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Analog Devices Inc. LTC3308BHV#TRMPBF
- Part No.:
- LTC3308BHV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308BHV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 2A/2A DL 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:993
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Product details
Overview
LTC3308BHV#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 (–40°C to +150°C) 2mm × 2mm LQFN packaging.
For engineers reviewing the LTC3308BHV#TRMPBF datasheet, LTC3308BHV#TRMPBF pinout, LTC3308BHV#TRMPBF application, or LTC3308BHV#TRMPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specs per AEC-Q100 qualification, and real-world mode-selection trade-offs between Burst Mode (40µA IQ), forced continuous, and pulse-skipping operation.
Technical Context
The LTC3308BHV#TRMPBF uses constant-frequency peak current mode control with programmable 3MHz–10MHz switching via RT resistor or external clock synchronization on MODE/SYNC, enabling fast transient response supported by 22ns minimum on-time and internal compensation. Its dual-MOSFET power stage integrates an 8mΩ NMOS bottom switch and 31mΩ PMOS top switch.
It supports three operational modes selected via MODE/SYNC: forced continuous (floating pin), pulse-skipping (grounded), or low-ripple Burst Mode® (tied to VIN), with built-in output overvoltage protection (107–114% VOUT threshold), short-circuit recovery via valley-current limiting (IVALLEYMAX = 5.2A), and thermal shutdown at 165°C (typical).
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 external LDO pre-regulation |
| IOUT Max | 4A continuous - sufficient for FPGA core, ASIC I/O, or microprocessor supply with margin |
| VOUT Accuracy | ±1% over temperature - ensures stable voltage regulation across automotive thermal cycles |
| Switching Frequency | 3MHz to 10MHz - enables sub-2mm inductors and compact POL designs while maintaining loop bandwidth |
| Min On-Time | 22ns - allows high step-down ratios (e.g., 5.5V→0.5V at 10MHz) without pulse skipping |
| Quiescent Current | 40µA in Burst Mode sleep - extends battery life in always-on automotive sensors or telematics modules |
| Thermal Rating | Junction range –40°C to +150°C - qualified per AEC-Q100 Grade H for under-hood and infotainment applications |
Pinout & Package
Package: 12-lead 2mm × 2mm × 0.74mm LQFN with exposed PGND pad (Pin 13), optimized for low θJA (51°C/W) and high-power density.
| 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 power-up sequencing from another rail's output |
| VIN (3,8) | Main power input | Dual pins reduce trace inductance and IR drop; bypass separately to PGND and AGND with low-ESR ceramics |
| PGND (4,7,13) | Power ground return | Exposed pad is primary thermal path and low-inductance return for bottom switch; requires ≥6 vias to inner ground plane |
| SW (5,6) | Switch node | High dv/dt node connecting internal MOSFETs to inductor; must use short, wide copper pour to minimize EMI |
| MODE/SYNC (9) | Mode selection & sync input | Configures operation mode (pulse-skip/Burst/forced continuous) or accepts 3–10MHz external clock for system-wide timing alignment |
| RT (10) | Frequency programming | Resistor-to-AGND sets fSW from 3–10MHz; open or tied to VIN selects default 6.6MHz |
| PGOOD (11) | Open-drain status output | Asserts high-Z when VOUT is within –2%/+10% window; pulled low during UVLO, EN=low, or OV fault (120µs delay) |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider from VOUT to AGND; phase-lead cap (2–22pF) improves transient response |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB vs conventional buck converters, eliminating need for shielding cans in space-constrained automotive modules |
| 100% duty cycle operation | Enables dropout operation down to VIN ≈ VOUT + (IOUT × RDS(ON)_PMOS), critical for battery-powered systems near end-of-discharge |
| Inductor saturation tolerance | Continues safe operation even if inductor saturates during overload, preventing catastrophic failure in harsh environments |
| Internal soft-start | 0.25–3ms programmable ramp prevents input surge and output overshoot during cold start or fault recovery |
| AEC-Q100 Grade H qualification | Validated for automotive under-hood applications with guaranteed operation from –40°C to +150°C junction temperature |
Applications
| Automotive ADAS Power Supply | Optical Transceiver Bias Rail |
|---|---|
Use Scenario: Powers image signal processor (ISP) and radar MMIC in forward-facing camera module mounted near engine compartment. IC Role / Device Role / Timing Role: Primary 1.2V/4A core supply with tight load-transient response and EMI immunity to avoid interference with RF receivers. Use Value: Silent Switcher® architecture meets CISPR-25 Class 5 emissions limits without ferrite beads or shielded inductors, reducing BOM cost and board area. |
Use Scenario: Generates stable 3.3V bias for 100G optical transceivers in telecom line cards where thermal density and noise coupling are critical. IC Role / Device Role / Timing Role: Point-of-load regulator synchronized to system clock via MODE/SYNC pin to eliminate beat frequencies in analog front-end circuits. Use Value: 6.6MHz default frequency enables <1µH inductors and <10µF total output capacitance, minimizing thermal footprint in air-cooled chassis. |
| FPGA Core Voltage Regulator | Industrial PLC I/O Module Supply |
Use Scenario: Supplies configurable logic core (VCCINT) of Xilinx Artix-7 FPGA in factory automation controller requiring rapid dynamic voltage scaling. IC Role / Device Role / Timing Role: High-bandwidth buck converter using forced continuous mode to maintain fixed 6.6MHz switching during load steps up to 3A/µs. Use Value: 22ns min on-time supports 1.0V output from 3.3V input at full frequency, avoiding mode transitions that induce output ripple during DVFS events. |
