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Analog Devices Inc. LTC3888IUHG-1#PBF
- Part No.:
- LTC3888IUHG-1#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 52-WFQFN Exposed Pad
- Datasheet:
-
LTC3888IUHG-1#PBF.pdf
- Description:
- DUAL OUTPUT 8-PHASE STEP-DOWN DC
- Quantity:
- Payment:
- Shipping:
Inventory:3,634
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Product details
Overview
LTC3888IUHG-1#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 AEC-Q100 qualification for automotive high-current power rails.
For engineers reviewing the LTC3888IUHG-1#PBF datasheet, LTC3888IUHG-1#PBF pinout, LTC3888IUHG-1#PBF application, or LTC3888IUHG-1#PBF equivalent, key selection criteria include its dual-loop 8-phase architecture, DrMOS interface support, internal EEPROM with ECC and fault logging, programmable PWM loop compensation, and expandability beyond 16 phases in multi-controller configurations.
Technical Context
The LTC3888IUHG-1#PBF implements constant-frequency current-mode control per phase with independent main/subordinate loop configuration, enabling precise polyphase current sharing (±3% accuracy) and fast transient response. Its dual-loop structure supports independent regulation of two output rails-each configurable as main or subordinate-with dedicated VSENSE+/VSENSE− differential sensing and ITH/ITHR compensation nodes.
It integrates PMBus v1.3-compliant serial interface for real-time telemetry (VIN, VOUT, IOUT, temperature), fault monitoring, and full digital configuration-including VOUT, UV/OV limits, current limit, soft-start/stop, sequencing, and switching frequency (250 kHz–1 MHz). Internal EEPROM stores settings with CRC/ECC protection and enables autonomous startup without host intervention.
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 including 12 V and 24 V systems. |
| VOUT Range | 0.3 V to 3.45 V - covers core logic, memory, FPGA, and ASIC supply requirements with fine-grained digital adjustment. |
| Output Accuracy | ±0.5% with servo mode - ensures stable voltage under load/line/temp variation without external trimming. |
| Phases | 8-phase base, expandable to >16 phases - enables high-current (>200 A) rails with low ripple and thermal spreading. |
| PMBus Interface | Compliant with PMBus v1.3 - allows standardized readback, configuration, and fault logging via LTpowerPlay™ or custom firmware. |
| EEPROM | 10,000 write cycles / 10-year retention at ≤125°C - retains critical configuration and fault logs across power cycles and field updates. |
| AEC-Q100 | Qualified Grade 1 (–40°C to +125°C TJ) - validated for automotive under-hood and ADAS power applications. |
Pinout & Package
Package: 52-pin (5 mm × 8 mm) QFN with exposed paddle (UHG package code), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM0–PWM7 (Pins 1,2,5,42,45,46,49,50) | Phase gate drive outputs | Eight 3.3 V three-state PWM signals driving external DrMOS or discrete FETs; each independently controllable and phase-shifted. |
| ISENSE0–ISENSE7 (Pins 3,4,43,44,47,48,51,52) | DrMOS current monitor inputs | Accepts analog current-sense outputs from DrMOS devices; enables accurate per-phase current measurement and sharing. |
| VSENSE0+/VSENSE0−, VSENSE1+/VSENSE1− (Pins 6–7,39–40) | Differential output voltage sense | High-precision remote sensing for two independent rails; rejects noise and PCB IR drop for tight regulation. |
| ITH0/ITH1, ITHR0/ITHR1 (Pins 9–10,37–38) | Loop compensation nodes | Analog error amplifier compensation points; external RC networks set bandwidth and stability per loop. |
| PGOOD0/PGOOD1 (Pins 11,36) | Power-good status outputs | Open-drain indicators with 80 µs filtering - assert low on UV/OV faults; require external pull-up for system sequencing. |
| SCL/SDA/ALERT/FAULT0/FAULT1/RUN0/RUN1 (Pins 15–16,17,18–19,20–21) | Digital control & status I/O | Support PMBus communication, fault propagation, run enable, and system-level interrupt signaling with configurable thresholds. |
Key Features
| Feature | Design Value |
|---|---|
| DrMOS interface integration | Direct connection to DrMOS temperature/fault bus and gate drive monitor (VDR_MON), eliminating need for external isolation or level-shifting. |
| Load step emulation | On-chip circuitry simulates rapid load transients to validate loop stability and optimize compensation without physical load changes. |
