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Analog Devices Inc. LTC3612HUDC#PBF
- Part No.:
- LTC3612HUDC#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3612HUDC#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:895
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Product details
Overview
LTC3612HUDC#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, 0.6V adjustable output, and 100% duty cycle low-dropout operation. It delivers high efficiency up to 95% in portable computer systems and DDR memory termination applications.
For engineers reviewing the LTC3612HUDC#PBF datasheet, LTC3612HUDC#PBF pinout, LTC3612HUDC#PBF application, or LTC3612HUDC#PBF equivalent, key selection factors include its programmable switching frequency up to 4MHz, ±1% output voltage accuracy, 70µA no-load quiescent current in Burst Mode, and support for forced continuous, pulse-skipping, and external-clamp Burst Mode operation.
Technical Context
The LTC3612HUDC#PBF implements a constant-frequency, current-mode architecture with internal P-channel high-side and N-channel synchronous rectifier switches. Its ITH pin controls peak inductor current via error amplifier output, enabling precise transient response tuning across load and capacitor variations.
It supports three frequency-setting methods: RT/SYNC pin resistor programming (300kHz–4MHz), external clock synchronization (up to 4MHz), or internal 2.25MHz oscillator. The MODE pin selects among forced continuous, pulse-skipping, or Burst Mode (internal or external clamp), while TRACK/SS enables soft-start, tracking, or external reference functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A sinking in DDR mode for bidirectional memory termination. |
| Input Voltage Range | 2.25V to 5.5V; compatible with single Li-Ion and fixed low-voltage rails. |
| Switching Frequency | Programmable up to 4MHz; enables use of sub-1µH inductors and reduces solution size. |
| Quiescent Current | 70µA in Burst Mode at no load; extends battery life in portable devices. |
| Output Accuracy | ±1% over temperature and line/load; ensures stable regulation for precision loads like DDR VTT. |
| Duty Cycle | 100% capability; maintains regulation down to VIN ≈ VOUT + RDS(ON) × IOUT, critical for battery end-of-life operation. |
| Shutdown Current | ≤1µA; minimizes system standby power loss. |
Pinout & Package
Package: 20-pin (3mm × 4mm) leadless QFN (UDC), thermally enhanced with exposed PGND pad (Pin 21) requiring PCB soldering for thermal performance (θJA = 43°C/W). Operating junction temperature range: –40°C to +150°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDR (Pin 1) | DDR Mode Select | Tie to SVIN to enable DDR termination mode with ±1.5A sink/source; tie to SGND for standard 0.6V reference. |
| RT/SYNC (Pin 2) | Oscillator Control | Set frequency via 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 control circuitry; must connect to PGND at single point. |
| SW (Pins 5,6,11,12) | Switch Node | Connection point for inductor; ties to drains of internal P- and N-channel MOSFETs. |
| PVIN (Pins 8,9) | Power Input Supply | Source connection for internal P-MOSFET; may be lower than SVIN to reduce gate drive losses. |
| PVIN_DRV (Pin 13) | Gate Driver Supply | Must connect directly to PVIN to ensure proper high-side gate drive. |
| SVIN (Pin 14) | Signal Input Supply | Powers control logic and enables UVLO monitoring (1.7V–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 VOUT within ±7.5% window; actively pulls down in shutdown for capacitor discharge. |
| MODE (Pin 17) | Operating Mode Select | Voltage-controlled: 0V = Burst Mode (internal clamp), SVIN = pulse-skipping, 1.1V–0.58×SVIN = forced continuous. |
| VFB (Pin 18) | Feedback Input | Senses resistive divider output; regulates VOUT to 0.6V reference (or 0.3V/0.5V in DDR mode). |
| ITH (Pin 19) | Error Amplifier Output | Controls peak inductor current; tie to SVIN to enable internal AVP compensation. |
| TRACK/SS (Pin 20) | Soft-Start/Tracking/Ref | Enables internal soft-start, external RC timing, supply tracking, or external reference input. |
| PGND (Pin 21) | Power Ground | Exposed pad; connects to source of internal N-MOSFET; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronous Switches | Eliminates need for external catch diode, improving efficiency >95% and reducing BOM count and board area. |
| Adjustable Compensation via ITH | Enables optimization of transient response across wide output capacitance and load ranges without external components. |
| Programmable Soft-Start | Prevents inrush current via TRACK/SS pin-configurable with external RC or internal 1ms ramp (0.06V → 0.54V). |
| DDR Memory Termination Mode | Supports ±1.5A bidirectional current for DDR2/DDR3 VTT rails with automatic tracking and fast transient recovery. |
| Low-Noise Forced Continuous Mode | Suppresses switching harmonics in noise-sensitive signal chains by maintaining constant inductor current flow. |
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 <1% accuracy and fast load-step response. Use Value: 4MHz switching enables <1µH inductors and compact 3mm × 4mm QFN footprint, minimizing total solution size. | Use Scenario: Main system rail (e.g., 1.5V CPU core) in ultrabooks or tablets powered by single-cell Li-Ion battery. IC Role / Device Role / Timing Role: High-efficiency step-down converter operating from 2.8V–4.2V battery range with 100% duty cycle during battery depletion. Use Value: 70µA Burst Mode IQ extends runtime at light loads; thermal QFN package sustains 150°C junction under full load. |
| DDR Memory Termination | Handheld Devices |
Use Scenario: VTT termination supply for DDR3L memory interface requiring ±1.5A sourcing/sinking and tight voltage tolerance. IC Role / Device Role / Timing Role: Bidirectional buck-boost capable regulator in DDR mode, tracking VDDQ with fast transient suppression. Use Value: Internal DDR mode eliminates need for external op-amps or discrete FETs; ±1% accuracy meets JEDEC VTT spec. | Use Scenario: Power management for GPS receivers, Bluetooth modules, or PMIC companion rails in smartphones and wearables. IC Role / Device Role / Timing Role: Compact, low-noise DC/DC converter supporting multiple operating modes to balance efficiency and EMI. Use Value: MODE pin-selectable operation allows dynamic switching between Burst Mode (battery life) and forced continuous (RF coexistence). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3A, 28V max input, fixed 500kHz–2.5MHz sync range; no DDR mode or AVP; higher IQ (120µA) | Targeted at industrial supplies with wider VIN; lacks bidirectional DDR capability and fine-grained mode control | Choose for cost-sensitive non-DDR applications where 28V input headroom is required |
| MP2315GJ-Z | 3A, 5.5V max input, fixed 2MHz; no programmable frequency, no DDR mode, no external soft-start | Entry-level portable supply; simpler feature set, lower cost, but limited flexibility in noise-sensitive or tracking designs | Choose when design requires only basic 3A buck with minimal external components and no advanced mode control |
Compared with TPS54332DR and MP2315GJ-Z, the LTC3612HUDC#PBF provides superior light-load efficiency (70µA vs ≥120µA), full DDR termination capability, and flexible frequency/soft-start/mode programming-making it optimal for high-performance portable and memory subsystem designs where precision, density, and multimode adaptability are critical.
