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Analog Devices Inc. LTC3311SEV#TRPBF
- Part No.:
- LTC3311SEV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311SEV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,316
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Product details
Overview
LTC3311SEV#TRPBF 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 ±1% VOUT accuracy with remote sense. It operates in forced continuous or pulse-skip mode and supports multi-phase paralleling for higher power systems-used in FPGA core supplies and telecom POL applications.
For engineers reviewing the LTC3311SEV#TRPBF datasheet, LTC3311SEV#TRPBF pinout, LTC3311SEV#TRPBF application, or LTC3311SEV#TRPBF equivalent, key selection criteria include its 3mm × 3mm LQFN thermal performance, 5MHz programmable switching frequency, AEC-Q100 qualification, and integrated output short-circuit protection with valley-current limiting.
Technical Context
The LTC3311SEV#TRPBF employs constant-frequency peak current mode control with internal hot-loop bypass capacitors to minimize EMI while sustaining high efficiency at up to 5MHz switching. Its dual MOSFET power stage features 4.5mΩ NMOS and 16mΩ PMOS RDS(ON), enabling low dropout operation down to 100% duty cycle.
It integrates a die temperature monitor via the SSTT pin, programmable soft-start with voltage tracking, precision 400mV enable threshold, and PGOOD with 97–99% VOUT rising threshold. The MODE/SYNC pin enables external clock synchronization (0.5–2.25MHz), multiphase configuration, and mode selection between forced continuous and pulse-skip operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - supports single-cell Li-ion, 3.3V/5V intermediate bus, and automotive cold-crank conditions. |
| Max Output Current | 12.5A - sustained delivery enabled by thermally enhanced 3mm × 3mm LQFN package and low RDS(ON) switches. |
| Feedback Reference | 500mV ±1% - enables precise low-voltage regulation (e.g., 0.5V–1.2V) with remote sensing for <±100mV ground offset tolerance. |
| Switching Frequency | Programmable 0.5–5MHz via RT resistor - allows optimization of inductor size, transient response, and efficiency trade-offs. |
| Min On-Time | 35ns - supports high VIN/VOUT ratios (e.g., 5V→1.2V at 2MHz) without pulse skipping or instability. |
| Shutdown Current | 1µA - ensures ultra-low system standby power in battery-backed or always-on applications. |
| Thermal Rating | Junction temp range –40°C to +125°C - qualified per AEC-Q100 Grade 1 for automotive under-hood use. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJA = 42°C/W, requiring soldering of exposed pad to PCB ground plane for thermal and EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Precision 400mV threshold with hysteresis; direct tie to VIN enables operation; open or low disables regulator with 1µA shutdown current. |
| AGND (2) | Remote sense ground | Kelvin connection point for FB divider low-side node-rejects PCB ground bounce and enables ±100mV remote ground offset compensation. |
| VIN (3,4,11,12) | Main power input | Four parallel inputs for low-impedance path to internal top switch and bias circuitry; must be decoupled locally with low-ESR ceramics. |
| PGND (5,10,19) | Power ground return | High-current return path for bottom switch; Pin 19 is exposed thermal pad-must be soldered to large PCB ground plane with multiple vias. |
| SW (6–9) | Switch node | Four parallel outputs tied internally to inductor; requires short, wide copper traces to minimize parasitic inductance and EMI. |
| MODE/SYNC (13) | Multi-phase sync interface | Configurable as external clock input (0.5–2.25MHz), clock output, or PWM mode selector (pulse-skip vs. forced continuous). |
| PGOOD (14) | Power status indicator | Open-drain output pulled low when VOUT deviates >3% from regulation or during fault-125µs delay filters transients. |
| RT (15) | Oscillator programming | Resistor-to-AGND sets switching frequency from 0.5MHz to 5MHz; RT = 274kΩ yields 2MHz nominal operation. |
| SSTT (16) | Soft-start/track/temp monitor | 10µA current source for soft-start capacitor; tracks FB during startup; transitions to ~4mV/°C die temperature voltage post-startup. |
