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Analog Devices Inc. LTC3613EWKH#TRPBF
- Part No.:
- LTC3613EWKH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
LTC3613EWKH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,310
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Product details
Overview
LTC3613EWKH#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator delivering up to 15A output current with differential remote sensing, supporting 0.6V–5.5V output across 4.5V–24V input. It employs valley current mode control with controlled on-time architecture, enabling fast transient response and constant-frequency operation independent of VIN, VOUT, or load. Used in high-power point-of-load conversion for servers and distributed power systems.
For engineers reviewing the LTC3613EWKH#TRPBF datasheet, LTC3613EWKH#TRPBF pinout, LTC3613EWKH#TRPBF application, or LTC3613EWKH#TRPBF equivalent, key selection criteria include ±0.67% output regulation accuracy, 65ns minimum on-time, differential sensing tolerance to ±500mV ground offset, programmable 200kHz–1MHz switching frequency, and integrated overvoltage/current protection with PGOOD monitoring.
Technical Context
The LTC3613EWKH#TRPBF implements valley current mode control using an internal error amplifier (gm = 1.7 mS) that regulates VOSNS+ − VOSNS− to a precise 0.6V reference. Its controlled on-time architecture synchronizes top-FET turn-on via a PLL system-either to its internal oscillator or an external clock applied to MODE/PLLIN-ensuring stable constant-frequency operation even under wide VIN/VOUT/load variations.
Differential output sensing uses an internal difference amplifier to reject common-mode ground offsets up to ±500mV between local SGND and remote output ground. Current sensing supports both RSENSE and DCR methods, with VRNG-selectable threshold range (30mV to 50mV), while ITH voltage (0–2.4V) directly sets the valley current limit with foldback behavior during overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and server supply rails without pre-regulation |
| Output Voltage Range | 0.6V to 5.5V at up to 15A - enables core voltage scaling for modern processors and FPGAs |
| Output Regulation Accuracy | ±0.67% - achieved via precision 0.6V reference and differential sensing, insensitive to PCB ground bounce |
| Switching Frequency | 200kHz to 1MHz (programmable via RT resistor) - allows EMI optimization and inductor size trade-offs |
| Min On/Off Time | tON(MIN) = 65ns, tOFF(MIN) = 105ns - enables near 0% and near 100% duty cycles for extreme input-output ratios |
| Current Sensing | RSENSE or DCR-based with VRNG-selectable full-scale range (30–50mV) - supports accurate, low-loss sensing across load conditions |
| Power Good Threshold | ±7.5% window around regulated VOUT - provides reliable system-level power sequencing and fault detection |
| Shutdown Quiescent Current | IQ = 15μA - enables ultra-low power standby in always-on subsystems |
Pinout & Package
Package: 56-lead (7mm × 9mm) thermally enhanced QFN with exposed PVIN, SW, and SGND pads requiring solder connection to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1–9, 53–56, 57) | High-current input supply | Connects to drain of internal N-MOSFETs; must be routed with low-inductance, high-copper-area traces |
| SW (Pins 10, 35, 45–51, 58) | Switch node | Drives external bootstrap capacitor; swings from ~–0.3V to VIN; requires tight layout to minimize ringing |
| BOOST (Pin 11) | Bootstrap supply | Provides floating gate drive for top MOSFET; connects to cathode of Schottky diode and (+) terminal of CB |
| SGND (Pins 12, 16, 17, 19, 28, 29, 59) | Signal ground reference | Reference for all analog circuitry; must connect to PGND at single point to avoid noise coupling |
| VOSNS+, VOSNS− (Pins 21, 20) | Differential output sense inputs | Enable remote sensing with ±500mV common-mode rejection; VOSNS− sinks 35μA bias current |
| SENSE+, SENSE− (Pins 14, 15) | Differential current sense inputs | Kelvin-connected across sense resistor or DCR filter; reject PCB trace resistance errors |
| ITH (Pin 23) | Error amplifier output / current limit control | 0–2.4V voltage sets valley current threshold; used for compensation and current limiting |
| RT (Pin 25) | Frequency programming | Resistor to SGND sets free-running frequency; also defines lock range for external clock synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Rejects up to ±500mV ground potential difference between controller and load, ensuring ±0.67% regulation accuracy in noisy PCB environments |
| Controlled on-time valley current mode | Delivers fast load transient response (<10μs recovery) while maintaining constant switching frequency across line, load, and temperature |
| Programmable and synchronizable switching frequency | 200kHz–1MHz adjustment via RT resistor; external clock sync on MODE/PLLIN enables EMI reduction in dense multi-rail systems |
| Voltage tracking soft-start | TRACK/SS pin accepts external capacitor or resistor divider to enable controlled ramp-up or master-slave sequencing of multiple regulators |
| Comprehensive protection suite | Includes overvoltage shutdown (immediate MT off), foldback current limiting, PGOOD monitoring, and INTVCC UVLO (3.65V release) |
| Flexible power sourcing | Internal LDO powers INTVCC from PVIN unless EXTVCC > 4.6V, enabling higher efficiency by bypassing LDO losses |
Applications
| Server Core Voltage Regulation | Industrial FPGA Power Supply |
|---|---|
Use Scenario: Regulating 1.2V/12A core supply for dual-socket Xeon servers with tight transient requirements and board-level ground noise. IC Role / Device Role / Timing Role: Primary synchronous buck controller with differential remote sensing to compensate for VRM-to-CPU ground path IR drop. Use Value: Maintains ±0.67% output accuracy despite ±300mV ground offset; 65ns tON(MIN) supports 12V→1.2V conversion at 500kHz without pulse skipping. |
Use Scenario: Providing 0.85V/10A supply to high-end Artix/Kintex FPGAs in programmable logic controllers with strict sequencing and thermal constraints. IC Role / Device Role / Timing Role: High-current POL converter with TRACK/SS-enabled voltage ramping to meet FPGA configuration timing and avoid inrush stress. Use Value: Soft-start time programmable via external capacitor; forced continuous mode eliminates light-load frequency variation that could interfere with FPGA clock domains. |