| Programmable PWM loop compensation | Configurable zero/pole placement via external R/C on ITH/ITHR pins - enables bandwidth tuning across input voltage and output capacitance variations. |
| Internal EEPROM with ECC | Stores full configuration, fault logs, and telemetry history; ECC prevents silent corruption during automotive vibration or EMI exposure. |
| PolyPhase® current sharing | Accurate ±3% phase-to-phase current matching using ISENSE feedback - reduces thermal stress and improves efficiency in multi-phase designs. |
Applications
| Server VR13/VR14 CPU Core Rail | Automotive ADAS Domain Controller Power |
|---|---|
Use Scenario: High-current, dynamically scaled CPU core supply in dual-socket server platforms requiring strict voltage tolerance and telemetry-driven thermal management. IC Role / Device Role / Timing Role: Dual-loop 8-phase controller managing two independent VDD/VDDQ rails with PMBus-based margining, sequencing, and real-time current/voltage readback. Use Value: Enables compliance with VR13/VR14 specifications including ±0.5% accuracy, <100 ns soft-start delay, and seamless transition between active/idle states via digital commands. | Use Scenario: Power delivery for radar, camera, and AI accelerator modules in ISO 26262-compliant ADAS ECUs operating in harsh under-hood environments. IC Role / Device Role / Timing Role: AEC-Q100 qualified digital controller delivering fault-tolerant 1.8 V and 1.0 V rails with EEPROM-stored fail-safe defaults and DrMOS temperature-aware throttling. Use Value: Provides automotive-grade reliability with internal fault logging, overtemperature shutdown coordination, and no-host-required startup after reset or brownout. |
| Network Switch ASIC Supply | Industrial FPGA Power Management |
Use Scenario: Multi-rail power for high-density 100G/400G switch ASICs requiring precise sequencing, dynamic voltage scaling, and per-rail telemetry for predictive maintenance. IC Role / Device Role / Timing Role: Configured as master/subordinate pair controlling 12 V → 0.85 V and 12 V → 1.2 V rails with time-based sequencing and voltage-based ramping. Use Value: Reduces BOM count by integrating sequencing, monitoring, and compensation into single IC; eliminates external DACs, supervisors, and ADCs. | Use Scenario: Reconfigurable power for Xilinx Versal or Intel Agilex FPGAs where rail voltages change between boot, configuration, and runtime modes. IC Role / Device Role / Timing Role: Digital controller storing multiple VOUT profiles in EEPROM and executing on-the-fly voltage transitions via PMBus commands. Use Value: Supports FPGA partial reconfiguration with sub-millisecond voltage slewing and synchronized rail ramping to avoid configuration errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-loop multi-phase controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3887IUHG#PBF | Single-loop 8-phase controller; lacks second independent control loop and subordinate rail capability. | Suitable only for single-output high-current rails; cannot manage dual-rail sequencing or independent margining. | Select when only one regulated output is required and cost sensitivity outweighs dual-loop flexibility. |
| MP2960AGQ-10-Z | 6-phase PMBus controller with integrated MOSFET drivers; no DrMOS temperature/fault bus interface or EEPROM fault logging. | Targeted at cost-sensitive telecom/datacom; limited to 6 phases and lacks AEC-Q100 qualification. | Choose for space-constrained non-automotive applications where integrated drivers reduce component count but advanced diagnostics are optional. |
Compared with LTC3887IUHG#PBF and MP2960AGQ-10-Z, the LTC3888IUHG-1#PBF uniquely delivers dual independent loops, AEC-Q100 qualification, DrMOS bus integration, and EEPROM-based fault resilience - making it the only option for safety-critical dual-rail automotive or high-availability server power systems.
Availability
LTC3888IUHG-1#PBF is available at Aetrix Electronics and suitable for server VR13/VR14 CPU core rails, automotive ADAS domain controllers, and network switch ASIC supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3888IUHG-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3888 product line delivers digitally managed multi-phase DC/DC controllers for mission-critical power systems demanding precision regulation, comprehensive telemetry, and automotive-grade reliability.
FAQ
What is the primary function of the LTC3888IUHG-1#PBF in a power system?
