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Analog Devices Inc. LTC3615IFE-1#TRPBF
- Part No.:
- LTC3615IFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615IFE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,538
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Product details
Overview
LTC3615IFE-1#TRPBF 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 140°/180° inter-channel phase shift. It features ±1% output voltage accuracy, 0.6V minimum output, and 2.25V–5.5V input range-optimized for single-cell Li-ion portable systems requiring compact, high-efficiency point-of-load regulation.
For engineers reviewing the LTC3615IFE-1#TRPBF datasheet, LTC3615IFE-1#TRPBF pinout, LTC3615IFE-1#TRPBF application, or LTC3615IFE-1#TRPBF equivalent, key selection criteria include confirmed 140°/180° phase shift capability (LTC3615-1 variant), internal/external compensation flexibility, DDR memory termination support via SRLIM = SVIN, and thermally enhanced TSSOP-24 package with exposed PGND pad.
Technical Context
The LTC3615IFE-1#TRPBF implements current-mode, constant-frequency control across two independent 3A channels sharing reference and clock circuits for tight output matching. Its architecture supports selectable Burst Mode® (130µA IQ), pulse-skipping, or forced continuous operation-each programmable via the MODE pin voltage level.
Phase shift between SW1 and SW2 is fixed at either 140° or 180° depending on PHASE pin voltage relative to SVIN, enabling optimized input ripple reduction in dual-output or 6A single-output configurations. Slew rate limiting at SW pins is externally adjustable via SRLIM resistor, and DDR mode activation requires SRLIM tied to SVIN-not available on LTC3615 (non-"-1") variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports direct connection to single Li-ion battery (2.7–4.2V) without pre-regulation. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A output with interleaved phase shift. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and reduces footprint in space-constrained designs. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core voltage for processors, FPGAs, and DDR memory interfaces. |
| Quiescent Current (Burst Mode) | 130µA - extends battery runtime in standby or low-power states without sacrificing regulation. |
| Phase Shift Options | 140° or 180° - reduces input capacitor RMS current by >30% vs. 0° in dual-channel operation. |
| Shutdown Current | ≤1µA - enables full system power gating for ultra-low leakage in always-on subsystems. |
| Feedback Reference Voltage | 0.6V ±1% - simplifies resistor-divider design and improves noise immunity at low VOUT. |
Pinout & Package
The LTC3615IFE-1#TRPBF is housed in a thermally enhanced 24-pin plastic eTSSOP (FE package) with exposed PGND pad (Pin 25), rated for –40°C to 125°C junction temperature. θJA = 33°C/W enables high-power operation with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (Pin 1) | Phase shift selection input | Selects 140° (PHASE = SGND) or 180° (PHASE = SVIN) inter-channel timing-no 0°/90° option on LTC3615-1 variant. |
| VFB1/VFB2 (Pins 2, 5) | Channel 1/2 feedback inputs | Monitor output voltage via external resistive divider; reference = 0.6V for precise regulation down to 0.6V. |
| ITH1/ITH2 (Pins 3, 6) | Error amplifier compensation nodes | Support internal compensation (tie to SVIN) or external RC network for stability tuning and AVP mode. |
| RUN1/RUN2 (Pins 11, 10) | Channel enable inputs | Active-high logic; pulling either RUNx low disables its channel; both low places device in <1µA shutdown. |
| RT/SYNC (Pin 12) | Oscillator/synchronization input | Set frequency via resistor-to-GND (400kHz–4MHz), synchronize to external clock ≤4MHz, or tie to SVIN for 2.25MHz default. |
| SRLIM (Pin 14) | Slew rate and DDR mode control | Tie to SVIN to enable DDR termination mode (IOUT = ±1.5A); resistor-to-SGND adjusts dV/dt on SW pins to reduce EMI. |
| PGND (Pin 25) | Power ground (exposed pad) | Mandatory PCB solder connection; serves as common source node for both N-channel sync switches and primary thermal path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external catch diodes, reduces BOM count, and improves efficiency up to 94% at full load. |
| 140°/180° phase-selectable outputs | Minimizes input capacitor stress and EMI in dual-channel configurations-specific to LTC3615-1 family. |
| Programmable slew rate limiting | Reduces radiated emissions without compromising transient response; adjustable via SRLIM resistor. |
| DDR memory termination mode | Enables ±1.5A sourcing/sinking capability with automatic tracking-activated only when SRLIM = SVIN. |
| Three operating modes via MODE pin | Single-pin selection of Burst Mode (130µA IQ), pulse-skipping (lower ripple), or forced continuous (sinking required). |
| 100% duty cycle low-dropout operation | Maintains regulation as VIN approaches VOUT-critical for battery end-of-discharge in portable systems. |
Applications
| Portable Computer Systems | DDR Memory Termination |
|---|---|
Use Scenario: Powering CPU core, GPU, and I/O rails in ultrabooks and tablets using single-cell Li-ion battery. IC Role / Device Role / Timing Role: Dual-channel step-down regulator delivering 1.8V/3A and 2.5V/3A with interleaved phase to minimize input ripple. Use Value: 94% peak efficiency and 130µA no-load IQ extend battery life; 140°/180° phase shift reduces input cap size by 40% vs. in-phase operation. | Use Scenario: Providing dynamic VTT termination for DDR3/DDR4 memory subsystems with bidirectional current capability. IC Role / Device Role / Timing Role: Configured in DDR mode (SRLIM = SVIN) to source/sink ±1.5A while tracking main VDDQ rail during read/write transitions. Use Value: Eliminates need for discrete termination ICs; ±1% output accuracy ensures JEDEC-compliant VTT tolerance (±15mV at 0.75V). |
