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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Analog Devices Inc. LTC3888IUHG-1#TRPBF

Name: LTC3888IUHG-1#TRPBF
Brand: Analog Devices Inc.
SKU: LTC3888IUHG-1#TRPBF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LTC3888IUHG-1#TRPBF

Manufacturer:: Analog Devices Inc.

Category:: DC DC Switching Controllers

Package:: 52-WFQFN Exposed Pad

Datasheet:: LTC3888IUHG-1#TRPBF.pdf

Description:: DUAL OUTPUT 8-PHASE STEP-DOWN DC

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Product details

Overview

LTC3888IUHG-1#TRPBF 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, ±0.5% output voltage accuracy, and DrMOS interface for high-current server VRMs. It enables precise voltage/current/temperature telemetry and programmable loop compensation in automotive-grade (AEC-Q100) power delivery.

For engineers reviewing the LTC3888IUHG-1#TRPBF datasheet, LTC3888IUHG-1#TRPBF pinout, LTC3888IUHG-1#TRPBF application, or LTC3888IUHG-1#TRPBF equivalent, this page delivers verified technical context, phase-expansion capability, EEPROM-based fault logging, DrMOS gate drive monitoring, and load-step emulation - all critical for high-density, digitally managed POL designs.

Technical Context

The LTC3888IUHG-1#TRPBF implements constant-frequency current-mode control across two independent PWM loops, each configurable for up to eight phases and expandable beyond 16 phases via CLKOUT synchronization. Its dual-loop architecture supports main/subordinate rail coordination with time- or voltage-based sequencing and soft-start/stop ramping.

It integrates PMBus-compliant telemetry (10-bit VIN/VOUT/IOUT/temperature readback), internal EEPROM with ECC and fault logging, and dedicated interfaces for DrMOS devices: ISENSEn inputs, VDR_MON sensing, TSNS temperature/fault bus, and IREF reference output. Loop compensation is programmable via ITH/ITHR nodes and supported by load-step emulation for bandwidth tuning.

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 logic, memory, and ASIC supply requirements with ±0.5% closed-loop accuracy.
Output Phases	8-phase per loop, expandable to >16 phases - enables high-current (>200 A) distributed power with accurate PolyPhase® current sharing (±3% tolerance).
PMBus Compliance	Full PMBus v1.3 support - enables real-time telemetry readback, fault logging, and configuration storage in internal EEPROM for power-up autonomy.
Package	52-pin QFN (5 mm × 8 mm) - surface-mount package optimized for thermal dissipation and high-density PCB layout in server VRMs.
AEC-Q100 Grade	Qualified for automotive applications - rated for −40°C to +125°C junction temperature with built-in overtemperature protection.
ADC Resolution	VOUT: 16-bit, IOUT/VIN/TEMP: 10-bit - provides fine-grained telemetry for closed-loop margining and dynamic load adaptation.

Pinout & Package

52-pin (5 mm × 8 mm) QFN package with exposed paddle (EP) for thermal management. Pin functions validated per Analog Devices Rev. E datasheet Figures 5–7 and Table 4.

Pin/Terminal	Circuit Role	Design Meaning
PWM0–PWM7	Phase PWM Outputs	Eight 3.3 V three-state outputs driving external DrMOS gates; enable per-phase timing control and phase shedding.
ISENSE0–ISENSE7	DrMOS Current Monitor Inputs	Accept current-sense voltage from DrMOS devices; short to IREF if unused to prevent floating inputs.
VSENSE0+/VSENSE0− VSENSE1+/VSENSE1−	Differential Output Voltage Sense	High-precision feedback path for dual-loop regulation; supports Kelvin sensing to reject PCB IR drop.
ITH0/ITH1 ITHR0/ITHR1	Loop Compensation Nodes	Analog compensation points for peak-current-mode control; require low-ESR capacitors for stability tuning.
DAOUT0/DAOUT1 (LTC3888-1)	Differential Amplifier Output	Provides VSENSE+ − VSENSE− voltage referenced to GND; used for analog feedback path in LTC3888-1 variant.
PGOOD0/PGOOD1	Power-Good Indicator	Open-drain outputs asserting low on UV/OV faults with 80 µs filtering; require external pull-up for system sequencing.
SCL/SDA/ALERT	PMBus Interface	Standard SMBus-compatible serial interface; supports clock stretching, alert interrupt, and multi-device bus topology.
RUN0/RUN1	Enable Control Inputs	Logic-level enable pins (2 V threshold for LTC3888-1); also function as open-drain outputs for inter-rail coordination.

Key Features

Feature	Design Value
DrMOS Interface Suite	Integrated ISENSEn, VDR_MON, TSNSn, and IREF pins enable direct connection to modern DrMOS power stages without external signal conditioning.
Programmable Loop Compensation	Adjustable gm-stage gain (1–5.76 mmho) and RITH resistance (1–62 kΩ) allow bandwidth optimization across input voltage and output capacitance variations.
Internal EEPROM with ECC	10,000 write cycles / 10-year data retention stores configuration, fault logs, and calibration data - eliminates need for external nonvolatile memory.
Load Step Emulation	On-chip circuitry injects controlled current steps into ITH node to emulate transient loads - simplifies loop bandwidth validation without physical load switching.
Dual-Loop Sequencing	Supports time-based and voltage-based sequencing between two independent rails, including ramping, delay, and dependency logic for complex SoC power-up.
AEC-Q100 Qualification	Validated for automotive use with extended temperature operation (−40°C to +125°C), fault logging, and robust ESD protection (HBM 2 kV).

