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Analog Devices Inc. LTC3615IUF#PBF
- Part No.:
- LTC3615IUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615IUF#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:275
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Product details
Overview
LTC3615IUF#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, synchronous step-down DC/DC converter IC with integrated 3A power MOSFETs per channel, operating at up to 4MHz switching frequency, supporting 2.25V–5.5V input and 0.6V–VIN output ranges, and delivering ±1% output voltage accuracy - designed for high-efficiency point-of-load regulation in battery-powered portable systems.
For engineers reviewing the LTC3615IUF#PBF datasheet, LTC3615IUF#PBF pinout, LTC3615IUF#PBF application, or LTC3615IUF#PBF equivalent, key selection considerations include phase-shift configuration (0°/90°/180°), selectable operating modes (Burst/Pulse-Skipping/Forced Continuous), internal/external compensation, DDR memory termination capability, and QFN-24 thermal performance under 3A/channel load.
Technical Context
The LTC3615IUF#PBF implements current-mode, constant-frequency control across two independent 3A buck regulators sharing synchronized clock and reference circuits to ensure tight channel-to-channel matching. Its architecture supports programmable slew rate limiting via SRLIM, external synchronization up to 4MHz, and active voltage positioning (AVP) when ITH is tied to SVIN.
It features dual independent enable (RUN1/RUN2), tracking/soft-start (TRACK/SS1/SS2), and phase-select (PHASE) pins enabling coordinated startup, dynamic voltage scaling, and input/output ripple minimization through configurable inter-channel phase offset - critical for single-supply 6A or dual-rail 3A+3A distributed power architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - enables direct operation from single Li-Ion or Li-Polymer cells without pre-regulation. |
| Output Current per Channel | 3A continuous - supports high-current digital loads such as processors, FPGAs, and DDR memory subsystems. |
| Switching Frequency | Up to 4MHz - allows use of compact 0.47µH inductors and reduces EMI filtering requirements. |
| Feedback Reference Voltage | 0.6V ±1% - provides precise low-voltage regulation down to 0.6V with minimal resistor divider error. |
| Quiescent Current (Burst Mode) | 130µA - extends battery life in standby or light-load states while maintaining regulated outputs. |
| Shutdown Current | ≤1µA - ensures near-zero power draw during system sleep or off-state. |
| Phase Shift Options | 0°, 90°, or 180° - selectable via PHASE pin voltage to minimize input capacitor RMS current and output voltage ripple. |
Pinout & Package
The LTC3615IUF#PBF is housed in a thermally enhanced 24-pin (4mm × 4mm) plastic QFN package with exposed PGND pad (Pin 25) requiring PCB soldering for optimal thermal and electrical performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / 2 Switching Node | Connects to external inductor; drives internal P/N-MOSFET pair; requires low-inductance layout for EMI control. |
| FB1 / FB2 | Voltage Feedback Input | Monitors output via resistive divider; sets regulated output voltage using 0.6V internal reference. |
| ITH1 / ITH2 | Error Amplifier Compensation | Accepts external RC network for loop stability; tie to SVIN to enable AVP mode with internal compensation. |
| RUN1 / RUN2 | Channel Enable Input | Active-high logic; controls individual channel startup/shutdown; both low disables entire device (<1µA IQ). |
| TRACK/SS1 / TRACK/SS2 | Soft-Start / Tracking Input | Programmable startup timing or voltage tracking; supports sequencing with other rails or external references. |
| PHASE | Inter-Channel Phase Select | 0°/90°/180° shift between SW1/SW2 - reduces input ripple and improves thermal distribution in dual-output designs. |
| SRLIM | Slew Rate Limit Control | Adjusts switch node edge rates to reduce EMI; tie to SVIN to enable DDR sink-current mode (±1.5A). |
| RT/SYNC | Oscillator Frequency Control | Resistor-set (400kHz–4MHz), external clock sync (up to 4MHz), or internal 2.25MHz default when tied to SVIN. |
| MODE | Operating Mode Selection | Selects Burst Mode (SGND), Pulse-Skipping (SVIN), Forced Continuous (1.1V–0.58×SVIN), or external-clamp Burst. |
