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Analog Devices Inc. LTC3311HV#TRPBF
- Part No.:
- LTC3311HV#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 18-TFQFN Exposed Pad
- Datasheet:
-
LTC3311HV#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 12.5A 18LQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,695
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Product details
Overview
LTC3311HV#TRPBF from Analog Devices is a monolithic, Silent Switcher® 1 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-skipping mode and supports multi-phase parallel operation for higher power systems.
For engineers reviewing the LTC3311HV#TRPBF datasheet, LTC3311HV#TRPBF pinout, LTC3311HV#TRPBF application, or LTC3311HV#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed EMI performance (CISPR25 Class 5 compliant), real-world thermal behavior (θJCbottom = 9°C/W), and precise selection guidance for automotive-grade POL supplies.
Technical Context
The LTC3311HV#TRPBF employs constant-frequency peak current mode control with internal 500mV reference and programmable oscillator (0.5–5MHz via RT resistor). Its Silent Switcher 1 architecture integrates dual independent power paths and symmetrical layout to minimize magnetic field coupling and achieve ultralow radiated EMI without shielding.
It supports AEC-Q100 Grade H (–40°C to +150°C junction) operation, features die temperature monitoring via SSTT pin (4mV/°C slope), and implements active voltage positioning (AVP) only on LTC3311-X variants - the LTC3311HV#TRPBF is a standard LTC3311 variant with adjustable output 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 solution. |
| Feedback Voltage | 500mV ±1% - allows precise low-VOUT regulation (e.g., 0.5V to VIN) using standard resistor dividers. |
| Min On-Time | 35ns - supports high step-down ratios (e.g., 5V→0.5V at 2MHz) without pulse skipping instability. |
| Switch RDS(ON) | 4.5mΩ (NMOS) / 16mΩ (PMOS) - delivers >90% efficiency at 12.5A with low conduction loss and thermal rise. |
| Thermal Resistance | θJCbottom = 9°C/W - enables efficient heat transfer to PCB ground plane via exposed PGND pad (Pin 19). |
| EMI Performance | CISPR25 Class 5 peak-compliant - meets stringent automotive radiated emissions limits without external filters. |
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 for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable input with precision threshold | 400mV rising threshold (±60mV hysteresis); 1μA shutdown current enables ultra-low-power 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 | Pins 5/10/19 and exposed pad form unified low-inductance return for bottom switch and thermal conduction. |
| SW (6–9) | Switch node outputs | Four paralleled SW pins drive external inductor; must be routed as single low-inductance copper area. |
| MODE/SYNC (13) | Multi-phase sync & mode control | Accepts external clock (0.5–2.25MHz) or outputs synchronized clock; selects pulse-skipping vs. forced continuous mode. |
| PGOOD (14) | Open-drain power-good indicator | Asserts high when VOUT is within ±2% of regulation; 125µs delay filters transient dips. |
| RT (15) | Oscillator frequency set | Resistor to AGND programs fSW from 0.5MHz to 5MHz; default 274kΩ yields ~2MHz. |
| SSTT (16) | Soft-start, tracking, temp monitor | 10µA internal current charges external cap for controlled ramp; post-startup voltage = 4mV/°C junction temp. |
| ITH (17) | Loop compensation node | Connects Type II/III compensation network (R/C) to AGND; sets bandwidth and phase margin. |
| FB (18) | Feedback input (LTC3311 variant) | Regulated to 500mV; connects to resistive divider from VOUT; supports remote sensing via AGND tie. |
Key Features
| Feature | Design Value |
|---|---|
| Silent Switcher® 1 Architecture | Dual independent power paths with balanced layout reduce magnetic field emissions by >20dB vs. conventional buck. |
| 100% Duty Cycle Operation | Enables dropout regulation down to VIN – IOUT × RDS(ON)_PMOS, critical for battery-powered brownout resilience. |
| Configurable Multi-Phase Support | MODE/SYNC pin enables seamless paralleling of ≥2 LTC3311HV#TRPBF units with interleaved clocks for ripple cancellation. |
| Robust Protection Suite | Includes output overvoltage (105–115% VOUT), thermal shutdown, short-circuit recovery via SSTT-triggered soft-start, and valley current limiting. |
| AEC-Q100 Qualified (Grade H) | Validated for automotive under-hood applications with guaranteed operation from –40°C to +150°C junction temperature. |
Applications
| FPGA Core Supply | Automotive ADAS Domain Controller |
|---|---|
|
Use Scenario: Powering Xilinx Versal or Intel Agilex FPGA core rails requiring 0.8V/12A with tight transient response and low noise. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with remote sense, soft-start tracking, and PGOOD sequencing signal. Use Value: 35ns min-on-time enables stable 0.8V output at 2MHz switching; ±1% VOUT accuracy ensures logic compliance across temperature. |
Use Scenario: Providing 1.2V/10A core supply to NVIDIA Orin SoC in autonomous driving ECUs operating in under-hood environments. IC Role / Device Role / Timing Role: AEC-Q100 Grade H POL converter with die temperature monitoring and CISPR25-compliant EMI. Use Value: θJCbottom = 9°C/W and integrated thermal sensor enable reliable 150°C junction operation without derating. |
| Industrial PLC CPU Module | 5G Baseband Radio Unit (RU) |
|
Use Scenario: Delivering 1.8V/8A to ARM Cortex-A72-based controller in DIN-rail mounted PLC with wide ambient temperature range. IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down converter with programmable frequency for EMI tuning. Use Value: 4.5mΩ NMOS RDS(ON) sustains >92% efficiency at full load; RT pin allows 1.8MHz–2.2MHz adjustment to avoid RF band interference. |
