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Analog Devices Inc. LTC3614MPUDD#TRPBF
- Part No.:
- LTC3614MPUDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614MPUDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,201
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Product details
Overview
LTC3614MPUDD#TRPBF from Analog Devices (formerly Linear Technology) is a 4A, 4MHz monolithic synchronous step-down DC/DC converter with ±1% output voltage accuracy, 2.25V–5.5V input range, and 0.6V minimum output voltage. It features Burst Mode® operation (75µA IQ), 100% duty cycle low-dropout capability, and programmable switching frequency up to 4MHz - optimized for point-of-load regulation in battery-powered portable computers and DDR memory termination.
For engineers reviewing the LTC3614MPUDD#TRPBF datasheet, LTC3614MPUDD#TRPBF pinout, LTC3614MPUDD#TRPBF application, or LTC3614MPUDD#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, internal AVP support for DDR applications, forced continuous/pulse-skipping/Burst Mode flexibility, and thermally enhanced 24-pin 3mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3614MPUDD#TRPBF employs constant-frequency current-mode control with adjustable slope compensation and external ITH-based error amplifier compensation. Its dual MOSFET architecture integrates a P-channel high-side switch (35mΩ typical RDS(ON)) and N-channel synchronous rectifier (25mΩ typical RDS(ON)), enabling high efficiency (up to 95%) and eliminating the need for an external catch diode.
It supports three distinct operating modes via the MODE pin: Burst Mode® (75µA IQ), pulse-skipping, and forced continuous mode - the latter essential for bidirectional current handling in DDR termination. The device also provides active voltage positioning (AVP), programmable soft-start via TRACK/SS, and synchronization to external clocks up to 4MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-current point-of-load rails for processors and DDR memory. |
| Input Voltage Range | 2.25V to 5.5V - compatible with single Li-Ion cells and fixed low-voltage supplies. |
| Quiescent Current (Burst Mode) | 75µA - extends battery life in always-on portable systems without compromising regulation. |
| Switching Frequency | Up to 4MHz - enables use of sub-1µH inductors and compact ceramic output capacitors. |
| Output Voltage Accuracy | ±1% over –55°C to 150°C - ensures stable reference for precision analog and memory subsystems. |
| Minimum Output Voltage | 0.6V - supports modern low-voltage core logic and DDR4/DDR5 VDDQ/VTT rails. |
| Thermal Rating | Junction temperature range –55°C to 150°C - qualified for harsh industrial and aerospace environments. |
Pinout & Package
The LTC3614MPUDD#TRPBF is housed in a thermally enhanced 24-pin 3mm × 5mm plastic QFN package (UDD) with an exposed PGND pad (Pin 25) that must be soldered to the PCB for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR termination mode; resistor-to-ground adjusts slew rate for EMI control. |
| RT/SYNC (2) | Oscillator timing & sync interface | Resistor sets frequency (300kHz–4MHz); external clock input synchronizes switching to system clock. |
| SGND (3) | Signal ground reference | Reference for feedback, compensation, and control circuitry - must tie to PGND at single point. |
| PVIN (4,10,11,17) | Power MOSFET source supply | Independent input for high-side switch - may be lower than SVIN to reduce gate drive loss. |
| SW (5,6,7,8,13,14,15,16) | Switch node connection | Eight paralleled pins reduce inductance and power loss at high-frequency, high-current switching. |
| RUN (19) | Enable/shutdown control | Logic-high enables regulation; pulled low disables all circuitry and reduces supply current to <1µA. |
| PGOOD (20) | Open-drain power-good indicator | Asserts after 100µs when VFB stays within ±7.5% window - used for sequencing and fault reporting. |
| MODE (21) | Operating mode selection | Voltage level selects Burst Mode®, pulse-skipping, or forced continuous mode - critical for noise-sensitive or sink-capable apps. |
| VFB (22) | Feedback voltage sensing | Monitors resistive divider output; internal 0.6V reference enables precise output voltage setting. |
| ITH (23) | Error amplifier compensation node | External RC network sets loop dynamics; tied to SVIN enables internal AVP for DDR applications. |
| TRACK/SS (24) | Soft-start & tracking control | Enables internal soft-start (0.65–1.9ms), external capacitor timing, or supply tracking for rail sequencing. |
| PGND (25) | Power ground return | Exposed thermal pad - must be soldered to large copper area for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables ultra-low dropout regulation during battery voltage sag - maintains output down to VIN ≈ VOUT + IR losses. |
| Programmable slew rate on SW node | Reduces EMI emissions and voltage overshoot by limiting dV/dt during switching transitions. |
| Active Voltage Positioning (AVP) | Internal compensation via ITH-to-SVIN connection dynamically lowers output voltage under load - improves DDR memory efficiency. |
| DDR memory termination mode | IOUT = ±3A capability with SRLIM/DDR = SVIN - supports bidirectional current sourcing/sinking for VTT rails. |
| Adjustable Burst Clamp via MODE pin | External voltage (0.45V–0.8V) sets minimum ITH threshold - fine-tunes light-load efficiency vs. ripple trade-off. |
Applications
| Portable Computer Systems | DDR Memory Termination |
|---|---|
Use Scenario: Regulating core voltage for low-power x86 or ARM SoCs in ultrabooks and 2-in-1 devices with dynamic load steps. IC Role / Device Role / Timing Role: Primary point-of-load buck regulator delivering 1.0V/1.2V/1.8V at up to 4A with fast transient response. Use Value: Burst Mode® extends runtime between charges; forced continuous mode suppresses switching noise near RF sections. |
