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Analog Devices Inc. LTC3615IUF-1#TRPBF
- Part No.:
- LTC3615IUF-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615IUF-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,716
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Product details
Overview
LTC3615IUF-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC with independent 3A per channel capability, operating at up to 4MHz switching frequency and supporting 140°/180° inter-channel phase shift. It features ±1% output voltage accuracy, 0.6V minimum output, and 100% duty cycle low-dropout operation-designed for high-efficiency point-of-load regulation in space-constrained battery-powered systems such as portable computers and DDR memory supplies.
For engineers reviewing the LTC3615IUF-1#TRPBF datasheet, LTC3615IUF-1#TRPBF pinout, LTC3615IUF-1#TRPBF application, or LTC3615IUF-1#TRPBF equivalent, this page delivers verified technical context, confirmed pin functions, real-world efficiency vs. load data, validated alternative options, and supply-chain-ready availability details-no generic descriptions or inferred specs.
Technical Context
The LTC3615IUF-1#TRPBF implements current-mode, constant-frequency control across two fully independent buck regulators sharing a synchronized clock and reference. Its PHASE pin selects 140° or 180° phase shift between SW1 and SW2 to minimize input ripple in dual-output configurations or enable single 6A output with interleaved operation.
It supports three operating modes via the MODE pin: Burst Mode (with internal or external clamp), pulse-skipping, and forced continuous mode-with the latter required for bidirectional current handling (e.g., DDR sink capability). Internal compensation and optional active voltage positioning (AVP) are enabled by tying ITHx to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - enables direct use with single-cell Li-ion batteries without pre-regulation. |
| Output Current per Channel | 3A continuous - supports dual-core SoC rails or split DDR VTT/VDDQ supplies. |
| Switching Frequency | Up to 4MHz - allows sub-1µH inductors and compact PCB layouts in portable designs. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core voltage regulation under thermal stress. |
| Quiescent Current (Burst Mode) | 130µA - extends battery life in standby without sacrificing fast wake-up response. |
| Phase Shift Options | 140° or 180° - reduces input capacitor RMS current by >30% compared to 0° alignment. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level shutdown requirements. |
Pinout & Package
Package: 24-pin (4mm × 4mm) plastic QFN with exposed PGND pad (Pin 25), rated for –40°C to +125°C junction temperature. Thermal resistance θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / 2 switching node | Connects to external inductor; drives internal P/N-MOSFET pair; requires low-inductance layout. |
| VFB1 / VFB2 | Feedback input (channel 1 / 2) | Monitors output via resistor divider; sets regulated voltage with 0.6V internal reference. |
| ITH1 / ITH2 | Error amplifier compensation node | Controls peak current limit; tie to SVIN to enable AVP and internal compensation. |
| RUN1 / RUN2 | Enable input (channel 1 / 2) | Active-high logic; <0.4V disables channel; >1V enables; both low = full shutdown (<1µA). |
| PHASE | Inter-channel phase selection | SGND = 140°, SVIN = 180° - critical for optimizing input/output ripple in dual-rail systems. |
| SRLIM | Slew rate control / DDR mode enable | Tied to SVIN → enables DDR sink mode (±1.5A); resistor-to-SGND adjusts EMI-reducing slew rate. |
| RT/SYNC | Frequency programming / sync input | Resistor-to-GND sets fSW; external clock up to 4MHz synchronizes both channels. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Pulled low if VOUT deviates >±7.5% or RUNx is inactive - used for sequencing and fault reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck architecture | Eliminates external catch diodes; achieves up to 94% efficiency at 3A, reducing board area and thermal load. |
| Programmable 140°/180° phase shift | Reduces input capacitor RMS current by ≥35% in dual-output mode, enabling smaller ceramic input caps. |
| Burst Mode with 130µA IQ | Maintains regulation during light loads while minimizing battery drain-critical for always-on subsystems. |
| 100% duty cycle low-dropout operation | Extends runtime in battery-powered systems as input voltage decays near output level. |
| DDR memory termination support | Enables ±1.5A sink/source via SRLIM = SVIN and forced continuous mode-meets JEDEC DDR3/4 VTT specs. |
| Internal/external compensation flexibility | ITHx tied to SVIN activates AVP and internal compensation; external RC network allows custom loop tuning. |
Applications
| Portable Computer Core Rails | DDR Memory Termination (VTT) |
|---|---|
|
Use Scenario: Powering dual-core CPU/GPU voltage domains in ultrabooks and tablets with tight thermal and size constraints. IC Role / Device Role / Timing Role: Dual-channel buck regulator delivering independent 1.0V/1.8V rails with precise tracking and fast transient response. Use Value: 94% peak efficiency and 130µA quiescent current extend battery life; 4MHz operation enables 0.47µH inductors and <100mm² total solution size. |
Use Scenario: Providing bidirectional termination for DDR3/DDR4 memory buses requiring ±1.5A sink/source capability. IC Role / Device Role / Timing Role: Synchronous buck configured in forced continuous mode with SRLIM = SVIN to meet JEDEC VTT compliance. Use Value: Eliminates need for discrete op-amp + MOSFET VTT solutions; integrated current sensing and AVP ensure tight ±1% VTT regulation. |
| Point-of-Load for FPGA I/O Banks | Distributed Power in Industrial Handhelds |
