LTC3889

RECOMMENDED FOR NEW DESIGNS

60V Dual Output Step-Down Controller with Digital Power System Management

Data Sheet (Rev. A) Product Selection Table
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Overview

  • PMBus/I2C Compliant Serial Interface
    • Telemetry Read-Back Includes VIN, IIN, VOUT, IOUT, Temperature and Faults
    • Programmable Voltage, Current Limit, Digital Soft-Start/Stop, Sequencing, Margining, OV/UV/OC, Frequency, and Control Loop Compensation
  • Output Error Less Than ±0.5% Over Temperature
  • Integrated 16-Bit ADC and 12-Bit DAC
  • Integrated High Side Current Sense Amplifier
  • Internal EEPROM with ECC and Fault Logging
  • Integrated N-Channel MOSFET Gate Drivers
Power Conversion
  • Wide VIN Range: 5V to 60V
  • VOUT0, VOUT1 Range: 1V to 40V
  • Analog Current Mode Control
  • Accurate PolyPhase® Current Sharing for Up to 6 Phases (85kHz to 500kHz)
  • Available in a 52-Lead (7mm× 8mm) QFN Package

The LTC3889 is a dual PolyPhase DC/DC synchronous step-down switching regulator controller with I2C-based PMBus compliant serial interface. This controller employs a constant-frequency, current-mode architecture, with high voltage input and output capability along with programmable loop compensation. The LTC3889 is supported by the LTpowerPlay™ software development tool with graphical user interface (GUI).

The EXTVCC pin supports voltages up to 14V allowing for optimized circuit efficiency and die temperature, and for the controller output to supply the chip power. Switching frequency, output voltage, and device address can be programmed both by digital interface as well as external configuration resistors. Parameters can be set via the digital interface or stored in EEPROM. Both outputs have an independent power good indicator and FAULT function.

The LTC3889 can be configured for discontinuous (pulse-skipping) mode or continuous inductor current mode.

APPLICATIONS

  • Telecom, Datacom, and Storage Systems
  • Industrial and Point of Load Applications
LTC3889
60V Dual Output Step-Down Controller with Digital Power System Management
LTC3889 Application Circuit LTC3889 Performance Graph LTC3889 Pin Configuration
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Documentation

Data Sheet 1

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Software Resources

Device Drivers 1

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3889

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LTC3889

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

Open Tool
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2595A

LTC3889EUKG 60V Dual Output Step-Down DC/DC Controller with Digital Power System Management

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Product Details

Demonstration circuit 2595A is a high voltage, dual output step-down synchronous buck converter featuring the LTC3889EUKG, a 60V dual-phase current mode controller. The LTC3889 has the PMBus interface and the power system management functions.

The DC2595A uses discrete MOSFET as the power stage. The input range of this board is from 36V to 54V, and the default outputs are 12V/20A (VOUT0) and 24V/20A (VOUT1). DC2595A also has an on-board dynamic load circuit, which makes it easy for the customer to evaluate the transient performances.

Please be aware that the DC2595A default connects VOUT0 (12V) to the LTC3889 EXTVCC pin through R168. As a result, the DRVCC can be adjusted to 6.3V, 7.4V or 9V by setting DRVSET to 0, 1 or 2 in LTpowerPlay®. If you want to adjust VOUT0 to a voltage higher than 12V, R168 must be removed first to avoid damaging the IC.

The DC2595A powers up to default settings and produces power based on configuration resistors or NVM without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter aspects of the LTC3889. To fully explore the extensive power system management features of the parts, download the GUI software LTpowerPlay onto your PC and use LTC’s I2C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.
DC2595A
LTC3889EUKG 60V Dual Output Step-Down DC/DC Controller with Digital Power System Management
DC2595A Evaluation Board DC2595A Evaluation Board - Top View DC2595A Evaluation Board - Bottom View DC2595A_UG-1383 Application Circuit

Latest Discussions

36 Weeks Ago
what is the ambient temperature range
1 Years Ago
I'd like to get the exact answer related to output voltage sensing function of LTC3889
1 Years Ago
LTC3889 PMBUS library / Arduino?
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