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Analog Devices Inc. LTC3615HUF-1#PBF
- Part No.:
- LTC3615HUF-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3615HUF-1#PBF.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
LTC3615HUF-1#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 140°/180° inter-channel phase shift. It features ±1% output voltage accuracy, 0.6V minimum output, and 100% duty cycle low-dropout operation for Li-ion battery systems. Used in point-of-load regulation for DDR memory and portable computing power rails.
For engineers reviewing the LTC3615HUF-1#PBF datasheet, LTC3615HUF-1#PBF pinout, LTC3615HUF-1#PBF application, or LTC3615HUF-1#PBF equivalent, key selection criteria include dual 3A output capability, selectable 140°/180° phase shift for ripple reduction, programmable slew rate limiting, Burst Mode® operation with 130µA quiescent current, and support for active voltage positioning (AVP) in DDR termination.
Technical Context
The LTC3615HUF-1#PBF implements a current-mode, constant-frequency architecture with independent control loops per channel, sharing clock and reference circuits to ensure tight channel-to-channel matching. Its dual-phase operation supports 140° or 180° phase shift-selected via the PHASE pin-to minimize input current ripple in dual-output configurations or enable single 6A output with reduced output voltage ripple.
It integrates synchronous P-channel and N-channel MOSFETs with RDS(ON) of 75mΩ (top) and 55mΩ (bottom) at 3.3V PVIN, enabling high efficiency up to 94% without external catch diodes. The ITH pin provides error amplifier compensation and enables AVP mode when tied to SVIN, while MODE pin selection determines operating mode (Burst, Pulse-Skipping, or Forced Continuous), directly affecting light-load efficiency and output ripple behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.25V to 5.5V - supports single-cell Li-ion (2.7–4.2V) with headroom for full discharge and charging transients. |
| Output Current per Channel | 3A continuous - delivers sufficient current for core logic, DDR termination, or FPGA I/O rails without external current boosting. |
| Switching Frequency | Up to 4MHz - enables use of sub-1µH inductors (e.g., 0.47µH) and compact ceramic output capacitors (e.g., 47µF). |
| Phase Shift Options | 140° or 180° - reduces input RMS current by up to 30% in dual 3A configuration; eliminates need for external interleaving circuitry. |
| Quiescent Current | 130µA in Burst Mode® at no load - extends battery runtime in always-on subsystems like real-time clocks or sensor interfaces. |
| Output Voltage Accuracy | ±1% over temperature - ensures stable DDR VTT or processor core voltage within JEDEC-compliant tolerance bands. |
| Shutdown Current | ≤1µA - meets ultra-low-power system-level sleep requirements for handheld and IoT devices. |
Pinout & Package
Package: 24-pin (4mm × 4mm) plastic QFN with exposed PGND pad (Pin 25), rated for –40°C to +150°C junction temperature. Thermal resistance θJA = 37°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 / SW2 | Channel 1 / 2 switching node | Connects to inductor; carries high di/dt pulsed current - requires short, low-inductance PCB routing and local decoupling. |
| VFB1 / VFB2 | Feedback input for channel 1 / 2 | Monitors output voltage via resistive divider; internal 0.6V reference sets regulation point - enables precise 0.6V–5.5V output programming. |
| ITH1 / ITH2 | Error amplifier compensation node | Controls peak inductor current; tie to SVIN to enable internal compensation and Active Voltage Positioning (AVP) for DDR applications. |
| PHASE | Inter-channel phase shift selector | 0V → 140°, SVIN → 180° - configures ripple cancellation without external timing components or PLL circuitry. |
| SRLIM | Slew rate limit / DDR mode enable | Tied to SVIN → enables DDR sink capability (±1.5A) and adjusts switch edge rates to reduce EMI emissions. |
| MODE | Operating mode control | SGND → Burst Mode®, SVIN → Pulse-Skipping, 1.1V–0.58×SVIN → Forced Continuous - selects trade-off between light-load efficiency and output ripple. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicator | Asserts low when output deviates >±7.5% from setpoint - used for sequencing, fault reporting, or enabling downstream circuitry. |
