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Analog Devices Inc. LTC3611IWP#PBF
- Part No.:
- LTC3611IWP#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3611IWP#PBF.pdf
- Description:
- IC REG BUCK ADJ 10A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:662
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Product details
Overview
LTC3611IWP#PBF 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 9mm × 9mm 64-pin QFN package. It delivers high efficiency in point-of-load and distributed power systems for industrial and telecom infrastructure.
For engineers reviewing the LTC3611IWP#PBF datasheet, LTC3611IWP#PBF pinout, LTC3611IWP#PBF application, or LTC3611IWP#PBF equivalent, key selection criteria include programmable current limit (via VRNG), adjustable switching frequency (>1 MHz via ION resistor), forced continuous/discontinuous mode control (FCB), soft-start timing (RUN/SS capacitor), and output overvoltage protection with PGOOD monitoring.
Technical Context
The LTC3611IWP#PBF implements a constant on-time valley current mode architecture with internal N-channel MOSFETs (15 mΩ top / 9 mΩ bottom), enabling stable operation with ceramic output capacitors and fast transient response. Its tON(MIN) ≤ 100 ns supports high step-down ratios and low-duty-cycle operation at high frequencies.
Fault protection includes foldback current limiting, output overvoltage detection (±10% window), and optional short-circuit shutdown timer. Power sequencing is enabled via RUN/SS pin with 1.2 µA soft-start charge current, while EXTVCC switchover (4.7 V threshold) allows external 5 V supply to power INTVCC and gate drivers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10 A maximum continuous output current; supports high-power PoL regulation without external MOSFETs. |
| Input Voltage Range | 4.5 V to 32 V (36 V absolute max); suitable for 5 V, 12 V, 24 V, and 28 V industrial bus rails. |
| Feedback Reference | ±1% 0.6 V internal reference; enables precise output voltage setting (e.g., 1.2 V, 2.5 V, 3.3 V) with standard resistor dividers. |
| Switching Frequency | Adjustable >1 MHz via external ION resistor; maintains stable frequency across VIN/VOUT variations using constant on-time control. |
| Min On-Time | ≤100 ns; enables high step-down conversion (e.g., 24 V → 1.2 V at ~500 kHz) without dropout. |
| Shutdown IQ | 15 µA typical; ensures ultra-low quiescent power during system standby or sleep modes. |
| Package | 64-pin 9 mm × 9 mm QFN with exposed thermal pad; optimized for high-power density and thermal performance in compact layouts. |
Pinout & Package
Package: 64-lead (9 mm × 9 mm) plastic QFN with exposed PGND thermal pad. Designed for high-current routing and thermal dissipation in multilayer PCBs with dedicated power ground planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,3,56–65) | Power Ground Return | Low-impedance return path for high di/dt switch node current; must be connected directly to CIN(–) and CVCC(–) with minimal trace inductance. |
| SW (Pins 4–11,26,55,66) | Switch Node | Drain connection of internal top MOSFET and source of bottom MOSFET; connects to inductor and bootstrap capacitor (–) terminal. |
| PVIN (Pins 12–25,67) | Main Input Supply | Distributed high-current VIN input; multiple pins reduce IR drop and improve thermal spreading for 10 A operation. |
| INTVCC (Pins 53,54) | Internal 5 V Regulator Output | Supplies gate drivers and control logic; requires ≥4.7 µF low-ESR ceramic/tantalum decoupling to PGND. |
| VFB (Pin 43) | Error Amplifier Input | Connects to resistive divider from VOUT; senses regulated output voltage against 0.6 V reference for closed-loop control. |
| ITH (Pin 38) | Current Threshold Control | Sets valley current limit via voltage (0–2.4 V); also serves as compensation node for loop stability. |
| VRNG (Pin 37) | Current Limit Range | Adjusts max valley current from ~6 A to 15 A via 0.7–1.0 V input; default 0.7 V yields 10 A typical limit. |
| PGOOD (Pin 36) | Open-Drain Status Output | Asserts low when VOUT deviates >±10% from regulation; used for power sequencing and fault reporting. |
| RUN/SS (Pin 30) | Enable & Soft-Start Control | Pull <0.8 V to shut down; external capacitor sets ramp time (~3 s/µF) and overcurrent latchoff delay. |
| ION (Pin 41) | On-Time Current Input | Resistor from VIN sets one-shot timer current; determines switching frequency and compensates for VIN variation. |