| Point-of-Load Supplies | Handheld Devices |
Use Scenario: Local regulation for FPGA I/O banks, ADC/DAC analog supplies, and sensor interface rails in industrial edge devices. IC Role / Device Role / Timing Role: High-frequency (up to 4MHz) dual buck delivering tightly regulated 1.2V and 3.3V from shared 3.3V or 5V intermediate bus. Use Value: Small 4.4mm × 6.6mm TSSOP package fits dense PCB layouts; external compensation enables optimization for ceramic output caps. | Use Scenario: Power management in smartphones, wearables, and medical handhelds where board space and thermal performance are critical. IC Role / Device Role / Timing Role: Primary PMIC for application processor core, memory, and peripheral rails-leveraging Burst Mode for sleep-state efficiency. Use Value: 130µA quiescent current in Burst Mode extends standby time; 100% duty cycle maintains VOUT down to VIN = VOUT + 0.1V. |
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 |
|---|---|---|---|
| LTC3615EFE-1#TRPBF | Same electrical specs and pinout; rated for 0°C to 85°C operating junction temperature (vs. –40°C to 125°C for LTC3615IFE-1#TRPBF). | Not suitable for extended-temperature industrial or automotive under-hood applications. | Select when cost sensitivity outweighs wide-temperature requirement and ambient conditions remain within commercial range. |
| TPS543320RJER | 3A dual buck with 1.2MHz fixed frequency, no phase-shift selection, and integrated MOSFETs-but lacks DDR mode and programmable slew rate. | Lower component count but higher EMI and no bidirectional DDR termination capability. | Choose for simpler, lower-cost designs where 140°/180° phase shift and DDR compliance are not required. |
Compared with LTC3615EFE-1#TRPBF, the LTC3615IFE-1#TRPBF provides guaranteed performance across –40°C to 125°C, essential for industrial and extended-temperature deployments; versus TPS543320RJER, it delivers superior EMI control via slew rate programming and unique DDR termination functionality-making it irreplaceable in memory-intensive portable systems.
Availability
LTC3615IFE-1#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature operation.
Supply support for LTC3615IFE-1#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) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and power conversion markets.
The LTC3615/LTC3615-1 product line was designed specifically for high-density, high-efficiency dual-output DC/DC conversion in battery-powered and thermally constrained applications-emphasizing low IQ, phase interleaving, and DDR compliance.
FAQ
What is the maximum supported switching frequency for the LTC3615IFE-1#TRPBF?
The LTC3615IFE-1#TRPBF supports an adjustable switching frequency up to 4MHz via the RT/SYNC pin-either through an external resistor (400kHz–4MHz range) or synchronization to an external clock signal. At 4MHz, it enables use of ultra-small inductors (<0.47µH) and minimizes solution footprint for space-critical designs.
Does the LTC3615IFE-1#TRPBF support DDR memory termination mode?
Yes, the LTC3615IFE-1#TRPBF supports DDR memory termination mode when the SRLIM pin is tied to SVIN. This configures the device for ±1.5A sourcing/sinking capability with accurate tracking-enabling compliant VTT regulation for DDR3/DDR4 memory interfaces without external components.
How does the phase shift configuration differ between LTC3615 and LTC3615IFE-1#TRPBF?
The LTC3615IFE-1#TRPBF (LTC3615-1 variant) supports only 140° or 180° phase shift between channels-selected by the PHASE pin voltage-whereas the base LTC3615 offers 0°, 90°, or 180°. This 140° option is optimized for reduced input ripple in dual 3A configurations and is exclusive to the "-1" family.
What is the guaranteed operating temperature range for the LTC3615IFE-1#TRPBF?
The LTC3615IFE-1#TRPBF is specified and guaranteed to operate across a junction temperature range of –40°C to 125°C. This industrial-grade rating ensures reliable performance in demanding environments such as portable computing, industrial handhelds, and embedded systems with limited airflow.
Can the LTC3615IFE-1#TRPBF operate with 100% duty cycle for low-dropout applications?
Yes, the LTC3615IFE-1#TRPBF supports true 100% duty cycle operation, allowing VOUT to remain regulated even when VIN drops to within ~100mV of the output voltage. This feature extends usable battery life in single-cell Li-ion systems by maximizing discharge depth before brownout.
LTC3615IFE-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-1#TRPBF FAQ
1.How can I place an order for LTC3615IFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IFE-1#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 LTC3615IFE-1#TRPBF reliable?
The price and inventory of LTC3615IFE-1#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615IFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615IFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IFE-1#TRPBF?
LTC3615IFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IFE-1#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 LTC3615IFE-1#TRPBF?
For technical support, including LTC3615IFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3615IFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IFE-1#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 LTC3615IFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615IFE-1#TRPBF?
All LTC3615IFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IFE-1#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 LTC3615IFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615IFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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