Use Scenario: Generating 0.9V/12A for massive MIMO RFICs in outdoor 5G RU where space, thermal density, and EMI are critical constraints. IC Role / Device Role / Timing Role: Compact 3mm×3mm POL regulator with multi-phase capability for current sharing across dual RFIC banks. Use Value: Four paralleled SW pins and four VIN pins minimize parasitic inductance; supports <10mVpp output ripple at 12A with proper layout. |
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 |
|---|---|---|---|
| LTC3310S#TRPBF | Pin-compatible 10A variant; lower current rating, identical package and feature set except reduced top-switch current limit (15A vs. 18A). | Not rated for 12.5A continuous loads; suitable for ≤10A FPGA/ASIC cores where margin is acceptable. | Select LTC3310S#TRPBF only if peak load remains ≤10A and thermal headroom permits lower IOUT derating. |
| MP2960GQ-0000-Z | Monolithic 12A buck with 3.3V–18V input; lacks Silent Switcher EMI suppression, remote sense, and AEC-Q100 qualification. | Requires external EMI filtering for automotive use; no die temperature monitor or AVP support. | Choose MP2960GQ-0000-Z only for cost-sensitive industrial applications where CISPR25 compliance and junction monitoring are not required. |
Compared with LTC3310S#TRPBF and MP2960GQ-0000-Z, the LTC3311HV#TRPBF uniquely combines AEC-Q100 Grade H qualification, CISPR25 Class 5 radiated emissions compliance, and 12.5A capability in a 3mm×3mm footprint-enabling single-chip, high-reliability POL in space-constrained automotive and telecom designs.
Availability
LTC3311HV#TRPBF is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, 5G radio unit power delivery, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for LTC3311HV#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.
The LTC3311HV#TRPBF belongs to the Silent Switcher® monolithic DC/DC converter product line, engineered specifically for high-current, low-EMI point-of-load regulation in safety-critical and thermally constrained environments.
FAQ
What is the maximum output current supported by the LTC3311HV#TRPBF?
The LTC3311HV#TRPBF delivers up to 12.5A of continuous output current when properly heatsinked via its exposed PGND pad and operated within its specified input voltage (2.25V–5.5V) and temperature (–40°C to +150°C) ranges. Peak current mode control and 4.5mΩ NMOS RDS(ON) ensure stable regulation at full load without current limiting under typical conditions.
Does the LTC3311HV#TRPBF support remote voltage sensing?
Yes, the LTC3311HV#TRPBF supports true remote voltage sensing via dedicated AGND (Pin 2) and FB (Pin 18) pins. AGND must be connected directly to the load's ground reference point, enabling rejection of up to ±100mV ground potential difference between the IC and load - ensuring ±1% VOUT accuracy even with PCB trace resistance.
Is the LTC3311HV#TRPBF qualified for automotive applications?
Yes, the LTC3311HV#TRPBF is AEC-Q100 qualified for Grade H (–40°C to +150°C junction temperature) and designed for automotive under-hood applications. It includes built-in die temperature monitoring (via SSTT pin), robust protection features, and CISPR25 Class 5 radiated emissions compliance - all verified per automotive reliability standards.
How does the MODE/SYNC pin function on the LTC3311HV#TRPBF?
The MODE/SYNC pin on the LTC3311HV#TRPBF serves three roles: (1) accepts an external clock (0.5–2.25MHz) for synchronization, (2) outputs a synchronized clock signal when used in master configuration, and (3) selects operating mode (pulse-skipping or forced continuous) via DC voltage level. Internal 200kΩ pull-up enables default forced continuous mode when left open.
What thermal metrics define the LTC3311HV#TRPBF's cooling performance?
The LTC3311HV#TRPBF specifies θJCbottom = 9°C/W - meaning each watt of dissipated power raises the junction temperature by 9°C above the PCB ground plane temperature. This low value is achieved via its exposed PGND pad (Pin 19), which must be soldered to a large thermal copper area with multiple vias to maximize heat transfer and sustain 12.5A operation at +150°C junction.
LTC3311HV#TRPBF 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)
LTC3311HV#TRPBF FAQ
1.How can I place an order for LTC3311HV#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3311HV#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 LTC3311HV#TRPBF reliable?
The price and inventory of LTC3311HV#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3311HV#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3311HV#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3311HV#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3311HV#TRPBF?
LTC3311HV#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3311HV#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 LTC3311HV#TRPBF?
For technical support, including LTC3311HV#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3311HV#TRPBF requirements.
6.How does Aetrix verify that LTC3311HV#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3311HV#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 LTC3311HV#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3311HV#TRPBF?
All LTC3311HV#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3311HV#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 LTC3311HV#TRPBF part is unused and in its original packaging.
Return procedure for LTC3311HV#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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