Micrel, Inc.

MIC7401

March 16, 2015

3

Revision 1.0

Table of Contents

General Description ................................................................................................................................................................ 1

Features .................................................................................................................................................................................. 1

Applications ............................................................................................................................................................................. 1

Typical Application .................................................................................................................................................................. 2

Ordering Information ............................................................................................................................................................... 2

Table of Contents .................................................................................................................................................................... 3

List of Figures.......................................................................................................................................................................... 5

List of Tables ........................................................................................................................................................................... 6

Pin Configuration..................................................................................................................................................................... 6

Pin Description ........................................................................................................................................................................ 7

Absolute Maximum Ratings .................................................................................................................................................. 10

Operating Ratings ................................................................................................................................................................. 10

Electrical Characteristics....................................................................................................................................................... 10

Typical Characteristics .......................................................................................................................................................... 15

Functional Characteristics ..................................................................................................................................................... 17

MIC7401 Block Diagram ....................................................................................................................................................... 24

Functional Description........................................................................................................................................................... 25

Programmable Buck Soft-Start Control ............................................................................................................................. 25

Buck Digital Voltage Control (DVC)................................................................................................................................... 26

Programmable Boost Soft-Start Control ............................................................................................................................ 27

Boost Digital Voltage Control (DVC) ................................................................................................................................. 28

Buck Current Limit ............................................................................................................................................................. 28

Boost Current Limit ............................................................................................................................................................ 29

Global Power Good Pin ..................................................................................................................................................... 29

Standard Delay .................................................................................................................................................................. 29

Power-Up Sequencing....................................................................................................................................................... 29

Programmable Power-on-Reset (POR) Delay .................................................................................................................. 30

Power-Down Sequencing .................................................................................................................................................. 30

Stand-By Mode .................................................................................................................................................................. 31

Resistive Discharge ........................................................................................................................................................... 31

STBY Pin ........................................................................................................................................................................... 31

Safe Start-Up into a Pre-Biased Output ............................................................................................................................ 32

Buck Regulator Power Dissipation .................................................................................................................................... 32

Total Power Dissipation ..................................................................................................................................................... 32

Power Derating .................................................................................................................................................................. 33

Overtemperature Fault ...................................................................................................................................................... 33

Input Voltage “Hot-Plug” .................................................................................................................................................... 34

Thermal Measurements..................................................................................................................................................... 34