| PGOOD1 / PGOOD2 | Power Good Output | Open-drain status flag indicating ±7.5% output regulation window; pulled low on fault or disable. |
| PVIN1 / PVIN2 | Channel Power Input | Independent high-side MOSFET source connections; may be tied to same or lower voltage than SVIN. |
| SVIN | Signal Supply Input | Powers internal bias circuitry; monitored by UVLO (2.25V threshold); must be ≥2.25V for operation. |
| SGND | Signal Ground Reference | Reference for all small-signal pins (FB, ITH, TRACK/SS); connect to PGND at single point to avoid noise coupling. |
| PGND (Pin 25) | Power Ground | Common source node for bottom N-MOSFETs; exposed pad must be soldered to large PCB copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Eliminates external catch diodes, reduces board area, and achieves up to 94% peak efficiency at 3A load. |
| Programmable 0°/90°/180° phase shift | Reduces input capacitor RMS current by up to 70% in dual 3A configuration, lowering heat and component stress. |
| Burst Mode operation with 130µA IQ | Maintains regulation during light loads while minimizing switching losses - critical for battery runtime extension. |
| 100% duty cycle low-dropout capability | Enables operation with VIN as low as VOUT + ILOAD × RDS(ON), extending usable battery voltage range. |
| DDR memory termination support | Configurable sinking capability (±1.5A) via SRLIM = SVIN enables compliant DDR2/DDR3 VTT rail generation. |
| Internal or external compensation | Flexible loop tuning: internal AVP mode (ITH = SVIN) for simplified layout or external RC for custom transient response. |
Applications
| Point-of-Load Regulation | Portable Computing Power |
|---|---|
Use Scenario: Regulating core voltage for ARM-based SoCs or microcontrollers in handheld devices with strict size and thermal constraints. IC Role / Device Role / Timing Role: Dual-channel buck controller providing independent 1.2V/1.8V rails with synchronized phase to suppress input ripple. Use Value: Enables compact 2-layer PCB design with 0.47µH inductors and eliminates discrete diodes, reducing BOM count by 4 components per channel. |
Use Scenario: Powering CPU, GPU, and memory subsystems in ultrabooks and tablets requiring fast transient response and low quiescent current. IC Role / Device Role / Timing Role: Primary DC/DC regulator delivering 3A per rail with programmable soft-start and tracking for safe multi-rail sequencing. Use Value: Achieves <130µA no-load IQ and ±1% output accuracy across –40°C to 125°C, ensuring stable operation during battery discharge cycles. |
| DDR Memory Termination | Distributed Power Architecture |
Use Scenario: Generating matched ±1.5A VTT supply for DDR3/DDR4 memory interfaces with bidirectional current capability. IC Role / Device Role / Timing Role: Configured in DDR mode (SRLIM = SVIN) to provide sink/source current with fast transient recovery. Use Value: Meets JEDEC DDR termination specs without external op-amps or current mirrors, reducing solution footprint by 35%. |
Use Scenario: Providing isolated 3A rails to multiple subsystems (e.g., sensor hub, radio, display) in industrial IoT gateways. IC Role / Device Role / Timing Role: Dual-output converter with independent RUN/PGOOD signals enabling modular power domain control and fault isolation. Use Value: Supports hot-swap sequencing and independent enable/disable per rail, improving system-level reliability and diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS652860RHBR | Single 6A output (not dual 3A); fixed 2.2MHz frequency; no phase-shift option; 2.7V–5.5V input. | Best suited for space-constrained single-rail applications where inter-channel independence is unnecessary. | Choose TPS652860RHBR only if dual independent control, phase shifting, or sub-2.7V operation is not required. |
| MPQ4420AGU-AEC1-P | Automotive-grade dual 2A buck; 3.3V–36V input; no Burst Mode; higher IQ (250µA); AEC-Q100 qualified. | Targeted at automotive infotainment and ADAS modules requiring extended temperature and qualification compliance. | Choose MPQ4420AGU-AEC1-P only for automotive environments demanding AEC-Q100 Grade 1 and >36V input tolerance. |
Compared with TPS652860RHBR and MPQ4420AGU-AEC1-P, the LTC3615IUF#PBF uniquely delivers dual independent 3A channels with 0°/90°/180° phase shift, 2.25V minimum input, 130µA Burst Mode IQ, and DDR sink capability - making it optimal for portable, battery-sensitive, and multi-rail embedded systems.
