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Analog Devices Inc. LTC3888IUHG-2#PBF
- Part No.:
- LTC3888IUHG-2#PBF
- Manufacturer:
- Analog Devices Inc.
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LTC3888IUHG-2#PBF.pdf
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Product details
Overview
LTC3888IUHG-2#PBF from Analog Devices is a dual-loop, 8-phase synchronous step-down DC/DC controller with digital power system management (PMBus/I²C), supporting 4.5 V to 26.5 V input and 0.3 V to 3.45 V output voltage range, ±0.5% output voltage accuracy, and DrMOS interface for high-current server and telecom power rails.
For engineers reviewing the LTC3888IUHG-2#PBF datasheet, LTC3888IUHG-2#PBF pinout, LTC3888IUHG-2#PBF application, or LTC3888IUHG-2#PBF equivalent, this page delivers verified technical context, phase-configurable PWM loop compensation, internal EEPROM fault logging, AEC-Q100 qualification, and DrMOS temperature/fault bus interface - all critical for high-reliability distributed power design.
Technical Context
The LTC3888IUHG-2#PBF implements constant-frequency current-mode control across two independent 4-phase loops, enabling precise polyphase current sharing (±3% accuracy) and fast transient response. It supports both internal and external PWM clocking (250 kHz–1 MHz) and programmable loop compensation via PMBus or external R/C networks on ITH/ITHR pins.
It integrates dual differential amplifiers (DAOUT0/DAOUT1), dedicated DrMOS monitoring interfaces (VDR_MON, TSNS, ISENSE), and a 16-bit VOUT ADC with ±0.2% servo-corrected accuracy. The device uses PMBus v1.3 commands for real-time telemetry readback (VIN, VOUT, IOUT, temperature), fault logging with ECC-protected internal EEPROM, and time- or voltage-based sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 4.5 V to 26.5 V - supports wide-input industrial and automotive supply rails without external pre-regulation |
| VOUT Range | 0.3 V to 3.45 V - covers core, I/O, and memory rail requirements in modern processors and FPGAs |
| Output Accuracy | ±0.5% with servo mode - ensures stable regulation under load/line/temp variation for ASIC/FPGA power domains |
| Phase Count | 8-phase expandable to >16 phases - enables high-current (>200 A) rails with low ripple and thermal spreading |
| Interface | PMBus/I²C compliant - allows full configuration, telemetry, and fault reporting via LTpowerPlay™ GUI or host firmware |
| Package | 52-pin QFN (5 mm × 8 mm) - compact footprint with exposed paddle for enhanced thermal performance in dense PCB layouts |
| AEC-Q100 | Qualified - validated for automotive-grade reliability (Grade 1: –40°C to +125°C TJ) |
Pinout & Package
52-pin (5 mm × 8 mm) QFN package with exposed thermal pad (pin 52 = GND). Pin functions are validated per Analog Devices Rev. E datasheet Figures 5–7 and Table 4.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM0–PWM7 (pins 1,2,5,42,45,46,49,50) | Phase gate drive outputs | 3.3 V three-state PWM signals controlling external DrMOS power stages; open if unused |
| ISENSE0–ISENSE7 (pins 3,4,43,44,47,48,51,52) | DrMOS current monitor inputs | Accepts analog current sense outputs from DrMOS devices; short to IREF if unused |
| VSENSE0+/VSENSE1+ (pins 7,40), VSENSE0−/VSENSE1− (pins 6,41) | Differential output voltage sensing | Enables accurate remote sensing of dual output rails; short + to − if unused |
| TSNS0/TSNS1 (pins 8,39) | DrMOS temperature/fault bus | Monitors shared thermal/fault status from DrMOS modules; requires pull-up per application note |
| ITH0/ITH1, ITHR0/ITHR1 (pins 9,38,10,37) | Loop compensation nodes | Connect low-ESR capacitors to GND for custom current-mode loop tuning per channel |
| SCL/SDA (pins 15,16), ALERT (pin 17) | PMBus interface | Supports standard SMBus timing (10–400 kHz); requires external pull-ups to VDD33 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-phase control | Enables two fully configurable, isolated power rails (e.g., CPU core + SoC I/O) with independent sequencing and fault handling |
