LTC3884EUK - Dual PolyPhase Step-Down DC/DC Controller | ADI
Артикул: LTC3884EUK ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $11.5 | $11,50 |
| 10 | $10.35 | $103,50 |
| 100 | $9.2 | $920,00 |
| 500 | $8.3 | $4.150,00 |
| 1.000 | $7.5 | $7.500,00 |
LTC3884EUK Обзор
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.
Аналоги без доработки для LTC3884EUK — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LTC3884EUK (тот же форм-фактор и посадочное место) — отличается по Function, Package, RoHS Status, Serial Interface.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
LTC3884EUK#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC3884IUK#PBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC3884IUK
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC3884EUK#TRPBF
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
LTC2974IUP#PBF
✅ Прямая замена✓ В наличии
$9.2 / шт.
Открыть даташит →LTC3884EUK Максимальные параметры и электрические характеристики
| Топология | Buck (Step-Down), Synchronous |
| Количество выходов | 2 |
| Выходная конфигурация | Positive |
| Тип выхода | Transistor Driver |
| Функция | Step-Down DC-DC Controller |
| Supply Voltage (Vcc/Vdd) | 4.5 V to 38 V |
| Частота переключения | 200 kHz to 1 MHz |
| Duty Cycle (Max) | 96% |
| Синхронный выпрямитель | Yes |
| Характеристики управления | Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking |
| Serial Interface | I2C / PMBus compliant |
| Current Sensing | Sub-milliohm DCR sensing |
| Рабочая температура | -40C to +125C (junction) |
| Корпус | 48-QFN (7x7 mm) with exposed pad |
| Тип монтажа | Surface Mount |
| Статус RoHS | Compliant (PBF suffix) |
Конфигурация выводов LTC3884EUK
| Контакт 1 | VIN — Main input voltage sense |
| Контакт 2 | VDD33 — Internal 3.3V LDO output |
| Контакт 3 | VDD25 — Internal 2.5V LDO output |
| Контакт 4 | VOUT0 — Channel 0 output voltage sense |
| Контакт 5 | SENSE0+ — Channel 0 DCR sense positive |
| Контакт 6 | SENSE0- — Channel 0 DCR sense negative |
| Контакт 7 | TG0 — Channel 0 top gate driver |
| Контакт 8 | BG0 — Channel 0 bottom gate driver |
| Контакт 9 | SW0 — Channel 0 switching node |
| Контакт 10 | BOOST0 — Channel 0 bootstrap |
| Контакт 11 | PGND0 — Channel 0 power ground |
| Контакт 12 | ITH0 — Channel 0 current loop compensation |
| Контакт 13 | FREQ — Switching frequency setting |
| Контакт 14 | VOUT1 — Channel 1 output voltage sense |
| Контакт 15 | SENSE1+ — Channel 1 DCR sense positive |
| Контакт 16 | SENSE1- — Channel 1 DCR sense negative |
| Контакт 17 | TG1 — Channel 1 top gate driver |
| Контакт 18 | BG1 — Channel 1 bottom gate driver |
| Контакт 19 | SW1 — Channel 1 switching node |
| Контакт 20 | BOOST1 — Channel 1 bootstrap |
| Контакт 21 | PGND1 — Channel 1 power ground |
| Контакт 22 | ITH1 — Channel 1 current loop compensation |
| Контакт 23 | VCC — Supply voltage for gate drivers |
| Контакт 24 | INTVCC — Internal 5V LDO output |
| Контакт 25 | RUN0 — Channel 0 enable (active high) |
| Контакт 26 | RUN1 — Channel 1 enable (active high) |
| Контакт 27 | PGOOD0 — Channel 0 power good |
| Контакт 28 | PGOOD1 — Channel 1 power good |
| Контакт 29 | FAULT — Fault output (open drain) |
| Контакт 30 | ALERT — PMBus alert (open drain) |
| Контакт 31 | SDA — I2C/PMBus data |
| Контакт 32 | SCL — I2C/PMBus clock |
| Контакт 33 | WP — EEPROM write protect |
| Контакт 34 | ASEL — Address select |
| Контакт 35 | SYNC — External clock sync input |
| Контакт 36 | PWM0 — Channel 0 PWM test/debug |
| Контакт 37 | PWM1 — Channel 1 PWM test/debug |
| Контакт 38 | TSNS — Temperature sense |
| Контакт 39 | VDDIO — I/O supply |
| Контакт 40 | NC — Not connected (per datasheet) |
| Контакт 41 | NC — Not connected (per datasheet) |
| Контакт 42 | NC — Not connected (per datasheet) |
| Контакт 43 | NC — Not connected (per datasheet) |
| Контакт 44 | NC — Not connected (per datasheet) |
| Контакт 45 | NC — Not connected (per datasheet) |
| Контакт 46 | NC — Not connected (per datasheet) |
| Контакт 47 | NC — Not connected (per datasheet) |
| Контакт 48 | GND — Signal ground |
Типичное применение
LTC3884EUK подходит для 6 применениеs: 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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
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.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для LTC3884EUK — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | 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 |
Ключевые отличия
- Sub-milliohm DCR current sensing with no external sense resistor (против LTC2974IUP#PBF)
- Dual independent PolyPhase outputs from a single IC (против LTC1923EUH)
- PMBus-compliant digital telemetry with 10-bit ADC (против LTC3310SIV#WPBF)
Заметки по проектированию
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%.
Информация о соответствии
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.
