My Inquiry
My Account
Analog Devices Inc. LTC3615IUF#TRPBF
- Part No.:
- LTC3615IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615IUF#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3615IUF#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 0°/90°/180° inter-channel phase shift. It delivers ±1% output voltage accuracy down to 0.6V, features 130µA quiescent current in Burst Mode, and supports 2.25V–5.5V input for single Li-Ion battery systems - used in point-of-load regulation for DDR memory and portable computing power rails.
For engineers reviewing the LTC3615IUF#TRPBF datasheet, LTC3615IUF#TRPBF pinout, LTC3615IUF#TRPBF application, or LTC3615IUF#TRPBF equivalent, key selection criteria include dual 3A output capability with programmable phase shift, low-noise Burst Mode operation, internal/external compensation flexibility, and QFN-24 thermal performance for high-density PCB layouts.
Technical Context
The LTC3615IUF#TRPBF implements a current-mode, constant-frequency control architecture with independent error amplifiers and ITH-based peak-current programming per channel. Its dual-channel design shares reference and clock circuits to ensure tight output matching, while selectable phase shift (0°/90°/180°) minimizes input ripple in dual-output configurations or enables 6A single-output operation.
It integrates synchronous P-channel and N-channel MOSFETs (75mΩ/55mΩ RDS(ON) at 3.3V), supports 100% duty-cycle low-dropout operation, and offers three operating modes - Burst Mode (130µA IQ), Pulse-Skipping, and Forced Continuous - selected via the MODE pin with external voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-Ion and regulated intermediate bus supplies. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A output with phase interleaving. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable core/memory rail regulation without post-regulation trimming. |
| Quiescent Current (Burst Mode) | 130µA - extends battery runtime in standby or light-load states without sacrificing regulation. |
| Phase Shift Options | 0°, 90°, or 180° - reduces input capacitor RMS current by up to 70% in dual-channel operation. |
| Shutdown Current | ≤1µA - enables full system power gating for ultra-low-power sleep states. |
| Feedback Reference Voltage | 0.6V ±1% - simplifies resistor-divider design and improves noise immunity at low VOUT. |
Pinout & Package
Package: 24-pin (4mm × 4mm) plastic QFN with exposed PGND pad (Pin 25), rated θJA = 37°C/W. Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / 2 switching node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance routing. |
| VFB1 / VFB2 | Feedback input for channel 1 / 2 | Monitors output voltage via resistive divider; sets regulation point at 0.6V reference. |
| ITH1 / ITH2 | Error amplifier compensation node | Controls peak inductor current; ties to SVIN for AVP mode or external RC for custom loop response. |
| RUN1 / RUN2 | Enable input for channel 1 / 2 | Logic-high (>1V) enables respective channel; both low disables entire IC with ≤1µA shutdown current. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low when output deviates >±7.5% from target - used for sequencing and fault monitoring. |
| PHASE | Inter-channel phase shift select | 0° (SGND), 90° (½SVIN), or 180° (SVIN) - configures ripple cancellation topology. |
| SRLIM | Slew rate limit / DDR mode enable | Tied to SVIN enables DDR termination mode; resistor-to-SGND adjusts switch edge rate to reduce EMI. |
| RT/SYNC | Oscillator frequency control | Resistor-to-GND sets fSW; external clock syncs up to 4MHz; tied to SVIN selects 2.25MHz internal oscillator. |
| TRACK/SS1 / TRACK/SS2 | Soft-start / tracking input | Enables internal soft-start (tied to SVIN), external RC timing, or supply tracking for coordinated rail ramp-up. |
| PVIN1 / PVIN2 | Power input for channel 1 / 2 | Independent inputs allow separate input sources or local bulk capacitance per channel. |
| SVIN | Signal supply and UVLO monitor | Powers control circuitry; triggers undervoltage lockout below 2.25V (rising) or 1.7V (falling). |
| MODE | Operating mode selection | 0.3V = Burst Mode (internal clamp); SVIN = Pulse-Skipping; 1.1V–0.58×SVIN = Forced Continuous. |
| SGND | Signal ground reference | Reference for feedback, compensation, and logic pins - must connect to PGND at single point. |
| PGND (Pin 25) | Power ground return | Exposed pad connects to sources of internal NMOS switches - mandatory PCB thermal via connection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Eliminates external catch diodes, reduces BOM count, and improves efficiency up to 94% at full load. |
| Programmable 0°/90°/180° phase shift | Reduces input capacitor RMS current and EMI in dual-output designs without additional controller ICs. |
| Burst Mode with 130µA IQ | Maintains tight output regulation at microamp loads while minimizing battery drain in portable devices. |
| 100% duty cycle low-dropout operation | Extends usable battery life by sustaining regulated output as input voltage falls near VOUT. |
| Flexible mode selection via MODE pin | Single-pin configuration of Burst, Pulse-Skipping, or Forced Continuous modes - no external logic required. |
| DDR memory termination support | SRLIM = SVIN activates DDR-specific timing and current-sinking capability for VTT/VREF rails. |
Applications
| DDR Memory Termination | Portable Computer Core Rails |
|---|---|
