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Analog Devices Inc. LTC3614EUDD#PBF
- Part No.:
- LTC3614EUDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3614EUDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 4A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,357
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Product details
Overview
LTC3614EUDD#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 adjustable output. It delivers high efficiency (up to 95%) in portable computing and DDR memory termination applications.
For engineers reviewing the LTC3614EUDD#PBF datasheet, LTC3614EUDD#PBF pinout, LTC3614EUDD#PBF application, or LTC3614EUDD#PBF equivalent, key selection considerations include its programmable 300kHz–4MHz switching frequency, selectable Burst Mode®/pulse-skipping/forced continuous operation, 75µA sleep-mode quiescent current, and thermally enhanced 24-pin 3mm × 5mm QFN package with exposed PGND pad.
Technical Context
The LTC3614EUDD#PBF implements constant-frequency current-mode control with internal P-channel and N-channel synchronous MOSFETs, enabling 100% duty cycle low-dropout operation and eliminating external catch diodes. Its error amplifier transconductance is 200µS, and ITH pin voltage (0.1V–0.8V) directly controls peak inductor current.
It supports three frequency-setting methods: RT/SYNC pin resistor (300kHz–4MHz), external clock synchronization (up to 4MHz), or internal 2.25MHz oscillator. MODE pin voltage selects among Burst Mode® (75µA IQ), pulse-skipping, or forced continuous operation-critical for noise-sensitive or bidirectional current (±3A DDR) applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous; supports ±3A sinking in DDR mode for memory termination compliance. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion cells and fixed low-voltage rails. |
| Quiescent Current | 75µA in Burst Mode® sleep; enables >100-hour battery life in always-on portable systems. |
| Output Accuracy | ±1% over temperature; ensures stable core voltage for processors and DDR interfaces. |
| Switching Frequency | Programmable up to 4MHz; allows use of sub-1µH inductors and compact 0603/0805 passives. |
| Top/Bottom RDS(ON) | 35mΩ / 25mΩ at 3.3V PVIN; minimizes conduction loss and thermal rise at full load. |
| Feedback Reference | 0.6V internal reference (±0.5% over –40°C to 125°C); sets precise output via resistive divider. |
Pinout & Package
Package: 24-pin, 3mm × 5mm thermally enhanced QFN (UDD) with exposed PGND pad (Pin 25), rated for –40°C to 125°C junction temperature and θJA = 38°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRLIM/DDR (1) | Mode configuration & slew rate control | Tied to SVIN enables DDR mode with ±3A sink capability; resistor-to-ground adjusts slew rate. |
| 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 of SVIN; powers top P-MOSFET; can 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 thermal resistance for 4A switching current path. |
| RUN (19) | Enable/shutdown control | Logic-high enables regulation; grounded forces <1µA shutdown current and discharges output via PGOOD. |
| PGOOD (20) | Open-drain power-good indicator | Asserts after 105µs when VFB stays within ±7.5% window; actively pulls down during shutdown. |
| MODE (21) | Operating mode selection | Voltage-selectable: SGND = Burst Mode®, SVIN = pulse-skipping, 1.1V–0.58×SVIN = forced continuous. |
| VFB (22) | Feedback voltage sensing | Monitors resistive divider output; regulates to 0.6V reference with ±1% accuracy across temperature. |
| ITH (23) | Error amplifier compensation | 0.1V–0.8V control voltage sets peak inductor current; tied to SVIN enables AVP and internal compensation. |
| TRACK/SS (24) | Soft-start & tracking input | Capacitor-to-ground sets soft-start time (0.65–1.9ms); tracks another supply's ramp for sequencing. |
| PGND (25) | Power ground return | Exposed thermal pad; connects to source of bottom N-MOSFET and must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables ultra-low dropout regulation down to VOUT = VIN – IOUT×RDS(ON), extending runtime in battery-depleted states. |
| Programmable slew rate on SW node | Reduces EMI and switching noise via SRLIM/DDR pin resistor, critical for RF-sensitive handheld designs. |
| Adjustable compensation via ITH pin | Allows optimization of transient response across wide output capacitor types (ceramic, polymer, tantalum) and loads. |
| DDR memory termination mode | Configurable ±3A sourcing/sinking with fast transient recovery, meeting JEDEC DDR3/DDR4 VTT requirements. |
| Active Voltage Positioning (AVP) | Internal compensation enabled by tying ITH to SVIN; improves load transient response without external components. |
Applications
| Point-of-Load Regulation | Distributed Power Supplies |
|---|---|
Use Scenario: Local 1.2V/1.8V supply for FPGA core or SoC I/O banks on dense PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated output with fast load-step response and minimal footprint. Use Value: 4MHz operation enables 330nH inductor and 4×10µF input caps, reducing total solution size by >40% vs. 500kHz alternatives. |
Use Scenario: Secondary 2.5V rail in telecom base station card with multiple isolated DC/DC modules sharing common input bus. IC Role / Device Role / Timing Role: High-efficiency, thermally robust step-down converter supporting 4A continuous load with remote sense capability. Use Value: 95% peak efficiency and 38°C/W θJA minimize heat buildup in confined chassis environments. |
| Portable Computer Systems | DDR Memory Termination |
