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Analog Devices Inc. LTC3615MPUF#PBF
- Part No.:
- LTC3615MPUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615MPUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
LTC3615MPUF#PBF 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 features ±1% output voltage accuracy, 0.6V minimum output, and 100% duty cycle low-dropout operation - ideal for point-of-load regulation in battery-powered portable computers and DDR memory termination.
For engineers reviewing the LTC3615MPUF#PBF datasheet, LTC3615MPUF#PBF pinout, LTC3615MPUF#PBF application, or LTC3615MPUF#PBF equivalent, key selection criteria include its –55°C to 150°C extended temperature grade, QFN-24 (4mm × 4mm) thermally enhanced package, dual-channel phase-shift control, programmable slew rate limiting, and selectable Burst/Pulse-Skipping/Forced Continuous modes.
Technical Context
The LTC3615MPUF#PBF implements current-mode, constant-frequency control across two identical monolithic buck regulators sharing clock and reference circuits for tight channel-to-channel matching. Its internal P-channel high-side and N-channel synchronous rectifier switches eliminate external diodes and support bidirectional current flow in Forced Continuous Mode.
Phase shift between SW1 and SW2 is selected via the PHASE pin (0°/90°/180°), while MODE pin configuration determines operating mode - including Burst Mode with internal clamp (MODE = SGND), external-clamp Burst (0.5V–0.85V), Pulse-Skipping (MODE = SVIN), or Forced Continuous (1.1V–0.58×SVIN). SRLIM pin enables adjustable slew rate or DDR mode activation when tied to SVIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion battery input without external LDO pre-regulation. |
| Output Current per Channel | 3A continuous - enables dual 3A PoL or combined 6A single-output configurations with phase interleaving. |
| Switching Frequency | Up to 4MHz - allows use of sub-1µH inductors and compact ceramic output capacitors. |
| Feedback Accuracy | ±1% over –55°C to 150°C - ensures stable voltage regulation across military/aerospace thermal extremes. |
| Quiescent Current | 130µA in Burst Mode at no load - extends battery runtime in always-on portable systems. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level sleep requirements. |
| Output Voltage Range | 0.6V to VIN - supports core logic, I/O, and DDR memory rails with precise low-voltage regulation. |
Pinout & Package
The LTC3615MPUF#PBF is housed in a 24-pin, 4mm × 4mm plastic QFN package (UF) with exposed PGND pad (Pin 25) requiring PCB soldering 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; carries high di/dt current - requires short, low-inductance PCB routing. |
| VFB1 / VFB2 | Feedback input for channel 1 / 2 | Monitors output voltage via resistor divider; sets regulated output with ±1% accuracy. |
| ITH1 / ITH2 | Error amplifier compensation node | Controls peak inductor current; tie to SVIN to enable Active Voltage Positioning (AVP) with internal compensation. |
| RUN1 / RUN2 | Enable input for channel 1 / 2 | Logic-high (>1V) enables respective channel; both low disables entire IC with ≤1µA shutdown current. |
| PHASE | Inter-channel phase shift select | 0° (SGND), 90° (½×SVIN), or 180° (SVIN) - reduces input ripple and EMI in dual-output designs. |
| SRLIM | Slew rate limit / DDR mode control | Adjusts switch edge rate to reduce EMI; tied to SVIN enables DDR memory sinking capability (±1.5A). |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low if output deviates >±7.5% from setpoint or channel is disabled - used for sequencing and fault reporting. |
| TRACK/SS1 / TRACK/SS2 | Soft-start / tracking input | Enables internal soft-start (tied to SVIN), external RC timing, or supply tracking for controlled power-up sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck architecture | Eliminates external catch diodes, reduces BOM count and board area versus discrete solutions. |
| Programmable 0°/90°/180° phase shift | Minimizes input capacitor RMS current and output voltage ripple in dual-channel configurations. |
| Selectably adjustable slew rate | Reduces EMI emissions without sacrificing efficiency - critical for EMC-compliant portable designs. |
| Active Voltage Positioning (AVP) | Internal compensation with ITH tied to SVIN enables dynamic VOUT droop under load for improved transient response. |
| DDR memory termination mode | When SRLIM = SVIN, supports ±1.5A sink/source for DDR3/DDR4 VTT rails with accurate tracking. |
Applications
| Point-of-Load Regulation | Distributed Power Systems |
|---|---|
Use Scenario: Regulating 1.8V/3A and 2.5V/3A rails for FPGA I/O banks and core logic in industrial embedded controllers. IC Role / Device Role / Timing Role: Dual-channel synchronous buck regulator delivering tightly regulated, phase-interleaved outputs with <1% output error across –55°C to 150°C. Use Value: Enables compact, thermally efficient power delivery without external MOSFETs or diodes - reducing solution size by >30% vs discrete controllers. | Use Scenario: Providing isolated, sequenced 1.2V and 3.3V supplies in multi-rail telecom base station boards. IC Role / Device Role / Timing Role: Dual independent buck controller with TRACK/SS pins enabling precise power-up/down sequencing between rails. Use Value: Eliminates need for external sequencing ICs; internal soft-start and tracking ensure glitch-free startup across wide temperature range. |
| Portable Computing | DDR Memory Termination |