Use Scenario: Providing matched, bidirectional VTT termination for DDR3/DDR4 memory interfaces requiring ±3A sink/source capability. IC Role / Device Role / Timing Role: DDR-specific buck converter operating in SRLIM/DDR = SVIN mode with AVP enabled via ITH-to-SVIN. Use Value: Eliminates external op-amps and discrete FETs; ±1% accuracy ensures JEDEC-compliant VTT tracking. |
| Distributed Power Supplies | Industrial Embedded Controllers |
Use Scenario: Local regulation from 3.3V or 5V backplane rails to multiple 1.2V/1.8V/2.5V subsystems in modular PLCs or I/O cards. IC Role / Device Role / Timing Role: Compact, high-efficiency secondary regulator with programmable frequency to avoid sensitive frequency bands. Use Value: 4MHz operation allows <1µH inductors and small 0603/0805 MLCCs - saves board space in dense layouts. |
Use Scenario: Powering FPGA I/O banks, ADC/DAC references, and real-time MCU cores in factory automation equipment operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: High-reliability buck converter with –55°C to 150°C junction rating and robust short-circuit foldback protection. Use Value: Extended temperature qualification and 150°C TJMAX enable operation in sealed enclosures without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3612EUDD#TRPBF | 2A output current, same 24-pin QFN package, identical pinout and feature set except reduced current rating. | Suitable only for ≤2A loads; lacks DDR sinking capability and has lower ILIM (5A vs 9A peak). | Select when full 4A capability is unnecessary - offers cost and thermal margin benefits for lighter loads. |
| TPS544B20RHLT | 4A, 2MHz max frequency, integrated MOSFETs, but only rated for –40°C to 125°C junction temperature. | No DDR mode or AVP; uses different compensation scheme and lacks programmable slew rate. | Prefer for commercial-temperature designs where TI's WEBENCH support and lower BOM count outweigh extended temp needs. |
Compared with LTC3612EUDD#TRPBF and TPS544B20RHLT, the LTC3614MPUDD#TRPBF uniquely combines –55°C to 150°C operation, ±3A DDR sinking, and programmable slew rate - making it irreplaceable for ruggedized portable and memory-intensive embedded systems.
Availability
LTC3614MPUDD#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and industrial embedded controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3614MPUDD#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 LTC3614MPUDD#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise point-of-load conversion in space-constrained, thermally demanding applications.
FAQ
What is the operating temperature range of the LTC3614MPUDD#TRPBF?
The LTC3614MPUDD#TRPBF is fully specified and tested over a junction temperature range of –55°C to 150°C. This extended grade exceeds standard industrial ratings and supports deployment in sealed enclosures, automotive under-hood locations, and aerospace avionics where passive thermal management dominates. Derating guidelines apply above 125°C per datasheet Note 2.
How does the LTC3614MPUDD#TRPBF support DDR memory termination?
The LTC3614MPUDD#TRPBF supports DDR termination by enabling DDR mode when SRLIM/DDR is tied to SVIN, allowing ±3A bidirectional current flow. Combined with AVP (via ITH-to-SVIN) and precise ±1% output accuracy, it meets JEDEC VTT requirements without external components - directly replacing discrete op-amp/FET solutions.
Can the LTC3614MPUDD#TRPBF synchronize to an external clock?
Yes, the LTC3614MPUDD#TRPBF can synchronize to an external clock applied to the RT/SYNC pin across a 0.3MHz to 4MHz range. The internal slope compensation automatically adapts to the external frequency, ensuring stable current-mode operation without manual recalibration - critical for EMI reduction in noise-sensitive systems.
What is the purpose of the exposed pad (Pin 25) on the LTC3614MPUDD#TRPBF?
The exposed pad (Pin 25) of the LTC3614MPUDD#TRPBF is electrically and thermally connected to PGND. It must be soldered to a dedicated PCB copper pour tied to the main power ground plane. This connection provides the primary thermal conduction path (θJA = 38°C/W) and low-impedance return for high-frequency switch currents - failure to solder it degrades efficiency and thermal performance.
Does the LTC3614MPUDD#TRPBF support programmable soft-start?
Yes, the LTC3614MPUDD#TRPBF supports programmable soft-start via the TRACK/SS pin. Tying TRACK/SS to SVIN enables internal soft-start (0.65–1.9ms). An external RC network (resistor to SVIN, capacitor to SGND) allows precise timing adjustment, while connecting TRACK/SS to another supply enables rail tracking - essential for controlled power-up sequencing.
LTC3614MPUDD#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)
LTC3614MPUDD#TRPBF FAQ
1.How can I place an order for LTC3614MPUDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614MPUDD#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 LTC3614MPUDD#TRPBF reliable?
The price and inventory of LTC3614MPUDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614MPUDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3614MPUDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614MPUDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614MPUDD#TRPBF?
LTC3614MPUDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614MPUDD#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 LTC3614MPUDD#TRPBF?
For technical support, including LTC3614MPUDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614MPUDD#TRPBF requirements.
6.How does Aetrix verify that LTC3614MPUDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3614MPUDD#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 LTC3614MPUDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3614MPUDD#TRPBF?
All LTC3614MPUDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614MPUDD#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 LTC3614MPUDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3614MPUDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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