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Analog Devices Inc. LTC3308BJV#TRMPBF
- Part No.:
- LTC3308BJV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BJV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:485
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Product details
Overview
LTC3308BJV#TRMPBF from Analog Devices is a monolithic synchronous step-down DC/DC converter delivering up to 4A output at 500mV–VIN, operating from 2.25V–5.5V input with 6.6MHz default switching frequency, 22ns minimum on-time, and ±1% VFB accuracy over temperature. It integrates 8mΩ NMOS and 31mΩ PMOS power switches, supports forced continuous, pulse-skipping, and low-ripple Burst Mode operation, and targets compact POL supplies in automotive infotainment and ADAS subsystems.
For engineers reviewing the LTC3308BJV#TRMPBF datasheet, LTC3308BJV#TRMPBF pinout, LTC3308BJV#TRMPBF application, or LTC3308BJV#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualified –40°C to +150°C junction temperature rating, Silent Switcher® EMI reduction, 100% duty cycle dropout capability, and compatibility with 2mm × 2mm LQFN layout constraints for space-constrained automotive modules.
Technical Context
The LTC3308BJV#TRMPBF uses constant-frequency peak current mode control with internal compensation, enabling fast transient response without external loop components. Its 22ns minimum on-time supports high VIN/VOUT ratios (e.g., 5.5V→1.8V at 6.6MHz), while programmable 3–10MHz switching via RT resistor or MODE/SYNC synchronization allows optimization of efficiency vs. size trade-offs.
Three operating modes-forced continuous (fixed-frequency, reverse inductor current allowed), pulse-skipping (light-load efficiency), and Burst Mode® (40µA IQ, low-ripple)-are selected via MODE/SYNC pin voltage level. Output protection includes overvoltage detection (107–114% VOUT threshold), short-circuit valley-current limiting (5.2A IVALLEYMAX), and thermal shutdown at 165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - Enables direct regulation from single-cell Li-ion or 3.3V/5V rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - Supports core voltages down to 500mV for modern SoCs and FPGAs. |
| Max Output Current | 4A continuous - Delivers full rated load in thermally enhanced 2mm × 2mm LQFN with exposed PGND pad. |
| Switching Frequency | 3MHz to 10MHz (programmable) - Allows use of sub-220nH inductors and 10µF-class ceramic output caps. |
| Feedback Accuracy | ±1% over –40°C to +150°C - Ensures stable core voltage under automotive under-hood thermal stress. |
| IQ in Burst Mode | 40µA - Extends battery runtime in always-on automotive sensors and telematics modules. |
| Thermal Rating | Junction temp: –40°C to +150°C - Qualified per AEC-Q100 Grade 1, suitable for engine bay proximity mounting. |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed PGND pad (Pin 13), θJA = 51°C/W, optimized for automotive thermal cycling reliability.
| 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 from another rail's output via resistor divider. |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance; require parallel low-ESR ceramic bypassing to PGND and 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 | Dual pins minimize switching loop area; connect together and route directly to inductor with shortest possible trace. |
| MODE/SYNC (9) | Mode selection & clock sync | Ground = pulse-skip; float = forced continuous; VIN = Burst Mode; external square wave = sync (3–10MHz). |
| RT (10) | Frequency programming | Resistor to AGND sets fSW; open = 6.6MHz default; tied to VIN = same default; ignored during external sync. |
| PGOOD (11) | Power good indicator | Open-drain output asserts low if VOUT < 97% or > 110% nominal, or during EN low/VIN UVLO/thermal fault. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider between VOUT and AGND; phase-lead cap improves transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces EMI emissions by >20dB vs. conventional buck converters, eliminating need for ferrite beads in automotive EMC-critical zones. |
| 100% duty cycle operation | Enables ultra-low dropout (e.g., 3.3V→3.0V at 4A) without external LDO, minimizing power loss in battery-fed systems. |
| Low-ripple Burst Mode® | Maintains <10mVPP output ripple at light loads while achieving 40µA quiescent current-critical for always-on vehicle networks. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +150°C operation with extended lifetime testing, supporting placement near ECUs and radar modules. |
| Internal compensation | Eliminates external compensation network, reducing BOM count and layout sensitivity-ideal for high-volume automotive production. |
Applications
| Automotive ADAS Camera Module | Infotainment System Core Supply |
|---|---|
Use Scenario: Powering 1.2V core of image signal processor (ISP) in rear-view camera with strict EMI limits near RF antennas. IC Role / Device Role / Timing Role: Primary POL regulator delivering 3A at 1.2V with synchronized 6.6MHz switching to avoid interference with 5.8GHz radar bands. Use Value: Silent Switcher® architecture meets CISPR 25 Class 5 radiated emissions without shielding, reducing module cost and weight. |
Use Scenario: Generating 1.8V for application processor in head unit with variable load (10mA–4A) and cold-crank immunity. IC Role / Device Role / Timing Role: High-efficiency buck supplying processor core with Burst Mode® for standby and forced continuous for active UI rendering. Use Value: 40µA IQ extends battery backup time during ignition-off; 2.25V min VIN supports operation during 6V cold-crank transients. |
| Automotive Telematics Control Unit | Engine Control Unit (ECU) Sensor Interface |
Use Scenario: Providing isolated 3.3V rail for LTE modem and GNSS receiver in connected car gateway with thermal constraints. IC Role / Device Role / Timing Role: Compact 4A regulator in 2mm × 2mm footprint powering modem baseband IC with 100% duty cycle support for brownout resilience. Use Value: 150°C max junction rating allows placement near heat-generating cellular RF front-end without derating. |