Key Features
| Feature | Design Value |
|---|---|
| True Valley Current Mode Control | Direct sensing of inductor valley current via bottom MOSFET RDS(ON) eliminates need for external sense resistor and improves light-load accuracy. |
| Programmable Current Limit | VRNG pin adjusts max valley current from 6 A to 15 A using simple resistive divider from INTVCC - no external components required for scaling. |
| Stable with Ceramic COUT | No ESR requirement for output capacitor; enables use of low-profile, high-reliability ceramic arrays instead of electrolytics or polymer caps. |
| Adjustable On-Time Architecture | VON pin allows dynamic adjustment of tON to maintain constant frequency during VOUT transients or load changes - critical for noise-sensitive applications. |
| EXTVCC Switchover | Automatic transition to external 5 V supply when EXTVCC > 4.7 V reduces power loss and improves efficiency in multi-rail systems. |
Applications
| Industrial PLC I/O Modules | Telecom Base Station RF Power Supplies |
|---|---|
Use Scenario: Providing isolated 3.3 V/5 V bias rails for analog front-end ADCs, DACs, and digital isolators in modular I/O cards operating from 24 V DC field bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering 10 A peak current with fast transient response to handle burst-mode sensor sampling and communication bursts. Use Value: Eliminates need for external current-sense resistors and Schottky diodes; ±1% reference ensures accurate ADC reference voltage generation under varying load conditions. | Use Scenario: Generating 1.2 V core voltage for FPGAs and ASICs in macrocell baseband units, where tight regulation and low noise are mandatory. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with programmable soft-start and PGOOD signaling for safe FPGA configuration sequencing. Use Value: 100 ns minimum on-time enables stable 24 V → 1.2 V conversion at 600 kHz; forced continuous mode (FCB = INTVCC) suppresses audible noise during low-load idle periods. |
| Medical Imaging Power Subsystems | Automotive ADAS Domain Controllers |
Use Scenario: Supplying 2.5 V/3.3 V rails to high-speed data acquisition modules in portable ultrasound and MRI subsystems with strict EMI limits. IC Role / Device Role / Timing Role: Synchronous buck controller with discontinuous mode capability to maximize efficiency at standby power levels (<100 mA). Use Value: Discontinuous mode reduces switching losses below 1 A load; ceramic-capacitor compatibility avoids electrolytic aging and leakage issues in long-life medical equipment. | Use Scenario: Delivering 1.8 V/2.5 V processor core and I/O supplies in automotive radar and camera ECUs operating across –40°C to 125°C ambient. IC Role / Device Role / Timing Role: Automotive-grade buck converter with guaranteed –40°C to 125°C operation, output overvoltage protection, and robust thermal management. Use Value: Internal MOSFETs rated for 36 V abs max withstand load-dump transients; 9 mm × 9 mm QFN package supports automated optical inspection and reflow profiling per AEC-Q200 guidelines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3612IWP#PBF | Same 64-pin QFN package and pinout; adds dual-phase interleaving support and higher 12 A output capability. | Required for >10 A loads or lower output ripple; not drop-in compatible due to different phase-control logic and ITH behavior. | Select LTC3612IWP#PBF only when interleaved operation or >10 A sustained current is needed; otherwise LTC3611IWP#PBF offers simpler layout and lower BOM cost. |
| MP2918GL-Z | Monolithic 10 A buck with 4.5–36 V input, but uses voltage mode control, lacks VRNG-adjustable current limit, and has fixed 500 kHz–2.2 MHz frequency range. | Suitable for cost-sensitive industrial applications where valley current mode and programmable current limit are not required. | Choose MP2918GL-Z for simplified design with fewer external components; avoid if fast transient response or precise current limiting is critical. |
Compared with LTC3612IWP#PBF, the LTC3611IWP#PBF provides identical thermal and package compatibility but trades dual-phase capability for simpler single-phase control and lower gate drive complexity. Against MP2918GL-Z, it delivers superior transient performance and flexible current limiting at the cost of slightly higher external component count.
