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Analog Devices Inc. LTC3614EUDD#TRPBF
- Part No.:
- LTC3614EUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614EUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,839
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Product details
Overview
LTC3614EUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 4A, 4MHz monolithic synchronous step-down DC/DC converter with current-mode control, 2.25V–5.5V input range, ±1% output voltage accuracy, and 0.6V minimum adjustable output. It delivers high efficiency up to 95% in portable computing and DDR memory termination applications.
For engineers reviewing the LTC3614EUDD#TRPBF datasheet, LTC3614EUDD#TRPBF pinout, LTC3614EUDD#TRPBF application, or LTC3614EUDD#TRPBF equivalent, key selection criteria include programmable switching frequency up to 4MHz, selectable Burst Mode®/pulse-skipping/forced continuous operation, internal AVP support, 100% duty cycle capability for low-dropout battery operation, and thermal performance in the 3mm × 5mm QFN package.
Technical Context
The LTC3614EUDD#TRPBF implements constant-frequency current-mode control with external RT/SYNC programmability (300kHz–4MHz) or synchronization to an external clock. Its dual-MOSFET synchronous architecture eliminates the need for an external catch diode and enables bidirectional current flow for DDR sink capability.
It supports four operating modes via the MODE pin: Burst Mode® (75µA IQ), pulse-skipping, forced continuous (reduced EMI), and external-clamp Burst Mode. Internal compensation and Active Voltage Positioning (AVP) are enabled by tying ITH to SVIN, while TRACK/SS provides start-up tracking, soft-start, or external reference functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous; supports ±3A DDR sinking for memory termination compliance. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion and fixed low-voltage rails. |
| Quiescent Current | 75µA in Burst Mode® sleep; drops to <1µA in shutdown-extends battery life. |
| Switching Frequency | Programmable up to 4MHz; enables use of sub-1µH inductors and compact layouts. |
| Output Accuracy | ±1% over temperature and line/load; ensures stable regulation for precision loads like DDR VTT. |
| Duty Cycle | 100% capability; maintains regulation down to VIN ≈ VOUT + RDS(ON) × IOUT. |
| Package | 24-pin 3mm × 5mm thermally enhanced QFN; exposed PGND pad for low θJA (38°C/W). |
Pinout & Package
The LTC3614EUDD#TRPBF is housed in a leadless 24-pin 3mm × 5mm plastic QFN (UDD package) with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew control | Tied to SVIN enables DDR mode; resistor-to-GND adjusts slew rate; open = min slew. |
| RT/SYNC (2) | Oscillator interface | Resistor sets fSW (300kHz–4MHz); external clock syncs up to 4MHz; tied to SVIN = 2.25MHz default. |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and small-signal circuitry; must connect to PGND at single point. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent of SVIN; powers P-channel top switch; may be lower than SVIN to reduce gate drive loss. |
| SW (5,6,7,8,13,14,15,16) | Switch node | Connects to inductor; multiple pins reduce parasitic inductance and improve thermal spreading. |
| RUN (19) | Enable control | Pull low to enter shutdown (<1µA IQ); high = active; no internal pull-up. |
| PGOOD (20) | Power status indicator | Open-drain output; asserts low if VFB deviates >±7.5% or during tracking/startup. |
| MODE (21) | Operating mode selector | Voltage-controlled: SGND = Burst Mode®, SVIN = pulse-skipping, 1.1V–0.58×SVIN = forced continuous. |
| VFB (22) | Feedback input | Monitors resistive divider; internal 0.6V reference enables outputs down to 0.6V. |
| ITH (23) | Error amplifier output | Controls peak inductor current; tie to SVIN for internal compensation and AVP. |
| TRACK/SS (24) | Soft-start/tracking/reference | Capacitor-to-GND sets soft-start time; resistor-to-SVIN enables tracking; also accepts external reference. |
| PGND (25) | Power ground | Exposed pad; connects to N-channel bottom switch source; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable switching frequency | 300kHz–4MHz via RT/SYNC resistor or external clock-optimizes size vs. efficiency trade-off. |
| Three selectable operating modes | Burst Mode® (75µA IQ), pulse-skipping, and forced continuous-enables noise-sensitive or high-precision designs. |
| Internal AVP and compensation | Enabled by tying ITH to SVIN-eliminates external compensation components and simplifies DDR VTT design. |
| 100% duty cycle operation | Maintains regulation at ultra-low VIN–VOUT differentials-critical for Li-Ion battery end-of-discharge runtime. |
| DDR memory termination support | ±3A sink/source capability with SRLIM/DDR pin configuration-meets JEDEC DDR3/DDR4 VTT requirements. |
Applications
| Point-of-Load Regulation | Distributed Power Supplies |
|---|---|
Use Scenario: Regulating 1.2V/1.8V core voltage for FPGA or ASIC in space-constrained industrial controller. IC Role / Device Role / Timing Role: Primary buck regulator delivering 4A with fast transient response and tight DC accuracy. Use Value: 95% peak efficiency and 75µA quiescent current extend system uptime in battery-backed deployments. | Use Scenario: Providing isolated 3.3V rail from a 12V intermediate bus in telecom base station power architecture. IC Role / Device Role / Timing Role: Secondary-side synchronous buck converter with programmable fSW for EMI filtering coordination. Use Value: 4MHz max switching frequency allows <1µH inductors, reducing board area and enabling dense multi-rail designs. |
| Portable Computer Systems | DDR Memory Termination |