Availability
LTC3612HUDC#PBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, portable computer systems, and handheld devices requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LTC3612HUDC#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 with rigorous qualification and long-term support.
The LTC3612HUDC#PBF belongs to Linear's monolithic synchronous buck regulator family, designed specifically for high-density, high-efficiency power conversion in battery-powered and thermally constrained applications demanding precision regulation and multimode adaptability.
FAQ
What is the maximum operating junction temperature for the LTC3612HUDC#PBF?
The LTC3612HUDC#PBF is rated for operation up to +150°C junction temperature, as confirmed by its H-grade qualification and thermal data (θJA = 43°C/W for UDC package). This rating is validated across the full –40°C to +150°C ambient range with appropriate PCB copper area and thermal vias under the exposed PGND pad. The device includes overtemperature protection that activates above 150°C to prevent damage during momentary overload conditions.
Does the LTC3612HUDC#PBF support DDR memory termination with bidirectional current capability?
Yes, the LTC3612HUDC#PBF supports DDR memory termination in dedicated DDR mode, enabled by tying the DDR pin to SVIN. In this mode, it delivers ±1.5A sourcing and sinking capability with fast transient response and tracking functionality via the TRACK/SS pin. The internal reference shifts to 0.3V or 0.5V depending on TRACK/SS voltage, enabling precise VTT regulation compliant with DDR2/DDR3 standards.
How is the switching frequency programmed on the LTC3612HUDC#PBF?
The LTC3612HUDC#PBF offers three frequency configuration methods via the RT/SYNC pin: (1) Connect a resistor from RT/SYNC to GND to set frequency from 300kHz to 4MHz per the datasheet's RRT vs f curve; (2) Apply an external clock signal ≤4MHz to synchronize switching; or (3) Tie RT/SYNC to SVIN to select the internal 2.25MHz oscillator. All methods maintain constant-frequency current-mode control without requiring external compensation changes.
What are the key differences between Burst Mode, Pulse-Skipping Mode, and Forced Continuous Mode on the LTC3612HUDC#PBF?
Burst Mode (MODE = SGND) disables internal circuits at light loads to achieve 70µA IQ but introduces output ripple; Pulse-Skipping (MODE = SVIN) skips cycles while keeping circuits active, offering lower ripple but higher IQ (~120µA); Forced Continuous (MODE = 1.1V–0.58×SVIN) forces uninterrupted switching for lowest EMI and bidirectional current capability, though IQ rises to ~1.1mA. Selection depends on trade-offs between efficiency, noise, and functional requirements like DDR sinking.
Can the LTC3612HUDC#PBF operate with input voltage below 2.5V?
Yes, the LTC3612HUDC#PBF operates down to 2.25V input, making it suitable for single-cell Li-Ion applications near end-of-discharge. However, RDS(ON) of both internal MOSFETs increases at low VIN, raising conduction losses. At 100% duty cycle, output regulation depends on (VIN – IOUT × RDS(ON)), so thermal design must account for elevated power dissipation-especially under full 3A load at 2.25V input.
LTC3612HUDC#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)
LTC3612HUDC#PBF FAQ
1.How can I place an order for LTC3612HUDC#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612HUDC#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 LTC3612HUDC#PBF reliable?
The price and inventory of LTC3612HUDC#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612HUDC#PBF is usually 5 days.
3.What payment methods are accepted for LTC3612HUDC#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612HUDC#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612HUDC#PBF?
LTC3612HUDC#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612HUDC#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 LTC3612HUDC#PBF?
For technical support, including LTC3612HUDC#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612HUDC#PBF requirements.
6.How does Aetrix verify that LTC3612HUDC#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3612HUDC#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 LTC3612HUDC#PBF meets industry standards.
7.What is the process for return or replacement of LTC3612HUDC#PBF?
All LTC3612HUDC#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612HUDC#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 LTC3612HUDC#PBF part is unused and in its original packaging.
Return procedure for LTC3612HUDC#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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