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Analog Devices Inc. LTC3613IWKH#TRPBF
- Part No.:
- LTC3613IWKH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
LTC3613IWKH#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15A 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
LTC3613IWKH#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 65ns minimum on-time and 105ns minimum off-time, enabling near 0% and near 100% duty cycles for high VIN-to-VOUT ratios. Used in server point-of-load power delivery where ±0.67% output regulation under ±500mV ground offset is required.
For engineers reviewing the LTC3613IWKH#TRPBF datasheet, LTC3613IWKH#TRPBF pinout, LTC3613IWKH#TRPBF application, or LTC3613IWKH#TRPBF equivalent, key selection criteria include differential output sensing capability, programmable 200kHz–1MHz switching frequency with external clock synchronization, RSENSE/DCR current sensing with foldback protection, 7mm × 9mm 56-pin QFN thermal performance, and micropower shutdown (15μA).
Technical Context
The LTC3613IWKH#TRPBF implements a controlled on-time valley current mode architecture that maintains constant switching frequency independent of input voltage, output voltage, and load-enabling fast transient response and precise current sharing across parallel regulators. Its differential feedback loop (VOSNS+ – VOSNS–) references a precision 0.6V internal bandgap, achieving ±0.67% regulation even with 500mV common-mode ground deviation between local and remote output grounds.
Switching is governed by an internal oscillator programmable via RT pin resistor (200kHz–1MHz), with phase-lock capability to external clocks for EMI reduction. The ITH pin serves as both error amplifier output and current threshold control point (0–2.4V), while VRNG selects maximum sense voltage (30mV/39mV/50mV) to match RSENSE or DCR sensing configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide-range industrial and server inputs including 12V and 24V distribution rails. |
| Output Voltage Range | 0.6V to 5.5V - covers core logic, FPGA, ASIC, and memory supply requirements with adjustable feedback divider. |
| Max Output Current | 15A - delivered continuously in thermally optimized PCB layout with exposed pad soldered to thermal plane. |
| Output Voltage Accuracy | ±0.67% - guaranteed over line, load, temperature, and ±500mV remote ground offset via differential sensing. |
| Switching Frequency | 200kHz to 1MHz - set by RT resistor; synchronizable to external clock within ±30% for noise-sensitive applications. |
| Min On/Off Time | tON(MIN) = 65ns, tOFF(MIN) = 105ns - enables high step-down ratios (e.g., 12V→1.2V at >90% duty cycle) without pulse skipping. |
| Shutdown Quiescent Current | 15μA - achieved when RUN pin < 0.75V, enabling low-power standby in always-on systems. |
Pinout & Package
Package: 56-lead (7mm × 9mm) plastic QFN with exposed thermal pad (WKH). Requires soldering of PVIN, SW, SGND, PGND, and exposed pad to PCB copper for rated thermal performance (θJA = 29°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (Pins 1–9, 53–56, 57) | Power Input Supply | Connects to drain of internal N-channel MOSFETs; supplies gate drive and bias circuits; must be decoupled with ≥10μF ceramic + bulk capacitance. |
| SW (Pins 10, 35, 45–51, 58) | Switch Node | High-side switch output node; connects to bootstrap capacitor (–) and inductor; swings from ~–0.3V to VIN; requires low-inductance layout. |
| BOOST (Pin 11) | Bootstrap Driver Supply | Supplies floating gate drive for top MOSFET; connects to (+) of bootstrap capacitor and Schottky diode cathode. |
| VOSNS+, VOSNS– (Pins 21, 20) | Differential Output Sense Inputs | Measure remote output voltage across feedback divider; tolerate ±500mV common-mode ground offset relative to SGND. |
| SENSE+, SENSE– (Pins 14, 15) | Differential Current Sense Inputs | Kelvin-connected across RSENSE or DCR filter; enable accurate valley current detection for regulation and foldback limiting. |
| ITH (Pin 23) | Error Amplifier Output / Current Threshold | 0–2.4V analog control voltage setting valley current limit; also used for loop compensation via external RC network. |
| RT (Pin 25) | Frequency Programming | Internal 1.2V reference; connect resistor to SGND to set free-running frequency (e.g., 115kΩ → 500kHz). |
