LTC3888
Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management
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Overview
Features and Benefits
- PMBus/I2C Compliant Serial Interface
- Monitor Voltage, Current, Temperature and Faults
- Digitally Program VOUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing
- Expandable to >16 Phases
- 4.5V ≤ VIN ≤ 26.5V, 0.3V ≤ VOUT ≤ 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
Product Details
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 master/slave configurations. The controller uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM master is capable of producing output voltages from 0.3V to 3.45V 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
Product Categories
Markets and Technologies
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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AN-173: Designing High Phase Count Rails with LTC3888 (Rev. 0)3/9/2021
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AN-166: In Flight Update with Linduino4/10/2017
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AN-155: Fault Log Decoding with Linduino PSM1/26/2017
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AN-153: Linduino for Power System Management12/5/2016
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AN-152: Power System Management Addressing (Rev. A)7/12/2016
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AN-145: Overview of the EEPROM in LTC PSM Devices7/20/2015
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AN-137: Accurate Temperature Sensing with an External P-N Junction9/20/2012
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DC2652A-A - Demo Manual (Rev. 0)10/3/2022
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC3888
LTC3888-1
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3888IUHG#PBF | Material Declaration | Reliability Data | 52-Lead Plastic QFN (5mm × 8mm) | |
| LTC3888IUHG#TRPBF | Material Declaration | Reliability Data | 52-Lead Plastic QFN (5mm × 8mm) | |
| LTC3888IUHG#WPBF | Material Declaration | Reliability Data | 52-Lead Plastic QFN (5mm × 8mm) | |
| LTC3888IUHG#WTRPBF | Material Declaration | Reliability Data | 52-Lead Plastic QFN (5mm × 8mm) | |
| Wafer Fabrication Data |
Support & Discussions
LTC3888 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.