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Analog Devices Inc. LTC3611EWP#TRPBF
- Part No.:
- LTC3611EWP#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 64-PowerVFQFN
- Datasheet:
-
LTC3611EWP#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 10A 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,450
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Product details
Overview
LTC3611EWP#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 9mm × 9mm 64-pin QFN package. It delivers high efficiency at high step-down ratios in point-of-load and distributed power systems.
For engineers reviewing the LTC3611EWP#TRPBF datasheet, LTC3611EWP#TRPBF pinout, LTC3611EWP#TRPBF application, or LTC3611EWP#TRPBF equivalent, key selection criteria include programmable current limit via VRNG, adjustable switching frequency (>1 MHz) via ION resistor, forced continuous/discontinuous mode selection via FCB, soft-start timing via RUN/SS capacitor, and output overvoltage protection with PGOOD monitoring.
Technical Context
The LTC3611EWP#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 control point. Its constant on-time architecture enables sub-100 ns minimum on-time (tON(MIN) ≤ 100 ns) and fast transient response without external compensation.
Frequency is set by external resistor on ION pin and modulated by VON voltage; operation supports discontinuous conduction mode (DCM) for light-load efficiency or forced continuous conduction mode (FCCM) for low-noise performance. Fault protection includes foldback current limiting, output overvoltage detection (±10% window), and optional short-circuit shutdown timer.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 10 A maximum continuous output current with thermal derating per θJA = 28°C/W. |
| Input Voltage Range | 4.5 V to 32 V (36 V absolute max); UVLO release at 3.5–4.0 V ensures clean startup. |
| Feedback Reference | 0.6 V ±1% over –40°C to 125°C; enables precise output regulation with standard resistor dividers. |
| Switching Frequency | Adjustable >1 MHz via ION resistor; stabilized against VIN/VOUT variation by constant on-time architecture. |
| Min On-Time | ≤100 ns (typical), enabling high step-down ratios (e.g., 24 V → 1.2 V at ~500 kHz). |
| Power Good Threshold | PGOOD asserts when VFB is within ±10% of 0.6 V (i.e., 0.54–0.66 V), with 1% hysteresis. |
| Shutdown IQ | 15 µA typical; enables ultra-low power-off state for battery-backed or always-on systems. |
Pinout & Package
Package: 64-pin (9 mm × 9 mm) plastic QFN with exposed thermal pad (WP package). PGND pins (1, 2, 3, 56–65) and PVIN pins (12–25, 67) are multiplexed for low-impedance power delivery; SGND pins (28, 31–34, 40, 42, 45–50, 68) provide dedicated signal ground return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (1,2,3,56–65) | Power Ground | Low-inductance return path for high-current switch node and input capacitors; must connect directly to CIN(–) and CVCC(–). |
| SW (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 (12–25,67) | Main Input Supply | High-current VIN input; requires local ceramic decoupling (≥10 µF) to PGND for EMI suppression and RMS current handling. |
| VFB (43) | Error Amplifier Input | Senses output voltage via resistive divider; 0.6 V reference sets regulation point; ±50 nA input bias minimizes divider error. |
| ITH (38) | Current Threshold / Compensation | Combines error amplifier output and current comparator threshold; 0–2.4 V range controls valley current limit and loop stability. |
| VRNG (37) | Valley Current Range | 0.7–1.0 V input adjusts maximum valley current from 6 A to 15 A; default 0.7 V yields 10 A typical limit. |
| PGOOD (36) | Open-Drain Status Output | Active-low signal indicating VFB within ±10% of 0.6 V; requires external pull-up for logic-level interfacing. |
| RUN/SS (30) | Enable & Soft-Start Control | 0.8 V shutdown threshold; 1.5 V turn-on threshold; external capacitor sets soft-start ramp time (~3 s/µF). |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous MOSFETs | Eliminates external Schottky diode; 15 mΩ/9 mΩ RDS(ON) reduces conduction loss and improves full-load efficiency. |
