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Analog Devices Inc. LTC3311SIV#TRMPBF
- Part No.:
- LTC3311SIV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311SIV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:577
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Product details
Overview
LTC3311SIV#TRMPBF from Analog Devices is a monolithic, Silent Switcher 2 synchronous step-down DC/DC converter delivering up to 12.5A output current from a 2.25V–5.5V input, featuring 500mV feedback reference, 35ns minimum on-time, and 5MHz programmable switching frequency. It serves as a high-density core supply for FPGA, ASIC, and µP in automotive and industrial power systems.
For engineers reviewing the LTC3311SIV#TRMPBF datasheet, LTC3311SIV#TRMPBF pinout, LTC3311SIV#TRMPBF application, or LTC3311SIV#TRMPBF equivalent, key selection criteria include its AEC-Q100 qualification, ±1% VOUT accuracy with remote sense, thermally enhanced 3mm × 3mm LQFN package, and support for multi-phase paralleling in forced continuous mode.
Technical Context
The LTC3311SIV#TRMPBF employs constant-frequency peak current mode control with internal hot-loop bypass capacitors to achieve ultralow EMI emissions and high efficiency at up to 5MHz switching. Its architecture integrates dual power switches (4.5mΩ NMOS / 16mΩ PMOS) and supports clock synchronization via MODE/SYNC pin with PLL-based tracking.
It delivers 100% duty cycle operation for low-dropout regulation and includes precision enable threshold (400mV), die temperature monitoring via SSTT pin, and configurable pulse-skip or forced-continuous mode. Output voltage is set by a resistive divider referenced to a stable 500mV internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports wide-input battery and intermediate bus applications including 3.3V and 5V rails. |
| VOUT Range | 0.5V to VIN - enables sub-1V core supplies for modern processors and FPGAs. |
| Output Current | Up to 12.5A - sufficient for high-performance digital load point requirements without external current sharing. |
| Feedback Accuracy | ±1% with remote sense - maintains tight regulation despite PCB trace resistance between IC and load. |
| Switching Frequency | Programmable 0.5MHz to 5MHz - allows optimization of inductor size, transient response, and efficiency trade-offs. |
| Min On-Time | 35ns - enables high step-down ratios (e.g., 5V→0.5V) at 2MHz without pulse skipping. |
| Shutdown Current | 1µA - ensures ultra-low system standby power in always-on automotive modules. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJCbottom = 9°C/W, thermally optimized for high-current DC/DC conversion.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with hysteresis; direct connection to VIN enables device, pull-to-ground disables with 1µA shutdown current. |
| AGND (2) | Remote sense ground | Kelvin connection point for FB divider low-side; compensates for up to ±100mV ground offset between IC and load. |
| VIN (3,4,11,12) | Main input power supply | Four parallel pins reduce IR drop and thermal stress; must be shorted and locally bypassed to PGND with low-ESR ceramics. |
| PGND (5,10,19) | Power ground return | Three dedicated pins plus exposed pad form primary thermal path; requires large copper area and multiple vias to internal ground plane. |
| SW (6–9) | Switch node outputs | Four paralleled switch terminals minimize loop inductance; connect directly to inductor with wide, low-inductance traces. |
| MODE/SYNC (13) | Multi-phase sync & mode control | Accepts external clock (0.5–2.25MHz) or outputs synchronized clock; selects pulse-skip vs forced-continuous operation. |
| PGOOD (14) | Power-good status flag | Open-drain output asserting when VOUT is within ±3% of regulation; includes 125µs delay to reject transient glitches. |
| RT (15) | Oscillator frequency programming | Resistor-to-AGND sets fSW from 0.5MHz to 5MHz per RT = 568·fSW−1.08 (kΩ, MHz). |
| SSTT (16) | Soft-start, tracking, temp monitor | Charges external capacitor for controlled ramp-up; after startup, outputs ~4mV/°C for die temperature monitoring. |
| ITH (17) | Current limit & loop compensation | Error amplifier output node; connects to AGND via RC network to stabilize control loop and set peak current limit. |
| FB (18) | Feedback voltage input | Regulated to 500mV ±1%; connects to resistor divider from VOUT to AGND for precise output voltage setting. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 Architecture | Integrated VIN bypass capacitors and symmetrical layout reduce radiated EMI to meet CISPR 25 Class 5 limits without external filters. |
| Thermally Enhanced LQFN | 3mm × 3mm footprint with exposed PGND pad achieves θJCbottom = 9°C/W - critical for 12.5A continuous operation in compact spaces. |
| AEC-Q100 Qualified | Rated for −40°C to +125°C junction temperature with automotive-grade reliability testing - suitable for ADAS, infotainment, and body control modules. |
| Multi-Phase Paralleling Support | Configurable MODE/SYNC pin enables forced continuous mode and phase interleaving across multiple LTC3311SIV#TRMPBF units for >12.5A loads. |
| Robust Protection Suite | Includes output overvoltage protection (105–115% VOUT), thermal shutdown, output short-circuit recovery via SSTT-triggered soft-start, and valley current limiting. |
Applications
| Automotive ADAS Core Supply | Industrial FPGA Power Rail |
|---|---|
Use Scenario: Powers image signal processor (ISP) and radar SoC in 24V vehicle systems using 5V intermediate bus. IC Role / Device Role / Timing Role: Primary 1.2V/12.5A POL regulator with AEC-Q100 qualification and low EMI for noise-sensitive sensor fusion. Use Value: Silent Switcher 2 compliance eliminates need for external EMI filters, reducing BOM cost and board area in space-constrained camera modules. |
Use Scenario: Supplies 0.85V core voltage to Xilinx Kintex Ultrascale+ FPGA in factory automation controller. IC Role / Device Role / Timing Role: High-accuracy, fast-transient buck converter with remote sense and 35ns min on-time for dynamic load steps. Use Value: ±1% VOUT accuracy with Kelvin sensing ensures reliable FPGA operation despite 50mV PCB ground bounce during logic switching. |
