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Analog Devices Inc. LTC3612EUDC#PBF
- Part No.:
- LTC3612EUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3612EUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,841
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Product details
Overview
LTC3612EUDC#PBF 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, ±1% output voltage accuracy, and 100% duty cycle low-dropout operation. It delivers regulated power to point-of-load rails in portable computers and DDR memory systems.
For engineers reviewing the LTC3612EUDC#PBF datasheet, LTC3612EUDC#PBF pinout, LTC3612EUDC#PBF application, or LTC3612EUDC#PBF equivalent, key selection criteria include programmable switching frequency up to 4MHz, selectable Burst Mode®/pulse-skipping/forced continuous operation, internal AVP support, and thermal performance in the 3mm × 4mm QFN package.
Technical Context
The LTC3612EUDC#PBF employs constant-frequency current-mode architecture with external RT/SYNC pin control for oscillator frequency setting (300kHz–4MHz), synchronization to external clocks, or internal 2.25MHz operation. Its dual-MOSFET synchronous rectification eliminates external catch diodes and enables bidirectional current flow for DDR termination.
It integrates adjustable compensation via ITH pin, supports active voltage positioning (AVP) when ITH is tied to SVIN, and provides three distinct operating modes-Burst Mode® (70µA IQ), pulse-skipping, and forced continuous-each with distinct transient response, ripple, and efficiency trade-offs across load conditions.
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 Li-Ion and fixed low-voltage supplies. |
| Switching Frequency | Up to 4MHz; externally programmable via RT/SYNC resistor or clock sync. |
| Quiescent Current | 70µA in Burst Mode® sleep; ≤1µA in shutdown-enables long battery life. |
| Output Accuracy | ±1% over temperature; 0.6V internal reference with 0.591V–0.611V tolerance. |
| Duty Cycle | 100% capability; maintains regulation during deep input voltage droop. |
| Package | 20-pin 3mm × 4mm QFN (UDC); exposed PGND pad for thermal management. |
Pinout & Package
Package: 20-lead (3mm × 4mm) plastic QFN (UDC), thermally enhanced with exposed PGND pad (Pin 21) requiring PCB soldering for rated θJA = 43°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| DDR (1) | DDR mode select | Tie to SVIN to enable DDR termination mode; enables TRACK/SS as external reference. |
| RT/SYNC (2) | Oscillator control | Set frequency via resistor-to-GND, sync to external clock ≤4MHz, or tie to SVIN for 2.25MHz internal oscillator. |
| SGND (3) | Signal ground | Reference for feedback, compensation, and small-signal circuitry; connect to PGND at single point. |
| SW (5,6,11,12) | Switch node | Connection to inductor; ties to drains of internal P- and N-channel MOSFETs. |
| PVIN (8,9) | Main power input | Supplies P-channel top switch; independent of SVIN and may be lower voltage. |
| PVIN_DRV (13) | Gate driver supply | Must be connected to PVIN to ensure proper high-side gate drive. |
| SVIN (14) | Control supply | Powers internal logic and bias circuits; monitored by UVLO (2.25V threshold). |
| RUN (15) | Enable input | Active-high; pull low to enter shutdown (<1µA IQ) with active PGOOD discharge path. |
| PGOOD (16) | Power-good indicator | Open-drain output; asserts after 105µs in-window VFB; pulls down during tracking or fault. |
| MODE (17) | Operating mode select | 0V = Burst Mode®; SVIN = pulse-skipping; 1.1V–0.58×SVIN = forced continuous. |
| VFB (18) | Feedback input | Senses resistive divider output; regulates VOUT to 0.6V reference (±1%). |
| ITH (19) | Error amplifier output | Controls peak inductor current; tie to SVIN for internal AVP compensation. |
| TRACK/SS (20) | Soft-start/track/reference | Internal soft-start (tie to SVIN), external capacitor-based timing, or supply tracking input. |
| PGND (21) | Power ground | Exposed pad; connects to source of N-channel MOSFET; must be soldered to PCB ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck topology | Integrated P- and N-channel MOSFETs eliminate external diode, reduce BOM count, and enable sink current for DDR applications. |
| Multi-mode operation | Selectable Burst Mode® (70µA IQ), pulse-skipping, or forced continuous-optimizes efficiency vs. noise vs. transient response per system need. |
| Programmable soft-start | Internal (via TRACK/SS tied to SVIN) or external (RC network) start-up control prevents inrush current and output overshoot. |
| Active Voltage Positioning (AVP) | Enabled by tying ITH to SVIN; dynamically lowers VOUT under load to reduce IR drop and improve system-level regulation. |
| DDR memory termination | Configurable ±1.5A sourcing/sinking via DDR pin and MODE/VFB settings; supports JEDEC-compliant DDR2/DDR3 termination. |
Applications
| Point-of-Load Regulation | DDR Memory Termination |
|---|---|
|
Use Scenario: Regulating core voltage for FPGA or ASIC in space-constrained portable computing systems. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 1.2V/1.8V at up to 3A with fast transient response. Use Value: 100% duty cycle operation extends runtime during battery voltage sag; 4MHz switching allows <1µH inductors and compact layout. |
Use Scenario: Providing matched sourcing and sinking current for DDR2/DDR3 memory VTT rail. IC Role / Device Role / Timing Role: Bidirectional current regulator configured in DDR mode with ±1.5A capability. Use Value: Eliminates discrete termination networks; reduces board area and improves impedance matching versus resistor-based solutions. |
