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Analog Devices Inc. LTC3615HUF#PBF
- Part No.:
- LTC3615HUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615HUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:421
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Product details
Overview
LTC3615HUF#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC with 3A per channel output capability, operating up to 4MHz switching frequency and supporting 0°/90°/180° inter-channel phase shift. It features ±1% output voltage accuracy, 0.6V minimum output, and 100% duty cycle low-dropout operation - ideal for point-of-load regulation in battery-powered portable computers and DDR memory termination.
For engineers reviewing the LTC3615HUF#PBF datasheet, LTC3615HUF#PBF pinout, LTC3615HUF#PBF application, or LTC3615HUF#PBF equivalent, key selection criteria include dual 3A current capability, programmable slew rate limiting for EMI reduction, selectable Burst/Pulse-Skipping/Forced Continuous modes, internal or external compensation, and thermal grade support up to +150°C junction temperature.
Technical Context
The LTC3615HUF#PBF implements a current-mode, constant-frequency architecture with independent PVIN1/PVIN2 inputs and shared SVIN control supply. Each channel uses internal P-channel high-side and N-channel synchronous rectifier switches, eliminating external catch diodes and enabling high efficiency up to 94%.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), while MODE pin configures operating mode (Burst, Pulse-Skipping, or Forced Continuous). The ITH pins provide error amplifier compensation interface, supporting both internal AVP mode (ITH tied to SVIN) and external compensation networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery input without pre-regulation |
| Output Current per Channel | 3A continuous - enables dual 3A or combined 6A point-of-load supply |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors |
| Output Voltage Accuracy | ±1% over temperature - ensures stable rail regulation for sensitive digital loads like DDR memory |
| Quiescent Current | 130µA in Burst Mode at no load - extends battery runtime in portable systems |
| Shutdown Current | ≤1µA - minimizes standby power loss in always-on subsystems |
| Junction Temperature Range | –40°C to +150°C - qualified for high-reliability industrial and automotive under-hood applications |
Pinout & Package
LTC3615HUF#PBF is housed in a thermally enhanced 24-pin (4mm × 4mm) plastic QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical integrity. θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / Channel 2 switching node | Connects to external inductor; carries high di/dt switching current - requires tight layout and Kelvin connection |
| VFB1 / VFB2 | Feedback input for channel 1 / 2 | Monitors output voltage via resistive divider; sets regulated output with 0.6V internal reference |
| ITH1 / ITH2 | Error amplifier compensation node | Interface for external RC network or tie to SVIN for internal AVP mode - controls loop stability and transient response |
| RUN1 / RUN2 | Enable input for channel 1 / 2 | Active-high logic; pulling low disables respective channel and reduces quiescent current |
| PHASE | Inter-channel phase shift select | 0°/90°/180° selection by voltage level - reduces input ripple in dual-output configurations |
| MODE | Operating mode control | Selects Burst Mode (SGND), Pulse-Skipping (SVIN), or Forced Continuous (1.1V–0.58×SVIN) |
| SRLIM | Slew rate limit and DDR mode enable | Tied to SVIN enables DDR sink capability (±1.5A); resistor-to-SGND adjusts dV/dt for EMI optimization |
| RT/SYNC | Frequency programming/synchronization | Resistor sets fSW (400kHz–4MHz); external clock synchronizes switching to system master clock |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low if output deviates >±7.5% from setpoint - used for sequencing and fault monitoring |
| TRACK/SS1 / TRACK/SS2 | Soft-start and tracking input | Enables internal soft-start, external capacitor-based timing, or voltage tracking of another supply rail |
| PVIN1 / PVIN2 | Power input for channel 1 / 2 | Independent high-side MOSFET source connections - may be tied to same or different input sources |
| SVIN | Signal supply and UVLO monitor | Powers internal circuitry; triggers undervoltage lockout below 2.25V (rising) or 1.7V (falling) |
| SGND | Signal ground reference | Reference for feedback, compensation, and control circuits - must connect to PGND at single point |
| PGND (Pin 25) | Power ground return | Exposed thermal pad; connects to sources of synchronous N-MOSFETs - mandatory PCB soldering for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external diodes, reduces BOM count, and improves efficiency across full load range |
| Programmable inter-channel phase shift | 0°/90°/180° selection minimizes input capacitor RMS current and reduces EMI filtering requirements |
| Adjustable slew rate at SW pins | SRLIM pin enables controlled dV/dt to suppress high-frequency radiated emissions without sacrificing efficiency |
| DDR memory termination mode | When SRLIM = SVIN, supports ±1.5A bidirectional current for DDR VTT rails with accurate tracking |
| Three selectable light-load modes | Burst Mode (130µA IQ), Pulse-Skipping (lower ripple), or Forced Continuous (full regulation, sink capability) |
| 100% duty cycle operation | Maintains regulation as input drops near output voltage - extends usable battery life in portable systems |
Applications
| Point-of-Load Regulation | Portable Computer Power |
|---|---|
Use Scenario: Regulating core voltage for FPGA or ASIC in embedded industrial controller with tight space constraints. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering 1.2V@3A and 3.3V@3A from single 3.3V input. Use Value: High efficiency (>92% at 2A) and small 4mm × 4mm QFN footprint reduce thermal load and PCB area vs discrete solutions. | Use Scenario: Powering CPU core, memory, and I/O rails in ultra-thin laptop with Li-ion battery input. IC Role / Device Role / Timing Role: Primary POL converter with Burst Mode for standby efficiency and Forced Continuous for active load regulation. Use Value: 130µA no-load IQ and 100% duty cycle extend battery runtime; phase-shifted dual outputs minimize input ripple. |
