LTC3888-2

PRE-RELEASE

Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management

Data Sheet (Rev. E) Product Selection Table

Part Models: 4
1ku List Price: Starting From $6.70

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Overview

PMBus/I²C Compliant Serial Interface
- Monitor Voltage, Current, Temperature and Faults
- Digitally Program V_OUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing
Expandable to >16 Phases
4.5V ≤ V_IN ≤ 26.5V, 0.3V ≤ V_OUT ≤ 3.45V
±0.5% Output Voltage Accuracy
Programmable PWM Loop Compensation
Accurate PolyPhase^® Current Sharing

Internal EEPROM with ECC and Fault Logging
DrMOS Output Current Monitor Interface
DrMOS Temperature/Fault Bus Interface
DrMOS Gate Drive Supply Monitor
Load Step Emulation
Internal or External PWM Clock from 250kHz to 1MHz
52-Pin (5mm × 8mm) QFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC3888/LTC3888-1/LTC3888-2 is a PMBus-compliant dual loop DC/DC synchronous step-down switching regulator controller with eight expandable phases supporting a wide range of main/subordinate configurations. The controller uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM main is capable of producing output voltages from 0.3 V to 3.45 V with multiple phase configurations using DrMOS devices that provide an output current monitor.

PMBus configuration and monitoring is supported by LTpowerPlay^™ software. Programmable loop compensation and built-in load step emulation facilitate setting bandwidth based on input voltage and output load capacitance. PMBus commands allow read back of input voltage, output voltage and current, and operating status. Operating parameters can be set via PMBus command or stored in internal EEPROM for use at power up. Switching frequency, phase configuration, output voltage (LTC3888/LTC3888-2), output current limit (LTC3888-1) and device address can also be set using external programming resistors.

APPLICATIONS

High Current Distributed Power Systems
Servers, Network and Storage Equipment

Part Models: 4
1ku List Price: Starting From $6.70

Documentation

Data Sheet 1

LTC3888/LTC3888-1/LTC3888-2: Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management Data Sheet (Rev.E) 10/27/2023
- PSM PMBUS Errata (Rev 0)

Application Note 6

AN-137: Accurate Temperature Sensing with an External P-N Junction 09/20/2012

AN-152: Power System Management Addressing (Rev.A) 07/12/2016

AN-145: Overview of the EEPROM in LTC PSM Devices 07/20/2015

AN-153: Linduino for Power System Management 12/05/2016

AN-166: In Flight Update with Linduino 04/10/2017

AN-155: Fault Log Decoding with Linduino PSM 01/26/2017

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC3888IUHG-2#PBF	52-Lead Plastic QFN (5mm × 8mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3888IUHG-2#TRPBF	52-Lead Plastic QFN (5mm × 8mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3888IUHG-2#WPBF	52-Lead Plastic QFN (5mm × 8mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3888IUHG-2#WTRPBF	52-Lead Plastic QFN (5mm × 8mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3888
LTC3888-1

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTC3888-1

IBIS Model 1

LTC3888x IBIS Model

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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