| Internal EEPROM with ECC | Stores configuration, fault logs, and calibration data across power cycles; 10,000 write cycles, 10-year retention at ≤125°C |
| DrMOS-specific monitoring | Direct interface to VDR_MON (gate drive voltage), TSNS (temperature/fault bus), and ISENSE (current monitor) simplifies high-efficiency power stage integration |
| Load step emulation | Allows bandwidth optimization during design by simulating dynamic load transients without physical hardware changes |
| Programmable PWM loop compensation | Adjusts loop dynamics via PMBus or external R/C on ITH/ITHR pins - eliminates manual compensation redesign for different output caps or loads |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood applications requiring operation from –40°C to +125°C junction temperature |
Applications
| Server Core Voltage Regulation | Automotive ADAS Power Management |
|---|---|
Use Scenario: Regulating 0.8 V/120 A CPU core rail in 1U rack servers with tight transient response and telemetry. IC Role / Device Role / Timing Role: Dual-loop 8-phase controller managing parallel DrMOS stages, providing real-time current/voltage/temperature telemetry via PMBus. Use Value: ±0.5% VOUT accuracy and ±3% current sharing ensure stable operation under rapid load steps; internal EEPROM retains fault logs for field failure analysis. |
Use Scenario: Powering radar SoCs and image signal processors in autonomous driving ECUs with functional safety requirements. IC Role / Device Role / Timing Role: AEC-Q100-qualified dual-rail controller delivering sequenced 1.0 V and 1.8 V supplies with voltage-based startup and fault propagation across channels. Use Value: Integrated FAULT0/FAULT1 pins enable inter-rail fault coordination; TSNS/DrMOS monitoring supports ISO 26262 ASIL-B diagnostics coverage. |
| Network Switch ASIC Supply | High-Density Storage Controller Rail |
Use Scenario: Generating 1.2 V/80 A supply for multi-core network processors in 100G Ethernet switches. IC Role / Device Role / Timing Role: 8-phase controller with expandable topology (>16 phases) and programmable soft-start/sequencing to meet IEEE 802.3bt inrush limits. Use Value: Load step emulation validates loop stability before hardware spin; PMBus readback enables dynamic margining during system validation. |
Use Scenario: Delivering tightly regulated 0.95 V/60 A supply to NVMe SSD controllers in enterprise storage arrays. IC Role / Device Role / Timing Role: Dual-loop controller operating in main/subordinate configuration to coordinate voltage ramp rates and UV/OV thresholds across redundant rails. Use Value: Internal EEPROM stores calibrated VOUT settings and fault history, enabling predictive maintenance and BOM continuity across production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-loop multiphase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3887IUHG#PBF | Single-loop 8-phase controller; lacks second independent control loop and DAOUT outputs | Suitable only for single-rail systems; cannot replace dual-rail sequencing or independent fault handling | Select when only one high-current rail is needed and cost reduction is prioritized over dual-loop flexibility |
| MP2975AGQ-PR | PMBus 1.3-compliant dual-loop 6-phase controller; no DrMOS temperature/fault bus interface or VDR_MON pin | Requires external circuitry for gate drive voltage monitoring; limited to 6 phases without expansion | Choose for cost-sensitive telecom applications where 6-phase capability and basic telemetry suffice |
Compared with LTC3887IUHG#PBF and MP2975AGQ-PR, the LTC3888IUHG-2#PBF uniquely delivers dual independent 4-phase loops with integrated DrMOS-specific monitoring (TSNS, VDR_MON), AEC-Q100 qualification, and EEPROM-based fault logging - making it the only option for automotive ADAS or dual-rail server designs requiring coordinated sequencing and comprehensive telemetry.
