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Analog Devices Inc. LTC3308BMPV#TRMPBF
- Part No.:
- LTC3308BMPV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BMPV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:905
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Product details
Overview
LTC3308BMPV#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 –55°C to +150°C operation.
For engineers reviewing the LTC3308BMPV#TRMPBF datasheet, LTC3308BMPV#TRMPBF pinout, LTC3308BMPV#TRMPBF application, or LTC3308BMPV#TRMPBF equivalent, key selection criteria include its 3–10MHz programmable switching frequency, 22ns minimum on-time, forced continuous/pulse-skipping/Burst Mode operation, AEC-Q100-qualified thermal range, and 2mm × 2mm LQFN package with exposed PGND pad.
Technical Context
The LTC3308BMPV#TRMPBF employs constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop tuning. Its 22ns minimum on-time supports high VIN/VOUT ratios (e.g., 5.5V→0.5V at 6.6MHz), while slope-compensated PWM ensures stability across load and input variations.
Silent Switcher® architecture uses symmetrical power loop layout and integrated bypass capacitors to suppress common-mode EMI; Burst Mode® operation achieves 40µA quiescent current with low-ripple regulation, and the MODE/SYNC pin enables seamless transition between pulse-skipping, forced continuous, and synchronized modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, USB PD, and distributed POL rails without pre-regulation. |
| IOUT Max | 4A continuous - delivers full rated current at TJ ≤ 150°C with proper PCB thermal design. |
| fSW Range | 3MHz to 10MHz - programmable via RT resistor or external SYNC clock; default 6.6MHz enables compact 150nH inductor. |
| VFB Accuracy | ±1% over –55°C to +150°C - ensures stable core voltage for FPGA/ASIC supplies under extreme thermal stress. |
| tON,min | 22ns - enables high step-down ratios (e.g., 5.5V→0.5V) at 6.6MHz without pulse skipping. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on automotive sensors and telematics modules. |
| Thermal Range | –55°C to +150°C junction - qualified per AEC-Q100 Grade MP (–55°C to +150°C), suitable for engine bay and transmission control units. |
| RDS(ON) | 31mΩ (PMOS) / 8mΩ (NMOS) - minimizes conduction loss at 4A, enabling >90% efficiency at 3.3V→1.8V/4A. |
Pinout & Package
The LTC3308BMPV#TRMPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), requiring soldering to a large PCB ground plane for θJB = 12°C/W 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 to reject PCB IR drop. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables power-up sequencing from another rail via resistor divider. |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; bypass separately to PGND and AGND with low-ESR ceramic capacitors. |
| PGND (4,7,13) | Power ground return | Exposed pad (Pin 13) is primary thermal and electrical path; requires ≥6 vias to inner ground planes. |
| SW (5,6) | Switch node | Dual pins minimize switching loop inductance; connect together and route directly to inductor with short, wide copper. |
| MODE/SYNC (9) | Mode selection & clock sync | Ground = pulse-skipping; float = forced continuous; VIN = Burst Mode; external clock = PLL-synchronized forced continuous. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz oscillator. |
| PGOOD (11) | Power good indicator | Open-drain output asserts high when VOUT is within –2%/+10% of regulation; includes 120µs delay and OV/UV hysteresis. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT to AGND; optional CFF improves transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB vs conventional buck converters, eliminating need for ferrite beads or shielding cans in space-constrained automotive modules. |
| Burst Mode® operation | Delivers 40µA IQ with <10mVpp output ripple at light loads - ideal for always-on infotainment standby and ADAS sensor wake-up circuits. |
| 100% duty cycle capability | Enables dropout operation down to VIN = VOUT + IOUT × RDS(ON) - supports brownout resilience in 12V automotive systems during cranking. |
| Inductor saturation tolerance | Safely handles temporary inductor saturation during overload without latch-up or damage - critical for motor driver gate supply protection. |
| AEC-Q100 Grade MP qualification | Validated for –55°C to +150°C operation with extended reliability testing - meets requirements for powertrain, chassis, and body control ECUs. |
| Internal soft-start & protection | Programmable 0.25–3ms soft-start prevents input surge; includes OVP, SCP, OTP, and reverse-current limiting for robust field deployment. |
Applications
| Automotive Engine Control Unit (ECU) | FPGA Core Power Supply |
|---|---|
Use Scenario: Regulating 5V input to 1.2V for microcontroller core in under-hood ECU exposed to –40°C to +150°C ambient. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise core voltage with fast load transient response. Use Value: AEC-Q100 MP qualification ensures reliability at 150°C junction; 22ns tON,min maintains regulation during cold-cranking voltage dips. |
Use Scenario: Generating 0.85V/4A for Xilinx Artix-7 FPGA core in telecom base station card with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency, high-frequency POL converter synchronized to system clock to avoid beat frequencies. Use Value: Silent Switcher architecture meets CISPR-22 Class B emissions; 6.6MHz operation enables 150nH inductor and <10mm² total solution size. |
| Optical Transceiver Module | Industrial PLC I/O Power Rail |
Use Scenario: Converting 3.3V backplane supply to 1.8V for SFP+ transceiver DSP with ultra-low noise requirement. IC Role / Device Role / Timing Role: Low-ripple, low-EMI point-of-load regulator powering sensitive analog front-end and SERDES circuitry. Use Value: Burst Mode® delivers 40µA IQ and <10mVpp ripple at µA-level bias currents; PGOOD enables precise power sequencing. |
Use Scenario: Providing isolated 5V/4A auxiliary rail for industrial PLC digital I/O modules operating in 0°C to +70°C enclosures. IC Role / Device Role / Timing Role: Robust, thermally efficient DC/DC converter with overvoltage and short-circuit protection for harsh factory environments. Use Value: 31mΩ/8mΩ MOSFETs minimize self-heating; exposed PGND pad ensures reliable thermal dissipation on standard FR4 PCBs. |
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 |
|---|---|---|---|
| LTC3307EV#TRMPBF | 3A output rating, same 2mm × 2mm LQFN package, identical pinout, but lower current capability and no AEC-Q100 MP grade. | Suitable for lower-power automotive sensors or portable devices where 3A suffices and extended temperature is not required. | Select when cost sensitivity outweighs need for 4A headroom or –55°C operation. |
| LTC3309HV#TRMPBF | 6A output, wider VIN range (2.25V–16V), same Silent Switcher architecture and MODE/SYNC functionality, but larger 3mm × 3mm LQFN package. | Required for higher-current applications like radar module power or multi-rail industrial controllers needing >4A. | Choose when future-proofing for higher load or supporting 12V input rails without external pre-regulator. |
Compared with LTC3307EV#TRMPBF and LTC3309HV#TRMPBF, the LTC3308BMPV#TRMPBF uniquely balances 4A capability, –55°C to +150°C operation, and minimal 2mm × 2mm footprint-making it optimal for space- and temperature-constrained automotive and industrial POL designs where 3A is insufficient and 6A is over-specified.
