and LTC3309 (6A), enabling scalable power design. However, current capability, RDS(ON), and thermal limits differ - the LTC3308AIV#TRMPBF's 8mΩ NMOS and 31mΩ PMOS are optimized for 4A, whereas LTC3309 uses lower-RDS(ON) switches and requires enhanced thermal handling.
What protection features are integrated into the LTC3308AIV#TRMPBF?
The LTC3308AIV#TRMPBF integrates output overvoltage protection (110% VOUT trip), short-circuit protection with valley-current limiting, thermal shutdown (165°C trip), input undervoltage lockout (2.1V rising), and reverse inductor current limiting (–2.0A typical). These features operate autonomously without external components, ensuring safe recovery from faults like output shorts or input brownouts.
LTC3308AIV#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)
LTC3308AIV#TRMPBF FAQ
1.How can I place an order for LTC3308AIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AIV#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 LTC3308AIV#TRMPBF reliable?
The price and inventory of LTC3308AIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AIV#TRMPBF?
LTC3308AIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AIV#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 LTC3308AIV#TRMPBF?
For technical support, including LTC3308AIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308AIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AIV#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 LTC3308AIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AIV#TRMPBF?
All LTC3308AIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AIV#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 LTC3308AIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308AIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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