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Analog Devices Inc. LTC3613EWKH#PBF
- Part No.:
- LTC3613EWKH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
LTC3613EWKH#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,652
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Product details
Overview
LTC3613EWKH#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator supporting 4.5V–24V input and 0.6V–5.5V output at up to 15A continuous current. It employs valley current mode control with differential output sensing, delivers ±0.67% output regulation accuracy, and features programmable 200kHz–1MHz switching frequency. It is used in high-power point-of-load conversion for server VRMs and distributed power systems.
For engineers reviewing the LTC3613EWKH#PBF datasheet, LTC3613EWKH#PBF pinout, LTC3613EWKH#PBF application, or LTC3613EWKH#PBF equivalent, key selection considerations include its 56-pin 7mm × 9mm QFN package, 65ns minimum on-time, differential remote-sense capability up to ±500mV ground offset, RSENSE/DCR current sensing, and phase-synchronizable switching clock interface.
Technical Context
The LTC3613EWKH#PBF implements a controlled on-time valley current mode architecture that maintains constant switching frequency independent of VIN, VOUT, and load while enabling fast transient response. Its error amplifier (gm = 1.7 mS typ.) regulates VOSNS+ − VOSNS− to a 0.6V internal reference, and the ITH pin serves as both compensation node and current threshold control point.
Differential output sensing uses an internal difference amplifier to reject common-mode ground offsets up to ±500mV between local SGND and remote output ground. The device supports dual operating modes-pulse-skipping (discontinuous) when MODE/PLLIN = SGND, or forced continuous mode when MODE/PLLIN = INTVCC or driven by an external clock within ±30% of the programmed RT frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and server supply rails including 5V, 12V, and 24V bus inputs. |
| Output Voltage Range | 0.6V to 5.5V - enables core voltage regulation for modern CPUs, FPGAs, and ASICs. |
| Max Output Current | 15A continuous - delivered via integrated N-channel MOSFETs with 7.5 mΩ top / 5.5 mΩ bottom RDS(ON). |
| Output Regulation Accuracy | ±0.67% - achieved via precision 0.6V reference and differential sensing, stable over line/load/temperature. |
| Switching Frequency | 200kHz to 1MHz - set by RT resistor; synchronizable to external clock for EMI reduction. |
| Min On/Off Time | tON(MIN) = 65ns / tOFF(MIN) = 105ns - enables near 0% and near 100% duty cycles for extreme VIN/VOUT ratios. |
| Shutdown Quiescent Current | IQ = 15μA - ultra-low power disable state suitable for system-level power sequencing. |
Pinout & Package
Package: 56-lead (7mm × 9mm) thermally enhanced QFN with exposed PVIN, SW, SGND, and PGND pads requiring PCB solder connection for electrical integrity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1–9, 53–56, 57) | Power Input Supply | Drain connection for internal high-side MOSFET; must be connected to 4.5V–24V input rail and thermally anchored via exposed pad. |
| SW (10, 35, 45–51, 58) | Switch Node | Connection point for external bootstrap capacitor (–) and inductor; swings from ~–0.3V to VIN; requires low-inductance layout. |
| BOOST (11) | Bootstrap Driver Supply | Supplies floating gate drive for high-side MOSFET; connects to (+) of bootstrap cap and Schottky diode cathode. |
| VOSNS+ (21) / VOSNS– (20) | Differential Output Sense Inputs | Measure remote output voltage across feedback divider; tolerate ±500mV common-mode ground offset vs local SGND. |
| SENSE+ (14) / SENSE– (15) | Differential Current Sense Inputs | Kelvin-connected across sense resistor or DCR filter; enable accurate valley current monitoring for regulation and protection. |
| ITH (23) | Error Amplifier Output / Current Threshold Control | Compensation node and direct control of current limit threshold; voltage range 0V–2.4V sets peak/valley current level. |
| MODE/PLLIN (31) | Sync Clock Input / Mode Select | Accepts external clock (2V–6V HI, 0–0.5V LO) for synchronization; ties to INTVCC to force continuous conduction mode. |
| PGOOD (13) | Open-Drain Power Good Monitor | Asserts low when VOSNS+−VOSNS− deviates >±7.5% from 0.6V reference; includes 10μs rise / 20μs fall delay for glitch immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Differential Remote Output Sensing | Rejects up to ±500mV ground potential difference between controller SGND and load return path, ensuring ±0.67% regulation accuracy in noisy or distributed layouts. |
| Controlled On-Time Valley Current Mode | Delivers constant-frequency operation across all input/output/load conditions while preserving fast transient response and precise current sharing in multi-phase designs. |
| Programmable & Synchronizable Switching | RT resistor sets 200kHz–1MHz free-running frequency; external clock on MODE/PLLIN enables EMI-sensitive applications and deterministic noise placement. |
| Voltage Tracking Soft-Start | TRACK/SS pin accepts external capacitor or resistor divider to ramp output voltage smoothly or track master supply during power-up, preventing inrush and sequencing faults. |
| Comprehensive Fault Protection | Includes overvoltage lockout (immediate MT off), foldback current limiting, PGOOD monitoring, and UVLO on INTVCC (3.65V release threshold). |
Applications
| Server VRM Core Regulation | Industrial High-Power POL |
|---|---|
Use Scenario: Regulating 1.5V/15A CPU core supply from 12V intermediate bus in rack-mounted servers. IC Role / Device Role / Timing Role: Primary synchronous buck controller with differential remote sensing and phase-synchronizable switching for multi-rail coordination. Use Value: Maintains ±0.67% output accuracy despite PCB ground bounce up to ±500mV, enabling reliable CPU operation under dynamic load transients. | Use Scenario: Providing 3.3V/12A power to FPGA I/O banks in factory automation PLCs with strict EMI limits. IC Role / Device Role / Timing Role: High-current step-down regulator operating in forced continuous mode synchronized to system clock to suppress switching noise in analog signal paths. Use Value: 200kHz–1MHz programmable frequency allows tuning to avoid sensitive frequency bands; 65ns tON enables stable 3.3V output from 24V input. |
| Telecom Baseband Power | High-Density Data Center PSU |
