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Analog Devices Inc. LTC3308AHV#TRPBF
- Part No.:
- LTC3308AHV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-VFQFN Exposed Pad
- Datasheet:
-
LTC3308AHV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 12LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,593
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Product details
Overview
LTC3308AHV#TRPBF 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% VFB accuracy, and featuring Silent Switcher architecture for ultralow EMI in automotive-grade 2mm × 2mm LQFN-12 package.
For engineers reviewing the LTC3308AHV#TRPBF datasheet, LTC3308AHV#TRPBF pinout, LTC3308AHV#TRPBF application, or LTC3308AHV#TRPBF equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal specs (–40°C to +150°C), real-world efficiency curves at 2MHz, and two rigorously cross-checked alternative parts for POL and battery-powered systems.
Technical Context
The LTC3308AHV#TRPBF uses constant-frequency peak current mode control with programmable 1MHz–3MHz switching via RT resistor or external SYNC clock, enabling fast transient response and stable operation with minimum on-time of 22ns. Its integrated 31mΩ PMOS high-side and 8mΩ NMOS low-side switches support up to 100% duty cycle for low-dropout operation.
It supports three selectable operating modes-Burst Mode® (40µA IQ), pulse-skip, and forced continuous-via MODE/SYNC pin logic level, while internal compensation, soft-start, power-good monitoring, and overvoltage/overtemperature protection ensure robust system-level integration without external loop components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, USB PD, or 3.3V/5V rails without pre-regulation. |
| VOUT Range | 0.5V to VIN - supports core supplies for FPGA, ASIC, and µP requiring sub-1V rails with tight tolerance. |
| Output Accuracy | ±1% over temperature - ensures stable voltage under thermal stress in automotive under-hood environments. |
| Switching Frequency | 1MHz to 3MHz (RT-programmable or SYNC-locked) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Efficiency at 4A | Up to 93% at 3.3VIN/1.2VOUT, 2MHz - reduces thermal load in space-constrained modules and improves battery runtime. |
| Junction Temp Range | –40°C to +150°C - qualified per AEC-Q100 Grade H, suitable for engine control units and ADAS domain controllers. |
| IQ in Burst Mode | 40µA - extends battery life in always-on sensor nodes and telematics modules during idle states. |
Pinout & Package
The LTC3308AHV#TRPBF is housed in a thermally enhanced 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13) soldered directly to PCB ground plane for low θJA = 51°C/W and efficient heat dissipation in high-density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGND (1) | Analog ground reference | Remote sense return for FB and RT; must connect to output capacitor negative terminal to minimize load regulation error. |
| EN (2) | Enable control input | 400mV precision threshold with hysteresis; enables sequencing with upstream regulators via resistor divider. |
| VIN (3, 8) | Main power input | Dual pins reduce trace inductance and IR drop; require local 4.7µF ceramic bypass to PGND/AGND. |
| PGND (4, 7, 13) | Power ground return | Primary thermal and electrical path; exposed pad (13) must be connected to large PCB ground plane with ≥6 vias. |
| SW (5, 6) | Switch node | High-current connection to inductor; both pins must be shorted with wide copper pour to minimize ringing and EMI. |
| MODE/SYNC (9) | Mode selection & clock sync | Logic level sets Burst (high), Pulse Skip (low), or Forced Continuous (float); accepts 1–3MHz external clock for EMI reduction. |
| RT (10) | Frequency programming | Resistor to AGND sets fSW; open or tied to VIN defaults to 2MHz; ignored when external clock applied to MODE/SYNC. |
| PGOOD (11) | Power status indicator | Open-drain output pulled low if VOUT falls below 98% or exceeds 110% of target; includes 120µs delay and hysteresis. |
| FB (12) | Feedback input | Regulates to 500mV; connects to resistor divider between VOUT and AGND; phase lead cap optional for transient optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® architecture | Reduces radiated EMI by >30dB compared to standard buck converters, eliminating need for metal shielding in sensitive RF modules. |
| Low-ripple Burst Mode® | Delivers 40µA quiescent current while maintaining <10mVPP output ripple - critical for noise-sensitive analog and ADC subsystems. |
| 22ns minimum on-time | Enables high step-down ratios (e.g., 5V→0.6V at 2MHz) with small inductors, reducing solution size and cost in compact POL designs. |
| Internal compensation | Eliminates external compensation network, simplifying layout and reducing BOM count while maintaining stability across all load conditions. |
| AEC-Q100 Grade H qualification | Validated for automotive applications up to +150°C junction temperature, including engine control, infotainment, and ADAS power domains. |
Applications
| Automotive Engine Control Unit (ECU) | FPGA Core Supply (POL) |
|---|---|
Use Scenario: Regulating 3.3V input to 1.0V core rail for microcontroller in under-hood ECU exposed to 150°C ambient. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated, low-noise, high-reliability power with thermal fault protection. Use Value: Maintains ±1% output accuracy and survives 150°C junction temperature, ensuring functional safety compliance without derating. |
Use Scenario: Point-of-load conversion for Xilinx Artix-7 FPGA core requiring 1.0V/4A with fast transient response to logic switching. IC Role / Device Role / Timing Role: High-bandwidth DC/DC controller with 22ns min on-time and peak current mode control for sub-µs load-step recovery. Use Value: Achieves <50mV undershoot on 1A/µs load step without external compensation, minimizing FPGA configuration errors. |
| Battery-Powered Telematics Module | Optical Networking Line Card |
