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Analog Devices Inc. LTC3615EUF#PBF
- Part No.:
- LTC3615EUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615EUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,959
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Product details
Overview
LTC3615EUF#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 at up to 4MHz switching frequency, ±1% output voltage accuracy, and 0.6V minimum output voltage. It delivers high-efficiency power conversion for point-of-load applications in portable computing and DDR memory systems.
For engineers reviewing the LTC3615EUF#PBF datasheet, LTC3615EUF#PBF pinout, LTC3615EUF#PBF application, or LTC3615EUF#PBF equivalent, key selection considerations include phase-shift configuration (0°/90°/180°), programmable slew rate limiting, selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal/external compensation flexibility, and thermal performance in the 4mm × 4mm QFN-24 package.
Technical Context
The LTC3615EUF#PBF implements current-mode, constant-frequency control across two independent 3A channels sharing synchronized clock and reference circuits to ensure tight channel-to-channel matching. Its architecture integrates P-channel high-side and N-channel low-side synchronous MOSFETs, eliminating external catch diodes and enabling 100% duty cycle operation for ultra-low dropout performance.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), reducing input/output ripple in dual-output or single 6A configurations. The MODE pin configures four distinct operating modes-Burst Mode (internal/external clamp), Pulse-Skipping, and Forced Continuous-with corresponding ITH voltage thresholds and current-limit behavior confirmed across temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery operation without external LDO pre-regulation. |
| Output Current per Channel | 3A continuous - enables compact dual-rail PoL supplies for processors or DDR termination. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and reduces solution footprint. |
| Feedback Accuracy | ±1% over –40°C to 125°C - ensures stable regulation under thermal stress in embedded systems. |
| Quiescent Current | 130µA in Burst Mode - extends battery runtime in always-on portable devices. |
| Shutdown Current | ≤1µA - meets stringent system-level standby power requirements. |
| Output Voltage Min | 0.6V - supports modern low-voltage core rails including DDR4/DDR5 VDDQ and SoC cores. |
Pinout & Package
The LTC3615EUF#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 / 2 Switching Node | Connects to external inductor; carries high di/dt current - requires short, low-inductance routing. |
| VFB1 / VFB2 | Channel 1 / 2 Feedback Input | Monitors output voltage via resistive divider; sets regulated output with ±1% accuracy. |
| ITH1 / ITH2 | Error Amplifier Compensation | Controls peak inductor current; ties to SVIN for AVP mode or external RC for custom loop response. |
| RUN1 / RUN2 | Channel Enable Inputs | Active-high logic; pulling either low disables its channel; both low places IC in <1µA shutdown. |
| PHASE | Inter-channel Phase Shift Control | 0°/90°/180° selection via SGND/half-SVIN/SVIN - minimizes input ripple in dual-output designs. |
| SRLIM | Slew Rate Limit / DDR Mode Enable | Tied to SGND → max slew; open → min slew; tied to SVIN → DDR sink mode + dynamic PGOOD window. |
| PGOOD1 / PGOOD2 | Power Good Outputs | Open-drain status flags indicating ±7.5% output regulation window - used for sequencing and fault reporting. |
| TRACK/SS1 / TRACK/SS2 | Soft-Start / Tracking Input | Enables internal soft-start (tie to SVIN), external capacitor-based timing, or supply tracking for rail coordination. |
| RT/SYNC | Oscillator Frequency Control | Resistor-to-ground sets fSW; external clock synchronizes up to 4MHz; tie to SVIN for 2.25MHz default. |
| MODE | Operating Mode Selection | SGND → Burst Mode (internal clamp); SVIN → Pulse-Skipping; 1.1V–0.58×SVIN → Forced Continuous. |
| PVIN1 / PVIN2 | Channel Power Input | Independent high-side MOSFET sources - may be connected to same or lower voltage than SVIN. |
| SVIN | Signal Supply Input | Powers internal control circuitry and feeds UVLO comparator - must be ≥2.25V to enable operation. |
| SGND | Signal Ground Reference | Reference for all small-signal pins (FB, ITH, TRACK/SS); connects to PGND at single point to avoid noise coupling. |
| PGND (Pin 25) | Power Ground | Exposed thermal pad; common source node for both N-channel switches - must be soldered to large copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A Synchronous Buck Architecture | Integrates matched P/N-channel MOSFETs per channel - eliminates external diodes and reduces BOM count by ≥4 components. |
| Programmable Phase Shift (0°/90°/180°) | Reduces RMS input current ripple by up to 70% in dual 3A configuration - lowers input capacitor stress and EMI filter size. |
| Three Selectable Operating Modes | Burst Mode (130µA IQ), Pulse-Skipping (lower ripple), and Forced Continuous (sinking capability) - optimized for efficiency vs. noise trade-offs. |
| Adjustable Slew Rate Limiting | Configurable via SRLIM resistor - directly controls EMI generation at switch nodes without sacrificing transient response. |
| Active Voltage Positioning (AVP) | Enabled by tying ITHx to SVIN - dynamically lowers output voltage under load to reduce IR drop and improve system efficiency. |
| DDR Memory Termination Support | Activated when SRLIM = SVIN - enables ±1.5A sinking capability and tracks PGOOD window to TRACK/SS voltage for DDR compliance. |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
Use Scenario: Regulating 1.8V/3A and 2.5V/3A rails for FPGA I/O banks and core logic in space-constrained industrial controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck controller providing tightly regulated, sequenced outputs with minimal external components. Use Value: 94% peak efficiency and 130µA no-load IQ extend operational time; 4MHz capability enables 0.47µH inductors, saving >30% board area vs. 1MHz solutions. | Use Scenario: Powering CPU core and memory subsystems in ultrabooks with battery input ranging from 4.2V (full) to 2.8V (discharged). IC Role / Device Role / Timing Role: Dual buck regulator delivering 1.2V/3A and 1.5V/3A with 100% duty cycle dropout support during brownout conditions. Use Value: Maintains regulation down to 2.25V input; phase-shifted operation reduces input capacitor RMS current by 45%, allowing smaller 100µF ceramic arrays. |
