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Analog Devices Inc. LTC3614HUDD#PBF
- Part No.:
- LTC3614HUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614HUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:869
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Product details
Overview
LTC3614HUDD#PBF 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 100% duty cycle low-dropout operation. It delivers point-of-load power to DDR memory termination, portable computing rails, and handheld device core supplies.
For engineers reviewing the LTC3614HUDD#PBF datasheet, LTC3614HUDD#PBF pinout, LTC3614HUDD#PBF application, or LTC3614HUDD#PBF equivalent, key selection criteria include its programmable 300kHz–4MHz switching frequency, selectable Burst Mode®/pulse-skipping/forced continuous operation, internal AVP support, 75µA sleep-mode quiescent current, and thermally enhanced 24-pin 3mm × 5mm QFN package rated for –40°C to 150°C junction temperature.
Technical Context
The LTC3614HUDD#PBF employs constant-frequency current-mode architecture with external RT/SYNC pin control, supporting resistor-programmed, externally synchronized (up to 4MHz), or internal 2.25MHz oscillator operation. Its dual MOSFET power stage features 35mΩ P-channel top switch and 25mΩ N-channel bottom switch, enabling high-efficiency regulation down to 0.6V output with active voltage positioning (AVP) when ITH is tied to SVIN.
Pin-strapped MODE selection enables four distinct operating modes: Burst Mode® (with internal or external clamp), pulse-skipping, or forced continuous-each altering transient response, light-load efficiency, and EMI profile. The SRLIM/DDR pin configures slew rate limiting or DDR memory mode (±3A sourcing/sinking), while TRACK/SS supports soft-start, tracking, or external reference functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous; supports ±3A DDR termination with bidirectional current capability. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion battery and fixed low-voltage rails. |
| Output Voltage Accuracy | ±1% over temperature; ensures stable regulation for sensitive digital loads like DDR memory. |
| Quiescent Current | 75µA in Burst Mode® sleep; extends battery life in always-on portable systems. |
| Switching Frequency | Programmable up to 4MHz; enables use of compact 330nH inductors and reduces board area. |
| Duty Cycle | 100% dropout operation; maintains regulation as input voltage approaches output level. |
| Junction Temp Range | –40°C to 150°C; qualified for high-reliability industrial and automotive under-hood applications. |
Pinout & Package
Package: 24-pin, 3mm × 5mm thermally enhanced QFN (UDD) with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew control | Tied to SVIN enables DDR mode (±3A); grounded sets max slew rate; resistor-to-GND adjusts slew continuously. |
| RT/SYNC (2) | Oscillator control | Resistor-to-GND sets frequency (300kHz–4MHz); external clock sync up to 4MHz; tied to SVIN selects 2.25MHz internal oscillator. |
| SGND (3) | Signal ground reference | Reference for feedback, compensation, and small-signal circuitry; must connect to PGND at single point. |
| PVIN (4,10,11,17) | Main power input | Connects to source of internal P-MOSFET; may be lower than SVIN for optimized efficiency. |
| SW (5,6,7,8,13,14,15,16) | Switch node | Drain connection for both internal MOSFETs; ties to inductor; multiple pins reduce parasitic inductance. |
| RUN (19) | Enable control | Logic-high enables regulator; pulled low disables IC with <1µA shutdown current. |
| PGOOD (20) | Power status indicator | Open-drain output asserts high after VFB stabilizes within ±7.5% window for >100µs; pulls low during fault or startup. |
| MODE (21) | Operating mode selector | Voltage levels select Burst Mode® (0–0.3V), pulse-skipping (SVIN), forced continuous (1.1V–0.58×SVIN), or external-clamp Burst (0.45–0.8V). |
| VFB (22) | Feedback input | Monitors resistive divider output; compares to 0.6V internal reference for regulation. |
| ITH (23) | Error amplifier output | Controls peak inductor current; tied to SVIN enables internal compensation and AVP. |
| TRACK/SS (24) | Soft-start/tracking/reference | Capacitor-to-GND sets soft-start time; resistor-to-SVIN enables external timing; used for supply tracking or external reference. |
| PGND (25) | Power ground | Exposed pad connects to source of internal N-MOSFET; mandatory PCB soldering for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable switching frequency up to 4MHz | Enables miniaturized magnetics and capacitors while maintaining efficiency across wide load range. |
| Selectably configurable operating modes | Burst Mode®, pulse-skipping, or forced continuous mode allows optimization of light-load efficiency vs. EMI/noise requirements. |
| Internal Active Voltage Positioning (AVP) | When ITH tied to SVIN, automatically lowers output voltage under load to compensate for IR drop in power delivery network. |
| Programmable slew rate on SW node | Reduces EMI and voltage overshoot during transients via SRLIM/DDR pin resistor adjustment. |
| DDR memory termination support | SRLIM/DDR = SVIN configures ±3A sourcing/sinking capability with fast transient response for DDR3/DDR4 VTT rails. |
| 100% duty cycle low-dropout operation | Extends runtime in battery-powered systems by sustaining regulation as input voltage decays toward output level. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
|
Use Scenario: Powering FPGA core voltage (e.g., 1.2V @ 3A) in compact embedded systems with strict thermal constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC output with fast transient response. Use Value: 4A capability, 75µA sleep current, and 100% duty cycle extend battery life and maintain regulation during brownout conditions. |
Use Scenario: Providing bidirectional ±3A termination for DDR3/DDR4 memory VTT rail in laptops and servers. IC Role / Device Role / Timing Role: DDR-configured synchronous buck with sourcing/sinking capability and tracking for dynamic VTT compliance. Use Value: SRLIM/DDR = SVIN enables true DDR mode; fast load-step response minimizes VTT droop during memory write cycles. |
| Portable Computer Systems | Handheld Devices |
|
