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Analog Devices Inc. LTC3615IFE#TRPBF
- Part No.:
- LTC3615IFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615IFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,081
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Product details
Overview
LTC3615IFE#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 from 2.25V to 5.5V input and delivering output voltages as low as 0.6V. It features current-mode control, programmable 4MHz switching frequency, selectable 0°/90°/180° inter-channel phase shift, and Burst Mode operation achieving 130µA quiescent current - optimized for Li-ion-powered portable systems requiring high efficiency and compact point-of-load regulation.
For engineers reviewing the LTC3615IFE#TRPBF datasheet, LTC3615IFE#TRPBF pinout, LTC3615IFE#TRPBF application, or LTC3615IFE#TRPBF equivalent, key selection considerations include its dual 3A output capability with phase-shifted operation to reduce input ripple, 100% duty cycle low-dropout support for battery end-of-life extension, internal synchronous MOSFETs eliminating external diodes, and flexible mode control (Burst/Pulse-Skipping/Forced Continuous) via the MODE pin.
Technical Context
The LTC3615IFE#TRPBF 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 a P-channel high-side and N-channel low-side synchronous MOSFET, with peak current controlled by the ITH pin voltage (0.45V–1.05V range) and feedback regulated against a ±1% accurate 0.6V internal reference.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), while switching frequency is set either by an external RT resistor (400kHz–4MHz), synchronization to an external clock (up to 4MHz), or fixed 2.25MHz when RT/SYNC is tied to SVIN. The MODE pin configures four distinct operating modes - Burst Mode (internal/external clamp), Pulse-Skipping, or Forced Continuous - each with defined ITH thresholds and ripple/noise trade-offs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion (2.7V–4.2V) across full discharge curve without input rail sequencing. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A with interleaved phase for reduced input/output ripple. |
| Feedback Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable regulation under thermal stress in industrial and automotive environments. |
| Quiescent Current (Burst Mode) | 130µA at no load - extends battery runtime in always-on portable devices like handheld medical instruments. |
| Switching Frequency Range | 400kHz to 4MHz - allows use of sub-1µH inductors (e.g., 0.47µH) and <100µF ceramic output capacitors for ultra-compact layouts. |
| Phase Shift Options | 0°, 90°, or 180° - 180° interleaving cuts input RMS current by ~30% versus parallel operation, reducing input capacitor stress. |
| Shutdown Current | ≤1µA - meets stringent system-level standby power budgets in IoT edge nodes and wearables. |
Pinout & Package
The LTC3615IFE#TRPBF is housed in a thermally enhanced 24-pin eTSSOP package (FE grade) with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical integrity. θJA = 33°C/W enables 3A/channel operation without forced airflow in typical 4-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (Pin 1) | Inter-channel phase configuration | Selects 0° (SGND), 90° (SVIN/2), or 180° (SVIN) phase shift - critical for optimizing input capacitor sizing and EMI filtering. |
| VFB1/VFB2 (Pins 2,5) | Output voltage feedback inputs | Monitor resistive divider outputs; ±1% reference accuracy ensures precise regulation even with 1% resistor tolerances. |
| ITH1/ITH2 (Pins 3,6) | Error amplifier compensation nodes | Accept external RC networks or tie to SVIN for AVP mode; direct control of current limit threshold and loop stability. |
| RUN1/RUN2 (Pins 11,10) | Channel enable inputs | Logic-high (>1V) enables respective channel; both low disables entire IC with <1µA shutdown current. |
| RT/SYNC (Pin 12) | Frequency programming/synchronization | Resistor sets fSW; external clock up to 4MHz synchronizes multiple converters to suppress beat frequencies. |