| DDR Memory Termination | Industrial Distributed Power |
Use Scenario: Providing matched VTT termination for DDR3/DDR4 memory subsystem with bidirectional current capability. IC Role / Device Role / Timing Role: Configured in DDR mode (SRLIM = SVIN) to deliver ±1.5A with precise tracking to VDDQ. Use Value: Eliminates need for separate sink/source regulators; ±1% output accuracy ensures JEDEC-compliant termination voltage. | Use Scenario: Generating isolated 5V and 3.3V rails from 12V intermediate bus in factory automation PLC. IC Role / Device Role / Timing Role: Dual-output buck converter with independent PVIN1/PVIN2 inputs enabling flexible input sourcing. Use Value: –40°C to +150°C qualification ensures reliability in uncooled enclosures; low dropout maintains regulation during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3615IUF#PBF | Identical functionality and pinout; rated for –40°C to +125°C junction temperature | Not qualified for extended high-temp environments; unsuitable for under-hood or sealed industrial enclosures | Select when ambient temperature remains ≤125°C and cost sensitivity favors standard grade |
| TPS54383PWPR | 3A dual buck with fixed 3.5MHz fSW, no phase shift, no DDR mode, lower max input (6V) | Lacks programmable phase, slew rate control, and bidirectional DDR sinking - limited to basic POL use | Choose for simpler designs where advanced features are unnecessary and TI ecosystem preference applies |
Compared with LTC3615IUF#PBF, the LTC3615HUF#PBF provides extended thermal margin for harsh environments; versus TPS54383PWPR, it delivers superior EMI control, DDR compliance, and flexible mode selection - critical for high-performance portable and industrial systems.
Availability
LTC3615HUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable computer systems, and DDR memory termination requiring stable component supply with extended temperature reliability.
Supply support for LTC3615HUF#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 precision analog and power management portfolio with rigorous qualification standards.
The LTC3615HUF#PBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for compact, high-current point-of-load regulation in battery-powered and thermally constrained systems.
FAQ
What is the maximum switching frequency supported by the LTC3615HUF#PBF?
The LTC3615HUF#PBF supports an adjustable switching frequency up to 4MHz, either via external resistor on RT/SYNC pin or synchronization to an external clock signal. At 4MHz, it enables use of very small inductors (e.g., 0.47µH) and low-ESR ceramic capacitors, reducing solution size significantly. The internal oscillator defaults to 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3615HUF#PBF support bidirectional current for DDR memory termination?
Yes, the LTC3615HUF#PBF supports bidirectional current in DDR mode when the SRLIM pin is tied to SVIN. In this configuration, it delivers ±1.5A output with accurate tracking to VDDQ, meeting JEDEC specifications for DDR3/DDR4 VTT termination without requiring external sink/source components.
What thermal grade does the LTC3615HUF#PBF support, and how is it validated?
The LTC3615HUF#PBF is specified for operation from –40°C to +150°C junction temperature and is fully tested and guaranteed across that range. This H-grade qualification ensures reliable performance in high-ambient industrial and automotive under-hood applications where standard I-grade (–40°C to +125°C) parts would derate or fail.
How does the PHASE pin configure inter-channel timing in the LTC3615HUF#PBF?
The PHASE pin on the LTC3615HUF#PBF selects inter-channel phase shift: 0° when tied to SGND, 90° when biased to ~0.5×SVIN, and 180° when tied to SVIN. This programmability reduces input capacitor RMS current and output voltage ripple in dual 3A or single 6A configurations - directly improving EMI and thermal performance.
Can the LTC3615HUF#PBF operate with input voltage equal to output voltage?
Yes, the LTC3615HUF#PBF supports 100% duty cycle operation, allowing regulation even when input voltage drops to the output voltage level. This low-dropout capability extends usable battery life in portable systems and maintains rail stability during input brownouts - a key advantage over non-100% duty cycle controllers.
LTC3615HUF#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:
- 2
- 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:
- 400kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3615HUF#PBF FAQ
1.How can I place an order for LTC3615HUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615HUF#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 LTC3615HUF#PBF reliable?
The price and inventory of LTC3615HUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615HUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615HUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615HUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615HUF#PBF?
LTC3615HUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615HUF#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 LTC3615HUF#PBF?
For technical support, including LTC3615HUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615HUF#PBF requirements.
6.How does Aetrix verify that LTC3615HUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615HUF#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 LTC3615HUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615HUF#PBF?
All LTC3615HUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615HUF#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 LTC3615HUF#PBF part is unused and in its original packaging.
Return procedure for LTC3615HUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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