| DDR Memory Termination | Handheld Device Power Management |
Use Scenario: Providing VTT termination for DDR4 memory interfaces requiring ±1.5A bidirectional current sourcing/sinking. IC Role / Device Role / Timing Role: Configured in DDR mode (SRLIM = SVIN) with active tracking of VREF to maintain precise termination voltage. Use Value: Eliminates need for discrete op-amp + MOSFET termination circuit; integrated PGOOD tracking ensures safe startup/shutdown sequencing. | Use Scenario: Managing multiple voltage rails (1.1V core, 1.8V I/O, 3.3V peripherals) in Bluetooth headsets with strict size and thermal constraints. IC Role / Device Role / Timing Role: Single-package dual regulator replacing two discrete converters - simplifies layout and improves thermal coupling between channels. Use Value: 4mm × 4mm QFN footprint fits within 12mm² PCB area; 37°C/W θJA enables full 3A/channel operation without heatsink at 50°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RTWR | Single 6A output (not dual 3A); supports PMBus interface; fixed 500kHz–2.2MHz frequency range. | Requires external sequencing for multi-rail systems; lacks native DDR sink mode and AVP. | Preferred when digital monitoring/control is required and dual independent rails are not needed. |
| ISL85415IRZ-T7A | Dual 3A with fixed 2.1MHz frequency; no phase-shift option; only Burst Mode and PWM modes (no Pulse-Skipping). | Lower design flexibility for EMI-sensitive layouts; missing SRLIM-controlled slew rate and TRACK/SS-based tracking. | Selected for cost-sensitive applications where 2.1MHz fixed frequency suffices and phase optimization is unnecessary. |
Compared with TPS543320RTWR and ISL85415IRZ-T7A, the LTC3615EUF#PBF offers unique phase-shift configurability, DDR-specific sink capability, and three distinct light-load modes - making it optimal for compact, multi-rail, battery-powered systems demanding both efficiency and precise rail coordination.
Availability
LTC3615EUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable computer systems, and DDR memory termination requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 125°C.
Supply support for LTC3615EUF#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 characterization and automotive-grade reliability standards.
The LTC3615EUF#PBF belongs to Linear's monolithic synchronous buck regulator product line, designed specifically for high-density, high-efficiency DC/DC conversion in battery-powered and thermally constrained applications.
FAQ
What is the maximum supported switching frequency for the LTC3615EUF#PBF?
The LTC3615EUF#PBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin using either a resistor-to-ground network or an external clock signal. When RT/SYNC is tied to SVIN, it defaults to 2.25MHz. This high-frequency capability enables use of compact 0.47µH inductors and reduces overall solution size while maintaining stability across load and line variations.
Does the LTC3615EUF#PBF support DDR memory termination with sinking current capability?
Yes, the LTC3615EUF#PBF supports DDR memory termination when the SRLIM pin is tied to SVIN, enabling DDR mode. In this configuration, it provides ±1.5A bidirectional current capability and dynamically adjusts the PGOOD window relative to the TRACK/SS voltage - meeting JEDEC-compliant DDR4 VTT requirements without external circuitry.
How does phase shift selection affect input current ripple in the LTC3615EUF#PBF?
The LTC3615EUF#PBF allows 0°, 90°, or 180° phase shift between SW1 and SW2 via the PHASE pin. At 180°, input current ripple is minimized - reducing RMS input capacitor current by up to 70% compared to 0° operation. This directly lowers input capacitor heating and permits smaller ceramic capacitor arrays in space-constrained designs.
What are the key differences between Burst Mode, Pulse-Skipping, and Forced Continuous modes on the LTC3615EUF#PBF?
Burst Mode (MODE = SGND) minimizes IQ to 130µA by disabling internal circuitry during light loads; Pulse-Skipping (MODE = SVIN) skips cycles but keeps circuits active for lower ripple; Forced Continuous (MODE = 1.1V–0.58×SVIN) sustains switching at all loads - required for sinking current and DDR mode. Each mode is validated across –40°C to 125°C.
Can the LTC3615EUF#PBF operate with input voltage below 2.25V?
No - the LTC3615EUF#PBF has a hard undervoltage lockout (UVLO) threshold of 2.25V on the SVIN pin. Below this, the device remains disabled and draws negligible current. The PVIN1/PVIN2 inputs may be lower than SVIN, but SVIN must remain ≥2.25V for functional operation; operation down to 2.25V input enables full utilization of single-cell Li-ion batteries before cutoff.
LTC3615EUF#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)
LTC3615EUF#PBF FAQ
1.How can I place an order for LTC3615EUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615EUF#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 LTC3615EUF#PBF reliable?
The price and inventory of LTC3615EUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615EUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615EUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615EUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615EUF#PBF?
LTC3615EUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615EUF#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 LTC3615EUF#PBF?
For technical support, including LTC3615EUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615EUF#PBF requirements.
6.How does Aetrix verify that LTC3615EUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615EUF#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 LTC3615EUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615EUF#PBF?
All LTC3615EUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615EUF#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 LTC3615EUF#PBF part is unused and in its original packaging.
Return procedure for LTC3615EUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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