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Analog Devices Inc. LTC3615MPFE-1#TRPBF
- Part No.:
- LTC3615MPFE-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615MPFE-1#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,648
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Product details
Overview
LTC3615MPFE-1#TRPBF from Analog Devices (formerly Linear Technology) is a dual-channel, 3A synchronous step-down DC/DC converter in thermally enhanced 24-pin TSSOP package, operating from 2.25V to 5.5V input and delivering two independent 3A outputs with ±1% output voltage accuracy down to 0.6V. It supports 140°/180° inter-channel phase shift, 4MHz max switching frequency, and Burst Mode operation achieving 130µA quiescent current - optimized for Li-ion-powered portable computing and DDR memory termination.
For engineers reviewing the LTC3615MPFE-1#TRPBF datasheet, LTC3615MPFE-1#TRPBF pinout, LTC3615MPFE-1#TRPBF application, or LTC3615MPFE-1#TRPBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, selectable 140°/180° phase shift for ripple reduction, internal/external compensation flexibility, DDR mode support via SRLIM pin, and low dropout 100% duty cycle capability.
Technical Context
The LTC3615MPFE-1#TRPBF implements current-mode, constant-frequency control with dual independent channels sharing a common oscillator and reference for tight channel-to-channel matching. Its architecture integrates P-channel high-side and N-channel synchronous rectifier MOSFETs, eliminating external catch diodes and enabling high efficiency up to 94%.
Phase shift between SW1 and SW2 is digitally selected via the PHASE pin (0.0V → 140°, SVIN → 180°), distinct from the LTC3615's 0°/90°/180° options. The MODE pin configures four operating modes: Burst Mode (SGND), Pulse-Skipping (SVIN), Forced Continuous (1.1V–0.58×SVIN), or externally clamped Burst Mode (0.5V–0.8V), with ITH pin voltage directly controlling peak inductor current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery operation across full discharge curve. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or single 6A interleaved configuration with phase shift. |
| Output Voltage Accuracy | ±1% over –55°C to 150°C - ensures stable regulation under extreme industrial and aerospace thermal conditions. |
| Quiescent Current (Burst Mode) | 130µA - extends battery runtime in always-on portable systems without sacrificing regulation. |
| Switching Frequency Range | 400kHz to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Phase Shift Options | 140° or 180° - reduces input current ripple by >70% in dual-output configurations vs. 0° alignment. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level sleep requirements. |
Pinout & Package
Package: 24-lead plastic eTSSOP (FE), 4.4mm × 7.8mm body, exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical integrity. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (Pin 1) | Phase shift selection input | 0V → 140° shift; SVIN → 180° shift - critical for optimizing input capacitor RMS current in dual-channel designs. |
| VFB1/VFB2 (Pins 2,5) | Feedback input for Channel 1/2 | Monitors output voltage via resistor divider; sets regulation point at 0.6V reference with ±1% tolerance. |
| ITH1/ITH2 (Pins 3,6) | Error amplifier compensation node | Controls peak inductor current; tied to SVIN enables Active Voltage Positioning (AVP) for DDR applications. |
| TRACK/SS1/SS2 (Pins 4,7) | Soft-start and tracking input | Enables programmable start-up timing or supply sequencing with external voltage sources. |
| SGND (Pin 8) | Signal ground reference | Separate from PGND - must connect small-signal components here and tie to PGND at single point to avoid noise coupling. |
| PVIN1/PVIN2 (Pins 9–10, 11–12) | Channel 1/2 power input | Independent inputs allow different input rails per channel; rated to SVIN + 0.3V. |
| SW1/SW2 (Pins 13–14, 15–16) | Switching node outputs | Connect to external inductors; slew rate programmable via SRLIM pin to reduce EMI. |
| RUN1/RUN2 (Pins 17,18) | Channel enable inputs | Logic-high (>1V) enables respective channel; both low forces full shutdown (<1µA IQ). |
| RT/SYNC (Pin 19) | Oscillator frequency control | Resistor-to-GND sets fSW; external clock up to 4MHz synchronizes switching; tied to SVIN → 2.25MHz default. |
| PGOOD1/PGOOD2 (Pins 20,21) | Open-drain power-good indicators | Assert low if VOUT deviates >±7.5% or RUNx is inactive - used for system sequencing and fault reporting. |
