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Analog Devices Inc. LTC3615MPFE#TRPBF
- Part No.:
- LTC3615MPFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615MPFE#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,071
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Product details
Overview
LTC3615MPFE#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 0°/90°/180° inter-channel phase shift, 100% duty cycle low-dropout operation, and Burst Mode® quiescent current of 130µA - optimized for Li-ion-powered portable computing and DDR memory termination.
For engineers reviewing the LTC3615MPFE#TRPBF datasheet, LTC3615MPFE#TRPBF pinout, LTC3615MPFE#TRPBF application, or LTC3615MPFE#TRPBF equivalent, key selection criteria include dual 3A PoL capability, –55°C to 150°C extended temperature grade, programmable slew rate limiting for EMI control, and selectable forced continuous/pulse-skipping/Burst Mode operation with internal or external compensation.
Technical Context
The LTC3615MPFE#TRPBF implements a current-mode, constant-frequency architecture with shared clock and reference circuits to ensure tight channel-to-channel matching. Each channel integrates matched P-channel high-side and N-channel synchronous rectifier MOSFETs (75mΩ/55mΩ RDS(ON) at 3.3V), enabling up to 94% peak efficiency and eliminating external catch diodes.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), while MODE pin configures operating mode (Burst, pulse-skipping, or forced continuous). Internal soft-start (0.65–1.7ms), accurate tracking, and DDR memory mode (±1.5A sinking) are supported - all validated across its full –55°C to 150°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery operation with undervoltage lockout at 2.25V (rising) and 1.7V (falling). |
| Output Current per Channel | 3A continuous - enables dual 3A point-of-load supplies or single 6A configuration with interleaved phase shift. |
| Output Voltage Accuracy | ±1% over –55°C to 150°C - ensures stable regulation for precision analog and memory subsystems. |
| Quiescent Current (Burst Mode) | 130µA - maintains regulated outputs at no load while minimizing battery drain in standby. |
| Switching Frequency Range | 400kHz to 4MHz - programmable via RT/SYNC resistor or external clock; enables use of sub-1µH inductors. |
| Phase Shift Options | 0°, 90°, or 180° - reduces input ripple and output voltage ripple in dual-output or parallel configurations. |
| Shutdown Current | ≤1µA - fully disables both channels and minimizes system-level leakage during deep sleep. |
Pinout & Package
The LTC3615MPFE#TRPBF is housed in a 24-lead plastic eTSSOP (FE package) with exposed PGND pad (Pin 25) requiring PCB soldering for thermal and electrical performance. θJA = 33°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PHASE (Pin 1) | Phase shift selection input | 0° (SGND), 90° (SVIN/2), or 180° (SVIN) inter-channel timing alignment for ripple reduction. |
| VFB1/VFB2 (Pins 2,5) | Feedback voltage inputs | Monitor output voltage via resistive divider; reference is 0.6V ±1% over full temperature range. |
| ITH1/ITH2 (Pins 3,6) | Error amplifier compensation nodes | Accept external RC network or tie to SVIN for internal compensation and AVP mode. |
| RUN1/RUN2 (Pins 11,10) | Channel enable inputs | Logic-high (>1V) enables respective channel; both low places device in <1µA shutdown. |
| RT/SYNC (Pin 12) | Oscillator frequency control | Resistor-to-ground sets fSW; external clock synchronizes up to 4MHz with automatic slope compensation. |
| SRLIM (Pin 14) | Slew rate limit control | Tied to SGND → max slew; open → min slew; tied to SVIN → max slew + DDR mode activation. |
| PGOOD1/PGOOD2 (Pins 15,13) | Open-drain power-good indicators | Pulled low if VFBx deviates >±7.5% from setpoint or RUNx is inactive. |
| PGND (Pin 25) | Power ground | Exposed thermal pad; must be soldered to PCB plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck topology | Eliminates external diodes and reduces BOM count; integrated 75mΩ/55mΩ MOSFETs deliver >94% efficiency at 3A. |
| Programmable inter-channel phase shift | 0°/90°/180° selection minimizes input capacitor RMS current and output voltage ripple in dual or parallel configurations. |
| Burst Mode® operation with 130µA IQ | Maintains regulation at light loads while reducing switching losses - critical for battery runtime extension. |
| 100% duty cycle low-dropout capability | Extends usable battery life by sustaining regulation as input voltage approaches output voltage (e.g., 1.8V out from 2.25V in). |
| DDR memory termination support | SRLIM = SVIN enables ±1.5A sinking capability and dynamic tracking for DDR2/DDR3 VTT rails. |
| –55°C to 150°C guaranteed operation | Qualified for harsh environments including industrial, avionics, and extended-temperature embedded systems. |
Applications
| Point-of-Load Supplies | Distributed Power Supplies |
|---|---|
Use Scenario: Providing tightly regulated 1.2V/1.8V/2.5V rails to FPGA core, I/O, and auxiliary logic in compact industrial controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering independent 3A outputs with precise tracking and low noise. Use Value: Enables single-chip dual-rail generation with <±1% accuracy and 130µA no-load IQ - reducing board area and thermal load vs discrete solutions. | Use Scenario: Powering multiple subsystems (CPU, memory, peripherals) from a common 3.3V or 5V intermediate bus in telecom base stations. IC Role / Device Role / Timing Role: Interleaved dual buck controller minimizing input ripple and improving transient response across distributed loads. Use Value: 180° phase shift cuts input capacitor RMS current by ~30%, allowing smaller, lower-cost bulk capacitance. |
| Portable Computer Systems | DDR Memory Termination |
