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Analog Devices Inc. LTC3614IUDD#PBF
- Part No.:
- LTC3614IUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614IUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:632
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Product details
Overview
LTC3614IUDD#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 0.6V minimum output voltage. It delivers high efficiency up to 95% in portable computer systems and DDR memory termination applications.
For engineers reviewing the LTC3614IUDD#PBF datasheet, LTC3614IUDD#PBF pinout, LTC3614IUDD#PBF application, or LTC3614IUDD#PBF equivalent, key selection criteria include programmable switching frequency up to 4MHz, selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal AVP support, and thermal performance in the 3mm × 5mm QFN package.
Technical Context
The LTC3614IUDD#PBF implements constant-frequency current-mode control with an internal 2.25MHz oscillator (configurable via RT/SYNC resistor or external clock up to 4MHz). Its dual-MOSFET synchronous architecture eliminates the need for an external catch diode and supports 100% duty cycle for low-dropout operation.
It features three distinct operating modes selected via the MODE pin: Burst Mode (75µA no-load IQ), Pulse-Skipping, and Forced Continuous (reducing EMI). Compensation is adjustable via the ITH pin, enabling transient optimization across wide load and capacitor ranges, and includes active voltage positioning (AVP) when ITH is tied to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports point-of-load regulation for processors and DDR memory rails |
| Input Voltage Range | 2.25V to 5.5V - compatible with single Li-Ion and fixed low-voltage supplies |
| Switching Frequency | Up to 4MHz - enables use of compact 330nH inductors and reduces board area |
| Quiescent Current | 75µA in Burst Mode - extends battery life in handheld devices during light-load standby |
| Output Accuracy | ±1% over temperature - ensures stable core voltage for sensitive digital loads |
| Min Output Voltage | 0.6V - supports modern low-voltage logic and DDR termination requirements |
| Duty Cycle | 100% - maintains regulation down to VIN ≈ VOUT, critical for battery discharge end-of-life |
Pinout & Package
The LTC3614IUDD#PBF is housed in a thermally enhanced 24-pin 3mm × 5mm QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR mode; resistor-to-GND adjusts slew rate; open = min slew |
| RT/SYNC (2) | Oscillator timing & sync interface | Resistor sets fSW (300kHz–4MHz); external clock synchronizes switching; tied to SVIN = 2.25MHz |
| SGND (3) | Signal reference ground | Reference for feedback, compensation, and small-signal circuitry; must tie to PGND at single point |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent of SVIN; powers P-channel top switch; multiple pins reduce IR drop |
| SW (5,6,7,8,13,14,15,16) | Switch node connection | Connects to inductor; eight parallel pins minimize inductance and thermal resistance |
| RUN (19) | Enable/shutdown control | Low = shutdown (<1µA IQ); high = normal operation; supports sequencing |
| PGOOD (20) | Open-drain power status flag | Pulled low if VFB outside ±7.5% window; blanked for 70–140µs during transitions |
| MODE (21) | Operating mode selector | SGND = Burst Mode; SVIN = Pulse-Skipping; 1.1V–0.58×SVIN = Forced Continuous |
| VFB (22) | Feedback voltage sense | Monitors resistive divider; internal 0.6V reference enables precise output regulation |
| ITH (23) | Error amplifier output & compensation | Controls peak inductor current; tied to SVIN enables internal AVP and compensation |
| TRACK/SS (24) | Soft-start / tracking / reference input | Capacitor-to-GND sets soft-start time; can track another supply or serve as ext. ref |
| PGND (25) | Power ground return | Exposed pad; connects to N-channel bottom switch source; must be soldered to PCB thermal plane |
Key Features
| Feature | Design Value |
|---|---|
| Programmable slew rate on SW node | Reduces EMI and switching noise via SRLIM/DDR pin resistor adjustment |
| Selectable operating modes | Burst Mode (75µA IQ), Pulse-Skipping, or Forced Continuous - balances efficiency vs. noise |
| Internal AVP with adjustable compensation | ITH tied to SVIN enables active voltage positioning for DDR memory compliance |
| 100% duty cycle capability | Extends usable battery life by maintaining regulation as input drops near output voltage |
| DDR memory termination support | SRLIM/DDR pin = SVIN configures IOUT = ±3A sink/source capability for DDR2/3 VTT rails |
Applications
| Point-of-Load Supplies | Distributed Power Supplies |
|---|---|
Use Scenario: Regulating core voltage for FPGA or ASIC in space-constrained embedded systems. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 0.85V–1.2V at up to 4A. Use Value: High efficiency (>92% at 2A) and 4MHz operation enable compact 3mm × 5mm layout with minimal output capacitance. | Use Scenario: Providing isolated, sequenced rails in multi-board industrial controllers. IC Role / Device Role / Timing Role: Secondary DC/DC stage converting intermediate 5V/3.3V bus to load-specific voltages. Use Value: TRACK/SS pin enables precise power-up sequencing with upstream converters; RUN pin supports system-level enable control. |
| Portable Computer Systems | DDR Memory Termination |
