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Analog Devices Inc. LTC3611IWP#TRPBF
- Part No.:
- LTC3611IWP#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3611IWP#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 10A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
LTC3611IWP#TRPBF 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#TRPBF datasheet, LTC3611IWP#TRPBF pinout, LTC3611IWP#TRPBF application, or LTC3611IWP#TRPBF equivalent, key selection criteria include minimum on-time (≤100 ns), forced/discontinuous mode control via FCB pin, PGOOD monitoring, adjustable switching frequency (>1 MHz), and 9mm × 9mm 64-pin QFN thermal performance.
Technical Context
The LTC3611IWP#TRPBF implements true valley current mode control using internal RDS(ON) sensing (15 mΩ top / 9 mΩ bottom MOSFETs), with ITH pin serving as both error amplifier output and current threshold input. Its constant on-time architecture enables fast transient response and stable operation with ceramic output capacitors.
Frequency is set externally via resistor on ION pin and adjusted by VON voltage (0.7V–2.4V clamped range); VRNG pin scales maximum valley current from 6A to 15A. Protection includes foldback current limiting, output overvoltage detection (±10% window), and undervoltage lockout (3.4V–4.0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10A max continuous; determined by VRNG-adjustable valley current limit (6–15A range) and thermal design in 9mm × 9mm QFN. |
| Input Voltage Range | 4.5V to 32V (36V absolute max); supports industrial 24V rails and wide-input battery systems. |
| Feedback Reference | 0.6V ±1% over –40°C to 125°C; enables precise output regulation down to 0.6V or higher via resistive divider. |
| Min On-Time | ≤100 ns; allows high-frequency operation (>1 MHz) and high step-down ratios (e.g., 24V→1.2V at 500 kHz). |
| Switching Frequency | Adjustable >1 MHz via external RON on ION pin; stabilized against VIN/VOUT variation by constant on-time architecture. |
| Power Good Threshold | ±10% output voltage window (ΔVFB = ±7% to ±13%); open-drain PGOOD asserts low when VOUT exits regulation. |
| Shutdown IQ | 15 µA typical; enables ultra-low-power system standby without external disconnect circuitry. |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed thermal pad (WP package). Thermal resistance θJA = 28°C/W (simulated JESD51-7 board), θJC = 1°C/W with heatsink.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pins 1,2,3,56–65) | Power Ground | High-current return path for SW node and PVIN decoupling; must connect directly to CIN(–) and CVCC(–) with low-inductance layout. |
| SW (Pins 4–11,26,55,66) | Switch Node | Drain connection of internal top MOSFET and source of bottom MOSFET; drives external inductor and bootstrap capacitor CB. |
| PVIN (Pins 12–25,67) | Main Input Supply | Distributed high-current VIN input; requires local 10µF+ ceramic CIN per group to minimize RMS current stress. |
| VFB (Pin 43) | Error Amplifier Input | Senses output voltage via resistive divider; referenced to SGND; sensitive to noise-must be routed away from SW and inductor. |
| ITH (Pin 38) | Current Threshold / Compensation | Setpoint for valley current comparator (0–2.4V range); also serves as EA output for Type II/III compensation network. |
| VRNG (Pin 37) | Current Limit Range | Adjusts max valley current from 6A to 15A via 0.7V–1.0V input; tied to GND for default 10A limit. |
| FCB (Pin 39) | Forced Continuous Mode | Logic-controlled mode selection: <0.54V = forced continuous (low-noise), >0.66V = discontinuous (high-efficiency at light load). |
| PGOOD (Pin 36) | Power Good Monitor | Open-drain output active-low when VOUT deviates >±10% from regulation; requires external pull-up for system sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| True Valley Current Mode Control | Uses internal MOSFET RDS(ON) for lossless current sensing-eliminates sense resistor, reduces BOM cost and board space. |
| Programmable Minimum On-Time | Configurable via VON pin (0.7V–2.4V clamp) and ION resistor-enables stable 1+ MHz operation even at 24V→1.2V conversion. |
| Adjustable Light-Load Operation | FCB pin selects between forced continuous (reduced EMI) and discontinuous (up to 95% efficiency at 10mA) modes. |
| Integrated Power Good Monitoring | PGOOD asserts low within 10 µs of VOUT excursion beyond ±10%; supports reliable power sequencing in multi-rail systems. |
| Robust Fault Protection | Foldback current limiting, output overvoltage shutdown, and UVLO (3.4V–4.0V hysteresis) prevent damage during startup, short-circuit, or brownout. |
Applications
| Industrial PLC I/O Modules | Telecom Base Station RF Power Supplies |
|---|---|
Use Scenario: Regulating 24V backplane to 3.3V/5V for FPGA, ADC, and digital I/O in harsh industrial environments. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 10A with fast transient response to handle burst-mode sensor data acquisition. Use Value: 100 ns min on-time enables stable 500 kHz operation at 24V→3.3V, reducing inductor size vs. legacy controllers while maintaining >92% efficiency at full load. | Use Scenario: Generating 12V bias for GaN RF power amplifiers from 48V telecom rectified bus with strict ripple and EMI requirements. IC Role / Device Role / Timing Role: High-current buck controller operating in forced continuous mode (FCB = INTVCC) to suppress switching noise near sensitive RF front-end. Use Value: Discontinuous mode disabled via FCB pin eliminates low-frequency beat frequencies; PGOOD ensures clean enable sequencing before PA activation. |
| Medical Imaging Power Subsystems | Automotive ADAS Domain Controllers |