| True Valley Current Mode Control | Enables stable operation with ceramic output capacitors and eliminates need for external current-sense resistor. |
| Programmable Minimum On-Time | tON(MIN) ≤ 100 ns allows high-frequency, high-step-down designs (e.g., 24 V → 1.8 V @ 1 MHz). |
| Adjustable Light-Load Operation | FCB pin selects forced continuous (low noise) or discontinuous (high efficiency) mode-no external circuitry required. |
| Integrated Overvoltage Protection | Hardware-based OV comparator pulls PGOOD low and shuts off top MOSFET if VFB exceeds 0.66 V, preventing damage to downstream loads. |
| External VCC Support (EXTVCC) | Accepts 4.7–7 V external supply to power INTVCC, reducing power loss and improving efficiency in multi-rail systems. |
Applications
| Telecom Point-of-Load | Industrial FPGA Core Supply |
|---|---|
Use Scenario: Powering ASIC/FPGA core rails (e.g., 1.2 V/8 A) from 12 V or 24 V intermediate bus in telecom line cards. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise core voltage with fast load-transient response. Use Value: 10 A capability and <100 ns min on-time enable single-chip solution for high-current, high-step-down FPGA cores without paralleling. | Use Scenario: Providing 3.3 V/6 A auxiliary rail for I/O banks and transceivers in industrial PLC controllers with wide input voltage range. IC Role / Device Role / Timing Role: High-efficiency, robust DC/DC converter supporting 4.5–32 V input with integrated OVP/UVP and PGOOD sequencing. Use Value: Built-in fault protection and ±1% reference ensure reliable operation across harsh industrial temperature and voltage transients. |
| Automotive ADAS Camera Module | Medical Imaging Sensor Bias |
Use Scenario: Generating 2.5 V/5 A supply for image sensor and ISP in automotive surround-view camera modules with 9–16 V battery input. IC Role / Device Role / Timing Role: Automotive-grade (–40°C to 125°C) synchronous buck converter with programmable soft-start and current limit for inrush control. Use Value: Adjustable VRNG and RUN/SS capacitor allow precise inrush current limiting during cold-crank (6 V) and hot-idle (16 V) conditions. | Use Scenario: Delivering low-noise 5 V/3 A bias for CMOS image sensors in portable ultrasound devices powered from Li-ion battery (3.0–4.2 V) + boost stage. IC Role / Device Role / Timing Role: High PSRR, low-RMS-noise buck regulator operating in forced continuous mode (FCB = INTVCC) to suppress switching artifacts in analog signal chain. Use Value: FCCM operation eliminates low-frequency DCM ripple; EXTVCC support enables efficient use of secondary winding voltage for gate drive. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4470AGL-Z | 6 A max output, 4.5–36 V input, fixed 500 kHz frequency, no VRNG or FCB control. | Lacks programmable current limit and light-load mode selection; suited for cost-sensitive, lower-current applications. | Select MPQ4470AGL-Z only when 6 A output suffices and design does not require valley current adjustment or DCM/FCCM flexibility. |
| TPS546D24RQFPR | 10 A, 4.5–18 V input, PMBus interface, integrated telemetry, but no EXTVCC pin or tON(MIN) < 100 ns. | Requires digital configuration; limited to 18 V input; better for closed-loop telemetry systems than standalone analog control. | Choose TPS546D24RQFPR when system-level monitoring, margining, or dynamic voltage scaling via PMBus is required. |
Compared with MPQ4470AGL-Z and TPS546D24RQFPR, the LTC3611EWP#TRPBF uniquely combines 10 A output, sub-100 ns on-time, analog programmability (VRNG/FCB/VON), and EXTVCC support-making it optimal for high-performance, wide-input, analog-controlled POL supplies where layout simplicity and deterministic behavior are critical.
Availability
LTC3611EWP#TRPBF is available at Aetrix Electronics and suitable for telecom point-of-load, industrial FPGA core supply, and automotive ADAS camera module applications requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to 125°C.
