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Analog Devices Inc. LTC3608IWKG#TRPBF
- Part No.:
- LTC3608IWKG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 52-VFQFN Exposed Pad
- Datasheet:
-
LTC3608IWKG#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 8A 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,673
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Product details
Overview
LTC3608IWKG#TRPBF from Analog Devices (formerly Linear Technology) is an 8A monolithic synchronous step-down DC/DC converter with valley current mode control, operating from 4V to 18V input and delivering 2.5V output. It features programmable on-time (tON(MIN) ≤ 100 ns), ±1% 0.6V reference, and power-good monitoring - used in point-of-load regulation for FPGA, ASIC, and DSP core supplies.
For engineers reviewing the LTC3608IWKG#TRPBF datasheet, LTC3608IWKG#TRPBF pinout, LTC3608IWKG#TRPBF application, or LTC3608IWKG#TRPBF equivalent, key selection criteria include its 52-lead 7mm × 8mm QFN package, adjustable current limit via VRNG pin, forced continuous/discontinuous mode control via FCB, and EXTVCC switchover capability for improved efficiency in multi-rail systems.
Technical Context
The LTC3608IWKG#TRPBF implements a constant on-time, valley current-mode architecture with internal N-channel MOSFETs (RDS(ON) = 10 mΩ top / 8 mΩ bottom), enabling stable operation with ceramic output capacitors and fast transient response. Its ITH pin serves dual roles: error amplifier compensation node and valley current threshold control point.
Frequency is set implicitly by ION pin current and VON pin voltage (tON = VVON/IION × 10 pF), allowing near-constant switching frequency across input and load variations. Overvoltage protection triggers at ±10% VFB, and foldback current limiting reduces valley current to ~1/6 of maximum under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A max continuous - supports high-current digital loads without external MOSFETs. |
| Input Voltage Range | 4V to 18V - compatible with 5V, 12V, and industrial 15V rails; absolute max 20V. |
| Output Voltage Accuracy | ±1% over –40°C to 125°C - enables precise core voltage regulation for processors. |
| Minimum On-Time | 60–100 ns - allows high step-down ratios (e.g., 12V→2.5V) at high frequency without dropout. |
| Switching Frequency | Adjustable via RON (e.g., ~550 kHz at VIN=12V, VOUT=2.5V) - balances efficiency vs. size tradeoffs. |
| Current Limit Range | Programmable 5–16A via VRNG pin (0.5V–0.7V) - enables safe derating for thermal management. |
| Shutdown Quiescent Current | 15 µA - minimizes system standby power loss in always-on applications. |
Pinout & Package
Package: 52-lead 7mm × 8mm QFN with exposed thermal pad (WKG); RoHS-compliant, lead-free, tape-and-reel (TRPBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVIN (1–7, 48–53) | Main input supply connection | Multiple parallel pins reduce IR drop and thermal resistance for 8A input current path. |
| SW (8, 33, 41–47, 55) | Switch node | High dv/dt node connecting to inductor; multiple pins minimize parasitic inductance in high-frequency switching. |
| PGND (34–40) | Power ground return | Dedicated low-impedance path for high di/dt currents; must be connected directly to CIN(–) and L1(–). |
| ITH (18) | Error amplifier output / current threshold | Analog control voltage (0–2.4V) setting valley current limit; also used for loop compensation. |
| VRNG (17) | Valley current limit range select | 0.5V–0.7V input scales maximum valley current from 5A to 16A - critical for thermal design margining. |
| FCB (19) | Forced continuous mode control | GND = forced continuous (low-noise); INTVCC = discontinuous (high-efficiency light load); resistive divider = secondary-sensing mode. |
| PGOOD (16) | Open-drain power-good monitor | Asserts low when VFB deviates >±10% - used for sequencing, fault reporting, and system enable logic. |
Key Features
| Feature | Design Value |
|---|---|
| True valley current mode control | Enables stable ceramic-capacitor operation and eliminates subharmonic oscillation without slope compensation. |
| Programmable soft-start | External capacitor on RUN/SS pin sets ramp time (~3 s/µF) - prevents inrush current and enables controlled power-up sequencing. |
| EXTVCC switchover | Auto-switches gate drive supply from INTVCC to external 4.7–7V source - improves efficiency by reducing internal LDO losses. |
| Adjustable minimum on-time | Configurable via ION/VON pins - maintains regulation down to ~2.5V output from 12V input at 500+ kHz. |
| Integrated overvoltage protection | Shuts off top MOSFET and latches bottom MOSFET on during VOUT >110% - protects downstream logic from rail faults. |
Applications
| FPGA Core Supply | Industrial PLC CPU Rail |
|---|---|
Use Scenario: Powering Xilinx Kintex-7 or Intel Arria 10 FPGA core at 0.85–1.2V with dynamic load steps up to 6A. IC Role / Device Role / Timing Role: Primary point-of-load regulator with fast transient response (<20 µs recovery) and tight voltage accuracy. Use Value: Maintains <±1% regulation during 0→8A load steps at 200 kHz, preventing timing violations and logic errors. |
Use Scenario: Generating 2.5V/5V rails for ARM Cortex-A9-based PLC controllers in harsh 40–85°C ambient environments. IC Role / Device Role / Timing Role: High-reliability buck converter with extended temperature grade (–40°C to 125°C junction) and latch-off fault protection. Use Value: Sustains 8A output with <15°C rise above ambient using standard 2-layer PCB, eliminating need for heatsinks. |
| Telecom Baseband Processor | Automotive ADAS Domain Controller |
Use Scenario: Supplying 1.8V/3.3V to LTE baseband SoCs (e.g., Qualcomm FSM9955) requiring low EMI and high PSRR. IC Role / Device Role / Timing Role: Low-noise synchronous buck with forced continuous mode (FCB = GND) and optimized layout for EMI reduction. Use Value: Achieves <10 mVpp output ripple at 550 kHz while meeting CISPR-22 Class B radiated emissions limits. |
