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Analog Devices Inc. LTC3308BJV#TRPBF
- Part No.:
- LTC3308BJV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BJV#TRPBF.pdf
- Description:
- IC REG BUCK 4A
- Quantity:
- Payment:
- Shipping:
Inventory:2,447
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Product details
Overview
LTC3308BJV#TRPBF 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 - deployed in automotive power rails, FPGA core supplies, and compact POL systems.
For engineers reviewing the LTC3308BJV#TRPBF datasheet, LTC3308BJV#TRPBF pinout, LTC3308BJV#TRPBF application, or LTC3308BJV#TRPBF equivalent, key selection criteria include its AEC-Q100 qualified –40°C to +150°C junction temperature rating, Silent Switcher® EMI reduction, forced continuous/pulse-skipping/Burst Mode operation, and 2mm × 2mm LQFN thermal performance.
Technical Context
The LTC3308BJV#TRPBF uses constant-frequency peak current mode control with internal compensation, supporting programmable 3MHz–10MHz switching via RT resistor or external clock synchronization on MODE/SYNC. Its architecture enables fast transient response and stable regulation down to 500mV output.
It integrates 31mΩ PMOS and 8mΩ NMOS power switches, delivers up to 100% duty cycle for low-dropout operation, and features dual current limiting (6.4A peak, 5.2A valley), output overvoltage protection (110% VOUT), and thermal shutdown at 165°C.
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 system rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - enables direct core supply for modern SoCs, FPGAs, and ASICs requiring sub-1V logic rails. |
| Max Output Current | 4A continuous - sustained delivery under thermal limits in 2mm × 2mm LQFN with exposed PGND pad. |
| Switching Frequency | 3MHz to 10MHz (programmable) - allows ultra-small 150nH inductors and 0201/0402 capacitors for minimal PCB footprint. |
| Feedback Accuracy | ±1% over temperature - ensures tight output regulation across automotive and industrial ambient ranges. |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on sensor nodes and portable instrumentation. |
| Min On-Time | 22ns - enables high step-down ratios (e.g., 5.5V → 0.6V at 6.6MHz) without pulse skipping instability. |
| Junction Temp Range | –40°C to +150°C - AEC-Q100 qualified for under-hood automotive, motor control, and high-temp industrial use. |
Pinout & Package
The LTC3308BJV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), optimized for low θJA = 51°C/W and high-power density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote output voltage sense return; must connect directly to output capacitor negative terminal and serve as FB/RT reference. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables sequencing from other regulators or microcontroller GPIO. |
| VIN (3,8) | Main power input | Dual high-current paths for internal circuitry and top switch; requires parallel low-ESR ceramic bypassing to PGND/AGND. |
| PGND (4,7,13) | Power ground return | Primary return for bottom switch; exposed pad (Pin 13) must be soldered to large PCB ground plane with multiple vias. |
| SW (5,6) | Switch node | High dv/dt node connecting internal MOSFETs to external inductor; requires short, wide copper trace to minimize ringing. |
| MODE/SYNC (9) | Mode selection & sync input | Configures Burst Mode (high), pulse-skipping (low), forced continuous (float), or external clock sync (3–10MHz square wave). |
| RT (10) | Frequency programming | Resistor-to-AGND sets switching frequency from 3–10MHz; open or tied to VIN selects default 6.6MHz. |
| PGOOD (11) | Power good indicator | Open-drain output asserting high when VOUT is within –2%/+10% of target; includes 120µs delay and OV/UV fault reporting. |
| FB (12) | Feedback input | Regulates VFB to 500mV; connects to resistor divider from VOUT to AGND to set output voltage precisely. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >20dB vs conventional buck converters - eliminates need for metal shielding in sensitive RF or medical designs. |
| Burst Mode® operation | 40µA quiescent current at light load with low-output ripple - maintains efficiency >85% at 1mA while avoiding audible noise. |
| 100% duty cycle capability | Enables dropout operation down to VIN – ILOAD × RDS(ON) - supports brownout resilience in automotive start-stop and battery-depleted scenarios. |
| Inductor saturation tolerance | Safely handles temporary inductor saturation during overload without latch-up or damage - simplifies magnetics selection for cost-sensitive designs. |
| Internal soft-start & compensation | Fixed 1ms soft-start duration and fully compensated loop - eliminates external compensation components and reduces BOM count. |
| AEC-Q100 Grade J qualification | Validated for automotive under-hood applications with guaranteed operation to +150°C junction temperature - meets stringent reliability and lifetime requirements. |
Applications
| Automotive ADAS Power Rail | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering image signal processors and radar SoCs in camera modules and domain controllers where space, heat, and EMI are constrained. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V core regulator delivering 4A with fast load-step response and <10mV undershoot during 2A/µs transients. Use Value: Silent Switcher® EMI suppression avoids interference with 77GHz radar receivers; 150°C rating supports placement near heat-generating sensors. |
Use Scenario: Generating tightly regulated 0.85V core voltage for Xilinx Artix-7 or Intel Cyclone V FPGAs in industrial PLCs and edge AI accelerators. IC Role / Device Role / Timing Role: High-accuracy, low-noise POL converter with ±1% VFB and internal soft-start to prevent configuration corruption during power-up. Use Value: 22ns min-on-time enables direct 5V-to-0.85V conversion at 6.6MHz - eliminates intermediate stages and saves board area. |
| Optical Transceiver Module | Industrial IoT Sensor Hub |