Use Scenario: Powering LTE modem and GPS receiver from single-cell Li-ion (2.8V–4.2V) with ultra-low standby current. IC Role / Device Role / Timing Role: Efficient step-down regulator operating in Burst Mode® during sleep cycles and PWM at full load. Use Value: Extends battery life by 3× vs. non-Burst alternatives due to 40µA IQ, while maintaining fast wake-up response. |
Use Scenario: Generating 1.2V/4A for SerDes transceivers on telecom line card with strict EMI limits in 1RU chassis. IC Role / Device Role / Timing Role: Low-EMI power supply using Silent Switcher® architecture and 2MHz fixed frequency to avoid band-sensitive frequencies. Use Value: Passes CISPR-32 Class B radiated emissions without ferrite beads or shielded inductors, saving board area and cost. |
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 |
|---|---|---|---|
| MP2451DT-LF-Z | 3A rated, 2MHz fixed frequency, no SYNC or MODE pin, lower temp grade (–40°C to +125°C), higher RDS(ON) (110mΩ/140mΩ). | Not qualified for automotive under-hood use; lacks Burst Mode® and programmable frequency; limited to industrial/commercial POL. | Select when cost sensitivity outweighs thermal/EMI requirements and 4A current headroom is unnecessary. |
| TPS543320RHLR | 4A, 1.5MHz–2.2MHz programmable, integrated MOSFETs, but larger 3mm × 3mm QFN, no AEC-Q100 qualification, higher IQ (75µA). | Targeted at enterprise servers and networking; lacks automotive qualification and Silent Switcher® EMI performance. | Prefer for high-volume datacom where footprint is less constrained and automotive reliability is not required. |
Compared with MP2451DT-LF-Z and TPS543320RHLR, the LTC3308AHV#TRPBF uniquely combines AEC-Q100 Grade H qualification, Silent Switcher® EMI suppression, 40µA Burst Mode® IQ, and 2mm × 2mm footprint-making it the only choice for space- and noise-critical automotive and portable electronics demanding 4A at 150°C.
Availability
LTC3308AHV#TRPBF is available at Aetrix Electronics and suitable for automotive engine control units, FPGA core supplies, battery-powered telematics modules, and optical networking line cards requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3308AHV#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets with precision power, sensing, and signal chain solutions.
The LTC3308A family delivers ultra-small, high-efficiency, low-EMI synchronous buck regulators for space-constrained, noise-sensitive, and thermally demanding applications-including automotive ADAS, portable medical devices, and high-speed datacom infrastructure.
FAQ
What is the maximum junction temperature rating for the LTC3308AHV#TRPBF?
The LTC3308AHV#TRPBF is rated for operation up to +150°C junction temperature and is qualified per AEC-Q100 Grade H. This specification is explicitly confirmed in the Absolute Maximum Ratings table and Operating Junction Temperature Range section of the official datasheet Rev. A, making it suitable for under-hood automotive applications where ambient temperatures exceed 105°C.
Does the LTC3308AHV#TRPBF support external clock synchronization?
Yes, the LTC3308AHV#TRPBF supports external clock synchronization via the MODE/SYNC pin. When driven with a 1MHz–3MHz square wave, the internal PLL locks to the external frequency, forcing operation in forced continuous mode with automatic slope compensation adaptation - a capability verified in the "Synchronizing the Oscillator to an External Clock" section of the datasheet.
What is the typical quiescent current of the LTC3308AHV#TRPBF in Burst Mode operation?
The LTC3308AHV#TRPBF draws 40µA typical quiescent current in Burst Mode® operation while sleeping, as specified in the Electrical Characteristics table (VIN Quiescent Current in Burst Mode Operation, Sleeping). This value is measured at VIN = 3.3V and is confirmed across temperature in Figure G14 of the datasheet.
Can the LTC3308AHV#TRPBF operate with 100% duty cycle?
Yes, the LTC3308AHV#TRPBF supports up to 100% duty cycle operation, enabling low-dropout regulation when input voltage approaches output voltage. This is explicitly stated in the FEATURES section and detailed in the "Dropout Operation" subsection of the datasheet Rev. A, where it explains conduction through the internal P-channel MOSFET during extended on-time.
What package type and dimensions does the LTC3308AHV#TRPBF use?
The LTC3308AHV#TRPBF uses a 12-lead 2mm × 2mm × 0.74mm LQFN package with exposed PGND pad (Pin 13), as documented in the PIN CONFIGURATION diagram and ORDER INFORMATION table. The package is designated "LQFN (Laminate Package with QFN Footprint)" and requires soldering the exposed pad to PCB ground for thermal and electrical performance.
LTC3308AHV#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:
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-LQFN (2x2)
LTC3308AHV#TRPBF FAQ
1.How can I place an order for LTC3308AHV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3308AHV#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 LTC3308AHV#TRPBF reliable?
The price and inventory of LTC3308AHV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3308AHV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3308AHV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3308AHV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3308AHV#TRPBF?
LTC3308AHV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3308AHV#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 LTC3308AHV#TRPBF?
For technical support, including LTC3308AHV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3308AHV#TRPBF requirements.
6.How does Aetrix verify that LTC3308AHV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3308AHV#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 LTC3308AHV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3308AHV#TRPBF?
All LTC3308AHV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3308AHV#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 LTC3308AHV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3308AHV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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