Use Scenario: Powers isolated CAN FD and RS-485 transceivers in DIN-rail mounted PLC I/O module operating continuously in 70°C ambient enclosures. IC Role / Device Role / Timing Role: Robust 5V-to-3.3V POL converter with AEC-Q100 H-grade thermal margin and integrated overvoltage/short-circuit protection. Use Value: 150°C max junction rating and thermal shutdown at 165°C ensure reliable operation without derating in convection-cooled industrial environments. |
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 |
|---|---|---|---|
| LTC3307EDE#TRMPBF | 3A rated, same package and pinout, but lower current capability and no AEC-Q100 qualification | Suitable for non-automotive 1.8V/3A FPGA I/O rails where thermal margin is less constrained | Select only if load current remains ≤3A and automotive qualification is unnecessary |
| TPS62864DRLR | 4A, 2.5V–5.5V input, 1.8V fixed output, 4mm² QFN, but lacks Burst Mode IQ <100µA and AEC-Q100 grade | Better for cost-sensitive consumer electronics with fixed 1.8V output and no EMI constraints | Choose when fixed-output simplicity outweighs programmability, EMI performance, and extended temperature support |
Compared with LTC3307EDE#TRMPBF and TPS62864DRLR, the LTC3308BHV#TRMPBF uniquely combines AEC-Q100 Grade H qualification, 40µA Burst Mode IQ, Silent Switcher® EMI reduction, and 22ns min on-time-making it the only option for thermally demanding, noise-sensitive automotive or industrial POL applications requiring full feature parity.
Availability
LTC3308BHV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, optical networking equipment, and industrial PLC power supplies requiring stable component supply with guaranteed long-term lifecycle support and AEC-Q100 compliance.
Supply support for LTC3308BHV#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 semiconductors, serving precision instrumentation, industrial automation, and automotive safety markets since 1965.
The LTC3308BHV#TRMPBF belongs to Analog Devices' Silent Switcher® DC/DC converter family, engineered specifically for ultra-low EMI, high-density power conversion in automotive, telecom, and mission-critical embedded systems.
FAQ
What is the maximum junction temperature rating for the LTC3308BHV#TRMPBF?
The LTC3308BHV#TRMPBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade H. Thermal shutdown activates at approximately 165°C (typical) to protect the device during overload or poor heatsinking conditions. The exposed PGND pad must be soldered to a large PCB ground plane with ≥6 thermal vias to maintain this rating in sustained 4A operation.
How does the MODE/SYNC pin configure operating modes on the LTC3308BHV#TRMPBF?
The MODE/SYNC pin on the LTC3308BHV#TRMPBF selects three distinct modes: grounding enables pulse-skipping mode for moderate efficiency and low noise; tying to VIN activates low-ripple Burst Mode® with 40µA quiescent current; floating enables forced continuous mode for fixed-frequency operation and best transient response. When driven by a 3–10MHz square wave, it synchronizes the internal oscillator while enforcing forced continuous mode.
Can the LTC3308BHV#TRMPBF regulate output voltages below 1V?
Yes, the LTC3308BHV#TRMPBF regulates output voltages as low as 0.5V using the FB pin referenced to its internal 500mV precision bandgap. For example, a 1.0V output requires RA = 100kΩ and RB = 100kΩ; a 0.6V output uses RA = 20kΩ and RB = 100kΩ. Output accuracy remains ±1% over temperature, and the 22ns minimum on-time supports high step-down ratios even at 10MHz switching.
What is the purpose of the AGND pin on the LTC3308BHV#TRMPBF, and how should it be routed?
The AGND pin on the LTC3308BHV#TRMPBF serves as the remote voltage sense return and analog ground reference for the feedback amplifier and internal reference. It must be connected directly to the negative terminal of the output capacitor at the load point-not to the PGND plane-to reject PCB trace resistance errors. A dedicated 0201 or 0402 ceramic capacitor should be placed between AGND and VIN (Pin 3) to filter high-frequency noise affecting regulation accuracy.
Does the LTC3308BHV#TRMPBF support external frequency synchronization, and what are the requirements?
Yes, the LTC3308BHV#TRMPBF supports external synchronization via the MODE/SYNC pin across 3MHz–10MHz. The input clock must be a square wave with high-level ≥1.2V, low-level ≤0.4V, and minimum high/low pulse widths of 40ns each. During synchronization, the device operates in forced continuous mode, and slope compensation automatically adapts to the external frequency-enabling deterministic timing alignment in multi-rail systems.
LTC3308BHV#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)
LTC3308BHV#TRMPBF FAQ
1.How can I place an order for LTC3308BHV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308BHV#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 LTC3308BHV#TRMPBF reliable?
The price and inventory of LTC3308BHV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308BHV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3308BHV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308BHV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308BHV#TRMPBF?
LTC3308BHV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308BHV#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 LTC3308BHV#TRMPBF?
For technical support, including LTC3308BHV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308BHV#TRMPBF requirements.
6.How does Aetrix verify that LTC3308BHV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308BHV#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 LTC3308BHV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3308BHV#TRMPBF?
All LTC3308BHV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308BHV#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 LTC3308BHV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3308BHV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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