| ITH (17) | Current limit compensation | Error amplifier output node-connects to AGND via RC network to set loop bandwidth and transient response. |
| FB (18) | Voltage feedback input | Regulated to 500mV; connects to resistive divider from VOUT; phase-lead cap from FB to VOUT improves stability and load step response. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher 2 architecture | Integrated VIN bypass capacitors and symmetrical hot-loop layout reduce radiated EMI to meet CISPR 25 Class 5 limits without shielding. |
| Valley-current overload protection | Detects excessive inductor valley current (≥12A typical) and skips switching cycles-prevents saturation and thermal runaway during short circuits. |
| 100% duty cycle operation | Enables dropout regulation down to VIN ≈ VOUT + ILOAD × RDS(ON)_PMOS + ILOAD × DCRIND, critical for low-VIN POL applications. |
| Configurable multi-phase support | MODE/SYNC pin enables synchronized paralleling of multiple LTC3311SEV#TRPBF units-scales output current beyond 12.5A with interleaved ripple reduction. |
| Dual-mode PWM control | Forced continuous mode ensures fixed-frequency operation for EMI-sensitive systems; pulse-skip mode improves light-load efficiency below ~1A. |
Applications
| Server Core Voltage Regulation | Automotive ADAS Power Supply |
|---|---|
|
Use Scenario: Providing tightly regulated 0.8V/1.2V core power to Xilinx Kria KV260 SoC in edge AI inference server. IC Role / Device Role / Timing Role: Primary buck regulator with remote sense, soft-start tracking, and PGOOD sequencing for FPGA power-up coordination. Use Value: ±1% output accuracy and 35ns min on-time ensure stable core voltage across 0.5–5V input transients; Silent Switcher 2 meets server board-level EMC requirements. |
Use Scenario: Generating 1.8V supply for radar sensor MCU in AEC-Q100-compliant 77GHz front-end module. IC Role / Device Role / Timing Role: Automotive-grade POL converter with die temperature monitoring and overvoltage protection for safety-critical subsystems. Use Value: –40°C to +125°C junction rating, 12.5A capability, and valley-current limiting prevent thermal failure during sensor burst-mode operation. |
| Telecom Distributed Power | FPGA I/O Bank Supply |
|
Use Scenario: Point-of-load conversion from 48V intermediate bus (via intermediate 5V rail) to 3.3V for optical transceiver modules. IC Role / Device Role / Timing Role: High-efficiency, high-density step-down stage operating at 2MHz with external clock synchronization to avoid beat frequencies. Use Value: 5MHz max switching frequency enables compact 1.0µH inductors; MODE/SYNC pin allows deterministic timing alignment across multiple rails. |
Use Scenario: Delivering 1.8V/2.5V to Xilinx Versal I/O banks with strict voltage sequencing relative to core and auxiliary rails. IC Role / Device Role / Timing Role: Soft-start and tracking controller using SSTT pin to coordinate ramp rates with adjacent regulators. Use Value: SSTT-based voltage tracking ensures monotonic startup across multiple voltage domains; ±100mV remote sense maintains accuracy despite PCB trace IR drop. |
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 |
|---|---|---|---|
| LTC3310SEV#TRPBF | Lower 8A max output current; identical 3mm × 3mm LQFN package and pinout; same Silent Switcher 2 architecture and feature set. | Not suitable for >8A loads; lacks valley-current limiting (only peak-current limit); no die temperature monitor on SSTT pin. | Select when system load ≤8A and thermal monitoring is unnecessary-reduces BOM cost without layout change. |
| MP2964GQKT-Z | 12A rated; 2.7–16V input; 16-pin QFN; no remote sense; no SSTT temperature monitor; lower EMI performance (no Silent Switcher). | Requires different PCB layout; lacks PGOOD hysteresis and soft-start tracking; not AEC-Q100 qualified. | Consider only for non-automotive, non-EMI-sensitive designs where input voltage exceeds 5.5V and remote sensing is not required. |
Compared with LTC3310SEV#TRPBF and MP2964GQKT-Z, the LTC3311SEV#TRPBF delivers higher current (12.5A vs. 8A/12A), integrated die temperature monitoring, true remote sense accuracy, and certified low-EMI performance-making it optimal for space-constrained, high-reliability FPGA, automotive, and telecom POL designs.