| RT/SYNC | Frequency setting / synchronization input | Resistor-to-GND sets fSW (400kHz–4MHz); external clock up to 4MHz synchronizes multiple converters to suppress beat frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 3A synchronous buck channels | Eliminates need for two discrete converters or external MOSFETs - reduces BOM count, board area, and thermal complexity in multi-rail systems. |
| 140°/180° selectable phase shift | Reduces input capacitor RMS current by ~25% vs. 0° phase, allowing smaller input bulk capacitance and lower EMI filter cost. |
| Burst Mode® with 130µA IQ | Maintains regulation during standby while minimizing battery drain - critical for long-idle portable medical or industrial sensors. |
| Programmable slew rate on SW pins | Adjusts dV/dt via SRLIM resistor to meet Class B EMC limits without sacrificing efficiency or requiring ferrite beads. |
| DDR memory termination mode | Enables ±1.5A sourcing/sinking with AVP - satisfies JEDEC DDR3/DDR4 VTT rail requirements including dynamic load transient response. |
| 100% duty cycle low-dropout operation | Extends usable battery life by maintaining regulation down to VOUT + (ILOAD × RDS(ON)) - e.g., 1.8V output sustained at 3A with 2.25V input. |
Applications
| DDR Memory Termination | Portable Computer Core Power |
|---|---|
Use Scenario: Providing tightly regulated, bidirectional VTT supply for DDR3/DDR4 memory modules in laptops and tablets. IC Role / Device Role / Timing Role: Dual-channel buck regulator operating in Forced Continuous Mode with AVP enabled via ITH1/ITH2 tied to SVIN, delivering ±1.5A sink/source capability. Use Value: Meets JEDEC-specified VTT transient response (±5% under 1.5A step) and eliminates need for discrete op-amp-based tracking solutions. | Use Scenario: Generating 1.2V CPU core and 1.8V I/O rails from a shared 3.3V intermediate bus in ultrabooks and 2-in-1 devices. IC Role / Device Role / Timing Role: Dual-output converter with 180° phase shift and 4MHz switching, using small 0.47µH inductors and 47µF X5R ceramics per rail. Use Value: Reduces total solution size by 40% vs. discrete regulators while achieving >92% efficiency at 2A per rail. |
| Point-of-Load for FPGA I/O Banks | Industrial Handheld Battery Management |
Use Scenario: Delivering multiple low-noise, fast-transient 1.2V/1.5V/1.8V supplies to FPGA I/O banks in test equipment and edge AI accelerators. IC Role / Device Role / Timing Role: Configured with independent TRACK/SS1/SS2 pins for power-up sequencing and external soft-start capacitors for controlled ramp rates. Use Value: Prevents I/O bank latch-up during power-up and supports hot-swap compliance with programmable slew-controlled switching edges. | Use Scenario: Regulating 1.8V and 3.3V rails from a single Li-ion cell (2.8–4.2V) in ruggedized handheld meters and barcode scanners. IC Role / Device Role / Timing Role: Operates in Burst Mode® at light loads (<10mA) and transitions seamlessly to Forced Continuous Mode under active measurement bursts. Use Value: Achieves >120 hours of standby time on 1000mAh battery while maintaining <100µVpp output ripple during active sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54386PWPR | Single 3A output (not dual); fixed 500kHz–2.2MHz frequency; no phase shift or DDR mode. | Requires two ICs for dual 3A; lacks AVP and bidirectional sinking for DDR VTT. | Choose only if system needs lower cost per amp and can accept separate regulators with higher board area. |
| ISL85415IRZ-T7A | Dual 2.5A outputs; 2.2MHz max frequency; no programmable phase shift; 1.2V min output. | Lower per-channel current rating; cannot support 0.6V DDR VREF or ±1.5A DDR sink without external circuitry. | Select when 2.5A/channel suffices and thermal budget allows slightly lower efficiency at 3A load points. |
Compared with TPS54386PWPR and ISL85415IRZ-T7A, the LTC3615HUF-1#PBF uniquely delivers dual 3A channels with 140°/180° phase shift, DDR-specific sinking capability, and 130µA Burst Mode® IQ - making it the only option that satisfies simultaneous high-current density, low-EMI, and JEDEC-compliant DDR termination requirements in space-constrained Li-ion systems.