| Telecom Server DDR Memory | Medical Imaging ASIC Supply |
Use Scenario: Delivers 1.2V/10A to DDR4 memory subsystem in 1RU edge server with strict thermal envelope. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down regulator operating at 2MHz to minimize inductor size and improve transient response. Use Value: 4.5mΩ NMOS + 16mΩ PMOS switches enable >92% efficiency at 10A, reducing heat sink requirements in densely packed compute blades. |
Use Scenario: Provides clean, regulated 1.8V supply to high-speed analog front-end ASIC in portable ultrasound equipment. IC Role / Device Role / Timing Role: Low-noise, low-ripple DC/DC converter with PGOOD monitoring and thermal derating for safety-critical diagnostics. Use Value: Die temperature monitoring via SSTT pin enables real-time thermal throttling to maintain ASIC performance within medical-grade reliability limits. |
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 |
|---|---|---|---|
| LTC3310SIV#TRMPBF | Lower max output current (10A vs 12.5A); identical pinout, package, and feature set except reduced current capability. | Suitable where 10A suffices and thermal margin is less constrained; shares same layout and firmware interface. | Select when full 12.5A headroom is unnecessary and cost optimization is prioritized. |
| TPS546D24RSAR | 6V–18V input range (vs 2.25V–5.5V); higher RDS(ON) (5.5mΩ/12mΩ); no integrated hot-loop caps; requires external compensation. | Better suited for higher-input industrial or telecom systems; lacks Silent Switcher 2 EMI performance and automotive qualification. | Choose only if input voltage exceeds 5.5V or if TI ecosystem integration outweighs EMI and qualification advantages. |
Compared with LTC3310SIV#TRMPBF and TPS546D24RSAR, the LTC3311SIV#TRMPBF uniquely combines AEC-Q100 qualification, 12.5A capability in 3mm × 3mm, and certified CISPR 25 Class 5 EMI performance - making it the only option for automotive-compliant, high-current, ultra-compact POL designs.
Availability
LTC3311SIV#TRMPBF is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial FPGA power rails, telecom server DDR memory supplies, and medical imaging ASIC supplies requiring stable component supply and long-term production continuity.
Supply support for LTC3311SIV#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, industrial, automotive, and communications markets since 1965.
The LTC3311SIV#TRMPBF belongs to the Silent Switcher® 2 DC/DC converter product line, engineered specifically for high-current, low-EMI power delivery in space-constrained automotive and industrial applications where thermal density and electromagnetic compatibility are critical.
FAQ
What is the maximum output current capability of the LTC3311SIV#TRMPBF?
The LTC3311SIV#TRMPBF delivers up to 12.5A of continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB with 2 oz copper, 10 cm² exposed PGND copper). Derating applies above 85°C ambient or with reduced airflow; full 12.5A is validated per datasheet Figure 1 with Wurth HCM5030 74435030010 inductor at 2MHz.
Does the LTC3311SIV#TRMPBF support synchronization to an external clock source?
Yes, the LTC3311SIV#TRMPBF supports clock synchronization via its MODE/SYNC pin, accepting external square-wave inputs from 0.5MHz to 2.25MHz. During synchronization, it operates in forced continuous mode and automatically adapts slope compensation; removal of the external clock triggers a graceful return to the default 2MHz frequency within ~20µs.
How does the LTC3311SIV#TRMPBF achieve low EMI performance without external filters?
The LTC3311SIV#TRMPBF uses Silent Switcher 2 architecture with integrated VIN bypass capacitors and symmetrical hot-loop layout to minimize magnetic field radiation. Measured CISPR 25 Class 5 radiated emissions on DC3018A demo board (3.3V→1.2V/10A, 2MHz) fall >20dB below peak limits - eliminating need for ferrite beads or shielded inductors in most automotive layouts.
What is the purpose of the SSTT pin on the LTC3311SIV#TRMPBF?
The SSTT pin on the LTC3311SIV#TRMPBF serves three functions: (1) soft-start timing via external capacitor charge, (2) voltage tracking during startup for supply sequencing, and (3) post-startup die temperature monitoring (~4mV/°C). During faults like output short-circuit, SSTT is pulled low to initiate automatic recovery soft-start.
Is the LTC3311SIV#TRMPBF qualified for automotive applications?
Yes, the LTC3311SIV#TRMPBF is AEC-Q100 qualified for automotive applications (Grade I: −40°C to +125°C junction temperature) and manufactured under controlled automotive processes. The "I" in "SIV" denotes industrial/automotive grade; the #TRMPBF suffix confirms tape-and-reel packaging compliant with automotive logistics standards.
LTC3311SIV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®2
- Package/Case:
- 18-TFQFN 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:
- 12.5A
- Frequency - Switching:
- 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311SIV#TRMPBF FAQ
1.How can I place an order for LTC3311SIV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311SIV#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 LTC3311SIV#TRMPBF reliable?
The price and inventory of LTC3311SIV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311SIV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3311SIV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311SIV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311SIV#TRMPBF?
LTC3311SIV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311SIV#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 LTC3311SIV#TRMPBF?
For technical support, including LTC3311SIV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311SIV#TRMPBF requirements.
6.How does Aetrix verify that LTC3311SIV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311SIV#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 LTC3311SIV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3311SIV#TRMPBF?
All LTC3311SIV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311SIV#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 LTC3311SIV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3311SIV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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