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Analog Devices Inc. LTC3612EUDC#TRPBF
- Part No.:
- LTC3612EUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3612EUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LTC3612EUDC#TRPBF from Analog Devices (formerly Linear Technology) is a 3A, 4MHz monolithic synchronous step-down DC/DC converter with current-mode control, 2.25V–5.5V input range, 0.6V adjustable output, and 70µA no-load quiescent current in Burst Mode. It delivers high efficiency up to 95% and supports 100% duty cycle for low-dropout operation in Li-ion-powered portable systems.
For engineers reviewing the LTC3612EUDC#TRPBF datasheet, LTC3612EUDC#TRPBF pinout, LTC3612EUDC#TRPBF application, or LTC3612EUDC#TRPBF equivalent, key selection criteria include programmable switching frequency (up to 4MHz), selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), DDR memory termination capability, and thermal performance in the 3mm × 4mm QFN package.
Technical Context
The LTC3612EUDC#TRPBF implements constant-frequency current-mode control with external RT/SYNC pin configuration for oscillator frequency setting (300kHz–4MHz), synchronization to external clock, or internal 2.25MHz operation. Its dual-MOSFET synchronous architecture eliminates the need for an external catch diode and enables bidirectional current flow for DDR termination.
It features adjustable compensation via the ITH pin, active voltage positioning (AVP) when ITH is tied to SVIN, and mode-selectable regulation behavior-Burst Mode for ultra-low IQ, Pulse-Skipping for reduced ripple at light load, and Forced Continuous for EMI-sensitive applications requiring fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A sinking for DDR memory termination |
| Input Voltage Range | 2.25V to 5.5V; compatible with single-cell Li-ion and fixed low-voltage rails |
| Quiescent Current | 70µA in Burst Mode sleep; ≤1µA in shutdown |
| Feedback Accuracy | ±1% over temperature; 0.6V internal reference with ±30nA input bias |
| Switching Frequency | Programmable up to 4MHz; enables use of sub-1µH inductors and compact layouts |
| Duty Cycle | 100% capability enables dropout operation down to VOUT + RDS(ON) × IOUT |
| Top/Bottom RDS(ON) | 70mΩ / 45mΩ at PVIN = 3.3V; defines conduction loss and thermal rise at full load |
Pinout & Package
The LTC3612EUDC#TRPBF is housed in a thermally enhanced 20-pin 3mm × 4mm leadless QFN (UDC) package with exposed PGND pad (Pin 21) requiring PCB soldering for rated thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDR (Pin 1) | DDR Mode Select | Tie to SVIN to enable DDR termination mode; enables TRACK/SS as external reference input |
| RT/SYNC (Pin 2) | Oscillator Control | Set frequency with resistor-to-GND, synchronize to external clock ≤4MHz, or tie to SVIN for 2.25MHz internal oscillator |
| SGND (Pin 3) | Signal Ground | Reference for feedback, compensation, and small-signal circuitry; must connect to PGND at single point |
| SW (Pins 5,6,11,12) | Switch Node | Connection to inductor; ties to drains of internal P-channel and N-channel MOSFETs |
| PVIN (Pins 8,9) | Main Power Input | Supplies P-channel MOSFET source; may be lower than SVIN to reduce gate drive loss |
| PVIN_DRV (Pin 13) | Gate Driver Supply | Must be connected to PVIN; powers internal high-side gate driver |
| SVIN (Pin 14) | Control Circuit Supply | Powers internal logic, error amplifier, and comparators; monitored for UVLO (2.25V threshold) |
| RUN (Pin 15) | Enable Input | Active-high; pull low to enter shutdown (<1µA IQ); open or high enables regulation |
| PGOOD (Pin 16) | Power Good Output | Open-drain flag indicating VFB within ±7.5% window; actively pulls down in shutdown |
| MODE (Pin 17) | Operating Mode Select | Voltage-controlled: SGND = Burst Mode, SVIN = Pulse-Skipping, 1.1V–0.58×SVIN = Forced Continuous |
| VFB (Pin 18) | Feedback Input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + R1/R2) |
| ITH (Pin 19) | Error Amplifier Output | Controls peak inductor current; tie to SVIN to enable AVP and internal compensation |
| TRACK/SS (Pin 20) | Soft-Start/Tracking/Ref | Internal soft-start (tie to SVIN), external capacitor-based timing, or tracking reference input |
| PGND (Pin 21) | Power Ground | Exposed pad; connects to N-channel MOSFET source and must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables regulation down to VIN ≈ VOUT + IOUT × RDS(ON), extending battery runtime in portable devices |
| Three-Mode Control Logic | Selectable Burst Mode (70µA IQ), Pulse-Skipping (lower ripple), or Forced Continuous (EMI-controlled spectrum) |
| DDR Memory Termination Support | ±1.5A bidirectional current capability with dedicated DDR pin and tracking-compatible start-up |
| Adjustable Compensation via ITH | External RC network on ITH pin optimizes transient response across wide load/output capacitor ranges |
| Programmable Soft-Start | TRACK/SS pin accepts external RC for user-defined ramp time or tracks another supply's startup sequence |
Applications
| Point-of-Load Regulation | Portable Computer Systems |
|---|---|
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 transient response and minimal external components. Use Value: 4MHz switching enables <1µH inductors and reduces solution footprint by >40% vs 500kHz alternatives. | Use Scenario: Main system rail in ultrabooks or tablets powered by single-cell Li-ion (2.8V–4.2V). IC Role / Device Role / Timing Role: High-efficiency step-down converter maintaining stable output during dynamic CPU load changes. Use Value: 70µA Burst Mode IQ extends standby time; 100% duty cycle sustains operation until battery reaches 2.25V. |
| DDR Memory Termination | Handheld Devices |