Use Scenario: Supplying core voltage (VDDQ) and memory I/O voltage (VDDIO) in ultrabooks and tablets powered by single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency dual buck converter operating from 2.25–5.5V input with Burst Mode for extended standby time. Use Value: 94% peak efficiency and 130µA quiescent current directly extend battery life without compromising dynamic performance. | Use Scenario: Generating and regulating DDR2/DDR3 VTT termination rail requiring ±1.5A bidirectional current capability. IC Role / Device Role / Timing Role: Synchronous buck with DDR mode activated via SRLIM = SVIN, supporting active voltage positioning and fast sink response. Use Value: Eliminates need for external op-amp and discrete FETs; achieves ±1.5A sinking with <100ns turn-on for memory bus signal integrity. |
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#TRPBF | Same silicon, rated for –40°C to 125°C junction temperature (vs –55°C to 150°C for MP grade). | Not qualified for extended-temperature industrial or aerospace deployments requiring –55°C startup or 150°C sustained operation. | Select when ambient conditions stay within commercial/industrial ranges and cost sensitivity outweighs extended temp needs. |
| LTC3615-1MPFE#TRPBF | Same package and temp grade, but fixed 140°/180° phase shift (vs 0°/90°/180° in LTC3615MPFE#TRPBF). | Lacks 0° and 90° phase options - limits flexibility in input ripple optimization for certain multi-rail layouts. | Choose only if 140°/180° phase alignment meets system EMI and layout constraints; not drop-in compatible for 0°/90° designs. |
Compared with LTC3615EFE#TRPBF, the LTC3615MPFE#TRPBF delivers guaranteed operation down to –55°C and up to 150°C, making it suitable for mission-critical environments; versus LTC3615-1MPFE#TRPBF, it offers broader phase-shift flexibility (0°/90°/180°) for optimal input/output ripple management in dual-output systems.
Availability
LTC3615MPFE#TRPBF is available at Aetrix Electronics and suitable for point-of-load supplies, DDR memory termination, and portable computer systems requiring stable component supply across extreme temperature ranges and long production lifecycles.
Supply support for LTC3615MPFE#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 high-performance power management portfolio, emphasizing reliability, precision, and ruggedized operation for demanding applications.
The LTC3615 product line was designed for high-density, high-efficiency dual-output DC/DC conversion in space-constrained, thermally challenging environments - especially where battery life, thermal resilience, and rail accuracy are critical.
FAQ
What is the operating temperature range guaranteed for the LTC3615MPFE#TRPBF?
The LTC3615MPFE#TRPBF is tested and guaranteed to meet all specifications over a junction temperature range of –55°C to 150°C. This extended grade supports applications in aerospace, industrial control, and automotive under-hood environments where standard commercial or industrial grades would fail. The device uses the same die as the LTC3615 family but undergoes additional screening and characterization to validate performance across this full range.
Does the LTC3615MPFE#TRPBF support DDR memory termination with sinking current capability?
Yes, the LTC3615MPFE#TRPBF supports DDR memory termination when the SRLIM pin is tied to SVIN, enabling DDR mode with ±1.5A bidirectional current capability. In this mode, the device actively sinks current from the VTT rail during memory bus transitions, maintaining tight voltage regulation without external components. This functionality is explicitly specified and tested for the LTC3615MPFE#TRPBF across its full temperature range.
How is phase shift configured between the two channels of the LTC3615MPFE#TRPBF?
Phase shift between SW1 and SW2 in the LTC3615MPFE#TRPBF is configured using the PHASE pin (Pin 1): tying it to SGND selects 0°, applying SVIN/2 selects 90°, and connecting it to SVIN selects 180°. These settings are valid for the LTC3615 variant (not LTC3615-1), and all three options are fully characterized and guaranteed for the MP-grade part across –55°C to 150°C.
What are the key differences between Burst Mode®, pulse-skipping, and forced continuous modes on the LTC3615MPFE#TRPBF?
The LTC3615MPFE#TRPBF supports three distinct light-load operating modes via the MODE pin: Burst Mode® (MODE = SGND) minimizes IQ to 130µA by disabling internal circuitry between bursts; pulse-skipping (MODE = SVIN) skips cycles without disabling bias, improving ripple at higher IQ; forced continuous (MODE = 1.1V to 0.58×SVIN) sustains switching at all loads, enabling sinking current and lowest output ripple. All modes are functional across the full –55°C to 150°C range.
Can the LTC3615MPFE#TRPBF be synchronized to an external clock, and what is the maximum frequency?
Yes, the LTC3615MPFE#TRPBF can be synchronized to an external clock applied to the RT/SYNC pin (Pin 12), with full compatibility up to 4MHz. The internal slope compensation automatically adapts to the external frequency, ensuring stable current-mode operation. Minimum high/low pulse widths are 30ns, and logic thresholds are 1.2V (high) and 0.3V (low), making it compatible with standard CMOS clock sources across the device's operating temperature range.
LTC3615MPFE#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#TRPBF FAQ
1.How can I place an order for LTC3615MPFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615MPFE#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#TRPBF reliable?
The price and inventory of LTC3615MPFE#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3615MPFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615MPFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615MPFE#TRPBF?
LTC3615MPFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615MPFE#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#TRPBF?
For technical support, including LTC3615MPFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615MPFE#TRPBF requirements.
6.How does Aetrix verify that LTC3615MPFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3615MPFE#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3615MPFE#TRPBF?
All LTC3615MPFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615MPFE#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3615MPFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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