Use Scenario: Powering NVIDIA Orin-based ADAS domain controllers in automotive infotainment and vision processing modules. IC Role / Device Role / Timing Role: AEC-Q200–capable (via I-grade qualification) buck regulator with PGOOD sequencing and short-circuit shutdown timer. Use Value: Supports ASIL-B functional safety requirements through output overvoltage lockout and thermal foldback current limiting. |
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 |
|---|---|---|---|
| MP8770GQ-Z (Monolithic Power) | 6A rated, 2.5–18V input, fixed 500kHz fSW, no VRNG or FCB pins | Lacks programmable current limit and forced continuous mode - less flexible for thermal derating or noise-sensitive designs | Choose MP8770GQ-Z only if 6A output suffices and fixed frequency simplifies EMI filtering. |
| TPS548D22 (Texas Instruments) | 8A, 4.5–18V input, D-CAP3 control, integrated MOSFETs, 0.5% ref accuracy | Higher precision reference but no EXTVCC switchover or valley current mode - less optimal for ultra-low dropout or multi-rail efficiency optimization | Prefer TPS548D22 when ±0.5% output accuracy is mandatory and board space permits larger package (6×6mm QFN). |
Compared with MP8770GQ-Z and TPS548D22, the LTC3608IWKG#TRPBF uniquely combines 8A capability with valley current mode, VRNG-programmable current limit, and EXTVCC switchover - making it optimal for thermally constrained, multi-rail, or high-transient industrial and telecom point-of-load designs.
Availability
LTC3608IWKG#TRPBF is available at Aetrix Electronics and suitable for FPGA core supplies, industrial PLC CPU rails, and telecom baseband processor power delivery requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3608IWKG#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 full product support, including datasheets, SPICE models, and application notes for legacy Linear parts like the LTC3608 series.
The LTC3608 belongs to Linear's high-current monolithic buck converter family, designed specifically for demanding point-of-load applications in computing, telecom, and industrial systems where efficiency, thermal performance, and transient response are critical.
FAQ
What is the maximum junction temperature rating for the LTC3608IWKG#TRPBF?
The LTC3608IWKG#TRPBF is specified for operation from –40°C to 125°C junction temperature. Its WKG package has θJA = 29°C/W (simulated per JESD51-7), and thermal design must ensure TJ does not exceed 125°C under worst-case load, ambient, and airflow conditions. The I-grade part is fully tested across this range.
How do I configure the LTC3608IWKG#TRPBF for forced continuous conduction mode?
To enable forced continuous conduction mode on the LTC3608IWKG#TRPBF, tie the FCB pin (Pin 19) to ground. This disables discontinuous mode operation at light loads, reducing output voltage ripple and EMI - ideal for noise-sensitive analog or RF subsystems powered from the same rail.
Can the LTC3608IWKG#TRPBF operate with a 3.3V input supply?
No - the LTC3608IWKG#TRPBF has a minimum input voltage of 4V per its Absolute Maximum Ratings and Electrical Characteristics tables. Attempting operation below 4V will trigger undervoltage lockout (VIN(UVLO) = 3.4V typical), preventing startup and regulation. Use a different converter (e.g., LTC3638) for sub-4V inputs.
What is the purpose of the VRNG pin on the LTC3608IWKG#TRPBF?
The VRNG pin (Pin 17) on the LTC3608IWKG#TRPBF sets the maximum valley current limit by accepting a 0.5V–0.7V input. This directly scales the peak inductor current and thus the maximum sustainable output current (e.g., 0.5V → ~5A, 0.7V → ~16A), enabling precise thermal and reliability margining in final system design.
Does the LTC3608IWKG#TRPBF support output voltages below 0.6V?
No - the LTC3608IWKG#TRPBF uses an internal 0.6V feedback reference. Output voltage is set by VOUT = 0.6V × (1 + R2/R1), so the lowest achievable regulated output is 0.6V (with R2 = 0). For sub-0.6V outputs, a different controller with adjustable reference or external reference injection is required.
LTC3608IWKG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-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):
- 4V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 17.82V
- Current - Output:
- 8A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN-Multipad (7x8)
LTC3608IWKG#TRPBF FAQ
1.How can I place an order for LTC3608IWKG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3608IWKG#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 LTC3608IWKG#TRPBF reliable?
The price and inventory of LTC3608IWKG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3608IWKG#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3608IWKG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3608IWKG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3608IWKG#TRPBF?
LTC3608IWKG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3608IWKG#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 LTC3608IWKG#TRPBF?
For technical support, including LTC3608IWKG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3608IWKG#TRPBF requirements.
6.How does Aetrix verify that LTC3608IWKG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3608IWKG#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 LTC3608IWKG#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3608IWKG#TRPBF?
All LTC3608IWKG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3608IWKG#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 LTC3608IWKG#TRPBF part is unused and in its original packaging.
Return procedure for LTC3608IWKG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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