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Analog Devices Inc. LTC3611IWP
- Part No.:
- LTC3611IWP
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3611IWP.pdf
- Description:
- IC REG BUCK ADJ 10A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,254
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Product details
Overview
LTC3611IWP from Analog Devices (formerly Linear Technology) is a 10A, 4.5V–32V input monolithic synchronous step-down DC/DC converter with constant on-time valley current mode control, ±1% 0.6V reference, and programmable current limit. It delivers high efficiency at high step-down ratios in point-of-load and distributed power systems.
For engineers reviewing the LTC3611IWP datasheet, LTC3611IWP pinout, LTC3611IWP application, or LTC3611IWP equivalent, key selection criteria include minimum on-time (≤100 ns), forced/discontinuous mode configurability, 9mm × 9mm 64-pin QFN package thermal performance, and true current-mode stability with ceramic output capacitors.
Technical Context
The LTC3611IWP implements a constant on-time valley current mode architecture where switching frequency is implicitly set by ION resistor and VON voltage, enabling stable operation across wide VIN/VOUT ranges without external compensation. Its valley current sensing uses internal MOSFET RDS(ON), eliminating sense resistors.
Fault protection includes foldback current limiting (reducing valley current to ~1.7A under short-circuit), output overvoltage detection (±10% window), and latch-off shutdown timer via RUN/SS. Power good (PGOOD) asserts open-drain low when VFB deviates >±10% from 0.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10A max continuous - supports high-density POL regulation for FPGAs, ASICs, and processors. |
| Input Voltage Range | 4.5V to 32V (36V abs max) - compatible with 5V, 12V, 24V industrial and telecom rails. |
| Feedback Reference | ±1% 0.6V - enables precise output voltage setting (e.g., 1.2V ±12mV) with standard resistor dividers. |
| Min On-Time | ≤100ns - allows high step-down ratios (e.g., 24V→1.2V at 500kHz) without dropout. |
| Switching Frequency | Adjustable >1MHz via ION resistor - balances size (small inductor/capacitor) vs. efficiency. |
| Shutdown IQ | 15μA - enables ultra-low-power standby in battery-backed or always-on systems. |
| Package | 9mm × 9mm 64-pin QFN - provides low θJA (28°C/W) and high-current PGND/SVIN routing capability. |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (WP). Requires solder paste stencil design per JEDEC MO-220, thermal pad connected to PGND for optimal heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,3,56–65) | Power Ground Return | Low-impedance path for high di/dt switch currents; must connect directly to CIN(–) and CVCC(–) with multiple vias. |
| SW (Pins 4–11,26,55,66) | Switch Node | Connects to inductor and bootstrap capacitor (–); swings from –0.3V to VIN; critical for EMI layout. |
| PVIN (Pins 12–25,67) | Main Input Supply | Distributes high-current VIN to internal drivers; requires local 10µF+ low-ESR ceramic decoupling per group. |
| VFB (Pin 43) | Error Amplifier Input | Senses output via resistor divider; trace must be short, shielded from SW/inductor noise to avoid instability. |
| ITH (Pin 38) | Current Threshold Control | Directly sets valley current limit (0–2.4V range); also serves as EA compensation node. |
| VRNG (Pin 37) | Current Limit Range | Adjusts max valley current from 6A to 15A via 0.7–1.0V input; default 0.7V = 10A typical. |
| PGOOD (Pin 36) | Power Good Monitor | Open-drain output active low when VFB outside ±10%; used for supply sequencing and fault reporting. |
| RUN/SS (Pin 30) | Enable & Soft-Start | Pull <0.8V to shut down; external capacitor sets soft-start ramp time (~3s/µF) and OCP delay. |
Key Features
| Feature | Design Value |
|---|---|
| True Valley Current Mode Control | Enables stable operation with ceramic output capacitors and eliminates need for external current-sense resistor. |
| Programmable Minimum On-Time (≤100ns) | Supports high-frequency, high-ratio conversion (e.g., 24V→1.0V @ 1MHz) without pulse-skipping or instability. |
| Forced Continuous / Discontinuous Mode Select | FCB pin configures light-load behavior: continuous mode reduces EMI; discontinuous improves light-load efficiency. |
| Integrated 5V INTVCC Regulator + EXTVCC Switchover | Reduces system power loss by allowing external 5V rail (e.g., secondary output) to power gate drivers and logic. |
| Robust Fault Protection Suite | Includes foldback current limiting, output overvoltage lockout, UVLO (3.4V–4.0V), and latch-off shutdown timer. |
| Stable with Ceramic Output Capacitors | Eliminates reliance on high-ESR electrolytics; enables compact, low-profile designs with superior transient response. |
Applications
| Telecom Point-of-Load | Industrial FPGA Core Supply |
|---|---|
|
Use Scenario: Regulating 12V or 48V intermediate bus to 1.2V/10A for high-end FPGA core logic. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering tightly regulated, low-noise core voltage with fast load-step response. Use Value: 100ns min on-time enables 1.2V output from 48V input at 500kHz; PGOOD ensures safe FPGA configuration sequencing. |
Use Scenario: Providing 3.3V/10A to FPGA I/O banks and transceivers in harsh industrial environments. IC Role / Device Role / Timing Role: High-current, wide-input buck regulator with robust thermal management and overvoltage protection. Use Value: 9mm × 9mm QFN package supports high-power density; ±1% reference ensures signal integrity across temperature. |
| Automotive ADAS Domain Controller | Medical Imaging Power Subsystem |
|
Use Scenario: Converting 12V vehicle battery to 1.8V/10A for radar processor SoCs operating at –40°C to 125°C. IC Role / Device Role / Timing Role: AEC-Q100 stress-tested (I-grade) buck converter with guaranteed operation across full junction temp range. Use Value: Internal foldback current limit prevents thermal runaway during short-circuit faults; low shutdown IQ extends battery life. |