Use Scenario: Providing 1.8V/3A and 1.2V/6A rails for high-speed image processors and analog front-ends in portable ultrasound units. IC Role / Device Role / Timing Role: Dual-output capable buck controller (with secondary winding + FCB) delivering tightly regulated, low-noise supplies with soft-start coordination. Use Value: Programmable soft-start via RUN/SS capacitor prevents inrush current into large ceramic output banks; ±1% reference ensures ADC accuracy across temperature. | Use Scenario: Converting 12V vehicle battery to 5V/10A for radar SoC and camera ISP in autonomous driving ECUs. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to 125°C) synchronous buck managing dynamic load steps up to 8A/µs during sensor fusion bursts. Use Value: 10A capability with 15 mΩ/9 mΩ MOSFETs minimizes conduction loss; tON(MIN) ≤100 ns maintains regulation during cold-crank (6.5V min VIN) at high output voltages. |
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 |
|---|---|---|---|
| MPQ4470AGL-Z | 6A max output, 4.5V–60V input, fixed 500kHz frequency, no VRNG/FCB pins, smaller 4mm × 5mm QFN. | Lacks programmable current limit and light-load mode control; suited for simpler, lower-current designs where footprint is critical. | Select MPQ4470AGL-Z only if 6A suffices and external frequency programming is unnecessary. |
| TPS54A20RJRT | 10A output, 4.5V–18V input, integrated 5V LDO for gate drive, no EXTVCC option, 3.5mm × 3.5mm QFN. | Narrower VIN range excludes 24V/32V industrial inputs; lacks PGOOD and adjustable min on-time-limits high-ratio designs. | Choose TPS54A20RJRT for compact 12V automotive systems requiring integrated LDO but not wide-VIN or precision sequencing. |
Compared with MPQ4470AGL-Z and TPS54A20RJRT, the LTC3611IWP#TRPBF uniquely supports 32V input, 100 ns min on-time, VRNG-adjustable current limit, and dual-mode light-load control-making it optimal for high-reliability, wide-input, high-step-down industrial and telecom power rails.
Availability
LTC3611IWP#TRPBF 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 and extended temperature support.
Supply support for LTC3611IWP#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3611IWP#TRPBF belongs to ADI's Power by Linear™ monolithic DC/DC converter family, engineered for high-current, wide-input, high-efficiency point-of-load regulation in demanding industrial, telecom, and medical applications.
FAQ
What is the operating temperature range for the LTC3611IWP#TRPBF?
The LTC3611IWP#TRPBF is rated for –40°C to 125°C junction temperature. As an "I" grade part, it is fully guaranteed over this full range-unlike the "E" grade-which makes LTC3611IWP#TRPBF suitable for under-hood automotive, industrial control, and outdoor telecom equipment where ambient temperatures exceed 85°C.
How do I configure the LTC3611IWP#TRPBF for forced continuous conduction mode?
To configure LTC3611IWP#TRPBF for forced continuous conduction mode, tie the FCB pin (Pin 39) to ground (≤0.54V). This disables discontinuous mode operation at light loads, ensuring consistent switching frequency and reduced EMI-critical for noise-sensitive RF or audio subsystems powered by LTC3611IWP#TRPBF.
Can the LTC3611IWP#TRPBF support output voltages below 0.6V?
No-the LTC3611IWP#TRPBF has a fixed 0.6V internal reference and requires VOUT ≥ 0.6V. The feedback equation VOUT = 0.6V × (1 + R2/R1) means the lowest achievable regulated output is 0.6V (when R2 = 0). For sub-0.6V outputs, a different controller with adjustable reference or external reference injection is required-not supported by LTC3611IWP#TRPBF.
What is the purpose of the VRNG pin on the LTC3611IWP#TRPBF?
On the LTC3611IWP#TRPBF, the VRNG pin (Pin 37) sets the maximum valley current limit by scaling the internal current comparator threshold. Applying 0.7V–1.0V adjusts IVALLEY(MAX) from 6A to 15A-enabling precise current limiting for different load profiles without changing external components. Leaving VRNG unconnected is prohibited; tie to GND for default 10A limit in LTC3611IWP#TRPBF.
Does the LTC3611IWP#TRPBF require an external bootstrap diode?
Yes-the LTC3611IWP#TRPBF requires an external Schottky bootstrap diode (DB) connected from INTVCC to BOOST (Pin 29) to recharge the bootstrap capacitor (CB) during each switching cycle. This diode must have low forward voltage (<0.4V) and fast recovery (<20 ns) to maintain gate drive integrity-omitting it will cause BOOT voltage collapse and top MOSFET failure in LTC3611IWP#TRPBF.
LTC3611IWP#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-PowerVFQFN
- 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3611IWP#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3611IWP#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 LTC3611IWP#TRPBF reliable?
The price and inventory of LTC3611IWP#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3611IWP#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3611IWP#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3611IWP#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3611IWP#TRPBF?
LTC3611IWP#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3611IWP#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 LTC3611IWP#TRPBF?
For technical support, including LTC3611IWP#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3611IWP#TRPBF requirements.
6.How does Aetrix verify that LTC3611IWP#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3611IWP#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 LTC3611IWP#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3611IWP#TRPBF?
All LTC3611IWP#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3611IWP#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 LTC3611IWP#TRPBF part is unused and in its original packaging.
Return procedure for LTC3611IWP#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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