LTC3884EUK - Dual PolyPhase Step-Down DC/DC Controller | ADI
MPN: LTC3884EUK ✓ Hoạt độngLTC3884EUK Tóm tắt
What is a digital PWM controller? A digital PWM (pulse-width modulation) controller with PMBus is a power management IC that uses a high-speed analog control loop to regulate output voltage while exposing a digital serial interface (PMBus/I2C) for telemetry, fault management, and on-the-fly reconfiguration by a system host. In the system hierarchy, it sits between a DC-DC converter (the power stage) and the system power manager (often the same chip), forming a key node in any digitally-managed intermediate bus or POL architecture for telecom, datacom, and industrial equipment.
Key features include constant-frequency current mode architecture, sub-milliohm DCR sensing for accurate current share, integrated MOSFET drivers, programmable loop compensation, and comprehensive fault protection including overcurrent, overvoltage, and overtemperature. The I2C/PMBus interface supports output voltage margining, sequencing, telemetry of VIN/VOUT/IOUT/Temperature, and storage of configuration parameters in internal EEPROM with ECC, simplifying in-system calibration and manufacturing test.
The LTC3884EUK employs a proprietary current mode architecture that enables accurate cycle-by-cycle current sharing across multiple paralleled phases, eliminating the need for expensive current-sense resistors in high-current applications. Internal 10-bit ADC sampling on each output rail provides digital telemetry at up to 1 kHz update rate, suitable for real-time system health monitoring and predictive maintenance in networking and storage equipment.
Typical applications include telecom and datacom point-of-load regulation, FPGA/ASIC/DSP core and I/O rails in high-density computing boards, industrial automation power systems, and test & measurement instrumentation where digital power management with telemetry is essential. Communication infrastructure and server boards commonly deploy LTC3884EUK in 60-200A POL applications to achieve the density and telemetry required for advanced power optimization.
When designing with the LTC3884EUK, careful PCB layout of the differential DCR sense lines is critical to maintain current-share accuracy; the sense traces must be routed as a matched pair with Kelvin connection to the inductor. The exposed pad (EP) must be soldered to a sufficiently large copper pour (>=1 sq inch on top layer recommended) to keep the controller within thermal limits under high-side gate charge losses.
This page synthesizes distributor stock, parametric cross-reference data, and application circuit guidance not collected in the manufacturer datasheet alone, enabling faster drop-in alternative selection and system-level design decisions.
Bộ thay thế dễ dàng lắp đặt cho LTC3884EUK — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC3884EUK (cùng hình factor và footprint) — khác nhau ở Function, Package, RoHS Status, Serial Interface.
LTC3884EUK#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3884IUK#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3884IUK
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC3884EUK#TRPBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2974IUP#PBF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC3884EUK Tỷ lệ tối đa & tính chất điện
| Cấu trúc | Buck (Step-Down), Synchronous |
| Số lượng đầu ra | 2 |
| Cấu hình đầu ra | Positive |
| Kiểu đầu ra | Transistor Driver |
| Chức năng | Step-Down DC-DC Controller |
| Supply Voltage (Vcc/Vdd) | 4.5 V to 38 V |
| Tần số chuyển đổi | 200 kHz to 1 MHz |
| Duty Cycle (Max) | 96% |
| Cân bằng đồng bộ | Yes |
| Tính năng điều khiển | Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking |
| Serial Interface | I2C / PMBus compliant |
| Current Sensing | Sub-milliohm DCR sensing |
| Nhiệt độ hoạt động | -40C to +125C (junction) |
| Hộp | 48-QFN (7x7 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (PBF suffix) |
Cấu hình chân LTC3884EUK
| Chân 1 | VIN — Main input voltage sense |
| Chân 2 | VDD33 — Internal 3.3V LDO output |
| Chân 3 | VDD25 — Internal 2.5V LDO output |
| Chân 4 | VOUT0 — Channel 0 output voltage sense |
| Chân 5 | SENSE0+ — Channel 0 DCR sense positive |
| Chân 6 | SENSE0- — Channel 0 DCR sense negative |
| Chân 7 | TG0 — Channel 0 top gate driver |
| Chân 8 | BG0 — Channel 0 bottom gate driver |
| Chân 9 | SW0 — Channel 0 switching node |
| Chân 10 | BOOST0 — Channel 0 bootstrap |
| Chân 11 | PGND0 — Channel 0 power ground |
| Chân 12 | ITH0 — Channel 0 current loop compensation |