Use Scenario: Powering CPU I/O or GPU memory interface in ultrabook with dynamic load steps from 100mA to 4A. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck with forced continuous mode to suppress switching noise in RF-sensitive zones. Use Value: Programmable slew rate on SW node and selectable modes minimize conducted EMI without sacrificing light-load efficiency. | Use Scenario: Generating matched ±3A VTT termination for DDR4 memory subsystem in server DIMM module. IC Role / Device Role / Timing Role: Bidirectional buck-boost capable regulator configured in DDR mode with tracking control. Use Value: Internal AVP and precise ±1% output accuracy ensure JEDEC-compliant VTT tracking across temperature and load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RQFT | 4A, 1.5MHz max fSW, 2.95–16V input, integrated FETs, but no DDR sink mode or Burst Mode® IQ <100µA. | Targeted at higher-input industrial rails; lacks low-IQ sleep mode and DDR-specific features. | Choose for wide-input systems where 2.25V start-up and sub-100µA IQ are not required. |
| MP2315GJ-Z | 4A, 2MHz max fSW, 4.5–26V input, no programmable modes, no DDR support, 300µA typical IQ. | Cost-optimized for fixed 5V/12V inputs; no tracking, AVP, or low-noise forced continuous option. | Choose for non-battery, non-DDR applications where minimal BOM count outweighs feature set. |
Compared with TPS544B20RQFT and MP2315GJ-Z, the LTC3614EUDD#TRPBF uniquely combines ultra-low 75µA sleep current, 4MHz programmability, DDR sink capability, and internal AVP-making it optimal for portable, memory-intensive, and battery-critical designs where efficiency, noise control, and precision tracking are mandatory.
Availability
LTC3614EUDD#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, portable computer systems, and distributed power supplies requiring stable component supply across industrial and embedded production cycles.
Supply support for LTC3614EUDD#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 LTC3614EUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, engineered for high-efficiency, low-noise, and feature-rich DC/DC conversion in battery-powered and memory-interface applications.
FAQ
What is the maximum switching frequency supported by the LTC3614EUDD#TRPBF?
The LTC3614EUDD#TRPBF supports a maximum switching frequency of 4MHz, achievable either by configuring the RT/SYNC pin with an appropriate resistor or by synchronizing to an external clock signal up to 4MHz. This high-frequency capability enables the use of compact 330nH inductors and reduces output capacitance requirements, making it ideal for space-constrained portable designs. The default internal oscillator runs at 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3614EUDD#TRPBF support DDR memory termination with sink current capability?
Yes, the LTC3614EUDD#TRPBF supports DDR memory termination with true bidirectional current handling. When the SRLIM/DDR pin is tied to SVIN, the device enters DDR mode and delivers ±3A output current-sourcing up to 4A and sinking up to 3A-meeting JEDEC specifications for DDR3/DDR4 VTT rails. This is enabled by its synchronous N-channel bottom switch and dedicated current-limit architecture.
How does the Burst Mode® operation of the LTC3614EUDD#TRPBF reduce quiescent current?
The LTC3614EUDD#TRPBF achieves 75µA quiescent current in Burst Mode® by intermittently disabling switching and powering down internal circuits during light-load intervals. When the average inductor current falls below the load demand, the ITH voltage drops below an internal clamp, triggering sleep mode. Both power switches remain off while the output capacitor supplies load current until VOUT droop re-enables regulation-minimizing switching and gate-drive losses without compromising regulation accuracy.
What thermal considerations apply to the LTC3614EUDD#TRPBF's 3mm × 5mm QFN package?
The LTC3614EUDD#TRPBF uses a thermally enhanced 24-pin QFN (UDD) package with θJA = 38°C/W. Its exposed PGND pad (Pin 25) must be soldered to a minimum 200mm² PCB copper area for effective heat dissipation. At 4A load and 5V input, thermal derating begins above 85°C ambient unless adequate copper and airflow are provided. Junction temperature must stay ≤150°C; operation above 125°C reduces lifetime reliability per Analog Devices' characterization data.
Can the LTC3614EUDD#TRPBF operate with input voltages as low as 2.25V while maintaining regulation?
Yes, the LTC3614EUDD#TRPBF operates from 2.25V to 5.5V input and supports 100% duty cycle operation, allowing regulation even when VIN approaches VOUT. At low input voltages, RDS(ON) of both internal MOSFETs increases-requiring careful thermal analysis-but the device maintains ±1% output accuracy and stable current-mode control. This makes the LTC3614EUDD#TRPBF especially suited for single-cell Li-Ion systems down to 2.5V cutoff.
LTC3614EUDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 2.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (3x5)
LTC3614EUDD#TRPBF FAQ
1.How can I place an order for LTC3614EUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614EUDD#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 LTC3614EUDD#TRPBF reliable?
The price and inventory of LTC3614EUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614EUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3614EUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614EUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614EUDD#TRPBF?
LTC3614EUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614EUDD#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 LTC3614EUDD#TRPBF?
For technical support, including LTC3614EUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614EUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3614EUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3614EUDD#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 LTC3614EUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3614EUDD#TRPBF?
All LTC3614EUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614EUDD#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 LTC3614EUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3614EUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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