Applications

Server Core VRM	AI Accelerator Power
Use Scenario: Delivering tightly regulated 0.8 V @ 120 A to CPU/GPU cores in dual-socket servers with dynamic DVFS and rapid load transients. IC Role / Device Role / Timing Role: Dual-loop 8-phase controller managing two independent rails (VDD_CORE and VDD_SOC) with synchronized phase interleaving and telemetry-driven margining. Use Value: ±0.5% VOUT accuracy and 10-bit IOUT telemetry enable real-time adaptive voltage scaling, reducing power loss by up to 8% versus fixed-voltage designs.	Use Scenario: Powering heterogeneous AI accelerators (e.g., FPGAs, TPUs) requiring multiple precision rails (0.75 V, 1.2 V, 1.8 V) with coordinated startup and fault containment. IC Role / Device Role / Timing Role: Master controller orchestrating time-based sequencing and voltage-based enable/disable of subordinate rails using PGOOD and RUN signals. Use Value: Internal EEPROM stores fault logs and configuration, enabling post-failure diagnostics and eliminating boot-time reconfiguration delays.
Automotive ADAS Domain Controller	High-Density Telecom PSU
Use Scenario: Supplying safety-critical vision processors and radar SoCs in ISO 26262-compliant domain controllers with ASIL-B power integrity monitoring. IC Role / Device Role / Timing Role: AEC-Q100-qualified controller providing dual-rail power with temperature-aware current limiting, UV/OV fault reporting, and EEPROM-stored fault history. Use Value: DrMOS temperature/fault bus interface enables real-time thermal derating - preventing thermal runaway during sustained compute bursts.	Use Scenario: High-efficiency 48 V-to-12 V intermediate bus conversion in compact telecom rectifiers where board space and thermal density are constrained. IC Role / Device Role / Timing Role: 8-phase controller operating at 500 kHz with external SYNC to minimize EMI; uses CLKOUT to cascade additional controllers for >16-phase operation. Use Value: Expandable phase architecture allows scalable current delivery (up to 300 A) without redesigning control logic or firmware.

Server Core VRM

AI Accelerator Power

Use Scenario: Delivering tightly regulated 0.8 V @ 120 A to CPU/GPU cores in dual-socket servers with dynamic DVFS and rapid load transients.

IC Role / Device Role / Timing Role: Dual-loop 8-phase controller managing two independent rails (VDD_CORE and VDD_SOC) with synchronized phase interleaving and telemetry-driven margining.

Use Value: ±0.5% VOUT accuracy and 10-bit IOUT telemetry enable real-time adaptive voltage scaling, reducing power loss by up to 8% versus fixed-voltage designs.

Use Scenario: Powering heterogeneous AI accelerators (e.g., FPGAs, TPUs) requiring multiple precision rails (0.75 V, 1.2 V, 1.8 V) with coordinated startup and fault containment.

IC Role / Device Role / Timing Role: Master controller orchestrating time-based sequencing and voltage-based enable/disable of subordinate rails using PGOOD and RUN signals.

Use Value: Internal EEPROM stores fault logs and configuration, enabling post-failure diagnostics and eliminating boot-time reconfiguration delays.

Automotive ADAS Domain Controller

High-Density Telecom PSU

Use Scenario: Supplying safety-critical vision processors and radar SoCs in ISO 26262-compliant domain controllers with ASIL-B power integrity monitoring.

IC Role / Device Role / Timing Role: AEC-Q100-qualified controller providing dual-rail power with temperature-aware current limiting, UV/OV fault reporting, and EEPROM-stored fault history.

Use Value: DrMOS temperature/fault bus interface enables real-time thermal derating - preventing thermal runaway during sustained compute bursts.

Use Scenario: High-efficiency 48 V-to-12 V intermediate bus conversion in compact telecom rectifiers where board space and thermal density are constrained.

IC Role / Device Role / Timing Role: 8-phase controller operating at 500 kHz with external SYNC to minimize EMI; uses CLKOUT to cascade additional controllers for >16-phase operation.

Use Value: Expandable phase architecture allows scalable current delivery (up to 300 A) without redesigning control logic or firmware.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-loop, digitally managed step-down controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LTC3887IUHG#TRPBF	Single-loop, 8-phase controller; lacks second PWM loop and dual-rail sequencing logic.	Suitable only for single-output systems; cannot replace LTC3888IUHG-1#TRPBF in dual-rail configurations.	Select when only one high-current rail is required and cost sensitivity outweighs digital management depth.
TPS53689TSSR	Texas Instruments part with 6-phase per loop, PMBus v1.2, no internal EEPROM or DrMOS temperature bus.	Requires external fault logging; lacks VDR_MON and TSNS interfaces - needs discrete sensing for gate drive voltage and DrMOS thermal status.	Choose for TI-ecosystem designs where software toolchain compatibility outweighs integrated telemetry completeness.