| Telecom Baseband Power | Automotive ADAS Domain Controller |
Use Scenario: Generating 3.3V/8A supply for LTE/5G baseband processors in compact, air-cooled macrocell units with stringent EMI limits. IC Role / Device Role / Timing Role: EMI-optimized buck regulator synchronized to system clock via MODE/PLLIN to shift switching harmonics away from sensitive RF bands. Use Value: External clock sync locks switching edge to system timing reference; 200kHz–1MHz range allows harmonic placement below 1st IF stage. |
Use Scenario: Delivering 1.8V/6A to radar SoCs in automotive domain controllers where junction temperature must stay ≤125°C under continuous 85°C ambient. IC Role / Device Role / Timing Role: Thermally robust monolithic buck with exposed PVIN/SW/SGND pads and θJA = 29°C/W for direct PCB heatsinking. Use Value: 7mm × 9mm QFN package with multiple thermal vias supports >10W dissipation; PGOOD confirms stable rail before SoC boot sequence proceeds. |
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 |
|---|---|---|---|
| MP8770GQ-Z (Monolithic Power) | 12A max output, 2.5V–18V input, fixed 500kHz/750kHz options, no differential sensing | Lacks remote sensing; suitable only for local-sense applications with <±50mV ground offset | Select when cost sensitivity outweighs accuracy needs and ground paths are short |
| TPS546D24RVR (Texas Instruments) | 40A dual-phase, PMBus interface, 3.5V–18V input, supports AVS and telemetry | Higher integration with digital control; requires PMBus host and firmware support | Choose for systems needing dynamic voltage scaling, real-time telemetry, or multi-phase current sharing |
Compared with MP8770GQ-Z, the LTC3613EWKH#TRPBF delivers superior output accuracy under ground noise and higher peak current; versus TPS546D24RVR, it offers simpler analog design with no digital overhead but lacks programmability and telemetry.
Availability
LTC3613EWKH#TRPBF is available at Aetrix Electronics and suitable for server power delivery, industrial FPGA supplies, telecom baseband conversion, and automotive ADAS domain controllers requiring stable component supply across long production lifecycles.
Supply support for LTC3613EWKH#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3613EWKH#TRPBF belongs to Linear's monolithic high-current buck regulator family, designed specifically for demanding point-of-load applications where accuracy, thermal performance, and noise immunity are critical in space-constrained systems.
FAQ
What is the maximum supported output current for the LTC3613EWKH#TRPBF?
The LTC3613EWKH#TRPBF is rated for up to 15A continuous output current under proper thermal conditions-achieved using the 7mm × 9mm QFN package with exposed PVIN/SW/SGND pads soldered to multilayer PCB copper planes. Actual achievable current depends on ambient temperature, airflow, and layout; derating is required above 85°C ambient or with limited copper area.
Does the LTC3613EWKH#TRPBF support remote output voltage sensing?
Yes, the LTC3613EWKH#TRPBF supports true differential remote sensing via VOSNS+ and VOSNS− pins, allowing regulation accuracy of ±0.67% even when the remote output ground deviates from local SGND by up to ±500mV-critical for high-current PCBs with significant IR drop in ground paths.
How is switching frequency set and synchronized on the LTC3613EWKH#TRPBF?
Switching frequency is set by an external resistor from RT to SGND, programming 200kHz–1MHz. For synchronization, an external clock applied to MODE/PLLIN must fall within ±30% of the RT-set frequency and meet logic thresholds (HI >2V, LO <0.5V); successful sync forces continuous conduction mode and aligns top-FET turn-on edges.
What protection features does the LTC3613EWKH#TRPBF include?
The LTC3613EWKH#TRPBF integrates overvoltage protection (OVP) with immediate top-FET shutdown, foldback current limiting during short-circuit, PGOOD monitoring with ±7.5% window and 10μs/20μs rise/fall delays, INTVCC undervoltage lockout (3.65V release), and thermal shutdown at TJ = 125°C-providing comprehensive fault coverage without external components.
Can the LTC3613EWKH#TRPBF operate with an external 5V supply for gate drive?
Yes, the LTC3613EWKH#TRPBF supports external bias via EXTVCC: when voltage exceeds 4.6V, the internal LDO shuts down and EXTVCC is internally connected to INTVCC, reducing self-heating and improving efficiency-ideal for systems where the output rail (e.g., 5V or 3.3V) can power the controller's gate drivers and logic.
LTC3613EWKH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- 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):
- 24V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 15A
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-QFN Multipad (7x9)
LTC3613EWKH#TRPBF FAQ
1.How can I place an order for LTC3613EWKH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3613EWKH#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 LTC3613EWKH#TRPBF reliable?
The price and inventory of LTC3613EWKH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3613EWKH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3613EWKH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3613EWKH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3613EWKH#TRPBF?
LTC3613EWKH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3613EWKH#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 LTC3613EWKH#TRPBF?
For technical support, including LTC3613EWKH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3613EWKH#TRPBF requirements.
6.How does Aetrix verify that LTC3613EWKH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3613EWKH#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 LTC3613EWKH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3613EWKH#TRPBF?
All LTC3613EWKH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3613EWKH#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 LTC3613EWKH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3613EWKH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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