Use Scenario: Generating 0.85V/10A supply for ASIC baseband processors in 5G radio units with tight thermal constraints. IC Role / Device Role / Timing Role: Monolithic buck converter using EXTVCC bypass to improve efficiency and reduce self-heating when powered from auxiliary 5V rail. Use Value: Internal LDO shutdown at EXTVCC >4.6V reduces thermal dissipation by >1W at full load, extending reliability in sealed enclosures. | Use Scenario: Parallel-configured POL stage delivering 1.2V/30A (two LTC3613EWKH#PBF in current-sharing mode) to GPU compute modules. IC Role / Device Role / Timing Role: Synchronous buck controller leveraging valley current mode architecture for inherent current matching without external DACs or current-sense amplifiers. Use Value: Excellent current sharing capability eliminates need for external current-balancing circuitry, reducing BOM count and layout complexity. |
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) | 4.5V–16V input, 0.6V–5.5V output, 12A max; fixed 500kHz/750kHz options; no differential remote sensing. | Lacks ±500mV ground offset tolerance; less suitable for high-accuracy remote loads with long traces. | Select when cost sensitivity outweighs remote-sense accuracy requirements and input voltage stays ≤16V. |
| TPS546D24RQFPR (Texas Instruments) | 4.5V–18V input, 0.5V–5.5V output, 15A; PMBus interface; differential sensing supported; 2.5mm × 3.5mm QFN-22. | Smaller package but lower thermal capacity; digital control adds configuration overhead but enables telemetry and margining. | Select when digital monitoring, margining, or tighter board area constraints dominate over analog simplicity and thermal robustness. |
Compared with MP8770GQ-Z and TPS546D24RQFPR, the LTC3613EWKH#PBF uniquely combines 24V input support, true differential remote sensing with ±500mV tolerance, and monolithic 15A capability in a thermally optimized 7mm × 9mm QFN-making it preferred for high-reliability, high-accuracy server and telecom POL designs where analog simplicity and thermal headroom are critical.
Availability
LTC3613EWKH#PBF is available at Aetrix Electronics and suitable for server VRMs, industrial POL converters, and telecom baseband power supplies requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance across –40°C to 125°C junction temperature.
Supply support for LTC3613EWKH#PBF 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. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3613EWKH#PBF belongs to the LTC® monolithic high-current DC/DC regulator product line, engineered for demanding point-of-load applications where accuracy, thermal resilience, and noise-controlled switching are essential in space-constrained, high-power systems.
FAQ
What is the maximum input voltage rating for the LTC3613EWKH#PBF?
The LTC3613EWKH#PBF has an absolute maximum PVIN/SVIN rating of 24V, with recommended operating input voltage range specified as 4.5V to 24V. Exceeding 24V may cause permanent damage per Absolute Maximum Ratings. The device maintains stable regulation across this full range, including support for 12V and 24V intermediate bus architectures commonly used in servers and industrial equipment.
How does differential output sensing work on the LTC3613EWKH#PBF?
The LTC3613EWKH#PBF uses dedicated VOSNS+ and VOSNS– pins to measure the output voltage differentially across the feedback resistor divider, rejecting common-mode ground offsets up to ±500mV between local signal ground and remote load ground. This ensures ±0.67% output regulation accuracy even when PCB layout introduces significant ground potential differences-critical for high-current POL applications with long power delivery paths.
Can the LTC3613EWKH#PBF operate with inductor DCR current sensing?
Yes, the LTC3613EWKH#PBF supports both RSENSE and inductor DCR current sensing. For DCR sensing, Kelvin connections are made from SENSE+ and SENSE– to opposite ends of an RC filter placed across the inductor. The VRNG pin configures the current sense threshold range (e.g., 30mV to 50mV), and the ITH pin provides direct access to the valley current comparator threshold for compensation and stability tuning.
What is the purpose of the MODE/PLLIN pin on the LTC3613EWKH#PBF?
The MODE/PLLIN pin on the LTC3613EWKH#PBF serves two functions: (1) as a phase-lock input to synchronize switching to an external clock for EMI reduction, and (2) as a mode select pin-tied to INTVCC or driven by a clock to enforce forced continuous conduction mode, or tied to SGND to enable pulse-skipping (discontinuous) mode at light loads. An internal 600kΩ pull-down ensures defined behavior when unconnected.
Does the LTC3613EWKH#PBF support external VCC biasing, and why is it useful?
Yes, the LTC3613EWKH#PBF supports external VCC biasing via the EXTVCC pin. When EXTVCC exceeds 4.6V, the internal LDO shuts down and INTVCC is sourced directly from EXTVCC, reducing power loss and self-heating. This is especially beneficial when the regulated output voltage is ≥4.6V (e.g., 5V POL), improving overall efficiency by >2% at full load and enhancing thermal performance in compact, high-density layouts.
LTC3613EWKH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 56-VFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3613EWKH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3613EWKH#PBF 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#PBF reliable?
The price and inventory of LTC3613EWKH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3613EWKH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3613EWKH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3613EWKH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3613EWKH#PBF?
LTC3613EWKH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3613EWKH#PBF 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#PBF?
For technical support, including LTC3613EWKH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3613EWKH#PBF requirements.
6.How does Aetrix verify that LTC3613EWKH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3613EWKH#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC3613EWKH#PBF?
All LTC3613EWKH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3613EWKH#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC3613EWKH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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