Use Scenario: Generating stable 5V/10A for high-speed ADC/DAC subsystems in portable ultrasound equipment. IC Role / Device Role / Timing Role: Low-noise, low-ripple POL regulator with programmable soft-start to prevent inrush-induced system resets. Use Value: Discontinuous mode option minimizes standby power; PGOOD synchronizes data acquisition timing with power rail stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8633BGLE-Z | 6A rated, 4.5–16V input, integrated MOSFETs, fixed 500kHz frequency; no VRNG/ITH pins for current limit tuning. | Lower current capacity; suitable for cost-sensitive mid-power apps but lacks LTC3611IWP's 10A headroom and flexible light-load modes. | Select MPQ8633BGLE-Z only if 6A suffices and board space constraints favor smaller 5mm × 6mm QFN. |
| TPS546D24RSAR | 10A, 4–18V input, PMBus interface, digital loop compensation; requires external EEPROM for configuration. | Offers telemetry and dynamic margining but adds firmware complexity; less suited for analog-only, fast-turn designs. | Choose TPS546D24RSAR when digital monitoring, remote reconfiguration, or multi-rail coordination are required. |
Compared with MPQ8633BGLE-Z and TPS546D24RSAR, the LTC3611IWP provides unmatched analog flexibility for high-ratio, high-current DC/DC with minimal external components-ideal for analog-centric, thermally demanding, or rapidly prototyped systems.
Availability
LTC3611IWP is available at Aetrix Electronics and suitable for telecom infrastructure, industrial FPGA power, and automotive ADAS applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3611IWP 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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear power products, including rigorous qualification and long-term reliability testing.
The LTC3611IWP belongs to Linear's high-current monolithic buck converter family, designed specifically for high-efficiency, high-density point-of-load regulation in space-constrained, thermally aggressive environments.
FAQ
What is the maximum input voltage rating for the LTC3611IWP?
The LTC3611IWP has an absolute maximum input voltage of 36V, with recommended operating range from 4.5V to 32V. Exceeding 36V risks permanent damage per Absolute Maximum Ratings. The device includes undervoltage lockout (UVLO) that disables operation below 3.4V (falling) and re-enables above 3.5V (rising), ensuring clean startup.
How does the VRNG pin affect current limiting in the LTC3611IWP?
The VRNG pin on the LTC3611IWP adjusts the maximum valley current limit from 6A to 15A by accepting a 0.7V–1.0V input voltage. At 0.7V (default when tied to ground), the LTC3611IWP delivers 10A typical output current. Increasing VRNG to 1.0V raises the limit to 15A, enabling higher peak loads while maintaining thermal safety margins.
Can the LTC3611IWP operate with ceramic output capacitors?
Yes, the LTC3611IWP is explicitly designed to be stable with low-ESR ceramic output capacitors due to its valley current mode architecture and internal compensation. This eliminates the need for high-ESR electrolytic or tantalum capacitors, reducing board area, improving transient response, and enhancing reliability in high-vibration environments.
What is the purpose of the FCB pin on the LTC3611IWP?
The FCB (Forced Continuous Bias) pin on the LTC3611IWP selects light-load operation mode: grounding FCB forces continuous conduction (lower EMI), tying it to INTVCC enables discontinuous mode (higher light-load efficiency), and connecting it to a resistive divider from a secondary output supports multi-output configurations. This pin directly controls MOSFET switching behavior below ~20% load.
Does the LTC3611IWP support power supply sequencing?
Yes, the LTC3611IWP supports precise power supply sequencing via its RUN/SS pin and PGOOD output. An external capacitor on RUN/SS sets soft-start ramp time (~3s/µF), while PGOOD provides an open-drain signal indicating when VOUT is within ±10% of regulation-enabling safe, controlled turn-on of downstream ICs like FPGAs or processors in the LTC3611IWP-based power tree.
LTC3611IWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-PowerVFQFN
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 32V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 32V
- Current - Output:
- 10A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (9x9)
LTC3611IWP FAQ
1.How can I place an order for LTC3611IWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3611IWP 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 LTC3611IWP reliable?
The price and inventory of LTC3611IWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3611IWP is usually 5 days.
3.What payment methods are accepted for LTC3611IWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3611IWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3611IWP?
LTC3611IWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3611IWP 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 LTC3611IWP?
For technical support, including LTC3611IWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3611IWP requirements.
6.How does Aetrix verify that LTC3611IWP is sourced from the original manufacturer or authorized distributors?
All LTC3611IWP 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 LTC3611IWP meets industry standards.
7.What is the process for return or replacement of LTC3611IWP?
All LTC3611IWP units undergo pre-shipment inspection (PSI). If there is an issue with LTC3611IWP, 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 LTC3611IWP part is unused and in its original packaging.
Return procedure for LTC3611IWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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