Availability
LTC3308BMPV#TRMPBF is available at Aetrix Electronics and suitable for automotive engine control units, FPGA core supplies, optical transceiver modules, and industrial PLC I/O power rails requiring stable component supply across extended temperature ranges.
Supply support for LTC3308BMPV#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.
The LTC3308BMPV#TRMPBF belongs to Analog Devices' Silent Switcher® DC/DC converter product line, engineered specifically for ultra-low EMI, high-density power conversion in automotive and mission-critical industrial applications.
FAQ
What is the operating temperature range of the LTC3308BMPV#TRMPBF?
The LTC3308BMPV#TRMPBF is specified for a junction temperature range of –55°C to +150°C and is AEC-Q100 qualified for automotive Grade MP applications. This extended range enables use in engine bay, transmission, and powertrain control units where ambient temperatures exceed standard commercial or industrial grades. The device incorporates overtemperature protection that shuts down the switcher above ~165°C and restarts at ~160°C.
How does the MODE/SYNC pin configure operating modes on the LTC3308BMPV#TRMPBF?
The MODE/SYNC pin on the LTC3308BMPV#TRMPBF selects three distinct operating modes: grounding the pin enables pulse-skipping mode for moderate light-load efficiency; tying it to VIN activates low-ripple Burst Mode® operation with 40µA quiescent current; floating the pin enables forced continuous conduction mode for fixed-frequency, lowest-output-ripple performance. When driven by an external 3–10MHz square wave, the pin synchronizes the internal oscillator in forced continuous mode with automatic slope compensation adaptation.
Can the LTC3308BMPV#TRMPBF support 100% duty cycle operation, and what is its significance?
Yes, the LTC3308BMPV#TRMPBF supports true 100% duty cycle operation, allowing the output voltage to track closely to the input voltage minus IOUT × RDS(ON). This capability is critical for automotive applications during cold-cranking events, where battery voltage can dip below the regulated output (e.g., 5V rail dropping to 3.2V), ensuring uninterrupted power to safety-critical microcontrollers without brownout reset.
What package type and thermal characteristics define the LTC3308BMPV#TRMPBF?
The LTC3308BMPV#TRMPBF uses a 12-lead 2mm × 2mm × 0.74mm LQFN package with an exposed PGND pad (Pin 13). Its thermal performance is characterized by θJA = 51°C/W, θJB = 12°C/W, and ΨJT = 0.6°C/W on a JEDEC 2S2P board. Successful thermal design requires soldering the exposed pad to a large internal ground plane using ≥6 thermal vias to ensure reliable operation at 4A continuous current within the –55°C to +150°C junction range.
Does the LTC3308BMPV#TRMPBF include protection features, and how do they function?
Yes, the LTC3308BMPV#TRMPBF integrates multiple protection features: output overvoltage protection disables the top switch if FB exceeds 110% of regulation; short-circuit protection uses valley-current limiting to skip cycles until inductor current falls below IVALLEYMAX; thermal shutdown engages above ~165°C; and PGOOD provides open-drain fault signaling with built-in 120µs delay and hysteresis. These features ensure robust field operation in automotive and industrial environments without external supervision circuitry.
LTC3308BMPV#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:
- 3MHz ~ 10MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308BMPV#TRMPBF FAQ
1.How can I place an order for LTC3308BMPV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BMPV#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 LTC3308BMPV#TRMPBF reliable?
The price and inventory of LTC3308BMPV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BMPV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BMPV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BMPV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BMPV#TRMPBF?
LTC3308BMPV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BMPV#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 LTC3308BMPV#TRMPBF?
For technical support, including LTC3308BMPV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BMPV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308BMPV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BMPV#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 LTC3308BMPV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BMPV#TRMPBF?
All LTC3308BMPV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BMPV#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 LTC3308BMPV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308BMPV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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