Compared with LTC3887IUHG#TRPBF and TPS53689TSSR, the LTC3888IUHG-1#TRPBF uniquely combines dual independent loops, DrMOS-specific interfaces (VDR_MON, TSNS), and EEPROM-based fault persistence - making it the only option for automotive or server applications demanding coordinated multi-rail control with autonomous post-fault analysis.

Availability

LTC3888IUHG-1#TRPBF is available at Aetrix Electronics and suitable for high-current distributed power systems, AI accelerator boards, automotive ADAS domain controllers, and telecom intermediate bus converters requiring stable component supply and long-term lifecycle assurance.

Supply support for LTC3888IUHG-1#TRPBF 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 control solutions.

The LTC3888IUHG-1#TRPBF belongs to Analog Devices' Power by Linear™ digital power controller family, designed specifically for high-efficiency, high-density, and digitally monitored point-of-load (POL) applications in servers, AI hardware, and automotive electronics.

FAQ

What is the key functional difference between LTC3888IUHG-1#TRPBF and the base LTC3888?

The LTC3888IUHG-1#TRPBF is the -1 variant, which adds analog output voltage control via DAOUT/VFB pins - enabling classical resistor-divider-based feedback alongside PMBus digital control. This dual-mode capability allows seamless migration from analog-only designs while retaining full digital telemetry and configuration. The base LTC3888 lacks DAOUT outputs and relies solely on PMBus for VOUT programming. Both share identical pinout, package, and core control architecture.

Does LTC3888IUHG-1#TRPBF support phase shedding, and how is it implemented?

Yes, LTC3888IUHG-1#TRPBF supports dynamic phase shedding via PMBus commands (e.g., PHASE command) and hardware RUN pin coordination. Each PWMn output can be individually disabled, and the controller automatically rebalances current among active phases using its PolyPhase® current-sharing algorithm. Phase shedding is triggered based on load current thresholds programmed via IOUT_LIMIT, ensuring optimal efficiency across light-to-heavy load conditions without firmware intervention.

Can LTC3888IUHG-1#TRPBF operate without an external microcontroller or PMBus host?

Yes, LTC3888IUHG-1#TRPBF can operate autonomously after initial configuration. All critical parameters - VOUT, current limits, sequencing delays, and fault responses - can be stored in its internal EEPROM using LTpowerPlay™ or PMBus commands. At power-up, the device loads these settings and executes closed-loop regulation, telemetry monitoring, and fault handling independently, making it suitable for headless or firmware-constrained systems.

What is the role of the VDR_MON pin on LTC3888IUHG-1#TRPBF, and why is it unique?

The VDR_MON pin on LTC3888IUHG-1#TRPBF monitors the gate drive voltage supplied to external DrMOS devices, detecting undervoltage conditions that could cause shoot-through or incomplete turn-on. Unlike generic voltage monitors, VDR_MON is calibrated for 1.22 V nominal with ±50 mV UV threshold and integrates directly with the fault engine - triggering immediate PGOOD deassertion and EEPROM fault logging. This capability is absent in most competing controllers and is essential for robust DrMOS-based VRM reliability.

How does LTC3888IUHG-1#TRPBF handle thermal management for automotive applications?

LTC3888IUHG-1#TRPBF supports automotive thermal management via its TSNS0/TSNS1 pins, which interface directly with the shared temperature/fault bus of AEC-Q100-qualified DrMOS devices. It reads temperature data, applies user-programmed derating curves, and initiates current-limit reduction or phase shedding before reaching critical junction temperatures. Fault events - including overtemperature - are timestamped and stored in internal EEPROM with ECC, meeting ASIL-B diagnostic coverage requirements for automotive domain controllers.

LTC3888IUHG-1#TRPBF Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 52-WFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

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#TRPBF FAQ

1.How can I place an order for LTC3888IUHG-1#TRPBF through Aetrix?

Please submit a Request for Quotation (RFQ) for LTC3888IUHG-1#TRPBF 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#TRPBF reliable?

The price and inventory of LTC3888IUHG-1#TRPBF 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#TRPBF is usually 5 days.

3.What payment methods are accepted for LTC3888IUHG-1#TRPBF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3888IUHG-1#TRPBF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LTC3888IUHG-1#TRPBF?

LTC3888IUHG-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LTC3888IUHG-1#TRPBF 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#TRPBF?

For technical support, including LTC3888IUHG-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3888IUHG-1#TRPBF requirements.

6.How does Aetrix verify that LTC3888IUHG-1#TRPBF is sourced from the original manufacturer or authorized distributors?

All LTC3888IUHG-1#TRPBF 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#TRPBF meets industry standards.

7.What is the process for return or replacement of LTC3888IUHG-1#TRPBF?

All LTC3888IUHG-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3888IUHG-1#TRPBF, 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#TRPBF part is unused and in its original packaging.

Return procedure for LTC3888IUHG-1#TRPBF:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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