The LTC3888IUHG-1#PBF serves as a dual-loop, 8-phase synchronous step-down DC/DC controller with integrated digital power system management. It regulates two independent output rails-each with programmable voltage, current limits, sequencing, and telemetry-using PMBus/I²C. The LTC3888IUHG-1#PBF replaces discrete analog controllers and monitoring ICs by embedding loop compensation, fault logging, EEPROM storage, and DrMOS interface logic into a single QFN package.
Does the LTC3888IUHG-1#PBF support AEC-Q100 qualification, and what grade does it meet?
Yes, the LTC3888IUHG-1#PBF is AEC-Q100 qualified for automotive applications and meets Grade 1 specifications (–40°C to +125°C junction temperature). This qualification covers stress testing for temperature cycling, humidity, mechanical shock, and ESD, ensuring suitability for under-hood ADAS domain controllers and infotainment power supplies where reliability under thermal and vibration stress is mandatory. The LTC3888IUHG-1#PBF maintains full functionality across this range with guaranteed EEPROM retention and fault logging integrity.
How does the LTC3888IUHG-1#PBF implement polyphase current sharing, and what accuracy is achieved?
The LTC3888IUHG-1#PBF achieves polyphase current sharing by measuring per-phase current via ISENSEn inputs from DrMOS devices and dynamically adjusting PWM duty cycles to equalize current across all active phases. It guarantees ±3% phase-to-phase current sharing accuracy when ISENSEn – IREF ≥ 150 mV, verified across temperature and load conditions. This precision minimizes thermal imbalance and maximizes efficiency in high-current applications such as CPU VRs. The LTC3888IUHG-1#PBF also supports expansion beyond 8 phases using CLKOUT and SHARE_CLOCK for inter-device synchronization.
Can the LTC3888IUHG-1#PBF operate without a host microcontroller, and how is configuration retained?
Yes, the LTC3888IUHG-1#PBF can operate autonomously without a host microcontroller. All critical configuration parameters-including VOUT, UV/OV limits, current limits, soft-start timing, and phase assignment-are stored in its internal EEPROM with ECC protection. At power-up, the LTC3888IUHG-1#PBF loads these settings automatically, enabling fully self-contained operation. Configuration updates can be performed via PMBus or external resistors, and EEPROM endurance is rated for 10,000 write cycles with 10-year data retention at ≤125°C junction temperature.
What interfaces does the LTC3888IUHG-1#PBF provide for connecting to DrMOS power stages?
The LTC3888IUHG-1#PBF provides four dedicated DrMOS interfaces: (1) eight ISENSEn pins for per-phase current monitor inputs, (2) TSNS0/TSNS1 for shared temperature/fault bus connection, (3) VDR_MON for gate drive voltage monitoring, and (4) PGOOD0/PGOOD1 open-drain outputs for rail status indication. These interfaces eliminate external level shifters or isolators, enabling direct, robust communication with compatible DrMOS devices such as the LTC7051 or TDA21470. The LTC3888IUHG-1#PBF interprets DrMOS fault signals and integrates them into its unified fault-handling and logging system.
LTC3888IUHG-1#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 2
- Output Phases:
- 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 26.5V
- Frequency - Switching:
- 250kHz ~ 1MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus
- Control Features:
- Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-QFN (5x8)
LTC3888IUHG-1#PBF FAQ
1.How can I place an order for LTC3888IUHG-1#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3888IUHG-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 LTC3888IUHG-1#PBF reliable?
The price and inventory of LTC3888IUHG-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 LTC3888IUHG-1#PBF is usually 5 days.
3.What payment methods are accepted for LTC3888IUHG-1#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3888IUHG-1#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3888IUHG-1#PBF?
LTC3888IUHG-1#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3888IUHG-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 LTC3888IUHG-1#PBF?
For technical support, including LTC3888IUHG-1#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3888IUHG-1#PBF requirements.
6.How does Aetrix verify that LTC3888IUHG-1#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3888IUHG-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 LTC3888IUHG-1#PBF meets industry standards.
7.What is the process for return or replacement of LTC3888IUHG-1#PBF?
All LTC3888IUHG-1#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3888IUHG-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 LTC3888IUHG-1#PBF part is unused and in its original packaging.
Return procedure for LTC3888IUHG-1#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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