| SRLIM (Pin 22) | Slew rate and DDR mode control | Tied to SVIN enables DDR sink-current mode and adjusts switch edge rate to balance EMI vs. efficiency. |
| MODE (Pin 23) | Operating mode selection | Selects Burst, Pulse-Skipping, Forced Continuous, or externally clamped Burst Mode - determines light-load behavior and ripple profile. |
| SVIN (Pin 24) | Signal supply input | Powers internal circuitry and hosts UVLO (2.25V turn-on); must be decoupled locally with ≥1µF ceramic capacitor. |
| PGND (Pin 25) | Power ground return | Exposed thermal pad - mandatory solder connection to large PCB copper area for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external Schottky diodes, reduces BOM count, and improves efficiency by >5% vs. asynchronous designs at 3A load. |
| 140°/180° selectable inter-channel phase shift | Minimizes input capacitor RMS current in dual-output configurations - enables smaller, lower-cost input bulk capacitors. |
| Programmable slew rate on SW pins | Reduces EMI emissions by >10dB in 30–100MHz band without compromising efficiency or transient response. |
| DDR memory termination mode | Enables ±1.5A sink/source capability via SRLIM = SVIN and ITH = SVIN - meets JEDEC DDR3/DDR4 VTT requirements. |
| –55°C to 150°C guaranteed operation | Qualified for extended-temperature industrial, avionics, and downhole applications without derating or qualification overhead. |
| Internal/external compensation flexibility | Supports fast transient response with external Type-II/III compensation or simplified layout with internal AVP compensation. |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
Use Scenario: Providing tightly regulated 1.8V and 2.5V rails to FPGA I/O banks and core logic in space-constrained embedded controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering independent 3A outputs with precise tracking and sequencing. Use Value: Eliminates need for two discrete converters, reduces board area by 35%, and maintains ±1% output accuracy across –55°C to 150°C ambient. |
Use Scenario: Powering CPU cores and memory subsystems in ruggedized tablets operating from single Li-ion battery (2.8V–4.2V). IC Role / Device Role / Timing Role: Primary DC/DC converter managing dynamic load steps up to 3A/µs while maintaining <20mV output deviation. Use Value: 130µA Burst Mode IQ extends battery life by 2.1× vs. fixed-frequency alternatives; 100% duty cycle sustains operation down to 2.25V input. |
| DDR Memory Termination | Industrial Distributed Power |
Use Scenario: Generating matched ±1.5A VTT supply for DDR3L memory in base station control cards. IC Role / Device Role / Timing Role: DDR mode-enabled buck converter providing active sink/source termination with AVP for dynamic voltage positioning. Use Value: Meets JEDEC DDR3L VTT accuracy (±2%) and transient response specs without external op-amps or discrete FETs. |
Use Scenario: Supplying isolated 3.3V and 5V rails to sensor nodes and PLC I/O modules in factory automation systems. IC Role / Device Role / Timing Role: Dual-output regulator with 180° phase shift reducing input ripple on shared 5V backplane. Use Value: Enables use of 1206-size 4.7µF X7R ceramics instead of larger tantalum caps; qualified for 15-year field life at 125°C junction. |
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 |
|---|---|---|---|
| LTC3615EFE-1#TRPBF | Same functionality but rated for –40°C to 125°C; lower cost; no extended temperature screening. | Suitable for commercial/industrial environments without extreme thermal cycling or storage requirements. | Select when full –55°C qualification is unnecessary and BOM cost is prioritized over extended reliability margin. |
| TPS65270PWP | Dual 3A buck with fixed 500kHz/1MHz frequencies; no programmable phase shift; higher 250µA IQ in skip mode. | Lacks 140°/180° phase option and DDR sink capability; simpler layout but less flexible for high-efficiency portable designs. | Choose for cost-sensitive, non-battery applications where 4MHz switching and advanced light-load modes are not required. |
Compared with LTC3615EFE-1#TRPBF, the LTC3615MPFE-1#TRPBF adds guaranteed operation down to –55°C and 150°C, essential for aerospace and military deployments; versus TPS65270PWP, it delivers superior light-load efficiency, finer frequency control, and DDR-specific features at the cost of greater design complexity.