Use Scenario: VTT termination supply for DDR3/DDR4 memory interfaces requiring ±1.5A sourcing/sinking capability. IC Role / Device Role / Timing Role: Bidirectional buck regulator configured in DDR mode with tracking-enabled soft-start for controlled ramp-up/down. Use Value: Eliminates need for discrete termination resistors and separate sink/source circuits; reduces BOM count by 6+ components. | Use Scenario: Compact power management in medical handhelds or industrial scanners with strict thermal limits. IC Role / Device Role / Timing Role: Primary DC/DC converter powering microcontroller, display, and sensor subsystems. Use Value: 3mm × 4mm QFN package with exposed PGND pad achieves θJA = 43°C/W, enabling 3A operation without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RHLT | 4A output, 2.95V–16V input, integrated FETs, but requires external compensation and lacks DDR mode | Higher input range suits 12V intermediate bus; no native DDR termination or AVP support | Choose for wider VIN or higher current; avoid if DDR tracking or ultra-low IQ at light load is required |
| MP2315GJ-Z | 3A, 4.5V–28V input, 500kHz–2.5MHz programmable frequency, but 250µA typical IQ in skip mode and no forced continuous mode | Better suited for 5V/12V input systems; lacks burst clamp adjustability and PGOOD accuracy spec | Prefer for cost-sensitive 5V-input designs; not suitable for Li-ion battery systems needing <100µA IQ or precise DDR control |
Compared with TPS543320RHLT and MP2315GJ-Z, the LTC3612EUDC#TRPBF uniquely combines 70µA Burst Mode IQ, DDR termination capability, and 100% duty cycle operation-making it optimal for space-constrained, battery-powered applications demanding both efficiency and bidirectional regulation.
Availability
LTC3612EUDC#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, portable computer systems, DDR memory termination, and handheld devices requiring stable component supply across industrial temperature ranges.
Supply support for LTC3612EUDC#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 analog and power management portfolio with rigorous reliability testing and automotive-grade qualification paths.
The LTC3612EUDC#TRPBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-efficiency, low-noise, and thermally constrained power delivery in portable and embedded systems.
FAQ
What is the maximum switching frequency supported by the LTC3612EUDC#TRPBF?
The LTC3612EUDC#TRPBF 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 resistor value (e.g., ~100kΩ to ground). At 4MHz, the device enables use of sub-1µH inductors and significantly reduces output capacitor requirements, making it ideal for space-constrained designs. The internal oscillator defaults to 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3612EUDC#TRPBF support DDR memory termination?
Yes, the LTC3612EUDC#TRPBF supports DDR memory termination with ±1.5A sourcing and sinking capability. When the DDR pin (Pin 1) is tied to SVIN, the device enters DDR mode, enabling TRACK/SS to function as an external reference and supporting controlled up/down tracking. This allows precise VTT regulation matching DDR bus voltage transitions, eliminating the need for discrete termination networks in DDR3/DDR4 applications.
What is the quiescent current of the LTC3612EUDC#TRPBF in Burst Mode?
The LTC3612EUDC#TRPBF draws 70µA typical quiescent current in Burst Mode at no load while maintaining output regulation, dropping to ≤1µA in shutdown. This ultra-low IQ is achieved by disabling non-essential internal circuitry during idle intervals, significantly extending battery life in portable applications. The burst clamp is internally set when MODE is grounded, or externally adjustable via the MODE pin voltage (0.45V–0.8V).
Can the LTC3612EUDC#TRPBF operate with a 2.25V input supply?
Yes, the LTC3612EUDC#TRPBF operates down to 2.25V input, making it suitable for deeply discharged single-cell Li-ion batteries. At low VIN, RDS(ON) increases-measured at 70mΩ (top) and 45mΩ (bottom) at 3.3V-so thermal design must account for higher conduction loss. The 100% duty cycle capability ensures regulation continues until VOUT drops below VOUT + IOUT × RDS(ON), preserving system uptime.
How is soft-start configured on the LTC3612EUDC#TRPBF?
Soft-start on the LTC3612EUDC#TRPBF is configured via the TRACK/SS pin (Pin 20): tying it to SVIN enables internal 1ms soft-start; connecting an RC network (e.g., 100kΩ to SVIN and 1nF to GND) sets custom ramp time; or using it as a tracking input synchronizes startup with another supply. The internal soft-start time is factory-trimmed to 0.65–1.5ms (typical 1ms), ensuring controlled output voltage rise without inrush current issues.
LTC3612EUDC#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 3A
- Frequency - Switching:
- 300kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
LTC3612EUDC#TRPBF FAQ
1.How can I place an order for LTC3612EUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612EUDC#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 LTC3612EUDC#TRPBF reliable?
The price and inventory of LTC3612EUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612EUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612EUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612EUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612EUDC#TRPBF?
LTC3612EUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612EUDC#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 LTC3612EUDC#TRPBF?
For technical support, including LTC3612EUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612EUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3612EUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612EUDC#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 LTC3612EUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612EUDC#TRPBF?
All LTC3612EUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612EUDC#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 LTC3612EUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612EUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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