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Analog Devices Inc. LTC3613IWKH#PBF
- Part No.:
- LTC3613IWKH#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 56-VFQFN Exposed Pad
- Datasheet:
-
LTC3613IWKH#PBF.pdf
- Description:
- IC REG BUCK ADJ 15A 56QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,596
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Product details
Overview
LTC3613IWKH#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. It employs valley current mode control with differential output sensing, delivers ±0.67% output voltage regulation, and features programmable 200kHz–1MHz switching frequency. Used in high-current point-of-load conversion for servers and distributed power systems.
For engineers reviewing the LTC3613IWKH#PBF datasheet, LTC3613IWKH#PBF pinout, LTC3613IWKH#PBF application, or LTC3613IWKH#PBF equivalent, key selection considerations include its 56-pin 7mm × 9mm QFN package, 65ns minimum on-time, differential remote-sense capability accommodating ±500mV ground offset, and integrated overvoltage protection with PGOOD monitoring.
Technical Context
The LTC3613IWKH#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 precision 0.6V internal reference, and the PLL-based synchronization allows phase alignment to external clocks within ±30% frequency tolerance.
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 thresholds (30mV/39mV/50mV max), and foldback current limiting activates during short-circuit conditions with ITH clamping to 1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and server rail inputs including 12V and 24V distribution buses. |
| Output Voltage Range | 0.6V to 5.5V - enables core voltage regulation for modern CPUs, FPGAs, and ASICs. |
| Max Output Current | 15A - delivers high power density in single-chip solution without external MOSFETs. |
| Output Voltage Accuracy | ±0.67% - achieved via differential sensing and 0.6V reference, stable over line/load/temperature. |
| Switching Frequency | 200kHz to 1MHz - set by RT resistor or synchronized to external clock for EMI control. |
| Min On/Off Time | tON(MIN) = 65ns, tOFF(MIN) = 105ns - enables near 0% and near 100% duty cycles for extreme input-output ratios. |
| Shutdown Quiescent Current | IQ = 15μA - ultra-low power disable state suitable for system-level power sequencing. |
Pinout & Package
Package: 56-lead (7mm × 9mm) plastic QFN with exposed thermal pad (WKH). Requires soldering of PVIN, SW, SGND, and PGND exposed pads to PCB for rated thermal performance (θJA = 29°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (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 locally. |
| SW (10, 35, 45–51, 58) | Switch Node | Drain connection of top MOSFET; drives bootstrap capacitor (CB) for high-side gate drive; swings from –0.3V to VIN. |
| BOOST (11) | Bootstrap Supply | Connects to (+) terminal of CB and Schottky diode cathode; provides floating supply for high-side driver. |
| SGND (12, 16, 17, 19, 28, 29, 59) | Signal Ground | Reference for all small-signal pins (ITH, TRACK/SS, VOSNS±); connect to PGND at single point only. |
| VOSNS+ (21) / VOSNS– (20) | Differential Output Sense | Measure remote output voltage across feedback divider; tolerate ±500mV common-mode ground offset. |
| SENSE+ (14) / SENSE– (15) | Current Sense Inputs | Kelvin-connected across sense resistor or DCR filter; support accurate valley current detection. |
| RT (25) | Frequency Programming | Internal 1.2V reference; external resistor sets oscillator frequency from 200kHz to 1MHz. |
| MODE/PLLIN (31) | Sync Input / Mode Control | Accepts external clock for EMI reduction; also selects forced continuous or pulse-skipping light-load operation. |
Key Features
| Feature | Design Value |
|---|---|
| Differential output voltage sensing | Enables precise regulation despite ±500mV ground potential difference between controller and load. |
| Controlled on-time valley current mode | Delivers constant-frequency operation and excellent current sharing across paralleled regulators. |
| Programmable current limit with foldback | Protects against overload and short-circuit by reducing peak current threshold when VOUT collapses. |
| Voltage tracking soft-start | Allows coordinated ramp-up of multiple rails using resistor-divider or capacitor-based timing on TRACK/SS pin. |
| External VCC bypass (EXTVCC) | Shuts down internal LDO and powers INTVCC directly from ≥4.6V source, improving efficiency and reducing self-heating. |
Applications
| Server Point-of-Load Regulation | High-Density FPGA Core Supply |
|---|---|
Use Scenario: Regulating 1.5V/15A core voltage for dual-socket x86 servers with tight transient requirements. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing full load current, differential remote sensing, and PGOOD sequencing. Use Value: ±0.67% accuracy and 65ns tON(MIN) ensure stable core voltage under rapid CPU load steps up to 10A/μs. |
Use Scenario: Powering 0.85V–1.2V banks of high-end FPGAs in telecom baseband cards with strict ripple and sequencing needs. IC Role / Device Role / Timing Role: Monolithic step-down regulator providing low-noise, tracked startup and robust overcurrent protection. Use Value: TRACK/SS pin enables voltage ramp matching with auxiliary rails; foldback current limit prevents damage during configuration faults. |
| Distributed Power System Bus Converter | Industrial PLC CPU Module Supply |
Use Scenario: Converting 24V intermediate bus to 3.3V/10A for backplane I/O and communication subsystems. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in forced continuous mode synchronized to system clock for EMI compliance. Use Value: MODE/PLLIN synchronization eliminates beat frequencies; 24V input rating avoids need for pre-regulation stages. |