Use Scenario: Supplying 5V to analog sensor signal chain (pressure, temperature) in engine bay with wide ambient swings. IC Role / Device Role / Timing Role: Input-capable buck converting 12V battery (with transients) to clean 5V using external RT resistor for 4MHz switching. Use Value: 22ns min on-time enables stable 5V output even during 16V load-dump events when VIN dips momentarily below 6V. |
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 |
|---|---|---|---|
| TPS6286418RTER | 4A, 2.7–6V input, 1.8V fixed output, 4MHz default, no MODE/SYNC pin, lower thermal rating (–40°C to +125°C). | Lacks Burst Mode® and external sync; not AEC-Q100 qualified; limited to cabin-grade modules only. | Select when fixed 1.8V output suffices and automotive under-hood placement is unnecessary. |
| MP2145GJ-Z | 4A, 2.5–5.5V input, 500mV–5.5V adjustable, 2MHz default, no Silent Switcher®, higher EMI, 125°C max junction. | Higher radiated emissions require filtering; unsuitable for radar-adjacent layouts; lacks AEC-Q100 validation. | Choose for cost-sensitive non-automotive industrial POL where EMI is less constrained. |
Compared with TPS6286418RTER and MP2145GJ-Z, the LTC3308BJV#TRMPBF uniquely combines AEC-Q100 Grade 1 qualification, Silent Switcher® EMI suppression, and programmable 3–10MHz operation-making it the only option for thermally demanding, noise-sensitive automotive domains requiring both reliability and spectral cleanliness.
Availability
LTC3308BJV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS, infotainment, and telematics applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3308BJV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving automotive, industrial, communications, and healthcare markets with robust, precision power solutions.
The LTC3308B product line delivers ultra-compact, high-frequency synchronous buck regulators for automotive and space-constrained POL applications, emphasizing low EMI, wide temperature operation, and seamless integration into safety-critical systems.
FAQ
What is the maximum junction temperature rating for the LTC3308BJV#TRMPBF?
The LTC3308BJV#TRMPBF is rated for operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This rating is validated through extended lifetime testing and thermal characterization, making the LTC3308BJV#TRMPBF suitable for under-hood placement near ECUs or radar modules where ambient temperatures exceed 105°C.
How does the LTC3308BJV#TRMPBF achieve low EMI performance?
The LTC3308BJV#TRMPBF implements Silent Switcher® architecture, which uses symmetrical power switch layouts and integrated input capacitors to cancel magnetic field emissions. Measured radiated emissions are >20dB lower than conventional buck converters at 100MHz, enabling compliance with CISPR 25 Class 5 without additional shielding or filtering-critical for automotive radar and antenna proximity.
Can the LTC3308BJV#TRMPBF operate with a 2.25V input supply?
Yes, the LTC3308BJV#TRMPBF supports input voltages as low as 2.25V, enabling direct regulation from single-cell Li-ion batteries or degraded 3.3V rails. At this minimum VIN, the device maintains regulation down to 500mV output with full 4A capability, though RDS(ON) increases slightly-designers should verify thermal margin using θJA = 51°C/W and worst-case power loss calculations.
What are the three operating modes of the LTC3308BJV#TRMPBF and how are they selected?
The LTC3308BJV#TRMPBF offers forced continuous mode (floating MODE/SYNC), pulse-skipping mode (MODE/SYNC grounded), and Burst Mode® operation (MODE/SYNC tied to VIN). Each mode optimizes efficiency vs. ripple vs. transient response: Burst Mode® achieves 40µA IQ, forced continuous ensures fixed-frequency low-noise output, and pulse-skipping balances light-load efficiency with moderate ripple-selected solely by MODE/SYNC pin voltage.
Is the LTC3308BJV#TRMPBF pin-compatible with other members of the LTC3308 family?
Yes, the LTC3308BJV#TRMPBF shares identical 12-lead 2mm × 2mm LQFN pinout and footprint with all LTC3308x variants (e.g., LTC3308BEV#TRMPBF, LTC3308BIV#TRMPBF), enabling drop-in replacement across temperature grades. However, the J-grade part's higher 150°C junction rating and AEC-Q100 qualification require verification of thermal design margins when substituting into existing designs rated for lower temperature grades.
LTC3308BJV#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:
- 2
- Voltage - Input (Min):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A, 2A
- Frequency - Switching:
- 6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308BJV#TRMPBF FAQ
1.How can I place an order for LTC3308BJV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BJV#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 LTC3308BJV#TRMPBF reliable?
The price and inventory of LTC3308BJV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BJV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BJV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BJV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BJV#TRMPBF?
LTC3308BJV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BJV#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 LTC3308BJV#TRMPBF?
For technical support, including LTC3308BJV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BJV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308BJV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BJV#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 LTC3308BJV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BJV#TRMPBF?
All LTC3308BJV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BJV#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 LTC3308BJV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308BJV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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