LTC3876IUHF#PBF Analog Devices Integrated Circuit (Quad Flat No-Lead) In Stock
LTC3876IUHF#PBF is a dual-output DDR voltage regulator controller from Analog Devices using current-mode controlled on-time architecture. Key specs: 4.5 V to 38 V input range, adjustable outputs from 1 V to 2.5 V, and dual-channel operation in a 38-pin QFN (5x7) package. Available in stock with worldwide shipping.
- Manufacturer
- Analog Devices
- Package
- Quad Flat No-Lead
- Pin Count
- 38
- Lifecycle
- ACTIVE
- Datasheet
- LTC3876IUHF#PBF Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $4.6100(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual-channel DDR voltage regulator controller managing VDDQ and VTT rails from a single IC
- Current-mode controlled on-time architecture providing fast load-transient response for DDR memory
- Wide 4.5 V to 38 V input range supporting 12 V and 24 V system rails
- Adjustable output voltage from 1 V to 2.5 V covering DDR3, DDR4, and LPDDR supply requirements
- 38-pin QFN (5x7 mm) package enabling compact, high-density memory power supply layouts
- Differential remote sensing for accurate output voltage regulation at the memory die
Applications
LTC3876IUHF#PBF is designed for server, workstation, and high-performance computing platforms where precise dual-output DDR memory power regulation is required across wide input voltage swings. It is also used in network equipment and storage controllers that need a compact, high-accuracy VDDQ and VTT regulator capable of fast transient recovery to maintain DDR signal integrity under dynamic workloads.
Specifications
| Pbfree Code | No |
| Manufacturer Package Code | 05-08-1701 |
| YTEOL | 10 |
| Additional Feature | OPERATES IN ADJUSTABLE MODE FROM 1 TO 2.5V |
| Analog IC - Other Type | DUAL SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | CONTROLLED ON TIME |
| Input Voltage-Max | 38V |
| Input Voltage-Min | 4.5V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PQCC-N38 |
| JESD-609 Code | e3 |
| Number of Functions | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE |
| Peak Reflow Temperature (Cel) | 260 |
| Surface Mount | YES |
| Switcher Configuration | PHASE-SHIFT |
| Switching Frequency-Max | 550kHz |
| Technology | CMOS |
| Temperature Grade | AUTOMOTIVE |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.5mm |
| Terminal Position | QUAD |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Quad Flat No-Lead |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does LTC3876IUHF#PBF's controlled on-time architecture improve transient response for DDR memory loads?
Controlled on-time modulation in LTC3876IUHF#PBF allows the high-side MOSFET to turn on immediately when output voltage droops below the reference, without waiting for a clock edge. This enables peak current delivery within one switching period, keeping output voltage deviation under 50 mV for 5 A to 10 A load steps typical of DDR3/DDR4 rank switching, which is critical for meeting memory timing margins.
What DDR generations can LTC3876IUHF#PBF support with its 1 V to 2.5 V adjustable output range?
The 1 V to 2.5 V adjustable output range covers DDR3 at 1.5 V or 1.35 V (low-voltage), DDR4 at 1.2 V, and LPDDR4 at 1.1 V, making LTC3876IUHF#PBF a versatile controller for multiple memory generations. The dual output also simultaneously regulates VDDQ (main memory supply) and VTT (termination at half VDDQ), both derived from a single 38-pin controller IC.
Does LTC3876IUHF#PBF support remote voltage sensing, and why is that important for server memory rails?
LTC3876IUHF#PBF supports differential remote sensing, connecting the feedback loop directly at the DDR DIMM connector rather than at the regulator output. This compensates for PCB trace resistance drops that can reach 10 mV to 30 mV on a long VDDQ plane, ensuring the memory device receives the specified supply voltage within JEDEC tolerance even under heavy load in multi-DIMM server configurations.
For a 12 V rack server board, how does the 38-pin QFN package of LTC3876IUHF#PBF affect layout density near the DIMM slots?
The 38-pin QFN package measures 5 mm x 7 mm, providing a compact footprint that fits between DIMM slots on dense server motherboards. Its exposed pad improves thermal dissipation compared to an equivalent SOIC package, and the short 5 mm x 7 mm body allows the external sense resistors and gate-drive capacitors to be placed within 5 mm of the IC, minimizing parasitic inductance in the 4.5 V to 38 V input path.
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About Analog Devices
Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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