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Analog Devices Inc. LTC3612HUDC#TRPBF
- Part No.:
- LTC3612HUDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC3612HUDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
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Product details
Overview
LTC3612HUDC#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 100% duty cycle capability for low-dropout operation in battery-powered systems. It supports Burst Mode® (70µA IQ), forced continuous mode, and external synchronization up to 4MHz.
For engineers reviewing the LTC3612HUDC#TRPBF datasheet, LTC3612HUDC#TRPBF pinout, LTC3612HUDC#TRPBF application, or LTC3612HUDC#TRPBF equivalent, key selection criteria include its thermally enhanced 20-pin 3mm × 4mm QFN package rated for –40°C to 150°C junction temperature, ±1% output voltage accuracy, and selectable operating modes (Burst/Pulse-Skipping/Forced Continuous) via the MODE pin.
Technical Context
The LTC3612HUDC#TRPBF implements a constant-frequency, current-mode architecture with internal P-channel high-side and N-channel synchronous rectifier switches. Its error amplifier drives the ITH pin to regulate peak inductor current, while slope compensation adapts automatically during external synchronization.
It features dual-mode soft-start (internal or external via TRACK/SS), programmable AVP via ITH-to-SVIN connection, and DDR memory termination support (±1.5A sinking/sourcing) when DDR pin is tied to SVIN. The device integrates undervoltage lockout (1.7V/2.25V thresholds), overtemperature protection, and PGOOD monitoring with 70–140µs blanking time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous; supports ±1.5A bidirectional current for DDR termination |
| Input Voltage Range | 2.25V to 5.5V; enables single Li-Ion and fixed low-voltage rail use |
| Quiescent Current | 70µA in Burst Mode® at no load; ≤1µA in shutdown |
| Output Voltage Accuracy | ±1% over temperature; 0.6V internal reference with external tracking capability |
| Switching Frequency | Programmable 300kHz–4MHz via RT/SYNC resistor or external clock |
| Efficiency | Up to 95% at full load; optimized by synchronous rectification and low RDS(ON) (70mΩ/45mΩ) |
| Operating Temperature | –40°C to +150°C junction; H-grade qualification for automotive/industrial environments |
Pinout & Package
The LTC3612HUDC#TRPBF is housed in a thermally enhanced 20-pin 3mm × 4mm plastic QFN (UDC package) with exposed PGND pad (Pin 21) requiring PCB soldering for thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DDR (Pin 1) | DDR Mode Select | Tie to SVIN to enable ±1.5A bidirectional output for DDR memory termination |
| 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 small-signal circuitry; must connect to PGND at single point |
| SW (Pins 5,6,11,12) | Switch Node | Connection point for external inductor; ties to drains of internal P- and N-channel MOSFETs |
| PVIN (Pins 8,9) | Power Input Supply | Supplies high-side P-MOSFET source; may be lower than SVIN to reduce gate drive loss |
| PVIN_DRV (Pin 13) | Gate Driver Supply | Must be connected to PVIN to ensure proper high-side gate drive voltage |
| SVIN (Pin 14) | Signal Input Supply | Powers control logic and enables UVLO detection (1.7V/2.25V thresholds) |
| RUN (Pin 15) | Enable Input | Active-high; pull low to enter shutdown (<1µA IQ) with active PGOOD discharge path |
| PGOOD (Pin 16) | Power Good Output | Open-drain flag indicating VFB within ±7.5% window; blanked for 70–140µs during transitions |
| MODE (Pin 17) | Operating Mode Select | SGND = Burst Mode®; SVIN = Pulse-Skipping; 1.1V–0.58×SVIN = Forced Continuous |
| VFB (Pin 18) | Feedback Input | Senses resistive divider output; regulates to 0.6V internal reference or external TRACK/SS voltage |
| ITH (Pin 19) | Error Amplifier Output | Controls peak inductor current; tie to SVIN to enable internal compensation and AVP |
| TRACK/SS (Pin 20) | Soft-Start/Tracking/Ref | Internal soft-start (tie to SVIN), external timing (RC), or tracking reference input |
| PGND (Pin 21) | Power Ground | Exposed pad; connects to N-MOSFET source and must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables ultra-low dropout regulation down to VIN ≈ VOUT, extending battery runtime in portable systems |
| Adjustable Switching Frequency | 300kHz–4MHz range allows optimization of inductor size, efficiency, and EMI profile for specific board layout constraints |
| Bidirectional Current Capability | ±1.5A sourcing/sinking in DDR mode meets JEDEC-compliant termination requirements for DDR2/DDR3 memory rails |
| Three-Mode Control Logic | Selectable Burst Mode® (low IQ), Pulse-Skipping (low ripple), or Forced Continuous (EMI-controlled) via single MODE pin voltage |
| Integrated AVP Support | Tying ITH to SVIN enables Active Voltage Positioning for dynamic load-line adjustment in CPU/GPU VRMs |
Applications
| Point-of-Load Regulation | Portable Computer Systems |
|---|---|
Use Scenario: Regulating core voltage for FPGA or ASIC on dense PCBs with tight space constraints. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 0.85V–1.2V at up to 3A with fast transient response. Use Value: High efficiency (≥92% at 1A) and compact 3mm × 4mm QFN minimize heat and board area; 4MHz switching enables <1µH inductors. | Use Scenario: Powering SoC subsystems in ultrabooks and 2-in-1 devices with single-cell Li-Ion input. IC Role / Device Role / Timing Role: Main system PMIC buck stage converting 3.3V/5V rails to processor I/O and memory voltages. Use Value: 70µA Burst Mode® IQ extends standby time; 100% duty cycle maintains regulation as battery discharges to 2.5V. |
| DDR Memory Termination | Handheld Devices |