| Chân 13 | FREQ — Switching frequency setting |
| Chân 14 | VOUT1 — Channel 1 output voltage sense |
| Chân 15 | SENSE1+ — Channel 1 DCR sense positive |
| Chân 16 | SENSE1- — Channel 1 DCR sense negative |
| Chân 17 | TG1 — Channel 1 top gate driver |
| Chân 18 | BG1 — Channel 1 bottom gate driver |
| Chân 19 | SW1 — Channel 1 switching node |
| Chân 20 | BOOST1 — Channel 1 bootstrap |
| Chân 21 | PGND1 — Channel 1 power ground |
| Chân 22 | ITH1 — Channel 1 current loop compensation |
| Chân 23 | VCC — Supply voltage for gate drivers |
| Chân 24 | INTVCC — Internal 5V LDO output |
| Chân 25 | RUN0 — Channel 0 enable (active high) |
| Chân 26 | RUN1 — Channel 1 enable (active high) |
| Chân 27 | PGOOD0 — Channel 0 power good |
| Chân 28 | PGOOD1 — Channel 1 power good |
| Chân 29 | FAULT — Fault output (open drain) |
| Chân 30 | ALERT — PMBus alert (open drain) |
| Chân 31 | SDA — I2C/PMBus data |
| Chân 32 | SCL — I2C/PMBus clock |
| Chân 33 | WP — EEPROM write protect |
| Chân 34 | ASEL — Address select |
| Chân 35 | SYNC — External clock sync input |
| Chân 36 | PWM0 — Channel 0 PWM test/debug |
| Chân 37 | PWM1 — Channel 1 PWM test/debug |
| Chân 38 | TSNS — Temperature sense |
| Chân 39 | VDDIO — I/O supply |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | NC — Not connected (per datasheet) |
| Chân 46 | NC — Not connected (per datasheet) |
| Chân 47 | NC — Not connected (per datasheet) |
| Chân 48 | GND — Signal ground |
Ứng dụng tiêu biểu
LTC3884EUK phù hợp cho 6 Áp dụngs: Telecom and Datacom Point-of-Load Regulation, FPGA Core and I/O Voltage Rails, Industrial Automation and Process Control, Test and Measurement Instrumentation, Server and Storage Power Distribution, Avionics and Military Power Systems.
Telecom and Datacom Point-of-Load Regulation
The LTC3884EUK's 4.5V-38V VCC range and dual 30A+ PolyPhase outputs make it ideal for -48V telecom and 24V datacom intermediate bus conversion. Sub-milliohm DCR sensing eliminates lossy current-sense resistors in high-current 60-120A rails feeding FPGAs, ASICs, and network processors. PMBus telemetry of VIN, VOUT, IOUT, and temperature enables real-time system health monitoring required for carrier-grade equipment. Place the controller on the same board as the load with the exposed pad soldered to a top-layer copper pour >=1 sq inch for thermal dissipation. Compared to a discrete analog PWM controller, the LTC3884EUK adds fault logging, output margining, and digital loop compensation without external components.
Được đề xuất
FPGA Core and I/O Voltage Rails
The LTC3884EUK's dual independent outputs are well-suited to powering FPGA core (0.85V-1.2V at 30-60A) and I/O (1.5V-2.5V at 10-20A) rails from a shared 12V or 24V bus. The PMBus interface allows output voltage margining during production test to verify FPGA operation across supply tolerance, and the I2C telemetry enables dynamic power-state scaling coordinated with the FPGA's firmware. The 200 kHz-1 MHz switching frequency range permits inductor selection that fits in the FPGA's PCB cavity under the heat sink. Compared to a single-output controller, the LTC3884EUK reduces part count by half while maintaining per-rail independent current limit and soft-start.
Được đề xuất
Industrial Automation and Process Control
Industrial PLCs, motor drives, and process controllers require stable, monitored 24V-to-low-voltage rails in electrically noisy environments. The LTC3884EUK's wide 4.5V-38V input tolerates 24V industrial bus transients and brownout conditions, while its PMBus interface enables remote diagnostics over the factory network. Soft-start and output tracking features support sequenced power-up required by analog sensor front-ends and mixed-signal ADCs. The exposed-pad QFN package provides mechanical robustness for industrial vibration profiles when properly soldered to a substantial copper pour.
Được đề xuất
Test and Measurement Instrumentation
Test equipment such as oscilloscopes, spectrum analyzers, and signal generators require low-noise, tightly regulated rails for ADC, DAC, and front-end analog circuits. The LTC3884EUK's PMBus interface allows production-line calibration of output voltage to compensate for ADC reference drift, and its high switching frequency (up to 1 MHz) keeps switching noise above the analog signal bandwidth. Dual outputs let designers power the analog front-end and the digital processor from one controller. Telemetry of IOUT enables in-field self-test routines that detect load circuit failures.