| RUN (Pin 26) | Digital Enable/Shutdown Control | 1.2V threshold for enable; <0.75V triggers 15μA shutdown; internal 1.3μA pull-up allows resistor-free startup. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Enables ±0.67% regulation accuracy despite ±500mV ground potential difference between controller and load, critical for distributed power systems. |
| Controlled on-time valley current mode | Delivers constant-frequency operation and fast transient response independent of VIN/VOUT/load, with inherent current-sharing capability for multiphase designs. |
| Programmable & synchronizable switching frequency | 200kHz–1MHz range set by single RT resistor; external clock sync on MODE/PLLIN reduces EMI peaks and enables multi-regulator phase alignment. |
| Voltage tracking soft-start | TRACK/SS pin accepts external capacitor or resistor divider to ramp output voltage smoothly or track master supply-prevents inrush and sequencing faults. |
| Overvoltage protection with zero-delay shutdown | PGOOD asserts low within 20μs of fault; overvoltage condition forces immediate top-FET turn-off and bottom-FET conduction to clamp output. |
| External VCC bypass support | EXTVCC pin accepts ≥4.6V external supply (e.g., regulated output) to disable internal LDO, reducing self-heating and improving full-load efficiency by ~1–2%. |
Applications
| Server Point-of-Load Regulation | FPGA Core Power Delivery |
|---|---|
Use Scenario: Regulating 1.2V/15A for high-performance CPU cores in 1U rack servers with tight thermal constraints and strict voltage tolerance. IC Role / Device Role / Timing Role: Primary step-down regulator with differential remote sensing to compensate for PCB plane resistance between VRM and socket. Use Value: Maintains ±0.67% output accuracy despite 300mV ground shift between motherboard VRM location and CPU socket, ensuring reliable operation under dynamic load transients. |
Use Scenario: Supplying configurable logic fabric (CLB) and DSP slices in Xilinx Versal ACAPs requiring tightly regulated 0.8V at up to 12A. IC Role / Device Role / Timing Role: High-current buck controller with programmable soft-start and tracking to coordinate with auxiliary I/O bank supplies during configuration. Use Value: TRACK/SS pin enables synchronized ramp-up with 1.8V I/O rail, preventing latch-up and meeting FPGA power sequencing requirements per Xilinx DS923. |
| Industrial PLC Backplane Converter | Telecom Baseband Processor Supply |
Use Scenario: Generating 3.3V/10A from 24V backplane for real-time I/O modules operating in –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Robust DC/DC regulator with extended temperature grade (–40°C to 125°C junction), EXTVCC support, and foldback current limiting. Use Value: Micropower shutdown (15μA) enables cold-swap capability; EXTVCC bypass improves efficiency at full load, reducing thermal stress in sealed enclosures. |
Use Scenario: Powering 5G baseband processors (e.g., Intel Atom C3000) requiring 1.0V/15A with low-noise, low-EMI operation in dense RF environments. IC Role / Device Role / Timing Role: Synchronizable buck regulator with forced continuous mode and external clock lock to avoid interference with adjacent RF front-end receivers. Use Value: External clock sync eliminates beat frequencies; 65ns tON(MIN) supports 48V→1.0V conversion in single-stage design, simplifying power architecture. |
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 |
|---|---|---|---|
| MPQ8633BGLE-Z (Monolithic Power Systems) | 4.5V–16V input, 0.6V–5.5V output, 12A max, 500kHz fixed freq, no differential sensing, no external clock sync. | Lacks remote sensing and frequency synchronization-unsuitable for ground-isolated loads or EMI-critical telecom systems. | Select only for cost-sensitive, space-constrained designs where ±1% regulation and fixed frequency suffice. |
| TPS53689TDSQR (Texas Instruments) | 4.5V–16V input, 0.5V–2.5V output, 16A max, supports PMBus, differential sensing, but no sub-100ns min on-time or EXTVCC bypass. | Requires digital interface infrastructure; limited to ≤2.5V outputs; lacks ultra-low tON for high-ratio conversion. | Prefer when telemetry, margining, or multi-rail coordination via PMBus is required-but not for 12V→1.0V direct conversion. |
Compared with MPQ8633BGLE-Z and TPS53689TDSQR, the LTC3613IWKH#TRPBF uniquely combines differential remote sensing, 65ns minimum on-time, external clock synchronization, and EXTVCC bypass in a single 56-pin QFN-making it the only option among the three capable of maintaining ±0.67% regulation across ±500mV ground offsets while supporting 24V input and 15A output in forced continuous mode.
