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Analog Devices Inc. LTC3615EUF#TRPBF
- Part No.:
- LTC3615EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615EUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3615EUF#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 at up to 4MHz switching frequency and supporting 2.25V–5.5V input voltage. It integrates dual high-efficiency power MOSFETs, offers selectable phase shift (0°/90°/180°), and delivers ±1% output voltage accuracy down to 0.6V - optimized for point-of-load regulation in portable Li-ion systems.
For engineers reviewing the LTC3615EUF#TRPBF datasheet, LTC3615EUF#TRPBF pinout, LTC3615EUF#TRPBF application, or LTC3615EUF#TRPBF equivalent, key selection criteria include dual 3A current capability, programmable slew rate limiting for EMI control, internal/external compensation flexibility, Burst Mode® operation with 130µA no-load IQ, and QFN-24 (4mm × 4mm) thermal performance with exposed PGND pad.
Technical Context
The LTC3615EUF#TRPBF implements a current-mode, constant-frequency architecture with independent error amplifiers and ITH-based peak-current control per channel. Its dual-phase operation supports 0°, 90°, or 180° inter-channel phase shift via the PHASE pin, minimizing input ripple in dual-output configurations or enabling single 6A output with interleaved timing.
It features three distinct operating modes selected by the MODE pin: Burst Mode® (130µA IQ), pulse-skipping, and forced continuous mode - the latter required for bidirectional current handling (e.g., DDR termination). Internal 0.6V reference, ±1% VFB accuracy, and 100% duty cycle capability support low-dropout operation critical for battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and regulated 3.3V/5V rails. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL supplies or interleaved 6A output without external current sharing. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| No-Load Quiescent Current | 130µA in Burst Mode® - extends battery runtime in standby or light-load states. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core/DSP/memory rail regulation across industrial range. |
| Feedback Reference Voltage | 0.6V (typical) - sets minimum output to 0.6V with standard resistor dividers; supports AVP and tracking. |
| Shutdown Current | ≤1µA - enables full system power gating with negligible leakage. |
| Phase Shift Options | 0°, 90°, or 180° - reduces input capacitor RMS current and output voltage ripple via channel interleaving. |
Pinout & Package
The LTC3615EUF#TRPBF is housed in a thermally enhanced 24-pin (4mm × 4mm) plastic QFN package with exposed PGND pad (Pin 25), requiring soldering to PCB 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; drives internal P/N-MOSFET pair; requires low-inductance layout. |
| VFB1 / VFB2 | Feedback input for Channel 1 / 2 | Monitors output voltage via resistive divider; references internal 0.6V bandgap. |
| ITH1 / ITH2 | Error amplifier compensation node | Controls peak inductor current; ties to SVIN for AVP or external RC for custom loop response. |
| RUN1 / RUN2 | Enable input for Channel 1 / 2 | Active-high logic; <0.4V disables, >1V enables; both low places device in <1µA shutdown. |
| PHASE | Inter-channel phase select | 0° (SGND), 90° (SVIN/2), or 180° (SVIN) - configures interleaving for ripple reduction. |
| SRLIM | Slew rate limit / DDR mode control | Tied to SGND → max slew; open → min slew; tied to SVIN → DDR mode + max slew. |
| MODE | Operating mode selector | SGND → Burst Mode®; SVIN → pulse-skipping; 1.1V–0.58×SVIN → forced continuous (required for sinking). |
| RT/SYNC | Oscillator frequency control | Resistor-to-GND sets fSW (400kHz–4MHz); driven clock synchronizes up to 4MHz. |
| TRACK/SS1 / TRACK/SS2 | Soft-start / tracking input | Enables internal soft-start (tied to SVIN), external RC timing, or supply tracking for rail sequencing. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low if VOUT deviates >±7.5% or RUNx is inactive; requires external pull-up. |
| PVIN1 / PVIN2 | Channel 1 / 2 power input | Independent high-side MOSFET source pins; may be connected to lower voltage than SVIN. |
| SVIN | Signal supply input | Powers internal bias circuits; monitored for UVLO (2.25V turn-on, 1.7V turn-off). |
| SGND | Signal ground reference | Reference for feedback, compensation, and control circuitry; must connect to PGND at single point. |
| PGND | Power ground (exposed pad) | Common source node for bottom N-MOSFETs; thermal path to PCB; must be soldered. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Eliminates external catch diodes and reduces BOM count; achieves up to 94% efficiency at 3A. |
| Programmable slew rate limiting | Reduces EMI emissions via adjustable edge rates on SW1/SW2; configurable via SRLIM resistor. |
| Selectable 0°/90°/180° phase shift | Minimizes input capacitor RMS current and output voltage ripple in dual- or single-output configurations. |
| Burst Mode® operation with 130µA IQ | Maintains regulation at light loads while disabling non-essential circuitry to maximize battery life. |
| DDR memory termination support | Enabled when SRLIM = SVIN; provides ±1.5A sink/source capability with accurate AVP tracking. |
| 100% duty cycle low-dropout operation | Extends usable battery voltage range by maintaining regulation as input approaches output voltage. |
Applications
| Point-of-Load Regulation | Portable Computer Systems |
|---|---|
Use Scenario: Regulating CPU core voltage (1.0–1.3V) and SoC I/O rail (1.8V) from a shared 3.3V intermediate bus in ultrabooks. IC Role / Device Role / Timing Role: Dual-channel synchronous buck converter delivering precise, low-noise, sequenced outputs with independent soft-start and tracking. Use Value: Enables compact, high-efficiency dual-rail generation with <130µA quiescent current during sleep states and <1% output error across temperature. | Use Scenario: Powering display backlight drivers and USB-C PD interface controllers in tablets with tight thermal constraints. IC Role / Device Role / Timing Role: Primary DC/DC regulator supplying 5V and 3.3V rails from single Li-ion cell; supports dynamic voltage scaling via MODE pin. Use Value: Delivers 3A per rail with 4MHz switching to minimize inductor size, while Burst Mode® extends standby time beyond 72 hours. |