Use Scenario: Generating 1.8V system rail from single-cell Li-Ion (2.8V–4.2V) in ultrabooks with aggressive size and efficiency targets. IC Role / Device Role / Timing Role: High-frequency (up to 4MHz) step-down converter minimizing inductor footprint while maintaining >90% efficiency at 2A. Use Value: 3mm × 5mm QFN package and 330nH inductor compatibility reduce solution size by >30% vs. 1MHz alternatives. |
Use Scenario: Supplying 0.9V processor core voltage in battery-powered medical handhelds requiring ultra-low standby power. IC Role / Device Role / Timing Role: Low-IQ Buck regulator operating in Burst Mode® to achieve 75µA quiescent current at no load. Use Value: Extends shelf life and operational runtime without compromising wake-up responsiveness or regulation accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RHLT | 4A, 2.2MHz max, 2.95–16V input; integrated FETs but wider VIN range; no DDR mode or AVP. | Targets higher-input industrial rails; lacks DDR termination and programmable slew rate. | Choose for 12V input systems where DDR support is unnecessary and higher VIN tolerance is required. |
| MP2315GJ-Z | 3A, 2MHz max, 4.5–28V input; smaller 8-pin SOIC; no MODE pin flexibility or AVP; 300µA IQ. | Cost-sensitive consumer applications; insufficient for 4A DDR or low-IQ portable designs. | Choose only for non-critical 3A loads with >4.5V input and relaxed quiescent current requirements. |
Compared with TPS544B20RHLT and MP2315GJ-Z, the LTC3614HUDD#PBF uniquely combines 4A output, sub-100µA sleep current, DDR mode, AVP, and 4MHz programmability in a thermally robust 3mm × 5mm package-making it optimal for space-constrained, battery-sensitive, and high-performance memory power applications.
Availability
LTC3614HUDD#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply with extended temperature reliability.
Supply support for LTC3614HUDD#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 analog and power management product lines with rigorous qualification standards.
The LTC3614HUDD#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, high-density DC/DC conversion in portable, industrial, and memory-power applications demanding precision regulation and thermal resilience.
FAQ
What is the maximum junction temperature rating for the LTC3614HUDD#PBF?
The LTC3614HUDD#PBF is specified for operation from –40°C to 150°C junction temperature, distinguishing it from the E-grade (–40°C to 125°C) and I-grade (–40°C to 125°C) variants. This H-grade qualification makes the LTC3614HUDD#PBF suitable for high-ambient industrial and automotive under-hood environments where thermal headroom is critical. Derating guidelines apply above 125°C to ensure long-term reliability.
How does the SRLIM/DDR pin configure DDR memory mode on the LTC3614HUDD#PBF?
When the SRLIM/DDR pin is tied to SVIN, the LTC3614HUDD#PBF enters DDR memory mode, enabling ±3A bidirectional current sourcing and sinking capability required for DDR3/DDR4 VTT termination. In this mode, the power good window tracks the TRACK/SS pin voltage, and the slew rate is set to maximum. This configuration is validated in the datasheet's "DDR Memory Mode" section and supported across the full –40°C to 150°C operating range of the LTC3614HUDD#PBF.
Can the LTC3614HUDD#PBF operate with a 2.25V input supply?
Yes, the LTC3614HUDD#PBF supports a minimum input voltage of 2.25V, making it compatible with deeply discharged single-cell Li-Ion batteries. At low input voltages, RDS(ON) of both internal MOSFETs increases, so thermal design must account for higher conduction losses-especially during 100% duty cycle operation. Efficiency curves in the datasheet (Figure G01–G03) confirm stable regulation down to 2.25V across load conditions for the LTC3614HUDD#PBF.
What is the purpose of the TRACK/SS pin on the LTC3614HUDD#PBF?
The TRACK/SS pin on the LTC3614HUDD#PBF serves three functions: internal soft-start (when tied to SVIN), external soft-start timing (via RC network), or supply tracking (to force output ramp-up/down in sync with another rail). It also accepts external reference voltages for custom regulation points. These capabilities are fully supported in the LTC3614HUDD#PBF's –40°C to 150°C temperature grade and documented in the Pin Functions and Applications Information sections of the datasheet.
Does the LTC3614HUDD#PBF support synchronization to an external clock?
Yes, the LTC3614HUDD#PBF supports external clock synchronization up to 4MHz via the RT/SYNC pin. When driven by a clean CMOS clock signal, the internal oscillator locks to the external frequency, and slope compensation automatically adapts to maintain stability. This feature is explicitly specified in the Electrical Characteristics table (fSYNC: 0.3–4MHz) and applies identically to the LTC3614HUDD#PBF across its full operating temperature range.
LTC3614HUDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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):
- 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)
LTC3614HUDD#PBF FAQ
1.How can I place an order for LTC3614HUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614HUDD#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 LTC3614HUDD#PBF reliable?
The price and inventory of LTC3614HUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614HUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3614HUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614HUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614HUDD#PBF?
LTC3614HUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614HUDD#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 LTC3614HUDD#PBF?
For technical support, including LTC3614HUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614HUDD#PBF requirements.
6.How does Aetrix verify that LTC3614HUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3614HUDD#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 LTC3614HUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3614HUDD#PBF?
All LTC3614HUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614HUDD#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 LTC3614HUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3614HUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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