Availability
LTC3615IUF#PBF is available at Aetrix Electronics and suitable for point-of-load supplies, portable computer systems, and DDR memory termination requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for LTC3615IUF#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 legacy of high-performance analog and power management ICs with rigorous characterization and application-focused design.
The LTC3615IUF#PBF belongs to Linear's monolithic synchronous buck regulator product line, engineered specifically for high-efficiency, low-noise, multi-rail power delivery in portable, battery-operated, and space-constrained embedded systems.
FAQ
What is the maximum switching frequency supported by the LTC3615IUF#PBF?
The LTC3615IUF#PBF supports an externally programmable switching frequency up to 4MHz via the RT/SYNC pin - either through a resistor-to-ground network, an external clock signal, or by tying RT/SYNC to SVIN for the internal 2.25MHz default. This high-frequency capability enables use of miniature 0.47µH inductors and reduces output capacitance requirements in compact designs.
Does the LTC3615IUF#PBF support DDR memory termination with sink current capability?
Yes, the LTC3615IUF#PBF supports DDR memory termination when the SRLIM pin is tied to SVIN, enabling ±1.5A bidirectional current delivery per channel. This configuration activates DDR mode, allowing the device to both source and sink current to maintain precise VTT regulation - meeting JEDEC-compliant DDR2/DDR3 termination requirements without external circuitry.
How does phase shift selection affect input ripple in the LTC3615IUF#PBF?
The LTC3615IUF#PBF allows 0°, 90°, or 180° phase shift between SW1 and SW2 via the PHASE pin voltage. At 180°, input capacitor RMS current is reduced by up to 70% compared to 0° operation - directly lowering thermal stress on input capacitors and permitting smaller, lower-ESR ceramic types in dual 3A configurations.
What are the key differences between Burst Mode and Forced Continuous Mode in the LTC3615IUF#PBF?
In Burst Mode (MODE = SGND), the LTC3615IUF#PBF pulses intermittently at light loads to achieve 130µA quiescent current, trading higher output ripple for superior light-load efficiency. In Forced Continuous Mode (MODE = 1.1V–0.58×SVIN), it sustains constant switching regardless of load - delivering lowest output ripple and enabling bidirectional current flow (e.g., DDR sink), but at higher IQ (~1.9mA).
Can the LTC3615IUF#PBF operate from a single-cell Li-Ion battery throughout its full discharge range?
Yes, the LTC3615IUF#PBF operates from 2.25V to 5.5V input and supports 100% duty cycle operation, allowing regulation down to VOUT + ILOAD × RDS(ON). With typical RDS(ON) of 75mΩ (top) and 55mΩ (bottom), it maintains regulation across the full Li-Ion discharge curve (4.2V → 2.7V), extending usable battery life in portable applications.
LTC3615IUF#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)
LTC3615IUF#PBF FAQ
1.How can I place an order for LTC3615IUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615IUF#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 LTC3615IUF#PBF reliable?
The price and inventory of LTC3615IUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3615IUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615IUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615IUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615IUF#PBF?
LTC3615IUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615IUF#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 LTC3615IUF#PBF?
For technical support, including LTC3615IUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615IUF#PBF requirements.
6.How does Aetrix verify that LTC3615IUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615IUF#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 LTC3615IUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615IUF#PBF?
All LTC3615IUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615IUF#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 LTC3615IUF#PBF part is unused and in its original packaging.
Return procedure for LTC3615IUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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