Availability
LTC3311SEV#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, automotive ADAS modules, and telecom distributed power systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3311SEV#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 industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.
The LTC3311S product line delivers ultra-small, low-noise, high-current monolithic buck converters optimized for demanding point-of-load applications in servers, automotive radar, and high-speed data infrastructure-emphasizing EMI robustness, thermal efficiency, and design simplicity.
FAQ
What is the maximum output current capability of the LTC3311SEV#TRPBF?
The LTC3311SEV#TRPBF delivers up to 12.5A of continuous output current under thermal-limited conditions with proper PCB layout-specifically using the exposed PGND pad soldered to a large ground plane and adequate airflow. Its 4.5mΩ NMOS and 16mΩ PMOS switches, combined with the 3mm × 3mm LQFN's low θJA (42°C/W), enable this rating without external heatsinking in typical 70°C ambient environments. Derating applies above 85°C ambient.
Does the LTC3311SEV#TRPBF support remote voltage sensing, and how is it implemented?
Yes, the LTC3311SEV#TRPBF supports true remote voltage sensing via the AGND pin, which serves as the Kelvin return for the FB divider's low-side resistor. Connecting AGND directly to the load's ground reference-separate from the IC's local PGND-compensates for up to ±100mV of PCB trace IR drop. This ensures ±1% VOUT accuracy at the load, critical for low-voltage FPGA and ASIC core supplies where ground bounce degrades regulation.
How does the LTC3311SEV#TRPBF handle output short-circuit conditions?
The LTC3311SEV#TRPBF uses dual-level current limiting: peak-current detection shuts off the top switch, while valley-current monitoring (IVALLEYMAX ≥12A) holds the top switch off if bottom-switch current exceeds safe levels during overload. Upon short-circuit detection, the SSTT pin is pulled low to initiate a controlled soft-start recovery cycle once the fault clears-preventing inrush and ensuring graceful restart without latch-off or manual reset.
Can the LTC3311SEV#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC3311SEV#TRPBF supports external clock synchronization via the MODE/SYNC pin across 0.5MHz to 2.25MHz. When an external square wave is applied, the internal PLL locks to its rising edge, forcing forced continuous mode operation and automatically adjusting slope compensation. Clock removal is detected within 20µs, after which the device smoothly returns to its default 2MHz frequency-enabling deterministic timing in multi-rail systems.
Is the LTC3311SEV#TRPBF qualified for automotive applications, and what grade does it meet?
Yes, the LTC3311SEV#TRPBF is AEC-Q100 qualified for automotive applications. Specifically, the "E" suffix denotes Grade 1 qualification, guaranteeing operation from –40°C to +125°C junction temperature with full reliability testing including HTOL, TC, and ESD. It is approved for use in ADAS, infotainment, and body electronics-unlike the "I" grade, which is industrial-rated only.
LTC3311SEV#TRPBF 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)
LTC3311SEV#TRPBF FAQ
1.How can I place an order for LTC3311SEV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311SEV#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 LTC3311SEV#TRPBF reliable?
The price and inventory of LTC3311SEV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311SEV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3311SEV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311SEV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311SEV#TRPBF?
LTC3311SEV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311SEV#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 LTC3311SEV#TRPBF?
For technical support, including LTC3311SEV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311SEV#TRPBF requirements.
6.How does Aetrix verify that LTC3311SEV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311SEV#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 LTC3311SEV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3311SEV#TRPBF?
All LTC3311SEV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311SEV#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 LTC3311SEV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3311SEV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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