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Analog Devices Inc. LTC3611EWP
- Part No.:
- LTC3611EWP
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3611EWP.pdf
- Description:
- IC REG BUCK ADJ 10A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,361
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Product details
Overview
LTC3611EWP from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC converter delivering up to 10A output current from 4.5V–32V input, featuring constant on-time valley current mode control, ±1% 0.6V reference, and power-good monitoring. It operates in forced continuous or discontinuous mode and targets point-of-load regulation in industrial and telecom power systems.
For engineers reviewing the LTC3611EWP datasheet, LTC3611EWP pinout, LTC3611EWP application, or LTC3611EWP equivalent, key selection criteria include its 9mm × 9mm 64-pin QFN package, programmable current limit via VRNG, adjustable switching frequency (>1 MHz), soft-start timing via RUN/SS capacitor, and internal N-channel MOSFETs eliminating external diode requirements.
Technical Context
The LTC3611EWP implements a constant on-time valley current mode architecture with true current sensing using bottom-FET RDS(ON), enabling fast transient response and stable operation with ceramic output capacitors. Its ITH pin serves dual roles: error amplifier compensation node and valley current threshold control, directly linking feedback loop dynamics to current limit programming.
Frequency is set by external resistor RON on ION pin and modulated by VON voltage, supporting constant-frequency operation across input/output variations. Overvoltage protection triggers M1 shutdown and M2 latching, while foldback current limiting reduces valley current to ~1.7A under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10A max - supports high-density point-of-load conversion without external power switches |
| Input Voltage Range | 4.5V to 32V (36V abs max) - compatible with 5V, 12V, 24V industrial rails and wide-range adapters |
| Feedback Reference | ±1% at 0.6V - enables precise output regulation down to sub-1V with minimal divider error |
| Min On-Time | ≤100ns - allows high step-down ratios (e.g., 24V→1.2V at >500kHz) without pulse-skipping |
| Shutdown IQ | 15μA - enables ultra-low-power standby in battery-backed or energy-sensitive systems |
| Package | 9mm × 9mm 64-pin QFN - provides low thermal resistance (θJA = 28°C/W) and high-current PGND/SW pin count |
| Power Good Threshold | ±10% on VFB - ensures reliable system sequencing and fault detection before downstream logic activation |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (WP grade). Features 12 PGND pins, 11 SW pins, 15 PVIN pins, and dedicated signal ground (SGND) network for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2,3,56–65) | Power Ground | High-current return path for MOSFETs and input/output capacitors; requires low-inductance connection to CIN/CVCC negative terminals |
| SW (4–11,26,55,66) | Switch Node | Drives inductor; connects bootstrap capacitor (–) terminal; swings from –0.3V to VIN |
| PVIN (12–25,67) | Main Input Supply | Distributes high-current VIN to internal MOSFETs; must be decoupled locally to PGND with ≥10µF low-ESR ceramic |
| ITH (38) | Error Amp Output / Current Limit Setpoint | 0–2.4V analog interface controlling valley current threshold; also used for loop compensation |
| VRNG (37) | Current Limit Range Input | 0.7V–1.0V input scaling maximum valley current from 6A to 15A; tied to GND for default 10A limit |
| PGOOD (36) | Open-Drain Status Output | Asserts low when VFB exits ±10% window; requires external pull-up for system enable/sequencing logic |
| RUN/SS (30) | Enable & Soft-Start Control | 0.8V shutdown threshold; 1.5V turn-on threshold; external capacitor sets ramp time (~3s/µF) |
Key Features
| Feature | Design Value |
|---|---|
| True valley current mode control | Enables direct current sensing without sense resistors, reducing losses and board area vs. external shunt solutions |
| Programmable minimum on-time (≤100ns) | Supports high-frequency, high-ratio buck conversion (e.g., 48V→3.3V @ 1MHz) without instability or duty-cycle limitation |
| Stable with ceramic COUT | Eliminates need for high-ESR electrolytics, enabling compact, long-life output filtering in space-constrained designs |
| Adjustable forced continuous/discontinuous mode | FCB pin selects light-load behavior: continuous mode lowers EMI; discontinuous mode improves efficiency below ~1A |
| Integrated 5V INTVCC regulator + EXTVCC switchover | Reduces external bias supply count; EXTVCC >4.7V disables internal LDO, improving efficiency when secondary 5V rail is available |
Applications
| Industrial PLC I/O Modules | Telecom Base Station RF Power Supplies |
|---|---|
Use Scenario: Providing isolated 3.3V/5V rails for FPGA configuration, ADC/DAC interfaces, and digital isolators in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24V backplane to low-voltage logic supplies with tight load-transient response. Use Value: 10A capability supports multi-rail FPGA power domains; ±1% reference ensures accurate ADC reference voltage generation. | Use Scenario: Generating 12V bias for GaN RF power amplifiers in 4G/5G macro base stations requiring high reliability and thermal resilience. IC Role / Device Role / Timing Role: High-current intermediate bus converter stepping down 48V telecom rectified input to amplifier stage supply. Use Value: 32V max input accommodates 48V nominal with surge margin; 9mm QFN package enables dense layout near heat-generating PA stages. |
| Medical Imaging Power Subsystems | Automotive ADAS Domain Controllers |