Availability
LTC3888IUHG-2#PBF is available at Aetrix Electronics and suitable for server power delivery, automotive ADAS domain controllers, and high-density network equipment requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LTC3888IUHG-2#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and connectivity solutions.
The LTC3888 family was designed specifically for digitally managed, high-current multiphase DC/DC conversion in mission-critical infrastructure - emphasizing PMBus configurability, DrMOS interoperability, and automotive-grade reliability.
FAQ
What is the key functional difference between LTC3888IUHG-2#PBF and LTC3888-1 variants?
The LTC3888IUHG-2#PBF supports analog output voltage control via resistor dividers on VFB pins and includes AVS (adaptive voltage scaling) capability, while the LTC3888-1 adds SPI interface and differential amplifier outputs (DAOUT) for analog feedback paths. Both share identical pinout, 8-phase architecture, PMBus functionality, and AEC-Q100 qualification. The -2 variant prioritizes simplicity and analog-programmable margins; the -1 adds flexibility for hybrid analog/digital control schemes.
Does LTC3888IUHG-2#PBF support phase shedding or DCM operation?
No, the LTC3888IUHG-2#PBF operates exclusively in continuous conduction mode (CCM) with fixed-phase or polyphase current sharing. It does not implement automatic phase shedding, diode emulation, or discontinuous conduction mode (DCM) control. Phase count is statically configured via PMBus or resistor programming; dynamic phase reduction is not supported in this variant.
Can LTC3888IUHG-2#PBF be used without PMBus communication?
Yes. LTC3888IUHG-2#PBF supports full analog configuration using external resistors for VOUT setpoint, UV/OV thresholds, current limit, and soft-start timing. PMBus is optional for runtime telemetry, fault logging, and dynamic reconfiguration. Default startup behavior uses factory-stored EEPROM values or resistor-programmed defaults if PMBus is unconnected.
What thermal management features does LTC3888IUHG-2#PBF provide?
LTC3888IUHG-2#PBF integrates dual TSNS inputs for direct connection to DrMOS temperature/fault buses, supports external NTC thermistors via dedicated pins, and includes internal die temperature monitoring with PMBus readback (10-bit resolution, ±1.5°C error). It also provides overtemperature shutdown with hysteresis and thermal derating guidance for EEPROM retention above 125°C junction temperature.
Is LTC3888IUHG-2#PBF pin-compatible with earlier LTC388x generations?
No. LTC3888IUHG-2#PBF is not pin-compatible with LTC3880, LTC3882, or LTC3884 due to differences in pin count (52 vs. 40/48), function allocation (e.g., dedicated TSNS/DAOUT/VDR_MON pins), and package size (5 mm × 8 mm QFN). Migration requires PCB layout revision and firmware updates to accommodate expanded PMBus command set and dual-loop register mapping.
LTC3888IUHG-2#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
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- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
LTC3888IUHG-2#PBF FAQ
1.How can I place an order for LTC3888IUHG-2#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3888IUHG-2#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 LTC3888IUHG-2#PBF reliable?
The price and inventory of LTC3888IUHG-2#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3888IUHG-2#PBF is usually 5 days.
3.What payment methods are accepted for LTC3888IUHG-2#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3888IUHG-2#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3888IUHG-2#PBF?
LTC3888IUHG-2#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3888IUHG-2#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 LTC3888IUHG-2#PBF?
For technical support, including LTC3888IUHG-2#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3888IUHG-2#PBF requirements.
6.How does Aetrix verify that LTC3888IUHG-2#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3888IUHG-2#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 LTC3888IUHG-2#PBF meets industry standards.
7.What is the process for return or replacement of LTC3888IUHG-2#PBF?
All LTC3888IUHG-2#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3888IUHG-2#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 LTC3888IUHG-2#PBF part is unused and in its original packaging.
Return procedure for LTC3888IUHG-2#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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