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Analog Devices Inc. LTC3311JV#TRMPBF
- Part No.:
- LTC3311JV#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311JV#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:270
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Product details
Overview
LTC3311JV#TRMPBF from Analog Devices is a monolithic, Silent Switcher® 1 synchronous step-down DC/DC converter in a thermally enhanced 18-lead 3mm × 3mm LQFN package, delivering up to 12.5A output current from 2.25V–5.5V input, with 500mV feedback reference, ±1% VOUT accuracy (with remote sense), and 35ns minimum on-time.
For engineers reviewing the LTC3311JV#TRMPBF datasheet, LTC3311JV#TRMPBF pinout, LTC3311JV#TRMPBF application, or LTC3311JV#TRMPBF equivalent, key selection criteria include ultralow EMI compliance (CISPR 25 Class 5), AEC-Q100 qualification for automotive use, programmable switching frequency up to 5MHz, and support for multiphase paralleling in forced continuous mode.
Technical Context
The LTC3311JV#TRMPBF employs constant-frequency peak current mode control with internal 500mV reference and precision enable threshold (400mV, ±60mV hysteresis). Its Silent Switcher 1 architecture integrates split power planes and differential switch node routing to suppress common-mode EMI without requiring external filters.
It supports dual operating modes via MODE/SYNC pin: pulse-skipping for light-load efficiency or forced continuous conduction for predictable ripple and multi-phase synchronization. The device implements active voltage positioning (AVP) only in LTC3311-X variants - the LTC3311JV#TRMPBF is the standard LTC3311 variant with external FB divider and no AVP.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.25V to 5.5V - enables direct regulation from single-cell Li-ion, 3.3V, or 5V rails without pre-regulation. |
| IOUT Max | 12.5A - supports high-current FPGA, ASIC, and µP core supplies with single-chip integration. |
| VFB Reference | 500mV ±5mV - allows precise low-VOUT regulation (e.g., 0.5V to VIN) using standard resistor dividers. |
| Switching Frequency | 0.5MHz to 5MHz (RT-programmable) - permits optimization of inductor size vs. efficiency (e.g., 2MHz typical with 274kΩ). |
| Min On-Time | 35ns - enables high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping or instability. |
| Thermal Rating | Junction temp range –40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and industrial environments. |
| Efficiency | Up to 95% at 12.5A (VIN=3.3V, VOUT=1.2V, fSW=2MHz) - enabled by 4.5mΩ NMOS and 16mΩ PMOS integrated power switches. |
Pinout & Package
Package: 18-lead 3mm × 3mm LQFN with exposed PGND pad (Pin 19), θJA = 42°C/W, θJCbottom = 9°C/W. Exposed pad must be soldered to PCB ground plane with multiple thermal vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable input with precision threshold | 400mV rising threshold (±60mV hysteresis); 1μA shutdown current; supports resistor-divider VIN enable sequencing. |
| AGND (2) | Remote sense ground reference | Kelvin connection point for FB divider low-side; rejects 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 inductance; require local low-ESR ceramic bypassing to PGND. |
| PGND (5,10,19) | Power ground return path | Three dedicated pins + exposed pad form primary thermal and current return path; must connect to large PCB ground plane. |
| SW (6–9) | Switch node outputs | Four parallel SW pins minimize loop inductance; connect directly to inductor with short, wide copper traces. |
| MODE/SYNC (13) | Mode control & clock I/O | Selects pulse-skipping or forced continuous mode; accepts external sync clock (0.5–2.25MHz) or outputs internal clock. |
| PGOOD (14) | Open-drain power-good indicator | Asserts high when VOUT is within ±3% of regulation; 125μs delay filters transient dips; supports wired-OR in multi-phase systems. |
| RT (15) | Oscillator frequency programming | Connects to AGND via resistor (e.g., 274kΩ → 2MHz); also sets phase offset in multiphase configurations. |
| SSTT (16) | Soft-start, tracking, temperature monitor | 10μA current source for soft-start capacitor; tracks FB during startup; settles to ~4mV/°C junction temp reading post-startup. |
| ITH (17) | Loop compensation node | Internal error amplifier output; connects to AGND via RC network to set bandwidth and phase margin. |
| FB (18) | Feedback input (LTC3311 variant) | Regulates to 500mV; connects to resistive divider from VOUT; supports optional CFF from VOUT to FB for transient optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 Architecture | Reduces radiated EMI by >30dB vs. conventional buck converters; meets CISPR 25 Class 5 limits without added filtering. |
| 100% Duty Cycle Operation | Enables dropout operation down to VIN ≈ VOUT + ILOAD × RDS(ON)_PMOS, critical for battery-powered systems near end-of-discharge. |
| Programmable Frequency (0.5–5MHz) | Allows trade-off between small magnetics (high-f) and efficiency (low-f); RT pin supports precise setting and multi-phase phasing. |
| Dual-Mode Control (Pulse-Skipping / FCCM) | Pulse-skipping maximizes light-load efficiency; forced continuous ensures fixed-frequency operation for EMI predictability and multi-phase alignment. |
| Robust Protection Suite | Includes output overvoltage (105–115% VOUT trip), thermal shutdown, output short-circuit recovery via SSTT-triggered soft-start, and valley current limiting. |
| AEC-Q100 Qualified (Grade 1) | Validated for automotive applications including infotainment, ADAS domain controllers, and body electronics with full reliability reporting. |
Applications
| Automotive Infotainment Power | FPGA Core Supply |
|---|---|
|
Use Scenario: Powering SoC and GPU cores in head-unit systems with strict CISPR 25 EMI limits and wide input voltage swing (cold crank to load dump). IC Role / Device Role / Timing Role: Primary 12.5A POL regulator converting 5V rail to 1.2V core voltage; operates in forced continuous mode synchronized to system clock. Use Value: Silent Switcher architecture eliminates need for external EMI filters, reducing BOM cost and board area while meeting OEM EMC requirements. |
