LTC7106

A 7-Bit Current DAC with PMBus Interface

Data Sheet

Rev. A

Recommended for New Designs

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Overview

Features and Benefits
Product Details

Features and Benefits

±0.8% I_DAC Positive Output Current Accuracy (Over Temp)
±1.5% I_DAC Negative Output Current Accuracy (Over Temp)
PMBus/I²C Compliant Serial Interface
Input Voltage Range: 2.5V to 5.5V
High Impedance at I_DAC Output When Disabled
Wide I_DAC Operation Voltage (0.4V to 2.0V)
7-Bit Programmable DAC Output Current for DC/DC V_OUT Control
Wide Range I_DAC Output Current: ±16μA to ±256μA
Programmable Slew Rate: 500ns ~ 3ms per Bit
Available in a 10-Lead (3mm × 2mm) DFN Package

Product Details

The LTC7106 is a precision, PMBus controlled, bidirectional current digital-to-analog converter that adjusts the output voltage of any conventional V_FB referenced regulator. The LTC7106 can work with the vast majority of power management controllers or regulators to enable digital control of the output voltage. Internal power-on reset circuitry keeps the DAC output current at zero (high impedance IDAC) until a valid write takes place. Features include a range bit for easy interfacing to almost any impedance resistor divider, and an open-drain GPO output for controlling the Run or Enable pin of the DC/DC regulator. For most applications, the current DAC error is significantly attenuated with proper design. See more detail about V_OUT accuracy in the Applications Information section of this data sheet. The LTC7106 is supported by the ADI LTpowerPlay^® development tool with graphical user interface (GUI).

Applications

General Purpose Power Systems
Telecom Systems
Industrial Applications

Product Categories

Power Monitor, Control, & Protection
- Digital Power System Managers
- Margining Controllers

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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 (2)

DC2830A

LTC7106 and LTM4636 Demo Board | 7-Bit DAC with PMBus Controlled Step-Down μModule Regulator

DC2620A

LTC7106 A 7-Bit Current DAC with Digital PMBus Interface

DC2830A

View Detailed Evaluation Kit Information

Demonstration circuit 2830A features the LTM4636EY, a 40A high efficiency, switch mode step-down µModule^® regulator which is controlled by the LTC7106EDDB, a precision, bidirectional, 7-Bit current DAC with PMBus interface. The LTC7106 is used to adjust the output voltage of the LTM4636 by way of the PMBus. The LTM4636’s input voltage range is from 4.7V to 15V and the output voltage range is from 0.6V to 3.3V. De-rating is necessary for certain VIN, VOUT, frequency and thermal conditions. The LTC7106 requires an input voltage from 2.5V to 5.5V and on DC2830A it’s powered directly from the DC1613A dongle. The LTC7106 provides three ranges of IDAC output current: Nominal Range (–64µA to 63µA), Range High (–256µA to 252µA) and Range Low (–16µA to 15.75µA). The nominal range is optimized with the highest accuracy. It is recommended that users design the resistor divider using the nominal range of the IDAC setting.

To explore the power system management features of the LTC7106, download the GUI software LTpowerPlay^® onto your PC and use ADI’s I²C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly, view IDAC current value and fault status.

The LTM4636 and LTC7106 data sheets must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2830A.

Resources

DC2620A

View Detailed Evaluation Kit Information

Demonstration circuit 2620A-A uses the LTC7106, a precision, bidirectional, 7-Bit current DAC with PMBus interface and can be used to adjust the output voltage of any conventional V_FB referenced regulator. The LTC7106 can work with the vast majority of power management controllers, regulators or modules to enable digital control of the output voltage.

The DC2620A-A requires input voltage range from 2.5V to 5.5V, which can be powered either by external supply or directly from the DC1613A dongle. The LTC7106 provides three ranges of IDAC output current: Nominal Range (–64µA to 63µA), Range High (–256µA to 252µA) and Range Low (–16µA to 15.75µA). Only the nominal range is optimized with the highest accuracy. It is recommended that users design the resistor divider using the nominal range of the IDAC setting.

To explore the power system management features of the parts, download the GUI software LTpowerPlay onto your PC and use ADI’s I²C/SMBus/PMBus Dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly, view IDAC current value and fault status.

Resources

Documentation

Data Sheets (1)

PDF

1.66 M

LTC7106: A 7-Bit Current DAC with PMBus Interface Data Sheet (Rev. A)

User Guides (2)

PDF

740.62 K

DC2830A - Demo Manual (Rev. 0)

PDF

1.00M

DC2620A - Demo Board Manual (Rev. B)

Demo Board Schematic (1)

PDF

35.08 K

DC2830A - Schematic

Product Recommendations

LTC7106 Companion Parts

Recommended Related Parts

LTC2975.

Reference Materials

View All (1)
Press Releases (1)

Press Releases (1)

Control VOUT of Any DC/DC Regulator with a Serial PMBus Interface

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.

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Support & Discussions

LTC7106 Discussions

RE: ADP7159..ADM7155 REF_SENSE pin

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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.

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