Use Scenario: Powering CPU I/O or GPU memory interfaces in ultrabooks and tablets. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from single-cell Li-Ion (2.7V–4.2V). Use Value: 75µA Burst Mode IQ and 100% duty cycle extend runtime during display sleep and background tasks. | Use Scenario: Generating matched ±3A VTT termination for DDR3/DDR4 memory subsystems. IC Role / Device Role / Timing Role: Bidirectional buck-boost regulator configured in DDR mode via SRLIM/DDR = SVIN. Use Value: Integrated ±3A sink/source capability eliminates need for discrete current sources/sinks and external op-amps. |
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 fSW, 2.95–16V input, integrated FETs, but no DDR mode or AVP | Targeted at higher-input industrial/motor drives; lacks DDR sink capability and low-IQ Burst Mode | Choose for wider VIN range and higher ambient temp rating; avoid for DDR VTT or battery-powered designs |
| MP2315GJ-Z | 4A, 2MHz max fSW, 4.5–26V input, no programmable modes, no DDR support, 300µA IQ | Cost-optimized for fixed 5V/12V inputs; unsuitable for Li-Ion or precision DDR termination | Prefer for non-battery, non-DDR applications where size and ultra-low IQ are secondary |
Compared with TPS544B20RHLT and MP2315GJ-Z, the LTC3614IUDD#PBF uniquely combines sub-100µA light-load IQ, 4MHz programmability, DDR bidirectional operation, and AVP-making it optimal for portable and memory-intensive designs where efficiency, noise control, and rail matching are critical.
Availability
LTC3614IUDD#PBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3614IUDD#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 portfolio.
The LTC3614IUDD#PBF belongs to Linear's monolithic synchronous buck regulator family, engineered for high-efficiency, low-noise, and thermally robust point-of-load conversion in battery-powered and memory-critical applications.
FAQ
What is the maximum switching frequency supported by the LTC3614IUDD#PBF?
The LTC3614IUDD#PBF supports a maximum switching frequency of 4MHz, achievable either by applying an external clock signal to the RT/SYNC pin or by selecting an appropriate RT resistor value. At 4MHz, the device enables use of very small surface-mount inductors (e.g., 330nH), reducing solution size and cost while maintaining high efficiency across its 4A output range.
How does the LTC3614IUDD#PBF achieve 75µA quiescent current in Burst Mode?
The LTC3614IUDD#PBF achieves 75µA quiescent current in Burst Mode by dynamically disabling internal circuitry-including gate drivers and bias networks-during idle intervals between switching bursts. This deep sleep state minimizes static current draw while maintaining output regulation via energy stored in output capacitors, making it ideal for battery-powered applications requiring extended standby time.
Can the LTC3614IUDD#PBF be used for DDR memory VTT termination?
Yes, the LTC3614IUDD#PBF supports DDR memory termination by configuring the SRLIM/DDR pin to SVIN, enabling DDR mode with ±3A sink/source capability. In this mode, it regulates VTT to half the supply voltage with tight tracking, meeting JEDEC specifications for DDR2/DDR3 without external current sources or op-amps-reducing BOM count and layout complexity.
What thermal considerations apply to the LTC3614IUDD#PBF's exposed PGND pad?
The LTC3614IUDD#PBF's exposed PGND pad (Pin 25) must be soldered to a dedicated PCB thermal plane to ensure reliable operation at full 4A load. With θJA = 38°C/W, inadequate pad soldering or insufficient copper area can cause junction temperatures to exceed 150°C under sustained load, triggering thermal shutdown. Designers must follow Linear's recommended land pattern and reflow profile for optimal thermal performance.
Does the LTC3614IUDD#PBF support output voltage tracking during power-up?
Yes, the LTC3614IUDD#PBF supports precise output voltage tracking using the TRACK/SS pin. When driven by an external voltage ramp (e.g., from another regulator's output), the LTC3614IUDD#PBF's output follows that ramp with minimal offset, enabling controlled sequencing in multi-rail systems. This avoids voltage reversal or latch-up in FPGAs and processors requiring strict power-up order.
LTC3614IUDD#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)
LTC3614IUDD#PBF FAQ
1.How can I place an order for LTC3614IUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614IUDD#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 LTC3614IUDD#PBF reliable?
The price and inventory of LTC3614IUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614IUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3614IUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614IUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614IUDD#PBF?
LTC3614IUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614IUDD#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 LTC3614IUDD#PBF?
For technical support, including LTC3614IUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614IUDD#PBF requirements.
6.How does Aetrix verify that LTC3614IUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3614IUDD#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 LTC3614IUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3614IUDD#PBF?
All LTC3614IUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614IUDD#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 LTC3614IUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3614IUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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