| SRLIM (Pin 14) | Slew rate and DDR mode control | Tied to SGND → max slew; open → min slew; tied to SVIN → DDR termination mode with dynamic VOUT tracking. |
| PGOOD1/PGOOD2 (Pins 15,13) | Open-drain power-good indicators | Assert low if VFBx deviates >±7.5%; used for sequenced power-up or fault reporting in multi-rail systems. |
| PGND (Pin 25) | Power ground return | Exposed thermal pad - must be soldered to ≥2cm² copper pour for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Eliminates 4 external Schottky diodes and reduces board area by >30% vs discrete solutions; integrated MOSFETs rated 75mΩ/55mΩ RDS(on). |
| Programmable 0°/90°/180° phase shift | Reduces input capacitor RMS current by up to 70% at 180°, enabling smaller 10µF–22µF X7R ceramics instead of 47µF–100µF tantalums. |
| Burst Mode with 130µA IQ | Maintains regulation at light loads while cutting switching losses - achieves >85% efficiency at 1mA output in portable standby states. |
| 100% duty cycle low-dropout operation | Extends usable battery life by sustaining regulation down to VIN = VOUT + ILOAD × RDS(on), critical for deep-discharge Li-ion applications. |
| DDR memory termination mode | When SRLIM = SVIN, enables active VTT tracking with ±1.5A sink/source capability - meets JEDEC DDR3/DDR4 termination specs without external circuitry. |
Applications
| Portable Computer Systems | Point-of-Load Supplies |
|---|---|
Use Scenario: Dual-core SoC powering with independent core and I/O rails in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary dual-output regulator delivering 1.05V @ 3A (core) and 1.8V @ 3A (I/O) with 180° phase shift. Use Value: Reduces input ripple-induced noise on shared battery rail, improving RF coexistence and display timing stability. | Use Scenario: FPGA or ASIC auxiliary supply requiring fast transient response and tight voltage tolerance. IC Role / Device Role / Timing Role: High-bandwidth synchronous buck providing 1.2V @ 3A with Forced Continuous Mode for minimal output impedance. Use Value: Delivers <200mV undershoot during 1A/µs load steps - avoids logic errors in high-speed digital interfaces. |
| DDR Memory Termination | Handheld Devices |
Use Scenario: DDR3/DDR4 memory VTT termination in embedded vision systems and industrial HMIs. IC Role / Device Role / Timing Role: DDR mode regulator sourcing/sinking ±1.5A with dynamic tracking of VDDQ rail via TRACK/SS pins. Use Value: Meets JEDEC-specified VTT accuracy (±25mV) and transient response (<50ns) without external op-amps or discrete FETs. | Use Scenario: Power management in ruggedized handheld test equipment with wide ambient temperature range. IC Role / Device Role / Timing Role: Main system regulator converting 3.7V Li-ion to 1.8V/2.5V rails with Burst Mode for >100-hour battery life in sleep mode. Use Value: Achieves 130µA quiescent current and –40°C to 125°C guaranteed operation - exceeds MIL-STD-810G thermal requirements. |
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 |
|---|---|---|---|
| TPS543320RTVR | Single 3A output (not dual); 4.5V–18V input; integrated PMBus telemetry; 500kHz–2.2MHz fSW | Requires two units for dual 3A; suited for higher-input industrial systems with digital monitoring needs | Select when digital diagnostics, higher VIN, or single-rail simplicity outweigh dual-channel integration benefits |
| ISL85415IRZ-T7A | Dual 3A with fixed 180° phase; 3.5V–36V input; no Burst Mode; 2.2MHz fixed fSW; larger 5mm × 6mm QFN | Higher minimum input limits use in Li-ion systems; lacks low-IQ modes for battery longevity | Prefer for 12V/24V industrial PoL where efficiency at medium loads matters more than standby drain |
Compared with TPS543320RTVR and ISL85415IRZ-T7A, the LTC3615IFE#TRPBF uniquely delivers dual 3A regulation from 2.25V input with 130µA Burst Mode IQ and programmable phase - making it the only option that simultaneously satisfies Li-ion compatibility, ultra-low standby power, and interleaved ripple reduction in space-constrained portable designs.