Availability
LTC3613IWKH#TRPBF is available at Aetrix Electronics and suitable for server point-of-load converters, FPGA core power delivery, and industrial PLC backplane regulators requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LTC3613IWKH#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 continues its legacy of high-performance analog, power management, and signal conditioning ICs for demanding industrial, automotive, and communications applications.
The LTC3613IWKH#TRPBF belongs to Linear's monolithic high-current buck regulator product line, designed specifically for high-efficiency, high-accuracy point-of-load power delivery in datacenter, telecom, and industrial systems where thermal density and regulation precision are critical.
FAQ
What is the operating temperature range for the LTC3613IWKH#TRPBF?
The LTC3613IWKH#TRPBF is specified for operation from –40°C to +125°C junction temperature. This industrial-grade rating is guaranteed by design, characterization, and statistical process control-not just tested-and applies across all electrical specifications including output voltage accuracy, current limit, and switching frequency stability.
How does differential output sensing work in the LTC3613IWKH#TRPBF?
In the LTC3613IWKH#TRPBF, differential sensing uses VOSNS+ and VOSNS– pins to measure the voltage across the external feedback resistor divider placed directly at the load. The internal difference amplifier rejects common-mode ground offset up to ±500mV between local controller ground and remote load ground, enabling ±0.67% regulation accuracy even when PCB plane resistance introduces significant ground potential differences.
Can the LTC3613IWKH#TRPBF synchronize to an external clock, and what are the requirements?
Yes, the LTC3613IWKH#TRPBF can synchronize to an external clock applied to the MODE/PLLIN pin. The external clock frequency must be within ±30% of the free-running frequency set by the RT resistor. Input levels require >2V for logic high and <0.5V for logic low. Synchronization forces continuous conduction mode and aligns the rising edge of each switching cycle to the external clock's rising edge.
What is the purpose of the EXTVCC pin on the LTC3613IWKH#TRPBF?
The EXTVCC pin on the LTC3613IWKH#TRPBF allows bypassing the internal 5.3V LDO regulator. When a clean ≥4.6V external supply (e.g., the regulator's own output) is applied, the internal LDO shuts down and EXTVCC directly powers INTVCC. This reduces power dissipation inside the IC, lowers self-heating, and improves full-load efficiency-especially beneficial in thermally constrained 15A applications.
Does the LTC3613IWKH#TRPBF support current limit foldback, and how is it implemented?
Yes, the LTC3613IWKH#TRPBF implements programmable current limit foldback. When output voltage collapses due to overload or short circuit, the ITH voltage is clamped to 1.2V and reduced proportionally, lowering the current sense threshold and reducing delivered current. This protects MOSFETs and magnetics during sustained faults while allowing automatic recovery once the fault clears.
LTC3613IWKH#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)
LTC3613IWKH#TRPBF FAQ
1.How can I place an order for LTC3613IWKH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3613IWKH#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 LTC3613IWKH#TRPBF reliable?
The price and inventory of LTC3613IWKH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3613IWKH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3613IWKH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3613IWKH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3613IWKH#TRPBF?
LTC3613IWKH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3613IWKH#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 LTC3613IWKH#TRPBF?
For technical support, including LTC3613IWKH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3613IWKH#TRPBF requirements.
6.How does Aetrix verify that LTC3613IWKH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3613IWKH#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 LTC3613IWKH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3613IWKH#TRPBF?
All LTC3613IWKH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3613IWKH#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 LTC3613IWKH#TRPBF part is unused and in its original packaging.
Return procedure for LTC3613IWKH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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