Availability
LTC3615MPFE-1#TRPBF is available at Aetrix Electronics and suitable for point-of-load regulation, portable computing power, and DDR memory termination requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3615MPFE-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 its precision analog and power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3615MPFE-1#TRPBF belongs to Linear's high-efficiency monolithic DC/DC converter family, designed specifically for demanding portable, industrial, and communications applications requiring dual-output flexibility, ultra-low quiescent current, and extended temperature resilience.
FAQ
What is the operating temperature range of the LTC3615MPFE-1#TRPBF?
The LTC3615MPFE-1#TRPBF is fully tested and guaranteed to operate from –55°C to 150°C junction temperature, making it suitable for aerospace, downhole, and extended-temperature industrial applications where standard commercial or industrial grade parts would fail. This rating is verified per Analog Devices' MP-grade qualification protocol, including temperature cycling and long-term life testing.
How does the LTC3615MPFE-1#TRPBF differ from the standard LTC3615MPFE#TRPBF?
The LTC3615MPFE-1#TRPBF implements the LTC3615-1 variant, supporting only 140° or 180° inter-channel phase shift (selected via PHASE pin voltage), whereas the LTC3615MPFE#TRPBF supports 0°, 90°, or 180°. All other electrical specifications, package, and temperature rating are identical between the two MP-grade parts.
Can the LTC3615MPFE-1#TRPBF be used for DDR memory termination?
Yes - the LTC3615MPFE-1#TRPBF supports DDR mode when SRLIM is tied to SVIN and ITH is tied to SVIN, enabling ±1.5A sink/source capability with Active Voltage Positioning. This meets JEDEC DDR3/DDR4 VTT requirements for dynamic termination without external components, confirmed in the device's Applications Information section.
What is the minimum input voltage required for the LTC3615MPFE-1#TRPBF to regulate?
The LTC3615MPFE-1#TRPBF maintains regulation down to 2.25V input due to its undervoltage lockout threshold of 2.25V (rising) and 100% duty cycle capability. Below 2.25V, the device disables; above 2.25V, it operates with dropout as low as VOUT + (ILOAD × RDS(ON)), enabling extended runtime in deeply discharged Li-ion systems.
Does the LTC3615MPFE-1#TRPBF require external compensation components?
No - the LTC3615MPFE-1#TRPBF supports both internal and external compensation. Tying ITH1/ITH2 to SVIN enables internal compensation with Active Voltage Positioning, simplifying layout. For optimized transient response or custom loop shaping, external RC networks can be connected from ITH to SGND per the compensation guidelines in the datasheet.
LTC3615MPFE-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
LTC3615MPFE-1#TRPBF FAQ
1.How can I place an order for LTC3615MPFE-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615MPFE-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 LTC3615MPFE-1#TRPBF reliable?
The price and inventory of LTC3615MPFE-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 LTC3615MPFE-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615MPFE-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615MPFE-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615MPFE-1#TRPBF?
LTC3615MPFE-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615MPFE-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 LTC3615MPFE-1#TRPBF?
For technical support, including LTC3615MPFE-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615MPFE-1#TRPBF requirements.
6.How does Aetrix verify that LTC3615MPFE-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615MPFE-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 LTC3615MPFE-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615MPFE-1#TRPBF?
All LTC3615MPFE-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615MPFE-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 LTC3615MPFE-1#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615MPFE-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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