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Analog Devices Inc. LTC3615IFE#PBF
- Part No.:
- LTC3615IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615IFE#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:152
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Product details
Overview
LTC3615IFE#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. It features current-mode control, 0°/90°/180° programmable inter-channel phase shift, ±1% output voltage accuracy down to 0.6V, and 130µA quiescent current in Burst Mode - optimized for single-cell Li-Ion portable systems requiring high-efficiency point-of-load regulation.
For engineers reviewing the LTC3615IFE#PBF datasheet, LTC3615IFE#PBF pinout, LTC3615IFE#PBF application, or LTC3615IFE#PBF equivalent, key selection criteria include dual 3A output capability with selectable phase shift, low-noise Burst Mode operation, internal/external compensation flexibility, DDR memory termination support, and thermally enhanced TSSOP-24 packaging for industrial-grade thermal performance.
Technical Context
The LTC3615IFE#PBF implements a dual-channel, constant-frequency current-mode architecture with shared clock and reference circuits to ensure tight channel-to-channel matching. Each channel integrates P-channel high-side and N-channel synchronous rectifier MOSFETs, eliminating external catch diodes and enabling 100% duty cycle low-dropout operation.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), reducing input ripple in dual-output configurations or enabling single 6A output with interleaved operation. MODE pin selection determines operating mode - Burst Mode (130µA IQ), Pulse-Skipping, or Forced Continuous - with AVP support when ITH is tied to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single Li-Ion battery operation across full discharge curve. |
| Output Current per Channel | 3A continuous - enables dual independent POL supplies or interleaved 6A output. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Quiescent Current | 130µA in Burst Mode - extends battery runtime in standby and light-load conditions. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core voltage regulation for sensitive processors and memory. |
| Phase Shift Options | 0°, 90°, or 180° - minimizes input capacitor RMS current and output voltage ripple in multi-rail systems. |
| Shutdown Current | ≤1µA - enables true system-level power gating without leakage concerns. |
Pinout & Package
The LTC3615IFE#PBF is housed in a thermally enhanced 24-pin plastic eTSSOP package (FE package), with exposed PGND pad (Pin 25) requiring solder connection to PCB for optimal thermal performance and EMI control. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (Pin 1) | Phase shift configuration input | Selects 0° (SGND), 90° (SVIN/2), or 180° (SVIN) inter-channel timing for ripple reduction. |
| VFB1/VFB2 (Pins 2,5) | Feedback voltage input | Monitors output voltage via resistive divider; sets regulation point with 0.6V internal reference. |
| ITH1/ITH2 (Pins 3,6) | Error amplifier compensation node | Accepts external RC network for loop stability; tie to SVIN to enable AVP with internal compensation. |
| RUN1/RUN2 (Pins 11,10) | Channel enable inputs | Logic-high (>1V) enables respective channel; both low disables entire device (<1µA shutdown current). |
| RT/SYNC (Pin 12) | Oscillator frequency control | Resistor-to-ground sets fSW (400kHz–4MHz); external clock synchronizes switching; tie to SVIN for 2.25MHz default. |
| SRLIM (Pin 14) | Slew rate and DDR mode control | Tied to SGND → max slew; open → min slew; tied to SVIN → max slew + DDR sink-current mode (±1.5A). |
| PGOOD1/PGOOD2 (Pins 15,13) | Open-drain power-good indicators | Pulled low if VOUT deviates >±7.5% from setpoint or RUNx is inactive - enables system sequencing and fault reporting. |
| PGND (Pin 25) | Power ground return | Exposed thermal pad; must be soldered to large PCB copper area for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external diodes, reduces BOM count, improves efficiency up to 94%, and enables compact layout. |
| Programmable inter-channel phase shift | 0°/90°/180° selection reduces input capacitor stress and output voltage ripple in dual- or single-output configurations. |
| Burst Mode with 130µA IQ | Maintains regulation at light loads while minimizing switching losses - critical for battery life in portable devices. |
| 100% duty cycle low-dropout operation | Extends usable battery range by sustaining output as input voltage approaches VOUT, e.g., 3.0V → 2.5V rail. |
| DDR memory termination support | SRLIM = SVIN activates ±1.5A sink/source capability and dynamic PGOOD window tracking for DDR VTT applications. |
| Flexible soft-start and tracking | TRACK/SS pins support internal fixed-time, external RC-timed, or supply-tracking startup - prevents inrush and ensures safe power sequencing. |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
Use Scenario: Regulating core voltage for FPGA, ASIC, or microprocessor in embedded industrial controller. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering 1.2V@3A and 3.3V@3A with independent enable and soft-start. Use Value: Tight load/line regulation (±1%), low-noise Burst Mode, and 0°/180° phase options reduce system-level ripple and improve transient response. | Use Scenario: Power management in ultrabook or tablet with single-cell Li-Ion battery and multiple voltage rails. IC Role / Device Role / Timing Role: Primary POL converter supplying CPU core, memory, and I/O rails with adaptive mode selection (Burst/Pulse-Skipping/FCM). Use Value: 2.25–5.5V input range matches full battery discharge; 130µA IQ extends standby time; TSSOP-24 enables reliable thermal design in thin form factors. |
| DDR Memory Termination | Industrial Distributed Power |