|
Use Scenario: Providing clean 3.3V bias for laser diode drivers and TIAs in SFP+/QSFP28 pluggable modules operating in telecom central offices. IC Role / Device Role / Timing Role: Low-ripple, low-noise step-down regulator synchronized to system clock to avoid beat frequencies in analog front-ends. Use Value: MODE/SYNC pin enables precise 10MHz synchronization - eliminates switching noise sidebands in critical 25Gbps data lanes. |
Use Scenario: Powering ARM Cortex-M7 microcontrollers, LoRaWAN radios, and MEMS sensors in battery-operated predictive maintenance gateways deployed in factory environments. IC Role / Device Role / Timing Role: Dual-mode regulator operating in Burst Mode (40µA IQ) during sleep and forced continuous mode during active sensing bursts. Use Value: 40µA quiescent current extends 2xAA alkaline battery life beyond 5 years in periodic wake-up applications. |
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#TRPBF | 3A rated, same 2mm × 2mm LQFN package, 3MHz–6MHz frequency range, lower max current and higher RDS(ON). | Targeted at lower-power microcontrollers and peripherals where 3A suffices and cost sensitivity outweighs headroom needs. | Select when design load stays ≤3A and thermal margin allows relaxed derating; not suitable for 4A FPGA cores. |
| LTC3309HV#TRPBF | 6A rated, identical pinout and feature set, but rated for –40°C to +150°C with higher current capability and slightly larger thermal footprint. | Used in high-power compute modules, GPU auxiliary rails, or redundant power paths where >4A headroom is required. | Choose for future-proofing or parallel operation; shares layout but requires larger inductor and input capacitance. |
Compared with LTC3307EV#TRPBF and LTC3309HV#TRPBF, the LTC3308BJV#TRPBF delivers optimal balance of 4A capability, ultra-small size, and automotive-grade reliability - making it the preferred choice for space-constrained, thermally demanding, and safety-critical 4A POL applications.
Availability
LTC3308BJV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS systems, FPGA core supplies, and optical networking equipment requiring stable component supply with full AEC-Q100 compliance and extended temperature support.
Supply support for LTC3308BJV#TRPBF 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 LTC3308B product line delivers ultra-compact, high-efficiency, low-EMI synchronous buck converters for space- and noise-sensitive applications - designed specifically for next-generation automotive electronics, optical infrastructure, and intelligent edge devices.
FAQ
What is the maximum junction temperature rating for the LTC3308BJV#TRPBF?
The LTC3308BJV#TRPBF is rated for operation up to +150°C junction temperature and is AEC-Q100 qualified for automotive applications. This Grade J rating ensures guaranteed performance and reliability in under-hood environments, motor control enclosures, and other high-temperature industrial settings where standard commercial or industrial grade parts would fail.
Does the LTC3308BJV#TRPBF require external compensation components?
No, the LTC3308BJV#TRPBF features fully internal compensation - no external Type II or Type III compensation network is needed. Its peak current mode architecture with built-in slope compensation and fixed compensation ensures stable operation across all loads and input/output combinations when using recommended external components like the 150nH inductor and 4.7µF input capacitors.
How does the MODE/SYNC pin configure operating modes on the LTC3308BJV#TRPBF?
The MODE/SYNC pin on the LTC3308BJV#TRPBF selects three distinct modes: tie to GND for pulse-skipping, tie to VIN for Burst Mode® (40µA IQ), or leave floating for forced continuous conduction. It also accepts 3MHz–10MHz external square-wave clocks for synchronization - enabling noise-sensitive systems to align switching edges and eliminate beat frequencies.
Can the LTC3308BJV#TRPBF operate with an input voltage as low as 2.25V?
Yes, the LTC3308BJV#TRPBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, it maintains regulation down to 500mV output with full 4A capability, though RDS(ON) increases slightly - requiring careful thermal design and validation per the datasheet's high-temperature derating curves and junction temperature calculation (TJ = TA + PD × θJA).
What protection features are integrated into the LTC3308BJV#TRPBF?
The LTC3308BJV#TRPBF integrates output overvoltage protection (110% VOUT trip), short-circuit protection via valley current limiting (5.2A), thermal shutdown at ~165°C, input UVLO with hysteresis, and robust SW node leakage handling. Its PGOOD pin provides fault signaling for undervoltage, overvoltage, and thermal events - enabling system-level monitoring and safe power sequencing.
LTC3308BJV#TRPBF 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:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308BJV#TRPBF FAQ
1.How can I place an order for LTC3308BJV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BJV#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3308BJV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BJV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BJV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BJV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BJV#TRPBF?
LTC3308BJV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BJV#TRPBF 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#TRPBF?
For technical support, including LTC3308BJV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BJV#TRPBF requirements.
6.How does Aetrix verify that LTC3308BJV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BJV#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BJV#TRPBF?
All LTC3308BJV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BJV#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308BJV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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