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Sida 1/25

LX7219

Datasheet

6A Hysteretic Synchronous Buck Regulator with I2C

Production

July 2018

6A Hysteretic Synchronous Buck Regulator with I2C Production

Microsemi Proprietary and Confidential. LX7219 Datasheet Revision 2.0

Contents

1 Revision History ............................................................................................................................. 1

1.1 Revision 2.0 ........................................................................................................................................

1.2 Revisions Prior to 2.0 ..........................................................................................................................

2 LX7219 Overview ........................................................................................................................... 2

2.1 Features ..............................................................................................................................................

2.2 Applications ........................................................................................................................................

3 Pin/Ball Configuration .................................................................................................................... 4

3.1 Ordering Information ......................................................................................................................... 4

3.2 Pin/Ball Description ............................................................................................................................

3.3 Functional Block Diagram ................................................................................................................... 6

4 Electrical Specifications .................................................................................................................. 7

4.1 Absolute Maximum Ratings ................................................................................................................ 7

4.2 Electrical Characteristics ..................................................................................................................... 7

4.2.1 Operating Ratings .................................................................................................................................... 7

4.2.2 Typical Electrical Characteristics ............................................................................................................. 7

4.2.3 Thermal Properties .................................................................................................................................. 9

4.2.4 Application Specifications ....................................................................................................................... 9

4.3 I2C Timing Specifications .................................................................................................................. 10

5 Operation Theory ......................................................................................................................... 11

5.1 Basic Operation ................................................................................................................................ 1

5.2 Setting the Output Voltage ............................................................................................................... 11

5.3 Startup .............................................................................................................................................. 1

5.4 Over Current Protection ................................................................................................................... 1

5.5 Positive Voltage Transitions ............................................................................................................. 12

5.6 Negative Voltage Transitions ............................................................................................................ 13

5.7 Enabling Regulator from I2C Bus ...................................................................................................... 13

5.8 Switch Node Rise Rate Adjustment .................................................................................................. 13

6 I2C Interface ................................................................................................................................. 14

6.1 I2C Port Functional Description ........................................................................................................ 14

6.2 I2C Port Description .......................................................................................................................... 14

6.3 Register Map .................................................................................................................................... 1

6.4 Slave Address .................................................................................................................................... 1

6.5 Start and Stop Commands ................................................................................................................ 14

6.6 Data Transfers .................................................................................................................................. 1

6.6.1 Data Transfer Timing for Write Commands .......................................................................................... 15

6.7 I2C Electrical Characteristics ............................................................................................................. 15