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Analog Devices Inc. LTC3615IFE-1#PBF
- Part No.:
- LTC3615IFE-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LTC3615IFE-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,732
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Product details
Overview
LTC3615IFE-1#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, 3A synchronous step-down DC/DC converter with 0°/140°/180° phase-shift capability, 2.25V–5.5V input range, and ±1% output voltage accuracy down to 0.6V - designed for high-efficiency point-of-load regulation in portable computing and DDR memory termination systems.
For engineers reviewing the LTC3615IFE-1#PBF datasheet, LTC3615IFE-1#PBF pinout, LTC3615IFE-1#PBF application, or LTC3615IFE-1#PBF equivalent, key selection criteria include confirmed 140°/180° phase shift (LTC3615-1 variant), 130µA no-load quiescent current in Burst Mode, 100% duty cycle low-dropout operation, and TSSOP-24 thermal performance (θJA = 33°C/W).
Technical Context
The LTC3615IFE-1#PBF implements current-mode, constant-frequency control across two independent 3A channels sharing synchronized clock and reference circuits. Its PHASE pin selects 140° or 180° inter-channel phase shift - distinct from the LTC3615's 0°/90°/180° options - minimizing input ripple in dual-output or single 6A configurations.
It supports three operating modes via the MODE pin: Burst Mode (with internal/external clamp), Pulse-Skipping, and Forced Continuous Mode (required for sinking current up to ±1.5A in DDR mode). Internal compensation is enabled by tying ITHx to SVIN, while external compensation allows fine-tuned loop response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - enables direct use with single-cell Li-ion batteries without pre-regulation. |
| Output Current per Channel | 3A continuous - supports dual 3A PoL rails or combined 6A output with phase interleaving. |
| Feedback Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable regulation under thermal stress in industrial/portable environments. |
| No-Load Quiescent Current | 130µA in Burst Mode - extends battery runtime in always-on subsystems. |
| Switching Frequency Range | 400kHz to 4MHz - permits use of sub-1µH inductors and compact ceramic output capacitors. |
| Phase Shift Options | 140° or 180° (LTC3615-1 variant only) - reduces input capacitor RMS current by up to 40% vs. in-phase operation. |
| Shutdown Current | ≤1µA - meets ultra-low-power system standby requirements. |
Pinout & Package
Package: 24-pin plastic eTSSOP (FE package), 4mm × 6.5mm 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 configuration input | Selects 140° (PHASE < 0.65×SVIN) or 180° (PHASE > 0.85×SVIN) between SW1/SW2 - critical for ripple cancellation in dual-channel layout. |
| SW1/SW2 (Pins 16–17 / 8–9) | Channel 1/2 switching nodes | Connect to external inductors; integrate synchronous P/N-MOSFETs - eliminates external catch diodes and reduces board area. |
| VFB1/VFB2 (Pins 23 / 2) | Output voltage feedback inputs | Monitor regulated outputs via resistive dividers; reference is 0.6V ±1% - sets precise output voltage (e.g., 1.8V, 2.5V) with minimal error. |
| RT/SYNC (Pin 12) | Oscillator frequency control | Accepts resistor-to-ground (400kHz–4MHz), external clock (up to 4MHz), or SVIN for fixed 2.25MHz - enables EMI optimization and system clock synchronization. |
| RUN1/RUN2 (Pins 11 / 10) | Channel enable inputs | Logic-level control (VIH ≥ 1V, VIL ≤ 0.4V); pulling both low disables converter and reduces supply current to ≤1µA. |
| PGOOD1/PGOOD2 (Pins 15 / 13) | Open-drain power-good indicators | Assert low if output deviates >±7.5% from setpoint or RUNx is inactive - provides sequencing and fault monitoring for downstream logic. |
| SRLIM (Pin 14) | Slew rate and DDR mode control | Tied to SVIN enables DDR termination mode (IOUT = ±1.5A); resistor-to-SGND adjusts switch edge rate to balance EMI vs. efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck architecture | Integrates high-side P-MOSFET and low-side N-MOSFET per channel - eliminates external diodes, improves efficiency to 94%, and reduces BOM count. |
| 140°/180° selectable phase shift (LTC3615-1) | Reduces input capacitor RMS current and peak input ripple in dual-output designs - enables smaller, lower-cost bulk capacitance. |
| Programmable operating modes (Burst/Pulse-Skipping/Forced Continuous) | Optimizes light-load efficiency (Burst Mode: 130µA IQ) or output stability (Forced Continuous: zero-current-skip ripple) based on system load profile. |
| DDR memory termination support | Enables ±1.5A sink/source capability when SRLIM = SVIN - meets JEDEC DDR3/DDR4 VTT rail requirements with single IC. |
| 100% duty cycle low-dropout operation | Maintains regulation as input voltage approaches output - extends usable battery voltage range and runtime in Li-ion-powered devices. |
Applications
| Portable Computer Systems | DDR Memory Termination |
|---|---|
|
Use Scenario: Powering core SoC rails (e.g., CPU I/O, GPU memory interface) in ultrabooks and tablets with single-cell Li-ion battery input. IC Role / Device Role / Timing Role: Dual-channel step-down regulator delivering 1.8V/3A and 2.5V/3A simultaneously with interleaved phase to minimize input ripple. Use Value: 94% peak efficiency and 130µA no-load IQ extend battery life; 100% duty cycle sustains operation down to 2.25V input. |
Use Scenario: Providing bidirectional VTT termination for DDR3/DDR4 memory subsystems in laptops and embedded controllers. IC Role / Device Role / Timing Role: Regulator operating in Forced Continuous Mode with SRLIM = SVIN to deliver ±1.5A sink/source current at 0.9V/1.2V. Use Value: Eliminates need for discrete op-amp + MOSFET VTT solution; reduces footprint and component count while meeting JEDEC transient specs. |
| Point-of-Load Supplies | Handheld Devices |
|