Use Scenario: Regulating VTT and VREF rails for DDR3/DDR4 memory subsystems requiring bidirectional current sourcing/sinking. IC Role / Device Role / Timing Role: Dual-channel buck converter delivering ±1.5A symmetric current with fast transient response and AVP support. Use Value: Enables precise DDR termination voltage tracking and active voltage positioning without external op-amps or discrete FETs. | Use Scenario: Powering CPU/GPU core voltages (e.g., 1.0V–1.35V) and SoC I/O rails (1.8V/2.5V) in ultrabooks and tablets. IC Role / Device Role / Timing Role: Primary point-of-load regulator with independent soft-start and power-good signaling for safe rail sequencing. Use Value: Delivers 3A per rail with <1% output error and <200mV load-step deviation - meets Intel IMVP-7/8 compliance margins. |
| Distributed Power Architecture | Li-Ion Powered Handheld Devices |
Use Scenario: Local regulation from a 5V or 3.3V intermediate bus to multiple low-voltage rails in industrial gateways or network equipment. IC Role / Device Role / Timing Role: Dual-output DC/DC converter with phase-shifted operation to minimize input filter size and heat generation. Use Value: Reduces input capacitor count by 50% vs. non-interleaved dual converters - saves board space and cost. | Use Scenario: Direct conversion from single-cell Li-Ion (2.7V–4.2V) to 1.8V and 2.5V system rails in medical monitors or barcode scanners. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent buck regulator enabling >12-hour battery life in always-on operation. Use Value: 130µA Burst Mode IQ and 94% peak efficiency extend runtime while maintaining ±1% output stability across battery discharge curve. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543320RTVR | Single 6A output (not dual 3A); uses D-CAP3 control; fixed 500kHz–2.2MHz range; no phase-shift option. | Best for single-rail high-current apps; lacks independent channel control and DDR sinking capability. | Select when needing higher single-rail current and simpler layout - not suitable for independent dual-rail sequencing. |
| MP2491DS-LF-Z | Dual 2A outputs; 2.2MHz fixed frequency; no programmable phase shift; 200µA IQ in skip mode; no DDR mode. | Lower current rating and missing AVP/DDR features limit use in memory-intensive designs. | Consider for cost-sensitive, lower-power applications where 3A/channel and DDR support are unnecessary. |
Compared with TPS543320RTVR and MP2491DS-LF-Z, the LTC3615IUF#TRPBF uniquely provides independently controllable 3A dual channels with 0°/90°/180° phase shift, DDR termination mode, and 130µA Burst Mode IQ - making it optimal for space-constrained, multi-rail, battery-powered systems requiring precision regulation and minimal input ripple.
Availability
LTC3615IUF#TRPBF is available at Aetrix Electronics and suitable for point-of-load supplies, DDR memory termination, and portable computer systems requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for LTC3615IUF#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3615 product line was designed specifically for high-efficiency, high-density point-of-load DC/DC conversion in battery-powered and thermally constrained systems - emphasizing low IQ, phase interleaving, and flexible mode control.
FAQ
What is the maximum switching frequency supported by the LTC3615IUF#TRPBF?
The LTC3615IUF#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 space-constrained portable designs. The internal oscillator defaults to 2.25MHz when RT/SYNC is tied to SVIN.
Does the LTC3615IUF#TRPBF support DDR memory termination with current sinking capability?
Yes, the LTC3615IUF#TRPBF supports DDR memory termination when the SRLIM pin is tied to SVIN, activating DDR mode. In this mode, it delivers ±1.5A output current with fast transient response and active voltage positioning (AVP), enabling compliant VTT and VREF rail regulation for DDR3/DDR4 systems without external components.
How does phase shift selection work on the LTC3615IUF#TRPBF, and what benefit does it provide?
The PHASE pin on the LTC3615IUF#TRPBF selects inter-channel phase shift: 0° (PHASE = SGND), 90° (PHASE = ½SVIN), or 180° (PHASE = SVIN). This interleaving reduces input capacitor RMS current by up to 70%, lowers EMI, and allows smaller input filtering - critical for high-current dual-rail designs like CPU core + I/O supplies.
What are the operating modes available on the LTC3615IUF#TRPBF, and how is each selected?
The LTC3615IUF#TRPBF offers four operating modes selected via the MODE pin voltage: Burst Mode (MODE = SGND, 130µA IQ), Pulse-Skipping (MODE = SVIN), Forced Continuous (MODE = 1.1V to 0.58×SVIN), and external-clamp Burst Mode (MODE = 0.5V–0.8V). Each mode balances light-load efficiency, output ripple, and transient response for specific application needs.
What package type and thermal characteristics apply to the LTC3615IUF#TRPBF?
The LTC3615IUF#TRPBF uses a 24-pin 4mm × 4mm plastic QFN package (UF) with exposed PGND pad (Pin 25). Its thermal resistance is θJA = 37°C/W under standard JEDEC conditions. The exposed pad must be soldered to a thermal pad on the PCB to achieve rated performance and reliability - failure to do so degrades thermal dissipation and may trigger overtemperature protection.
LTC3615IUF#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#TRPBF FAQ
1.How can I place an order for LTC3615IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IUF#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#TRPBF reliable?
The price and inventory of LTC3615IUF#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IUF#TRPBF?
LTC3615IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IUF#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#TRPBF?
For technical support, including LTC3615IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IUF#TRPBF requirements.
6.How does Aetrix verify that LTC3615IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IUF#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615IUF#TRPBF?
All LTC3615IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IUF#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3615IUF#TRPBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