Availability
LTC3611IWP#PBF is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and medical imaging systems requiring stable component supply, extended temperature operation (–40°C to 125°C), and high reliability in high-current DC/DC conversion.
Supply support for LTC3611IWP#PBF 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 product continuity, technical documentation, and long-term supply commitment for all Linear-branded power ICs.
The LTC3611IWP#PBF belongs to Linear's high-current monolithic buck regulator family, designed specifically for demanding point-of-load applications in industrial, telecom, and medical systems where efficiency, thermal performance, and design simplicity are critical.
FAQ
What is the maximum output current capability of the LTC3611IWP#PBF?
The LTC3611IWP#PBF delivers up to 10 A continuous output current under proper thermal conditions (TJ ≤ 125°C). This rating assumes adequate PCB copper area, airflow, and use of the exposed PGND thermal pad. The actual achievable current depends on input voltage, output voltage, ambient temperature, and layout - e.g., at VIN = 12 V, VOUT = 1.2 V, and TA = 70°C, LTC3611IWP#PBF typically sustains 10 A with 2 oz copper and 200 LFM airflow.
How does the VRNG pin adjust current limit in the LTC3611IWP#PBF?
The VRNG pin on the LTC3611IWP#PBF accepts a voltage from 0.7 V to 1.0 V to scale the maximum valley current limit linearly from ~6 A to 15 A. Tying VRNG to ground defaults to 0.7 V (10 A typical), while a resistive divider from INTVCC (5 V) sets intermediate values. The LTC3611IWP#PBF datasheet Figure "Maximum Valley Current Limit vs VRNG Voltage" confirms this monotonic relationship across temperature.
Can the LTC3611IWP#PBF operate with ceramic output capacitors only?
Yes, the LTC3611IWP#PBF is explicitly designed to be stable with ceramic output capacitors - no ESR requirement. Its valley current mode control and internal compensation eliminate the need for bulk capacitance with defined ESR. Typical designs use 10–100 µF X5R/X7R ceramics in parallel; the LTC3611IWP#PBF evaluation board (DC1622A) validates stability with 4 × 47 µF 0805 ceramics.
What is the purpose of the FCB pin on the LTC3611IWP#PBF?
The FCB (Forced Continuous Bias) pin on the LTC3611IWP#PBF selects light-load operating mode: grounding FCB forces continuous conduction (reducing EMI), tying to INTVCC enables discontinuous mode (improving light-load efficiency), and connecting to a secondary output enables auto-synchronous operation in multi-output designs. The LTC3611IWP#PBF datasheet specifies FCB thresholds of 0.54 V (enable continuous) and 0.66 V (enable discontinuous).
Does the LTC3611IWP#PBF support power sequencing via the RUN/SS pin?
Yes, the RUN/SS pin on the LTC3611IWP#PBF provides both enable control and programmable soft-start. Pulling RUN/SS below 0.8 V shuts down the LTC3611IWP#PBF; releasing it initiates a controlled ramp via an external capacitor (≈3 s/µF to full output). The same pin also sets overcurrent latchoff delay - critical for coordinated sequencing in multi-rail systems like FPGA or DSP power domains.
LTC3611IWP#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-PowerVFQFN
- Packaging:
- Tube
- Product Status:
- Active
- 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#PBF FAQ
1.How can I place an order for LTC3611IWP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3611IWP#PBF 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#PBF reliable?
The price and inventory of LTC3611IWP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3611IWP#PBF is usually 5 days.
3.What payment methods are accepted for LTC3611IWP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3611IWP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3611IWP#PBF?
LTC3611IWP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3611IWP#PBF 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#PBF?
For technical support, including LTC3611IWP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3611IWP#PBF requirements.
6.How does Aetrix verify that LTC3611IWP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3611IWP#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3611IWP#PBF?
All LTC3611IWP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3611IWP#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3611IWP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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