Use Scenario: Local regulation for FPGA I/O banks, ASIC auxiliary supplies, or sensor signal chains in space-constrained industrial modules. IC Role / Device Role / Timing Role: High-density dual buck converter in 4mm × 6.5mm TSSOP package, supporting 4MHz switching for sub-1µH inductors. Use Value: Small solution size (< 150 mm² total) and programmable soft-start (TRACK/SS pins) prevent inrush current during hot-plug events. |
Use Scenario: Power management in ruggedized handheld test equipment and medical monitors requiring wide temperature operation. IC Role / Device Role / Timing Role: Dual 3A regulator rated for –40°C to 125°C junction temperature, with undervoltage lockout (1.7V) and thermal shutdown. Use Value: Guaranteed performance across full industrial temp range; exposed PGND pad ensures reliable thermal dissipation in sealed enclosures. |
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 |
|---|---|---|---|
| TPS54383PWPR | 3A dual buck, 4.5–28V input, fixed 3.3V/1.2V outputs, no phase shift, 500kHz–2.2MHz sync-capable | Higher input range but lacks 140°/180° phase shift and DDR sink capability | Choose for wide-input industrial systems where phase optimization is unnecessary and fixed outputs suffice. |
| ISL85415IRZ-T7A | Single 5A buck, 3–40V input, 1.2–12V adjustable output, 200kHz–2.2MHz sync, no dual-channel or phase control | Single-output only; no multi-rail or interleaving capability | Use when only one high-current rail is needed and higher input voltage tolerance is required over battery-operated use cases. |
Compared with TPS54383PWPR and ISL85415IRZ-T7A, the LTC3615IFE-1#PBF uniquely delivers 140°/180° phase shift, ±1.5A DDR sink capability, and 130µA Burst Mode IQ - making it optimal for compact, battery-sensitive dual-rail designs where input ripple and light-load efficiency are critical.
Availability
LTC3615IFE-1#PBF is available at Aetrix Electronics and suitable for portable computer systems, DDR memory termination, and point-of-load supplies requiring stable component supply, long-term industrial temperature support (–40°C to 125°C), and consistent parametric performance across production lots.
Supply support for LTC3615IFE-1#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 its high-performance power management portfolio, emphasizing precision, efficiency, and reliability in analog and mixed-signal ICs.
The LTC3615IFE-1#PBF belongs to Linear's monolithic synchronous buck regulator family, engineered specifically for high-density, low-voltage point-of-load conversion in battery-powered and DDR memory applications.
FAQ
What distinguishes LTC3615IFE-1#PBF from the standard LTC3615?
The LTC3615IFE-1#PBF is the -1 variant, meaning it supports only 140° or 180° phase shift between channels (selected via PHASE pin voltage), unlike the base LTC3615 which offers 0°/90°/180°. This variant is optimized for applications prioritizing input ripple reduction over flexible phase alignment, and retains identical electrical specs including 3A per channel, 2.25V–5.5V input, and ±1% VFB accuracy.
Does LTC3615IFE-1#PBF support DDR memory termination?
Yes, the LTC3615IFE-1#PBF supports DDR termination when the SRLIM pin is tied to SVIN, enabling ±1.5A sink/source capability in Forced Continuous Mode. This meets JEDEC-compliant VTT rail requirements for DDR3 and DDR4 memory interfaces, eliminating the need for external op-amps or discrete FETs in the termination path.
What is the thermal performance of LTC3615IFE-1#PBF in the TSSOP package?
The LTC3615IFE-1#PBF in the 24-pin eTSSOP (FE) package has a junction-to-ambient thermal resistance (θJA) of 33°C/W under standard JEDEC PCB conditions. The exposed PGND pad (Pin 25) must be soldered to a thermal pad on the PCB to achieve this rating - insufficient thermal land area or missing vias will degrade thermal performance and limit sustained 3A output capability.
Can LTC3615IFE-1#PBF operate with a 2.25V input supply?
Yes, the LTC3615IFE-1#PBF operates down to 2.25V input and supports 100% duty cycle, allowing regulation even when input voltage equals or slightly exceeds the output voltage. At 2.25V input, it can sustain 1.8V/3A output with verified efficiency >85% (per typical curves), making it suitable for deep-discharge Li-ion battery operation.
How is phase shift configured on LTC3615IFE-1#PBF?
Phase shift on the LTC3615IFE-1#PBF is set solely by the PHASE pin voltage relative to SVIN: 140° is selected when PHASE < 0.65×SVIN, and 180° when PHASE > 0.85×SVIN. No resistor divider or external logic is required - a simple resistor-to-SGND or direct SVIN tie-off suffices, and the setting applies identically to both channels.
LTC3615IFE-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width) 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-TSSOP
LTC3615IFE-1#PBF FAQ
1.How can I place an order for LTC3615IFE-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IFE-1#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 LTC3615IFE-1#PBF reliable?
The price and inventory of LTC3615IFE-1#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615IFE-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615IFE-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IFE-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IFE-1#PBF?
LTC3615IFE-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IFE-1#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 LTC3615IFE-1#PBF?
For technical support, including LTC3615IFE-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IFE-1#PBF requirements.
6.How does Aetrix verify that LTC3615IFE-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IFE-1#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 LTC3615IFE-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615IFE-1#PBF?
All LTC3615IFE-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IFE-1#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 LTC3615IFE-1#PBF part is unused and in its original packaging.
Return procedure for LTC3615IFE-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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