Use Scenario: Providing matched ±1.5A VTT termination for DDR3/DDR4 memory subsystems. IC Role / Device Role / Timing Role: SRLIM = SVIN configures DDR mode with active voltage positioning and dynamic PGOOD tracking relative to TRACK/SS. Use Value: Eliminates need for discrete op-amp + MOSFET VTT solution; reduces component count, board space, and thermal complexity. | Use Scenario: Compact, high-efficiency 6A distributed supply in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: Interleaved 180° dual-channel operation delivering 6A total with reduced input ripple and shared thermal load. Use Value: 24-pin TSSOP with exposed PGND pad achieves 33°C/W θJA; -40°C to 125°C rating ensures reliability in harsh environments. |
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 |
|---|---|---|---|
| LTC3615IUF#PBF | Same electrical specs, but in 4mm × 4mm QFN-24 package with θJA = 37°C/W - higher thermal resistance than TSSOP. | Preferred where board space is constrained and thermal management uses bottom-side copper; less suitable for high-ambient industrial enclosures. | Select LTC3615IUF#PBF only if footprint size is prioritized over thermal margin and airflow is limited. |
| LTC3615IFE-1#PBF | Same FE package and pinout, but implements 140°/180° phase shift (LTC3615-1 variant) instead of 0°/90°/180° - no 0° or 90° option. | Used where 140° interleaving is required for specific EMI compliance or legacy design compatibility; not drop-in for 0°/90° designs. | Choose LTC3615IFE-1#PBF only when 140° phase alignment is explicitly needed; verify timing and ripple requirements match. |
Compared with LTC3615IUF#PBF, the LTC3615IFE#PBF offers superior thermal performance in air-cooled industrial settings due to lower θJA, while LTC3615IFE-1#PBF provides a distinct phase-shift profile suited for specialized EMI-sensitive applications - neither is pin-compatible or functionally identical without design review.
Availability
LTC3615IFE#PBF is available at Aetrix Electronics and suitable for portable computing, industrial PLCs, DDR memory subsystems, and battery-powered instrumentation requiring stable component supply with guaranteed long-term availability.
Supply support for LTC3615IFE#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3615IFE#PBF belongs to Linear's high-performance monolithic DC/DC regulator family, designed specifically for demanding point-of-load applications in portable, industrial, and communications equipment where efficiency, small size, and thermal robustness are critical.
FAQ
What is the maximum switching frequency supported by the LTC3615IFE#PBF?
The LTC3615IFE#PBF supports an adjustable switching frequency from 400kHz up to 4MHz. This is achieved either by connecting a resistor from RT/SYNC to ground, applying an external clock signal to RT/SYNC, or tying RT/SYNC to SVIN for the default 2.25MHz internal oscillator. The 4MHz upper limit enables use of very small inductors and ceramic capacitors, reducing solution size and cost in space-constrained designs.
Does the LTC3615IFE#PBF support DDR memory termination?
Yes, the LTC3615IFE#PBF supports DDR memory termination when the SRLIM pin is tied to SVIN. In this configuration, it enters DDR mode with ±1.5A sink/source capability and dynamic PGOOD window tracking relative to the TRACK/SS pin voltage. This eliminates the need for external op-amps and discrete FETs in DDR3/DDR4 VTT applications, simplifying design and improving reliability.
What is the thermal performance difference between the LTC3615IFE#PBF and LTC3615IUF#PBF packages?
The LTC3615IFE#PBF in 24-pin eTSSOP (FE) has θJA = 33°C/W, while the LTC3615IUF#PBF in 4mm × 4mm QFN (UF) has θJA = 37°C/W. This 4°C/W difference reflects better natural convection cooling in the TSSOP package due to larger exposed surface area and lead-frame construction - making the LTC3615IFE#PBF preferable for industrial applications with limited airflow or elevated ambient temperatures.
Can the LTC3615IFE#PBF operate with input voltage equal to the output voltage?
Yes, the LTC3615IFE#PBF supports 100% duty cycle operation, enabling low-dropout regulation where input voltage approaches or equals output voltage - for example, maintaining a 2.5V rail as a single Li-Ion cell discharges from 3.3V to 2.7V. This extends usable battery life in portable systems without requiring additional LDO stages or complex power-path management.
How does phase shift selection affect input ripple in dual-output configurations using the LTC3615IFE#PBF?
Phase shift selection directly reduces RMS input capacitor current: 0° yields highest ripple (equivalent to two independent converters), 90° reduces it significantly, and 180° (fully interleaved) minimizes input ripple by canceling harmonic components. For a dual 3A output, 180° phase shift cuts peak-to-peak input ripple by ~70% compared to 0°, allowing smaller input capacitance and lower EMI filter requirements in the LTC3615IFE#PBF design.
LTC3615IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP
LTC3615IFE#PBF FAQ
1.How can I place an order for LTC3615IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IFE#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 LTC3615IFE#PBF reliable?
The price and inventory of LTC3615IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615IFE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IFE#PBF?
LTC3615IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IFE#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 LTC3615IFE#PBF?
For technical support, including LTC3615IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IFE#PBF requirements.
6.How does Aetrix verify that LTC3615IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IFE#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 LTC3615IFE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615IFE#PBF?
All LTC3615IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IFE#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 LTC3615IFE#PBF part is unused and in its original packaging.
Return procedure for LTC3615IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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