|
Use Scenario: Delivering clean, sequenced 1.2V/1.8V/2.5V supplies to FPGA I/O banks with strict noise and sequencing requirements. IC Role / Device Role / Timing Role: Dual regulator with TRACK/SS1/SS2 pins enabling precise power-up/down sequencing across multiple rails. Use Value: Internal soft-start and external tracking eliminate need for external sequencers; ±1% accuracy ensures signal integrity at high-speed interfaces. |
Use Scenario: Powering mixed-signal subsystems (MCU, display, RF) in ruggedized handheld test equipment with wide ambient temperature range. IC Role / Device Role / Timing Role: Robust dual buck converter rated for –40°C to +125°C operation, supporting 2.25–5.5V input from primary battery or USB-C PD source. Use Value: 100% duty cycle operation maintains regulation down to 0.6V input drop; low EMI slew rate limiting meets Class B emissions standards. |
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 |
|---|---|---|---|
| TPS54383RTER | Fixed 3.3V/1.2V dual outputs; no programmable phase shift; max fSW = 1.2MHz; no DDR sink mode. | Best for cost-sensitive, fixed-voltage applications where layout space is less constrained. | Select when dual fixed outputs suffice and 4MHz switching is unnecessary. |
| ISL85415IRZ-T7A | Single 5A channel; no dual-output or phase-shift capability; supports 4.5–60V input; higher voltage range. | Suitable for industrial 12–48V input systems, not battery-powered low-VIN designs. | Choose only for wide-input industrial supplies-not a functional replacement for LTC3615IUF-1#TRPBF's dual-channel topology. |
Compared with TPS54383RTER and ISL85415IRZ-T7A, the LTC3615IUF-1#TRPBF uniquely delivers dual 3A channels with 140°/180° phase shift, 4MHz programmability, and integrated DDR sink capability-making it irreplaceable for high-density, battery-operated, multi-rail systems requiring dynamic efficiency and precision regulation.
Availability
LTC3615IUF-1#TRPBF is available at Aetrix Electronics and suitable for portable computing, DDR memory termination, and industrial handheld device designs requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3615IUF-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 and maintains full product support, datasheets, and design tools for legacy Linear parts including the LTC3615 series.
The LTC3615IUF-1#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, engineered specifically for space- and power-constrained portable and embedded systems demanding dual-rail flexibility, low IQ, and robust thermal performance.
FAQ
What is the key difference between LTC3615IUF-1#TRPBF and the standard LTC3615IUF#TRPBF?
The LTC3615IUF-1#TRPBF implements 140°/180° phase shift between channels, whereas the standard LTC3615IUF#TRPBF supports 0°/90°/180°. This distinction is defined by internal mask ROM and affects PHASE pin behavior-140° is selected when PHASE = SGND. Both share identical package, pinout, and electrical specs otherwise.
Does LTC3615IUF-1#TRPBF support DDR memory termination with sink current capability?
Yes. When SRLIM is tied to SVIN and MODE is set for forced continuous mode, the LTC3615IUF-1#TRPBF enables ±1.5A sink/source operation on either channel-meeting JEDEC-compliant DDR3/DDR4 VTT requirements without external components.
What is the maximum achievable switching frequency for LTC3615IUF-1#TRPBF?
The LTC3615IUF-1#TRPBF supports up to 4MHz switching frequency-either via external synchronization signal applied to RT/SYNC or by selecting an appropriate RT resistor value. At 4MHz, typical operation uses 0.22µH–0.47µH inductors and low-ESR ceramic capacitors.
How does the PHASE pin configure inter-channel timing in LTC3615IUF-1#TRPBF?
In the LTC3615IUF-1#TRPBF, PHASE = SGND selects 140° phase shift; PHASE = SVIN selects 180°. Unlike the base LTC3615, the 90° option is not available. This configuration directly impacts input ripple cancellation and must be matched to input capacitor selection.
Is external compensation required for stable operation of LTC3615IUF-1#TRPBF?
No. The LTC3615IUF-1#TRPBF supports both internal and external compensation. Tying ITH1 or ITH2 to SVIN enables internal compensation and Active Voltage Positioning (AVP), simplifying design for standard loads. External RC networks are optional for custom loop shaping or high-transient applications.
LTC3615IUF-1#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN 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-QFN (4x4)
LTC3615IUF-1#TRPBF FAQ
1.How can I place an order for LTC3615IUF-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IUF-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 LTC3615IUF-1#TRPBF reliable?
The price and inventory of LTC3615IUF-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 LTC3615IUF-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615IUF-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IUF-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IUF-1#TRPBF?
LTC3615IUF-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IUF-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 LTC3615IUF-1#TRPBF?
For technical support, including LTC3615IUF-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IUF-1#TRPBF requirements.
6.How does Aetrix verify that LTC3615IUF-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IUF-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 LTC3615IUF-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615IUF-1#TRPBF?
All LTC3615IUF-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IUF-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 LTC3615IUF-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615IUF-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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