Use Scenario: Main 1.5V processor VDD supply in ultrabook design requiring >8-hour battery life and low-noise operation. IC Role / Device Role / Timing Role: Primary power stage with Burst Mode® for sub-10mA idle current and forced continuous mode for audio subsystem noise immunity. Use Value: 75µA sleep current extends standby time; programmable MODE pin enables seamless transition between efficiency and noise modes. |
Use Scenario: VTT termination supply for DDR3L memory subsystem in embedded industrial controller with ±3A dynamic current demand. IC Role / Device Role / Timing Role: Bidirectional synchronous buck operating in DDR mode, sourcing and sinking up to 3A with matched rise/fall times. Use Value: Internal DDR mode eliminates need for external current-sense amplifiers and dual MOSFET drivers, reducing BOM count by 7 parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 3A max output, fixed 2MHz frequency, no DDR mode or external sync; 12-pin QFN (3mm × 4mm). | Lacks bidirectional current support and programmable frequency; suitable only for basic point-of-load where ±3A sinking is unnecessary. | Select when cost sensitivity outweighs DDR functionality and 4A headroom is not required. |
| TPS54332DR | 3A output, 100kHz–2.5MHz programmable frequency, external compensation, but no Burst Mode® or DDR mode. | Higher 3.5V–28V input range; lacks low-IQ sleep mode (<100µA) and integrated DDR termination logic. | Prefer for wide-input industrial supplies where 2.25V start-up and 75µA IQ are not mandatory. |
Compared with MP2315DJ-LF-Z and TPS54332DR, the LTC3614EUDD#PBF uniquely combines 4A output, 75µA Burst Mode® IQ, DDR ±3A sinking, and 4MHz programmability in a single 3mm × 5mm QFN-enabling smaller, cooler, and more feature-rich power solutions for portable and memory-intensive applications.
Availability
LTC3614EUDD#PBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load regulation requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to 125°C.
Supply support for LTC3614EUDD#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 power management portfolio with rigorous automotive-grade qualification and reliability testing.
The LTC3614EUDD#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-density, low-noise, battery-powered applications demanding ultra-low quiescent current and advanced mode flexibility.
FAQ
What is the maximum supported switching frequency for the LTC3614EUDD#PBF?
The LTC3614EUDD#PBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin-either using a resistor-to-ground or an external clock signal. At 4MHz, it enables use of sub-1µH inductors and significantly reduces output capacitor requirements while maintaining stable current-mode control.
Does the LTC3614EUDD#PBF support DDR memory termination with bidirectional current?
Yes, the LTC3614EUDD#PBF supports DDR memory termination in dedicated DDR mode, activated by tying the SRLIM/DDR pin to SVIN. In this mode, it delivers ±3A sourcing and sinking capability with matched transient response, meeting JEDEC-compliant VTT requirements without external current-sense circuitry.
How does the Burst Mode® operation of the LTC3614EUDD#PBF achieve 75µA quiescent current?
The LTC3614EUDD#PBF achieves 75µA quiescent current in Burst Mode® by intermittently disabling its internal power switches and control circuits during light-load intervals. The MODE pin tied to SGND activates internal burst clamping, allowing the ITH voltage to fall below threshold and enter sleep state-reducing dynamic losses while maintaining output regulation via output capacitance.
What thermal design considerations apply to the LTC3614EUDD#PBF's exposed PGND pad?
Pin 25 (exposed PGND pad) of the LTC3614EUDD#PBF must be soldered to a large PCB copper area for thermal dissipation. With θJA = 38°C/W, proper pad layout-including thermal vias to inner ground planes-is essential to maintain junction temperature ≤125°C at 4A load and 5.5V input, especially in forced continuous mode.
Can the LTC3614EUDD#PBF operate with input voltage as low as 2.25V while regulating 0.6V output?
Yes, the LTC3614EUDD#PBF operates from 2.25V to 5.5V input and supports output voltages down to 0.6V. At low input (e.g., 2.25V), 100% duty cycle capability maintains regulation, though RDS(ON) increases-requiring thermal validation per Typical Performance Characteristics graphs to ensure safe junction temperature.
LTC3614EUDD#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)
LTC3614EUDD#PBF FAQ
1.How can I place an order for LTC3614EUDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3614EUDD#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 LTC3614EUDD#PBF reliable?
The price and inventory of LTC3614EUDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3614EUDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3614EUDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3614EUDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3614EUDD#PBF?
LTC3614EUDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3614EUDD#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 LTC3614EUDD#PBF?
For technical support, including LTC3614EUDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3614EUDD#PBF requirements.
6.How does Aetrix verify that LTC3614EUDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3614EUDD#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 LTC3614EUDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3614EUDD#PBF?
All LTC3614EUDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3614EUDD#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 LTC3614EUDD#PBF part is unused and in its original packaging.
Return procedure for LTC3614EUDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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