Use Scenario: Providing VTT termination for DDR3L memory in embedded computing modules. IC Role / Device Role / Timing Role: Bidirectional buck-boost regulator operating in DDR mode with ±1.5A current capability. Use Value: Eliminates need for discrete termination resistors and external op-amps; supports JEDEC-specified sink/source symmetry. | Use Scenario: Supplying camera sensor, display backlight, and RF transceiver rails in smartphones and tablets. IC Role / Device Role / Timing Role: Secondary buck converter generating 1.8V/2.8V rails from main battery or PMIC output. Use Value: Low-noise forced continuous mode avoids interference with sensitive analog/RF sections; thermal grade supports sealed enclosures. |
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, 2.95–16V input, integrated FETs, but requires external compensation and lacks DDR mode | Higher input range suits industrial 12V systems; no bidirectional current support limits DDR use | Choose for wider VIN and higher current; avoid when DDR termination or low-VIN battery operation is required |
| MP2315GJ-Z | 3A, 4.5–28V input, smaller 8-pin SOIC package, no synchronization or DDR mode, 3.5µA shutdown IQ | Targeted at cost-sensitive industrial supplies; lacks soft-start programming and precision PGOOD | Choose for simple fixed-output designs with high-VIN; avoid when Burst Mode®, tracking, or DDR compliance is needed |
Compared with TPS543320RHLT and MP2315GJ-Z, the LTC3612HUDC#TRPBF uniquely combines ultra-low 2.25V input support, ±1.5A DDR termination, and 70µA Burst Mode® IQ-making it optimal for space-constrained, battery-powered applications demanding precision regulation and thermal robustness.
Availability
LTC3612HUDC#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, DDR memory termination, and portable computer systems requiring stable component supply across extended temperature ranges.
Supply support for LTC3612HUDC#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 legacy of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3612HUDC#TRPBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-efficiency, low-noise, thermally demanding applications in portable and embedded systems.
FAQ
What is the maximum junction temperature rating for the LTC3612HUDC#TRPBF?
The LTC3612HUDC#TRPBF is an H-grade device qualified for operation from –40°C to +150°C junction temperature. This rating is verified per Linear Technology/Analog Devices specifications and enables use in under-hood automotive modules and high-ambient industrial environments where thermal headroom is critical. The UDC QFN package achieves θJA = 43°C/W with proper PCB thermal design.
Does the LTC3612HUDC#TRPBF support external synchronization, and what is the maximum frequency?
Yes, the LTC3612HUDC#TRPBF supports external synchronization via the RT/SYNC pin, accepting clock signals up to 4MHz. When synchronized, the internal slope compensation automatically adapts to maintain stable current-mode operation. This feature allows precise EMI control and noise-sensitive system-level timing alignment without sacrificing regulation accuracy or transient response.
How does the MODE pin configure operating modes on the LTC3612HUDC#TRPBF?
The MODE pin on the LTC3612HUDC#TRPBF selects between four distinct operating modes: tying to SGND enables Burst Mode® (70µA IQ); tying to SVIN enables Pulse-Skipping; applying 1.1V–0.58×SVIN enables Forced Continuous; and applying 0.45V–0.8V enables externally clamped Burst Mode®. Each setting directly determines light-load efficiency, output ripple, and EMI profile without requiring additional control signals.
Can the LTC3612HUDC#TRPBF be used for DDR memory termination, and what configuration is required?
Yes, the LTC3612HUDC#TRPBF supports DDR memory termination in ±1.5A bidirectional mode. To enable this, the DDR pin (Pin 1) must be tied to SVIN, and the TRACK/SS pin used as external reference input. This configuration meets JEDEC-specified VTT termination requirements for DDR2/DDR3, eliminating discrete components while maintaining tight voltage regulation during sourcing and sinking transients.
What is the purpose of the exposed pad (Pin 21) on the LTC3612HUDC#TRPBF QFN package?
The exposed pad (Pin 21) on the LTC3612HUDC#TRPBF is PGND-the power ground connection for the internal N-channel MOSFET source. It must be soldered to a large PCB copper pour to achieve the specified θJA = 43°C/W thermal resistance and prevent junction temperature exceedance under 3A load. Failure to properly connect this pad will degrade thermal performance and may trigger overtemperature protection.
LTC3612HUDC#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)
LTC3612HUDC#TRPBF FAQ
1.How can I place an order for LTC3612HUDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3612HUDC#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 LTC3612HUDC#TRPBF reliable?
The price and inventory of LTC3612HUDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3612HUDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3612HUDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3612HUDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3612HUDC#TRPBF?
LTC3612HUDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3612HUDC#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 LTC3612HUDC#TRPBF?
For technical support, including LTC3612HUDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3612HUDC#TRPBF requirements.
6.How does Aetrix verify that LTC3612HUDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3612HUDC#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 LTC3612HUDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3612HUDC#TRPBF?
All LTC3612HUDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3612HUDC#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 LTC3612HUDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3612HUDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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