| DDR Memory Termination | Handheld Devices |
Use Scenario: Providing VTT termination for DDR3/DDR4 memory subsystems requiring bidirectional ±1.5A current sourcing/sinking. IC Role / Device Role / Timing Role: Configured in DDR mode (SRLIM = SVIN) with forced continuous operation to maintain fast transient response and tight voltage positioning. Use Value: Achieves active voltage positioning (AVP) with internal compensation, eliminating need for external op-amps and reducing layout complexity. | Use Scenario: Supplying RF transceiver bias (2.8V) and baseband processor core (1.1V) in LTE-enabled wearables with aggressive size targets. IC Role / Device Role / Timing Role: Dual-output buck converter operating from 3.6V nominal Li-ion; uses phase-shifted interleaving to reduce EMI in sensitive RF bands. Use Value: Meets CISPR-22 Class B radiated emission limits without shielding, thanks to programmable slew rate and 180° phase alignment. |
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 |
|---|---|---|---|
| TPS652860RGER | Single 6A output (not dual 3A); fixed 2.2MHz fSW; no phase shift; integrated LDOs. | Best for space-constrained single-rail designs where dual independent outputs are unnecessary. | Choose only if dual independent regulation, phase control, or DDR sinking capability is not required. |
| ISL9123IRZ-T7A | Single 3A output; 2.5MHz fSW; no phase shift; lower IQ (25µA) but no Burst Mode®; smaller 2mm × 2mm WLCSP. | Targeted at ultra-low-power microcontroller rails where dual outputs and high current are not needed. | Select when footprint and ultra-low IQ outweigh need for dual 3A channels or DDR support. |
Compared with TPS652860RGER and ISL9123IRZ-T7A, the LTC3615EUF#TRPBF uniquely supports true dual independent 3A outputs with programmable phase shift, DDR sinking, and Burst Mode® - making it the only option among the three suitable for high-performance, multi-rail portable systems requiring tight regulation and EMI control.
Availability
LTC3615EUF#TRPBF is available at Aetrix Electronics and suitable for point-of-load supplies, DDR memory termination, and handheld device power management requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LTC3615EUF#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 its precision analog and power management portfolio with rigorous qualification and long-term product support.
The LTC3615EUF#TRPBF belongs to Linear's high-frequency monolithic DC/DC converter family, designed specifically for compact, high-efficiency power delivery in battery-operated and space-constrained systems demanding low IQ, fast transient response, and flexible sequencing.
FAQ
What is the maximum supported switching frequency for the LTC3615EUF#TRPBF?
The LTC3615EUF#TRPBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin - either using a resistor-to-ground or an external clock signal. At 4MHz, it enables use of very small inductors (e.g., 0.47µH) and low-ESR ceramic capacitors, ideal for ultra-compact layouts in portable devices. The internal oscillator defaults to 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3615EUF#TRPBF support DDR memory termination?
Yes, the LTC3615EUF#TRPBF supports DDR memory termination when configured in DDR mode: tie SRLIM to SVIN and operate in forced continuous mode (MODE pin at 1.1V–0.58×SVIN). In this configuration, it delivers ±1.5A sink/source capability with active voltage positioning (AVP), meeting JEDEC-compliant VTT requirements for DDR3/DDR4 without external components.
What package type and thermal characteristics does the LTC3615EUF#TRPBF have?
The LTC3615EUF#TRPBF uses a 24-pin 4mm × 4mm plastic QFN package (UF grade) with exposed PGND pad (Pin 25). Its thermal resistance is θJA = 37°C/W under standard JEDEC 2-layer board conditions. The exposed pad must be soldered to a thermal pad on the PCB to ensure proper heat dissipation and electrical grounding for the power MOSFET sources.
How does phase shift work between the two channels of the LTC3615EUF#TRPBF?
Phase shift between SW1 and SW2 in the LTC3615EUF#TRPBF is controlled by the PHASE pin: 0° when tied to SGND, 90° when biased at ~½ SVIN, and 180° when tied to SVIN. This interleaving reduces input capacitor RMS current by up to 70% and output voltage ripple in dual-output configurations - critical for noise-sensitive analog or RF subsystems.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous mode on the LTC3615EUF#TRPBF?
The MODE pin selects operation: Burst Mode® (MODE = SGND) minimizes IQ to 130µA by disabling circuitry between bursts; 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 DDR sinking and best transient response. Each mode trades off efficiency, ripple, and functionality.
LTC3615EUF#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)
LTC3615EUF#TRPBF FAQ
1.How can I place an order for LTC3615EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615EUF#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 LTC3615EUF#TRPBF reliable?
The price and inventory of LTC3615EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615EUF#TRPBF?
LTC3615EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615EUF#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 LTC3615EUF#TRPBF?
For technical support, including LTC3615EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615EUF#TRPBF requirements.
6.How does Aetrix verify that LTC3615EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615EUF#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 LTC3615EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615EUF#TRPBF?
All LTC3615EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615EUF#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 LTC3615EUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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