Availability
LTC3615HUF-1#PBF is available at Aetrix Electronics and suitable for DDR memory termination, portable computer core power, and industrial handheld battery management requiring stable component supply across extended temperature ranges.
Supply support for LTC3615HUF-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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets.
The LTC3615 product line was designed specifically for high-efficiency, space-constrained point-of-load applications in battery-powered and DDR-memory-intensive systems - emphasizing low IQ, fast transient response, and integrated phase-shifted dual-channel operation.
FAQ
What is the maximum ambient temperature at which LTC3615HUF-1#PBF can operate continuously?
The LTC3615HUF-1#PBF is specified for operation up to +150°C junction temperature. With θJA = 37°C/W and typical power dissipation of ~0.8W at 3A per channel, the maximum ambient temperature is approximately +115°C under standard PCB layout conditions. Derating is required above 125°C junction to maintain reliability - consult the datasheet's thermal derating curves for specific copper pour configurations.
Does LTC3615HUF-1#PBF support DDR4 VTT termination with active voltage positioning?
Yes. The LTC3615HUF-1#PBF supports DDR4 VTT termination via its DDR mode: tie SRLIM to SVIN and configure ITH1/ITH2 to SVIN to enable Active Voltage Positioning (AVP). This provides ±1.5A sourcing/sinking capability with dynamic tracking of VDDQ/2, meeting JEDEC JESD79-4A VTT transient and accuracy requirements for DDR4 systems.
How does the PHASE pin configure 140° vs 180° phase shift in LTC3615HUF-1#PBF?
In the LTC3615HUF-1#PBF (the -1 variant), the PHASE pin selects between 140° and 180° inter-channel phase shift: tying PHASE to SGND selects 140°, while tying it to SVIN selects 180°. Unlike the base LTC3615, it does not support 0° or 90° - this fixed dual-phase option optimizes input ripple cancellation for high-current dual-rail applications without requiring precision voltage dividers.
Can LTC3615HUF-1#PBF operate with input voltage below 2.25V?
No. The absolute minimum input voltage for normal operation is 2.25V as specified in the Electrical Characteristics table. Below this, undervoltage lockout (UVLO) activates at 1.7V (ramping down) and prevents startup until SVIN exceeds 2.25V (ramping up). Operation below 2.25V risks regulation loss, increased dropout, and potential PGOOD assertion failure.
What is the purpose of the SRLIM pin in LTC3615HUF-1#PBF beyond slew rate control?
Beyond controlling switch-node slew rate, the SRLIM pin enables DDR mode when tied to SVIN: this activates bidirectional current capability (±1.5A), adjusts the PGOOD window to track the TRACK/SS voltage, and configures the error amplifier for active voltage positioning. In DDR mode, the device functions as a true VTT regulator compliant with JEDEC DDR3/DDR4 specifications - a function not available when SRLIM is grounded or left floating.
LTC3615HUF-1#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)
LTC3615HUF-1#PBF FAQ
1.How can I place an order for LTC3615HUF-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3615HUF-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 LTC3615HUF-1#PBF reliable?
The price and inventory of LTC3615HUF-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 LTC3615HUF-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3615HUF-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3615HUF-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3615HUF-1#PBF?
LTC3615HUF-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3615HUF-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 LTC3615HUF-1#PBF?
For technical support, including LTC3615HUF-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3615HUF-1#PBF requirements.
6.How does Aetrix verify that LTC3615HUF-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3615HUF-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 LTC3615HUF-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3615HUF-1#PBF?
All LTC3615HUF-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3615HUF-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 LTC3615HUF-1#PBF part is unused and in its original packaging.
Return procedure for LTC3615HUF-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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