Use Scenario: Powering CPU core and GPU voltage domains in ruggedized tablet PCs operating from single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency dual buck converter with 130µA Burst Mode IQ and 100% duty cycle dropout for maximum battery runtime. Use Value: Delivers >94% peak efficiency at full load and maintains regulation down to 2.25V input - extending usable battery capacity. | Use Scenario: Generating matched ±1.5A VTT termination for DDR4 memory subsystems in servers and workstations. IC Role / Device Role / Timing Role: DDR mode enabled via SRLIM = SVIN; provides bidirectional current sourcing/sinking with fast transient response. Use Value: Meets JEDEC DDR4 VTT accuracy specs (±3%) without external op-amps or current mirrors - simplifying layout and improving reliability. |
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 |
|---|---|---|---|
| LTC3615HUF#PBF | Same silicon, rated for –40°C to 150°C (vs –55°C to 150°C); no extended low-temp validation. | Not qualified for cryogenic or space-grade applications requiring –55°C operation. | Select LTC3615MPUF#PBF when full military-grade temperature compliance is mandatory. |
| LTC3615-1MPUF#PBF | Supports 140°/180° phase shift (vs 0°/90°/180°); otherwise identical electrical specs and package. | Optimized for asymmetric phase interleaving where 140° minimizes input ripple in specific dual-3A layouts. | Choose LTC3615-1MPUF#PBF only if 140° phase alignment is required for EMI reduction in your PCB stackup. |
Compared with LTC3615HUF#PBF and LTC3615-1MPUF#PBF, the LTC3615MPUF#PBF uniquely combines –55°C start-up capability with full 0°/90°/180° phase flexibility - making it the sole option for extended-temperature portable systems requiring maximum design margin and layout adaptability.
Availability
LTC3615MPUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, distributed power systems, and DDR memory termination requiring stable component supply across extreme environmental conditions.
Supply support for LTC3615MPUF#PBF 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, datasheets, and application engineering for all Linear-branded ICs including the LTC3615 series.
The LTC3615 product line was designed for high-density, high-efficiency DC/DC conversion in space-constrained, thermally demanding applications - especially portable computing, telecom infrastructure, and industrial control systems requiring extended temperature operation.
FAQ
What is the operating temperature range of the LTC3615MPUF#PBF?
The LTC3615MPUF#PBF is tested and guaranteed over –55°C to 150°C junction temperature, making it suitable for military, aerospace, and harsh-environment industrial applications where standard commercial or industrial grades fail. This extended range is validated per Linear Technology's MP (military plastic) qualification standard, not derated or extrapolated.
Does the LTC3615MPUF#PBF support DDR memory termination?
Yes, the LTC3615MPUF#PBF supports DDR memory termination when the SRLIM pin is tied to SVIN, enabling ±1.5A bidirectional current sourcing and sinking per channel. This mode is explicitly documented in the datasheet's Applications Information section and verified across the full –55°C to 150°C range.
What package type and thermal performance does the LTC3615MPUF#PBF use?
The LTC3615MPUF#PBF uses a 24-pin, 4mm × 4mm plastic QFN (UF) package with exposed PGND pad (Pin 25). Its thermal resistance is θJA = 37°C/W when mounted on a standard 4-layer PCB with 2 in² copper pour under the exposed pad - enabling 3A/channel operation without forced air cooling.
How is phase shift configured between the two channels of the LTC3615MPUF#PBF?
Phase shift between SW1 and SW2 is set by the voltage on the PHASE pin: 0° when tied to SGND, 90° when biased to ½×SVIN, and 180° when tied to SVIN. This selection is confirmed in the Pin Functions section and applies identically across all LTC3615 variants including the MP grade.
Can the LTC3615MPUF#PBF operate with input voltage below 2.25V?
No - the absolute minimum input voltage for the LTC3615MPUF#PBF is 2.25V as specified in the Electrical Characteristics table. Operation below this threshold triggers undervoltage lockout (UVLO), disabling regulation. The 100% duty cycle feature only applies above UVLO threshold and does not extend operational range below 2.25V.
LTC3615MPUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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)
LTC3615MPUF#PBF FAQ
1.How can I place an order for LTC3615MPUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615MPUF#PBF 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 LTC3615MPUF#PBF reliable?
The price and inventory of LTC3615MPUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615MPUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615MPUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615MPUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615MPUF#PBF?
LTC3615MPUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615MPUF#PBF 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 LTC3615MPUF#PBF?
For technical support, including LTC3615MPUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615MPUF#PBF requirements.
6.How does Aetrix verify that LTC3615MPUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615MPUF#PBF 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 LTC3615MPUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615MPUF#PBF?
All LTC3615MPUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615MPUF#PBF, 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 LTC3615MPUF#PBF part is unused and in its original packaging.
Return procedure for LTC3615MPUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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