Use Scenario: Delivering tightly regulated, low-noise 0.85V supply to high-speed FPGA transceivers with fast load transients (0–10A in <100ns). IC Role / Device Role / Timing Role: High-bandwidth current-mode buck controller with 35ns min on-time and 500mV reference enabling sub-1V accuracy. Use Value: Fast transient response and remote sensing maintain ±1% VOUT accuracy across PCB voltage drops, ensuring signal integrity. |
| Industrial PLC CPU Module | 5G Baseband Radio PSU |
|
Use Scenario: Providing 1.0V/12.5A core power to ARM-based PLC processors operating continuously at 85°C ambient in sealed enclosures. IC Role / Device Role / Timing Role: Thermally robust DC/DC converter with 150°C max junction rating and exposed-pad LQFN package for conduction cooling. Use Value: AEC-Q100 qualification and -40°C to +150°C operation ensure long-term reliability without derating in harsh industrial environments. |
Use Scenario: Generating 0.75V/12.5A supply for RF transceiver ASICs in compact 5G small cells where board space and thermal density are constrained. IC Role / Device Role / Timing Role: High-frequency (up to 5MHz) buck converter enabling 0805-size inductors and 0402 ceramic capacitors. Use Value: 3mm × 3mm footprint and high switching frequency reduce total solution size by >40% vs. 2MHz alternatives while maintaining >92% efficiency. |
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 | Pin-compatible 10A variant; same 3mm × 3mm LQFN, Silent Switcher 1, but lower current rating and no SSTT temperature monitoring. | Best suited for ≤10A loads where die temperature monitoring is not required; lacks AVP and some protection features of LTC3311. | Select when 10A suffices and cost reduction is prioritized over 12.5A headroom and thermal telemetry. |
| MP2960GQH-Z | Monolithic 12A buck with 2.4V–18V input; higher VIN range but no AEC-Q100 rating, no Silent Switcher EMI suppression, and larger 4mm × 4mm QFN. | Targeted at industrial/commercial 12V-input systems; unsuitable for automotive due to missing qualification and higher EMI. | Choose only for non-automotive 12V-rail applications where input voltage exceeds 5.5V and EMI is less critical. |
Compared with LTC3310SIV#TRMPBF and MP2960GQH-Z, the LTC3311JV#TRMPBF uniquely combines AEC-Q100 qualification, 12.5A capability, Silent Switcher EMI performance, and integrated die temperature monitoring in a 3mm × 3mm footprint-making it the only option qualified for safety-critical automotive core power.
Availability
LTC3311JV#TRMPBF is available at Aetrix Electronics and suitable for automotive infotainment, FPGA core supplies, and industrial PLC CPU modules requiring stable component supply, long lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for LTC3311JV#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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC3311JV#TRMPBF belongs to Analog Devices' Power by Linear™ family of high-efficiency, low-EMI monolithic DC/DC converters designed specifically for demanding automotive, computing, and telecom POL applications where size, thermal performance, and EMI compliance are critical.
FAQ
What is the maximum output current capability of the LTC3311JV#TRMPBF?
The LTC3311JV#TRMPBF delivers up to 12.5A of continuous output current when properly heatsinked on a 4-layer PCB with 2oz copper and thermal vias to internal ground planes. Derating is required above 85°C ambient; full 12.5A is guaranteed from –40°C to +105°C case temperature per datasheet Figure 1.
Does the LTC3311JV#TRMPBF support remote voltage sensing?
Yes, the LTC3311JV#TRMPBF supports true Kelvin remote sensing via its dedicated AGND pin, which serves as the reference for the FB divider's low-side resistor. This allows compensation for up to ±100mV ground potential difference between the IC and load, ensuring ±1% VOUT accuracy at the point of load.
Is the LTC3311JV#TRMPBF pin-compatible with other devices in the LTC3311 family?
Yes, the LTC3311JV#TRMPBF shares identical 18-lead 3mm × 3mm LQFN pinout and footprint with all LTC3311 and LTC3311-X variants (e.g., LTC3311-0.85, LTC3311HV), enabling drop-in replacement across output voltage options and temperature grades without PCB redesign.
How does the Silent Switcher architecture in the LTC3311JV#TRMPBF reduce EMI?
The LTC3311JV#TRMPBF implements Silent Switcher 1 via symmetrical, opposing switch node layouts and integrated input capacitors that cancel magnetic fields. Measured radiated emissions fall >30dB below CISPR 25 Class 5 peak limits at 10A load, eliminating need for ferrite beads or metal shields in most automotive designs.
What protection features are integrated into the LTC3311JV#TRMPBF?
The LTC3311JV#TRMPBF integrates output overvoltage protection (105–115% VOUT trip), thermal shutdown, output short-circuit recovery (via SSTT-triggered soft-start), valley current limiting, and undervoltage lockout. It also provides PGOOD monitoring with 125μs delay to reject false trips from transient load steps.
LTC3311JV#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Silent Switcher®1
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-LQFN (3x3)
LTC3311JV#TRMPBF FAQ
1.How can I place an order for LTC3311JV#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311JV#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 LTC3311JV#TRMPBF reliable?
The price and inventory of LTC3311JV#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311JV#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3311JV#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311JV#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311JV#TRMPBF?
LTC3311JV#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311JV#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 LTC3311JV#TRMPBF?
For technical support, including LTC3311JV#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311JV#TRMPBF requirements.
6.How does Aetrix verify that LTC3311JV#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311JV#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 LTC3311JV#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3311JV#TRMPBF?
All LTC3311JV#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311JV#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 LTC3311JV#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3311JV#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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