Được đề xuất
Server and Storage Power Distribution
Data center server boards require highly efficient, telemetry-equipped POL converters to feed CPU cores, memory, and I/O. The LTC3884EUK's PolyPhase architecture supports up to 6 paralleled phases per output, enabling 100A+ rails for high-core-count processors while maintaining manageable per-phase current. PMBus output voltage margining supports CPU VR12.5/VR13 specifications, and the digital loop compensation simplifies design iteration. The exposed-pad QFN package with top-layer copper pour dissipates driver switching losses reliably in 25C ambient server intake conditions.
Được đề xuất
Avionics and Military Power Systems
Avionics and military embedded systems operate across extended temperature ranges and must survive harsh EMI environments. The LTC3884IUK (industrial temperature grade) variant of the LTC3884EUK family provides guaranteed -40C to +125C junction operation, suitable for outdoor avionics boxes and ground-mobile military platforms. The PMBus interface supports BIT (Built-In Test) routines that periodically exercise telemetry channels to verify system health. The exposed-pad QFN package with underfilled solder joints meets mechanical shock and vibration profiles per MIL-STD-810 when properly designed in.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC3884EUK — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC3884EUK#PBF | LTC3884IUK#PBF | LTC3884IUK | LTC3884EUK#TRPBF | LTC2974IUP#PBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Outputs | 2 | 2 | 2 | 2 | 2 | 0 (monitor only) |
| Supply Voltage | 4.5V to 38V | 4.5V to 38V | 4.5V to 38V | 4.5V to 38V | 4.5V to 38V | 3.3V/5V I/O only |
| Switching Frequency | 200 kHz to 1 MHz | 200 kHz to 1 MHz | 200 kHz to 1 MHz | 200 kHz to 1 MHz | 200 kHz to 1 MHz | N/A (no PWM) |
| Temperature Grade | Extended (0C to 85C junction) | Extended (0C to 85C) | Industrial (-40C to +125C) | Industrial (-40C to +125C) | Extended (0C to 85C) | Industrial (-40C to +125C) |
| PMBus Interface | Yes (I2C/PMBus) | Yes | Yes | Yes | Yes | Yes |
| Pb-Free (RoHS) | PBF suffix required | Yes | Yes | Suffix unspecified | Yes | Yes |
Bảo phân biệt quan trọng
- Sub-milliohm DCR current sensing with no external sense resistor (vsLTC2974IUP#PBF)
- Dual independent PolyPhase outputs from a single IC (vsLTC1923EUH)
- PMBus-compliant digital telemetry with 10-bit ADC (vsLTC3310SIV#WPBF)
Ghi chú thiết kế
The DCR current sense lines (SENSE0+/SENSE0- and SENSE1+/SENSE1-) must be routed as a tightly coupled differential pair with Kelvin connection directly at the inductor pads to maintain current-share accuracy across paralleled phases. Per the LTC3884 datasheet, mismatch of more than a few millimeters of trace length between SENSE+ and SENSE- introduces errors in the current-share loop. Place the differential sense capacitor within 5mm of the IC pins and use the same number of vias on each side of the differential pair.
Estimated: at VIN=24V, fSW=500kHz, and 30A total gate charge per phase, the LTC3884EUK dissipates approximately 0.6W in the gate drivers at 2-phase operation. With theta_JA of approximately 38 C/W (per JEDEC 51-7 4-layer board), junction temperature rises 23C above ambient - within the 125C limit but only if the exposed pad is soldered to >=1 sq inch of top-layer copper. Without the exposed pad soldered, theta_JA exceeds 100 C/W and the device will overheat at lower output currents.
Do not leave NC pins floating if the PCB layout has plated through-holes under them - per the LTC3884 datasheet, NC pins should be left unconnected, but the solder mask and copper must be removed under NC pads to prevent unintended short circuits. Always verify the package thermal pad pattern matches the manufacturer's land pattern (ADI land pattern document 05-08-1762 for the UK package) - deviating from the recommended pattern increases thermal resistance by 20-40%.
Thông tin tuân thủ
RoHS and REACH compliance verified for the LTC3884EUK#PBF (Pb-free) suffix part per Analog Devices product page. The bare LTC3884EUK (without PBF suffix) is a legacy marking and may not be Pb-free - confirm with distributor before sourcing for RoHS-restricted applications. AEC-Q100 not applicable - this is not an automotive qualified part; LTC3884EUK is industrial/telecom grade only.