| Portable Computer Power | Distributed Power Architecture |
|
Use Scenario: Supplying processor I/O voltage in ultrabooks with single-cell Li-Ion input (2.8V–4.2V). IC Role / Device Role / Timing Role: Main buck converter with Burst Mode® operation to maintain >85% efficiency at 1mA–100mA loads. Use Value: 70µA quiescent current in sleep mode directly extends standby battery life without compromising wake-up speed. |
Use Scenario: Local regulation of 3.3V or 2.5V rails from intermediate 5V/12V distribution bus in industrial controllers. IC Role / Device Role / Timing Role: High-efficiency local DC/DC converter with programmable frequency to avoid EMI conflicts with communication interfaces. Use Value: External RT/SYNC synchronization enables deterministic switching alignment across multiple LTC3612EUDC#PBF units on same PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 3.5V–28V input, fixed 570kHz fSW, no DDR mode or AVP; 115µA IQ in Eco-mode. | Higher input range suits 12V intermediate bus; lacks bidirectional current and tracking features. | Choose for cost-sensitive industrial supplies where wide VIN and simplicity outweigh DDR/AVP needs. |
| MP2315GJ-Z | 3A, 4.5V–28V input, 1.4MHz fSW, 25µA IQ in skip mode, no ITH pin or AVP; QFN-10 package. | Smaller footprint but limited to higher-VIN applications; no soft-start programming or DDR support. | Prefer for space-constrained 5V/12V-powered IoT nodes where ultra-low IQ matters more than precision regulation. |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612EUDC#PBF uniquely combines ultra-low input voltage (2.25V), programmable high-frequency operation (up to 4MHz), DDR termination capability, and AVP-making it optimal for battery-powered, high-density, multi-rail systems requiring tight output regulation and dynamic load handling.
Availability
LTC3612EUDC#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, portable computer power, and distributed power architecture applications requiring stable component supply, extended temperature operation (–40°C to 125°C), and lead-free compliance.
Supply support for LTC3612EUDC#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 legacy of high-performance analog and power management ICs with rigorous testing and automotive-grade reliability standards.
The LTC3612EUDC#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, low-voltage, high-current point-of-load conversion in portable, computing, and memory subsystem applications.
FAQ
What is the maximum switching frequency supported by the LTC3612EUDC#PBF?
The LTC3612EUDC#PBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin-either through a resistor-to-ground connection or synchronization to an external clock signal. This enables use of sub-1µH inductors and minimizes solution size in space-critical designs.
Does the LTC3612EUDC#PBF support DDR memory termination?
Yes, the LTC3612EUDC#PBF supports DDR memory termination when the DDR pin is tied to SVIN and configured in forced continuous mode. It delivers ±1.5A sourcing and sinking current with precise regulation, meeting JEDEC requirements for DDR2/DDR3 VTT rails without external components.
How does Burst Mode® operation affect light-load efficiency in the LTC3612EUDC#PBF?
In Burst Mode® operation, the LTC3612EUDC#PBF achieves 70µA quiescent current by intermittently enabling the power switches and disabling internal circuitry during idle periods. This reduces switching losses significantly, maintaining >85% efficiency at 1mA load while preserving fast wake-up response.
What is the purpose of the ITH pin on the LTC3612EUDC#PBF?
The ITH pin on the LTC3612EUDC#PBF serves as the error amplifier output and controls peak inductor current. It enables external compensation network design, supports Active Voltage Positioning (AVP) when tied to SVIN, and allows burst clamp adjustment in external Burst Mode® configurations.
Can the LTC3612EUDC#PBF operate with a 2.25V input supply?
Yes, the LTC3612EUDC#PBF is fully specified to operate from 2.25V to 5.5V input. At 2.25V, it maintains regulation using 100% duty cycle operation-critical for extending runtime in deeply discharged single-cell Li-Ion systems-though RDS(ON) increases require thermal verification.
LTC3612EUDC#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-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:
- 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#PBF FAQ
1.How can I place an order for LTC3612EUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612EUDC#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 LTC3612EUDC#PBF reliable?
The price and inventory of LTC3612EUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612EUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3612EUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612EUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612EUDC#PBF?
LTC3612EUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612EUDC#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 LTC3612EUDC#PBF?
For technical support, including LTC3612EUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612EUDC#PBF requirements.
6.How does Aetrix verify that LTC3612EUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3612EUDC#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 LTC3612EUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3612EUDC#PBF?
All LTC3612EUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612EUDC#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 LTC3612EUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3612EUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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