Use Scenario: Delivering clean, low-noise 1.8V/2.5V supplies to high-speed data converters and clock ICs in MRI and CT scanner front-end modules. IC Role / Device Role / Timing Role: Low-noise synchronous buck regulator with programmable FCB mode to suppress switching artifacts during sensitive acquisition windows. Use Value: Discontinuous mode at light load reduces conducted EMI; <100ns min on-time maintains regulation during rapid load steps from detector readout bursts. | Use Scenario: Powering vision processor SoCs (e.g., NVIDIA Orin) in autonomous driving ECUs requiring robust 12V→1.0V conversion under automotive temperature and vibration stress. IC Role / Device Role / Timing Role: High-reliability buck controller with integrated MOSFETs, overvoltage latch, and -40°C to 125°C operation. Use Value: Foldback current limiting protects against shorted SoC VDDQ rails; PGOOD output coordinates safe boot sequence with vehicle CAN network. |
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 |
|---|---|---|---|
| MP8772GQ-Z | 6A max output, 4.5V–18V input, fixed 500kHz frequency, no VRNG/ITH programmability | Suitable for lower-current, cost-sensitive consumer applications; lacks valley current mode and precision current limit tuning | Select when design requires simpler configuration, smaller footprint (4mm × 4mm QFN), and does not need >6A or adjustable current limit |
| TPS546D24RSAR | 10A output, 4.5V–18V input, PMBus interface, digital loop compensation, 3.5mm × 4.5mm QFN | Targeted at systems requiring telemetry, dynamic voltage scaling, and remote fault logging via I²C | Select when digital control, real-time telemetry, or adaptive loop tuning is required-LTC3611EWP offers analog simplicity and higher input voltage range |
Compared with MP8772GQ-Z and TPS546D24RSAR, the LTC3611EWP uniquely combines 32V input tolerance, analog-programmable current limit (via VRNG), and true valley current mode for highest transient performance in industrial and telecom environments where input surges and rapid load steps are common.
Availability
LTC3611EWP is available at Aetrix Electronics and suitable for industrial PLCs, telecom base station power supplies, medical imaging subsystems, and automotive ADAS domain controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3611EWP 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3611EWP belongs to ADI's Power by Linear™ monolithic DC/DC converter family, engineered for high-efficiency, high-current point-of-load regulation in harsh environments with wide input ranges and robust fault protection.
FAQ
What is the absolute maximum input voltage rating for the LTC3611EWP?
The LTC3611EWP has an absolute maximum input voltage of 36V on VIN and PVIN pins. Operation above 32V is not recommended for sustained use, as the device is specified for 4.5V–32V continuous operation. Exceeding 36V risks permanent damage per Absolute Maximum Ratings.
How does the VRNG pin affect current limiting in the LTC3611EWP?
The VRNG pin on the LTC3611EWP sets the maximum valley current limit between 6A and 15A via a 0.7V–1.0V input. At 0.7V (default when grounded), LTC3611EWP delivers up to 10A typical. Increasing VRNG voltage linearly raises the current limit, enabling precise adaptation to different inductor and MOSFET selections without changing external components.
Can the LTC3611EWP operate with only ceramic output capacitors?
Yes, the LTC3611EWP is explicitly designed to be stable with ceramic output capacitors due to its valley current mode architecture and internal compensation. No ESR requirement exists-unlike voltage-mode controllers-making it ideal for low-profile, long-life designs where polymer or tantalum capacitors would otherwise be needed.
What is the purpose of the FCB pin on the LTC3611EWP?
On the LTC3611EWP, the FCB (Forced Continuous Bias) pin selects light-load operating mode: grounding FCB forces continuous conduction mode (reducing EMI), tying FCB to INTVCC enables discontinuous mode (improving light-load efficiency), and connecting to a resistive divider from a secondary output supports multi-output configurations.
Does the LTC3611EWP include overvoltage protection, and how does it behave?
Yes, the LTC3611EWP includes output overvoltage protection. When VFB exceeds ±10% of 0.6V (i.e., >0.66V), the PGOOD pin pulls low and the top MOSFET (M1) shuts off while the bottom MOSFET (M2) remains latched on until VFB returns to regulation-preventing damage to downstream loads during feedback loop faults.
LTC3611EWP 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)
LTC3611EWP FAQ
1.How can I place an order for LTC3611EWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3611EWP 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 LTC3611EWP reliable?
The price and inventory of LTC3611EWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3611EWP is usually 5 days.
3.What payment methods are accepted for LTC3611EWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3611EWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3611EWP?
LTC3611EWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3611EWP 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 LTC3611EWP?
For technical support, including LTC3611EWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3611EWP requirements.
6.How does Aetrix verify that LTC3611EWP is sourced from the original manufacturer or authorized distributors?
All LTC3611EWP 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 LTC3611EWP meets industry standards.
7.What is the process for return or replacement of LTC3611EWP?
All LTC3611EWP units undergo pre-shipment inspection (PSI). If there is an issue with LTC3611EWP, 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 LTC3611EWP part is unused and in its original packaging.
Return procedure for LTC3611EWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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