Use Scenario: Delivering 5V/8A to ARM-based PLC controllers in harsh environments requiring extended temperature operation. IC Role / Device Role / Timing Role: Industrial-grade DC/DC regulator with –40°C to 125°C guaranteed junction range and robust fault signaling. Use Value: PGOOD output with 10μs rise/fall delay enables reliable system reset assertion; micropower shutdown (15μA) supports battery-backed sleep modes. |
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–18V input, 0.6V–5.5V output, 12A max; no differential output sensing; fixed 500kHz/750kHz options. | Lacks ±500mV remote ground tolerance; less suitable for high-accuracy remote-sense applications. | Select when cost sensitivity outweighs need for differential sensing and wider input range. |
| TPS53689T (Texas Instruments) | 4.5V–18V input, 0.5V–5.5V output, 16A max; supports PMBus; requires external current sense resistor. | Includes digital interface and telemetry but adds complexity; no integrated EXTVCC bypass path. | Prefer when system-level telemetry, margining, or multi-rail coordination via PMBus is required. |
Compared with MP8770GQ-Z and TPS53689T, the LTC3613IWKH#PBF uniquely combines differential remote sensing, 24V input rating, and EXTVCC bypass in a single monolithic 15A solution-making it optimal for high-accuracy, high-input-voltage, thermally constrained point-of-load designs where analog simplicity and precision are prioritized.
Availability
LTC3613IWKH#PBF is available at Aetrix Electronics and suitable for server power delivery, FPGA core supplies, and industrial PLC CPU modules requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LTC3613IWKH#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 acquired Linear Technology in 2017 and maintains its high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3613IWKH#PBF belongs to Linear's monolithic high-current buck regulator family, engineered for demanding point-of-load applications where precision regulation, fast transient response, and thermal efficiency are critical in space-constrained systems.
FAQ
What is the guaranteed operating temperature range for the LTC3613IWKH#PBF?
The LTC3613IWKH#PBF is specified and guaranteed over the full –40°C to +125°C junction temperature range. This industrial-grade rating is validated through design, characterization, and statistical process control-not just assured by correlation-and applies to all electrical parameters listed in the datasheet under those conditions.
How does differential output sensing work on the LTC3613IWKH#PBF, and what is its practical benefit?
The LTC3613IWKH#PBF uses VOSNS+ and VOSNS– pins to measure the voltage across the external feedback resistor divider placed directly at the load. This rejects common-mode ground noise up to ±500mV between local controller ground and remote load ground, ensuring ±0.67% output regulation even with significant PCB ground plane impedance.
Can the LTC3613IWKH#PBF operate with an input voltage below 4.5V?
No-the absolute minimum input voltage for normal operation of the LTC3613IWKH#PBF is 4.5V as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Operation below this violates the guaranteed specification and may result in failure to regulate or undervoltage lockout activation.
What is the purpose of the EXTVCC pin on the LTC3613IWKH#PBF, and how does it improve efficiency?
The EXTVCC pin on the LTC3613IWKH#PBF allows bypassing the internal 5.3V LDO when supplied with ≥4.6V. This shuts down the LDO and connects EXTVCC directly to INTVCC, eliminating LDO power dissipation and reducing self-heating-particularly beneficial in high-current, high-input-voltage applications where LDO losses would otherwise degrade overall efficiency.
Does the LTC3613IWKH#PBF support parallel operation for higher current, and if so, how is current sharing achieved?
Yes-the LTC3613IWKH#PBF supports paralleling via its controlled on-time valley current mode architecture. When multiple LTC3613IWKH#PBF units share the same RT resistor and synchronized MODE/PLLIN clock, their switching cycles align and valley current thresholds track closely, enabling natural current sharing without external current-balancing circuitry.
LTC3613IWKH#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)
LTC3613IWKH#PBF FAQ
1.How can I place an order for LTC3613IWKH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3613IWKH#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 LTC3613IWKH#PBF reliable?
The price and inventory of LTC3613IWKH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3613IWKH#PBF is usually 5 days.
3.What payment methods are accepted for LTC3613IWKH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3613IWKH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3613IWKH#PBF?
LTC3613IWKH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3613IWKH#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 LTC3613IWKH#PBF?
For technical support, including LTC3613IWKH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3613IWKH#PBF requirements.
6.How does Aetrix verify that LTC3613IWKH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3613IWKH#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 LTC3613IWKH#PBF meets industry standards.
7.What is the process for return or replacement of LTC3613IWKH#PBF?
All LTC3613IWKH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3613IWKH#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 LTC3613IWKH#PBF part is unused and in its original packaging.
Return procedure for LTC3613IWKH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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