Supply support for LTC3611EWP#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3611EWP#TRPBF belongs to Linear's high-current monolithic DC/DC converter product line, designed specifically for demanding point-of-load regulation in space-constrained, high-efficiency systems where thermal performance and analog configurability are essential.
FAQ
What is the maximum recommended junction temperature for the LTC3611EWP#TRPBF?
The LTC3611EWP#TRPBF has a maximum junction temperature (TJMAX) of 125°C, as specified in Absolute Maximum Ratings. Thermal design must ensure TJ ≤ 125°C under worst-case ambient, power dissipation, and PCB copper area conditions, using θJA = 28°C/W (simulated on JESD51-7 board) as a baseline for heatsinking calculations. The LTC3611EWP#TRPBF is rated for operation from –40°C to 125°C junction temperature.
How do I configure the LTC3611EWP#TRPBF for forced continuous conduction mode (FCCM)?
To configure the LTC3611EWP#TRPBF for forced continuous conduction mode, tie the FCB pin (Pin 39) to ground. This disables discontinuous mode operation and maintains synchronous switching even at light loads, reducing output voltage ripple and EMI. Do not leave FCB floating; grounding ensures predictable FCCM behavior across temperature and load. The LTC3611EWP#TRPBF will then operate continuously down to zero load current.
Can the LTC3611EWP#TRPBF be used with an external 5V supply for INTVCC via the EXTVCC pin?
Yes - the LTC3611EWP#TRPBF supports external powering of INTVCC via the EXTVCC pin (Pin 44). When EXTVCC rises above 4.7 V, the internal LDO shuts off and an internal switch connects EXTVCC to INTVCC. This reduces power loss and improves efficiency. Ensure EXTVCC remains ≤7 V and always less than VIN; the LTC3611EWP#TRPBF uses this path to power gate drivers and internal logic without loading the main input rail.
What is the purpose of the VRNG pin on the LTC3611EWP#TRPBF, and how does it affect current limit?
The VRNG pin (Pin 37) on the LTC3611EWP#TRPBF adjusts the maximum valley current limit from 6 A to 15 A by applying 0.7–1.0 V. At 0.7 V (default, tied to GND), typical current limit is 10 A; at 1.0 V, it reaches ~15 A. This directly scales IVALLEY(MAX), enabling precise overcurrent protection tuning without changing sense resistors or external components. The LTC3611EWP#TRPBF datasheet provides "Maximum Valley Current Limit vs VRNG Voltage" curves for exact calibration.
Does the LTC3611EWP#TRPBF require an external bootstrap capacitor, and what are its specifications?
Yes - the LTC3611EWP#TRPBF requires an external bootstrap capacitor (CB) connected between BOOST (Pin 29) and SW (Pins 4–11, 26, 55, 66). A typical value is 0.1 µF X7R ceramic with ≤200 mΩ ESR. CB supplies gate drive voltage for the top MOSFET during high-side switching; undersizing causes BOOT undervoltage and cycle skipping. The LTC3611EWP#TRPBF relies on this capacitor to maintain proper high-side driver operation across all duty cycles and input voltages.
LTC3611EWP#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)
LTC3611EWP#TRPBF FAQ
1.How can I place an order for LTC3611EWP#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3611EWP#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 LTC3611EWP#TRPBF reliable?
The price and inventory of LTC3611EWP#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3611EWP#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3611EWP#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3611EWP#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3611EWP#TRPBF?
LTC3611EWP#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3611EWP#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 LTC3611EWP#TRPBF?
For technical support, including LTC3611EWP#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3611EWP#TRPBF requirements.
6.How does Aetrix verify that LTC3611EWP#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3611EWP#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 LTC3611EWP#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3611EWP#TRPBF?
All LTC3611EWP#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3611EWP#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 LTC3611EWP#TRPBF part is unused and in its original packaging.
Return procedure for LTC3611EWP#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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