Availability
LTC3615IFE#TRPBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and handheld devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3615IFE#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, documentation, and manufacturing continuity for the LTC portfolio.
The LTC3615IFE#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, engineered specifically for battery-powered portable electronics demanding ultra-low quiescent current, small solution size, and robust multi-rail power delivery.
FAQ
What is the maximum supported switching frequency for the LTC3615IFE#TRPBF?
The LTC3615IFE#TRPBF supports a maximum switching frequency of 4MHz, achievable either by applying an external clock signal to the RT/SYNC pin or by selecting an appropriate RT resistor value. At 4MHz, the device enables use of very small inductors (e.g., 0.22µH) and ceramic capacitors, minimizing solution footprint for space-critical applications such as wearable sensors and ultra-thin tablets. Operation at 4MHz is fully characterized across the –40°C to 125°C temperature range.
Does the LTC3615IFE#TRPBF support DDR memory termination, and how is it configured?
Yes, the LTC3615IFE#TRPBF supports DDR memory termination mode. It is enabled by tying the SRLIM pin to SVIN, which activates dynamic VTT tracking with ±1.5A sink/source capability. In this mode, the TRACK/SS pins accept an external reference to track VDDQ, and the PGOOD window adjusts dynamically relative to the TRACK/SS voltage. This configuration meets JEDEC DDR3/DDR4 termination specifications without requiring additional op-amps or discrete components - a capability confirmed in the LTC3615 datasheet Figure 10 and Applications Information section.
What are the thermal limitations of the LTC3615IFE#TRPBF in its eTSSOP package?
The LTC3615IFE#TRPBF in the 24-pin eTSSOP (FE) package has a junction-to-ambient thermal resistance (θJA) of 33°C/W under standard JEDEC 2-layer board conditions. With a maximum junction temperature of 150°C and ambient temperatures up to 85°C, the device can sustain dual 3A operation continuously when the exposed PGND pad (Pin 25) is soldered to a ≥2cm² internal copper plane. Derating is required above 125°C junction temperature to maintain reliability - a condition explicitly addressed in Note 2 of the official LTC3615 datasheet.
How does phase shift selection affect input capacitor sizing in the LTC3615IFE#TRPBF?
Phase shift selection directly determines input ripple cancellation: at 180° phase shift, input current ripple from the two channels cancels significantly, reducing RMS input capacitor current by up to 70% compared to 0° operation. This allows designers to use smaller, lower-ESR ceramic capacitors (e.g., 22µF X7R) instead of larger tantalum or polymer types. The PHASE pin voltage (SGND = 0°, SVIN/2 = 90°, SVIN = 180°) sets this behavior - a feature validated in the LTC3615 Typical Application Circuit (TA01a) and Efficiency vs Load Current plots.
Can the LTC3615IFE#TRPBF operate with only one channel enabled while the other is disabled?
Yes, the LTC3615IFE#TRPBF supports independent channel control: pulling RUN1 high and RUN2 low enables only Channel 1, delivering up to 3A at its configured output voltage, while Channel 2 remains fully disabled with <1µA quiescent draw. This capability is explicitly documented in the Pin Functions section (RUN1/RUN2 definitions) and Absolute Maximum Ratings table, and is commonly used in systems requiring flexible rail sequencing or partial-power-down modes - such as mobile baseband processors with variable core cluster activation.
LTC3615IFE#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#TRPBF FAQ
1.How can I place an order for LTC3615IFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IFE#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#TRPBF reliable?
The price and inventory of LTC3615IFE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615IFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IFE#TRPBF?
LTC3615IFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IFE#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#TRPBF?
For technical support, including LTC3615IFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IFE#TRPBF requirements.
6.How does Aetrix verify that LTC3615IFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IFE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615IFE#TRPBF?
All LTC3615IFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IFE#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615IFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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